CN215619818U - Anti-collision structure for injection mold - Google Patents

Abstract

The utility model discloses an anti-collision structure for an injection mold, which comprises a movable mold plate, a fixed mold plate and an ejector pin, wherein a first travel switch, a second travel switch and a bottom plate are installed at the rear part of the movable mold plate, a slide block is installed at the front end of the movable mold plate, a positioning groove is formed in the rear end of the fixed mold plate, the anti-collision structure comprises an anti-collision rod, the anti-collision rod is vertically fixed at the front end of the bottom plate and is opposite to the slide block, a safety hole matched with the anti-collision rod is formed in the slide block, after the mold is opened, when the slide block moves back to a specified position, the safety hole is opposite to the anti-collision rod, at the moment, a push rod of the injection mold can push the bottom plate forwards, and an injection product is ejected through the ejector pin. This anticollision structure's simple structure, practicality can ensure injection moulding product's ejecting process safety, reliable, simultaneously, after first travel switch and second travel switch because of electronic fault or short circuit condition problem appear, can effectively prevent the compound die of fixed die plate and movable mould board to the thimble is hit absolutely and the front and back die cavity is crushed when the prevention is improper compound die.

Description

Anti-collision structure for injection mold

Technical Field

The utility model relates to an anti-collision and mistake-proofing structure for an automobile part production mold, in particular to an anti-collision structure for an injection mold.

Background

The slide block core pulling type injection mold is a common tool mold in the production of automobile parts, generally comprises a movable mold plate, a fixed mold plate, an ejector pin, a slide block and other parts, and limits the position or the stroke of mechanical movement of the ejector pin through a stroke switch so that the ejector pin automatically moves back and forth or stops automatically according to a certain position or stroke. When the travel switch has an electronic fault or a short circuit, an error signal can be given, and if the movable mould plate and the fixed mould plate still carry out mould closing and mould locking at the moment, the ejector pin is easy to damage, and the injection production is adversely affected.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an anti-collision structure for an injection mold, which is simple and practical in structure and can improve the injection safety, aiming at the defects of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: an anti-collision structure for an injection mold comprises a movable mold plate, a fixed mold plate and an ejector pin, wherein a first travel switch, a second travel switch and a bottom plate are installed at the rear part of the movable mold plate, the bottom plate can move back and forth under the driving of a push rod of the injection mold, the first travel switch and the second travel switch are respectively arranged at two limit positions of the travel of the bottom plate in a front-back mode, the ejector pin is vertically fixed at the front end of the bottom plate, a slide block capable of moving left and right is installed at the front end of the movable mold plate, a positioning groove matched with the front end of the slide block is formed in the rear end of the fixed mold plate, after the fixed mold plate and the movable mold plate are assembled, the front end of the slide block is completely embedded into the positioning groove, and the fixed mold plate and the front and rear mold cavities of the movable mold plate enclose a mold cavity for accommodating injection products, the anti-collision structure comprises an anti-collision rod, wherein the anti-collision rod is vertically fixed at the front end of the bottom plate, the anti-collision rod is opposite to the slide block, a safety hole matched with the anti-collision rod is formed in the slide block, after the mold is opened, when the slide block moves back to a specified position, the safety hole is right opposite to the anti-collision rod, the push rod of the injection mold can push the bottom plate forwards, and an injection product is ejected out through the ejector pin.

After the anti-collision structure is arranged on the injection mold, the injection molding operation can be carried out under the normal mold closing state, and after the injection molding is finished, the corresponding operation flows and steps of each part are as follows: 1) the fixed template is kept still, and the movable template horizontally moves backwards to a specified position; 2) the slide block retreats to the position where the safety hole of the slide block is over against the anti-collision rod; 3) a push rod of the injection mold pushes the bottom plate forwards, the ejector pin and the anti-collision rod move forwards synchronously along with the bottom plate until the ejector pin ejects the injection product and the front end of the anti-collision rod penetrates into the safety hole, and the injection product is taken out manually; 4) the injection mold enters a circulating operation, the first travel switch and the second travel switch send signals, a push rod of the injection mold drives the bottom plate, the ejector pin and the anti-collision rod to reset, and the first travel switch is in contact with the second travel switch to form a passage; 5) the slide block moves to the appointed position of the front end of the slide block, which is right opposite to the positioning groove; 6) after the steps are completed, the movable template is translated forwards to be closed and locked with the fixed template, and the movable template returns to a mold closing state. In the step 4), if the first travel switch and the second travel switch send out error signals due to electronic faults or short circuits, at this time, because the front end of the anti-collision rod penetrates into the safety hole of the sliding block to be clamped, the sliding block cannot reset and is opposite to the positioning groove, and the fixed die plate and the movable die plate cannot be assembled, the ejector pin can be prevented from being broken and the front die cavity and the rear die cavity can be prevented from being crushed.

Preferably, the diameter of the bumper bar is larger than that of the thimble, and the diameter of the bumper bar is smaller than the diameter of the safety hole. When the strength of the anti-collision rod is ensured, the front end of the anti-collision rod can smoothly penetrate into the safety hole before the injection molding product is ejected.

Preferably, the sliding block is connected with a piston rod of an oil cylinder, the oil cylinder is installed on the movable template, the oil cylinder is provided with a first oil path and a second oil path, and when oil enters the first oil path, the piston rod pushes the sliding block to move to a specified position opposite to the positioning groove; when the second oil path is fed with oil, the piston rod pulls the sliding block to move back to the position where the safety hole of the sliding block is over against the bumper bar.

Furthermore, the sliding block comprises a base, a first positioning end and a second positioning end which are integrally arranged, the first positioning end is matched with the positioning groove, one end of the base is connected with the piston rod, the second positioning end is arranged at the other end of the base, the safety hole is formed in the base and penetrates through the first positioning end, after the fixed template and the movable template are assembled, one sides of the fixed template and the movable template, which are close to the sliding block, are encircled to form a limiting groove, and the second positioning end extends into the limiting groove and presses one end of an injection product. The design of the sliding block can improve the die assembly accuracy, and the sliding block plays a certain positioning role in an injection molding product to ensure the injection molding effect.

Compared with the prior art, the utility model has the following advantages: the anti-collision structure for the injection mold is simple and practical in structure, is a mechanical anti-collision and error-proofing structure suitable for the slider core-pulling type injection mold, can ensure the safety and reliability of the ejection process of an injection product, and can effectively prevent the fixed mold plate and the movable mold plate from being assembled after the first travel switch and the second travel switch have electronic faults or short circuits, thereby preventing the ejector pin from being broken and preventing the front mold cavity and the rear mold cavity from being crushed during abnormal assembly.

Drawings

FIG. 1 is a view showing a mold clamping state of an injection mold according to an embodiment;

FIG. 2 is a diagram showing an open state of the injection mold in the example.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

The anti-collision structure for the injection mold of the embodiment is shown in fig. 1 and fig. 2, the injection mold comprises a movable mold plate 1, a fixed mold plate 2 and an ejector pin 3, a first travel switch 4, a second travel switch 5 and a bottom plate 6 are installed at the rear part of the movable mold plate 1, the bottom plate 6 can move back and forth under the driving of a push rod (not shown in the figure) of the injection mold, the first travel switch 4 and the second travel switch 5 are respectively arranged at two limit positions of the travel of the bottom plate 6 front and back, the ejector pin 3 is vertically fixed at the front end of the bottom plate 6, a slide block 7 capable of moving left and right is installed at the front end of the movable mold plate 1, a positioning groove 21 matched with the front end of the slide block 7 is arranged at the rear end of the fixed mold plate 2, after the fixed mold plate 2 and the movable mold plate 1 are assembled, the front end of the slide block 7 is completely embedded into the positioning groove 21, and the front and back mold cavities of the fixed mold plate 2 and the movable mold plate 1 enclose a mold cavity for accommodating an injection product 8, the anti-collision structure comprises an anti-collision rod 9, wherein the anti-collision rod 9 is vertically fixed at the front end of a bottom plate 6, the anti-collision rod 9 is opposite to a slide block 7, a safety hole 71 matched with the anti-collision rod 9 is formed in the slide block 7, as a preferred scheme, the diameter of the anti-collision rod 9 is larger than that of a thimble 3, and the diameter of the anti-collision rod 9 is 0.5mm smaller than that of the safety hole 71; after the mold is opened, when the slide block 7 is retreated to the designated position, the safety hole 71 is over against the anti-collision rod 9, at this time, the push rod of the injection mold can push the bottom plate 6 forward, and the injection product 8 is ejected out through the ejector pin 3.

In the embodiment, the sliding block 7 is connected with a piston rod of an oil cylinder 10, the oil cylinder 10 is installed on the movable template 1, the oil cylinder 10 is provided with a first oil path 101 and a second oil path 102, and when oil enters the first oil path 101, the piston rod pushes the sliding block 7 to move to a specified position opposite to the positioning groove 21; when oil enters the second oil path 102, the piston rod pulls the slide block 7 to move back to the position where the safety hole 71 of the slide block is opposite to the bumper bar 9.

In this embodiment, the slider 7 includes the base 72, first locating end 73 and the second locating end 74 that integrative set up, first locating end 73 and locating groove 21 looks adaptation, the one end of base 72 links to each other with the piston rod, the other end of base 72 is located to the second locating end 74, safety hole 71 is seted up in base 72 and is run through first locating end 73, after fixed die plate 2 and movable die plate 1 compound die, fixed die plate 2 and movable die plate 1 one side that is close to slider 7 enclose into spacing groove 22, second locating end 74 stretches into spacing groove 22 and pushes down the one end of injection moulding product 8.

Fig. 1 is a mold closing state diagram of an injection mold specifically applied to the anti-collision structure of the embodiment, in which injection molding operation can be performed, and after injection molding is completed, the corresponding operation flows and steps of each component are as follows: 1) the fixed mold plate 2 is kept still, the movable mold plate 1 moves backwards and horizontally to a designated position, and the injection mold is in a mold opening state shown in fig. 2 at the moment; 2) when oil enters the second oil path 102, the piston rod pulls the sliding block 7 to move back to the position where the safety hole 71 of the sliding block is over against the bumper bar 9; 3) a push rod of the injection mold pushes the bottom plate 6 forwards, the ejector pin 3 and the anti-collision rod 9 synchronously move forwards along with the bottom plate 6 until the ejector pin 3 ejects the injection product 8 out and the front end of the anti-collision rod 9 penetrates into the safety hole 71, and the injection product 8 is manually taken out; 4) the circulation operation is started, the first travel switch 4 and the second travel switch 5 send signals, a push rod of the injection mold drives the bottom plate 6, the ejector pin 3 and the anti-collision rod 9 to reset, and the first travel switch 4 and the second travel switch 5 are in contact and form a passage; 5) when oil enters the first oil path 101, the piston rod pushes the slide block 7 to move to a specified position where the front end of the slide block is aligned with the positioning groove 21; 6) after the steps are completed, the movable template 1 is translated forwards to be closed and locked with the fixed template 2, and the movable template returns to a mold closing state. In the step 4), if the first travel switch 4 and the second travel switch 5 send out error signals due to electronic faults or short circuits, at this time, because the front end of the anti-collision rod 9 penetrates into the safety hole 71 of the slide block 7 to be clamped, the slide block 7 cannot be reset and is opposite to the positioning groove 21, and the fixed mold plate 2 and the movable mold plate 1 cannot be closed, the ejector pin 3 can be prevented from being broken and the front mold cavity and the rear mold cavity can be prevented from being crushed.

Claims (4)

1. An anti-collision structure for an injection mold comprises a movable mold plate, a fixed mold plate and an ejector pin, wherein a first travel switch, a second travel switch and a bottom plate are installed at the rear part of the movable mold plate, the bottom plate can move back and forth under the driving of a push rod of the injection mold, the first travel switch and the second travel switch are respectively arranged at two limit positions of the travel of the bottom plate in a front-back mode, the ejector pin is vertically fixed at the front end of the bottom plate, a slide block capable of moving left and right is installed at the front end of the movable mold plate, a positioning groove matched with the front end of the slide block is formed in the rear end of the fixed mold plate, after the fixed mold plate and the movable mold plate are assembled, the front end of the slide block is completely embedded into the positioning groove, and the fixed mold plate and the front and rear mold cavities of the movable mold plate enclose a mold cavity for accommodating injection products, the anti-collision structure is characterized by comprising an anti-collision rod, wherein the anti-collision rod is vertically fixed at the front end of the bottom plate, the anti-collision rod is opposite to the slide block, a safety hole matched with the anti-collision rod is formed in the slide block, after the mold is opened, when the slide block moves back to a specified position, the safety hole is over against the anti-collision rod, the push rod of the injection mold can push the bottom plate forwards, and an injection product is ejected through the ejector pin.

2. The crash-proof structure for injection mold as claimed in claim 1, wherein the diameter of said crash-proof rod is larger than the diameter of said ejector pin, and the diameter of said crash-proof rod is smaller than the diameter of said safety hole.

3. The anti-collision structure for the injection mold according to claim 1, wherein the slider is connected with a piston rod of an oil cylinder, the oil cylinder is mounted on the movable mold plate, the oil cylinder is provided with a first oil path and a second oil path, and when oil enters the first oil path, the piston rod pushes the slider to move to a specified position opposite to the positioning groove; when the second oil path is fed with oil, the piston rod pulls the sliding block to move back to the position where the safety hole of the sliding block is over against the bumper bar.

4. The anti-collision structure for the injection mold according to claim 3, wherein the sliding block comprises a base, a first positioning end and a second positioning end which are integrally arranged, the first positioning end is matched with the positioning groove, one end of the base is connected with the piston rod, the second positioning end is arranged at the other end of the base, the safety hole is formed in the base and penetrates through the first positioning end, after the fixed mold plate and the movable mold plate are assembled, one side, close to the sliding block, of the fixed mold plate and one side, close to the sliding block, of the movable mold plate enclose a limiting groove, and the second positioning end extends into the limiting groove and presses one end of an injection product.

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