A two-platen injection molding machine

Abstract

The present invention discloses a two-platen injection molding machine, which includes a front platen, four tie bars, a clamping cylinder, and a tie bar extraction device. The tie bar extraction device includes two hydraulic clamps and a clamp mounting ring. The hydraulic clamps are provided with buckles. The clamp mounting ring is installed on the cylinder abutting surface on the back of the front platen. The clamp mounting ring is symmetrically and outwardly extended with mounting blocks, and the two hydraulic clamps are correspondingly installed on the two mounting blocks. An angle is formed between the center connection line of the two hydraulic clamps and the horizontal line to avoid interference between the hydraulic clamps and the casting surface on the back of the front platen. The tie bars pass through the inner holes of the clamp mounting ring and the tie bar through holes on the front platen. The sum of the axial length of the cylinder barrel of the clamping cylinder and the thickness of the clamp mounting ring is consistent with the axial length of the cylinder barrel of a standard clamping cylinder. A clamping groove is provided at a position on the cylinder barrel of the clamping cylinder corresponding to the buckle. The advantage is that its tie bar extraction device is applicable to front platens with a flat, curved or special-shaped surface on the back, and the strength of the front platen remains unchanged.

Description

Technical Field

[0001] The present invention relates to an injection molding machine, and more particularly to a two-platen injection molding machine. Background Art

[0002] The two-platen injection molding machine is one of the best solutions for large injection components in the current injection molding machine industry. Figure 1 A simple schematic diagram of an existing two-platen injection molding machine is given. The two-platen injection molding machine includes an injection part 91, a front platen 92, a second platen 93, four tie bars 94 disposed between the four corner regions of the front platen 92 and the corresponding corner regions of the second platen 93, a clamping cylinder 95 disposed at one end of the tie bar 94 close to the front platen 92, and a clamping device 96 disposed at the other end of the tie bar 94 close to the second platen 93. During operation, the mold is lifted into the space between the front platen 92 and the second platen 93. In the process of using such a two-platen injection molding machine, some customers may use large-sized molds 97 with dimensions exceeding the distance between the two horizontal tie bars 94. In order to smoothly lift such large-sized molds 97 into the space between the front platen 92 and the second platen 93, it is usually necessary to design a tie bar extraction device. By extracting one of the tie bars 94 located above, the large-sized mold 97 can be smoothly lifted in. After the large-sized mold 97 is lifted in, the extracted tie bar 94 is reset.

[0003] The existing tie bar extraction device is as Figure 2As shown in the figure, it includes a draw bar support 81, a draw bar oil cylinder 82, and two hydraulic clamps 83. The draw bar support 81 is horizontally arranged. The bottom of the first end of the draw bar support 81 is fixed to the top side of the head plate 92. The bottom of the draw bar support 81 is connected with a transition plate 84 through a linear guide slider assembly (not shown in the figure). The draw bar oil cylinder 82 is horizontally arranged and its axis is parallel to the axis of the draw bar 94. The end of the piston rod of the draw bar oil cylinder 82 is fixedly connected to the side surface of the first end of the draw bar support 81. The cylinder barrel of the draw bar oil cylinder 82 is fixed to the transition plate 84. The bottom of the transition plate 84 is fixedly connected to the cylinder barrel of a clamping oil cylinder 95 arranged at one end of the draw bar 94 to be drawn out. The two hydraulic clamps 83 are symmetrically distributed on the left and right sides of the draw bar 94 to be drawn out. The inner side of the hydraulic clamp 83 has a buckle 831. One of the hydraulic clamps 83 is installed on the side wall of the head plate 92 through a mounting plate 832, and the other hydraulic clamp 83 is installed on the back surface of the head plate 92. Two clamping grooves 951 are symmetrically arranged on the cylinder barrel of the clamping oil cylinder 95. When the draw bar 94 needs to be drawn out, first open the hydraulic clamp so that the buckle 831 disengages from the clamping groove 951, and then extend the piston rod of the draw bar oil cylinder 82. Since the end of the piston rod of the draw bar oil cylinder 82 is fixed, and the cylinder barrel of the draw bar oil cylinder 82 can move relative to the draw bar support 81, the cylinder barrel of the draw bar oil cylinder 82 drives the clamping oil cylinder 95 and the draw bar 94 to move, and the draw bar 94 is drawn out; when the draw bar 94 is reset, retract the piston rod of the draw bar oil cylinder 82, and the cylinder barrel of the draw bar oil cylinder 82 drives the clamping oil cylinder 95 and the draw bar 94 to move back, and the draw bar 94 is pushed back to its original position. After the draw bar 94 is pushed to its original position, the end surface of the clamping oil cylinder 95 fits against the back surface of the head plate 92, and the buckle 831 of the hydraulic clamp 83 is snapped into the clamping groove 951 under the hydraulic action to lock the clamping oil cylinder 95, that is, the position of the draw bar 94 is fixed. This draw bar extraction device can smoothly draw out the draw bar 94 and reset it. However, on the one hand, this draw bar extraction device can only be applied to a two-platen injection molding machine with a flat back surface of the head plate 92. If the back surface of the head plate 92 is curved or has a special-shaped surface, then the hydraulic clamp 83 cannot be installed; on the other hand, when this draw bar extraction device is applied to a two-platen injection molding machine with a flat back surface of the head plate 92, a region near the draw bar perforation 98 on the back surface of the head plate 92 needs to be machined into a flat surface, and one of the hydraulic clamps 83 is installed on this flat surface. However, reprocessing will inevitably reduce the overall strength of the head plate 92. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a two-platen injection molding machine, the draw bar extraction device of which is applicable to the head plate with a flat, curved or special-shaped surface on the back, has good versatility, and the strength of its head plate remains unchanged.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: A two-platen injection molding machine includes a front plate, four tie rods arranged in the four corner regions of the front plate, a clamping cylinder arranged at one end of the tie rods, and a tie rod extraction device for extracting and resetting one of the tie rods located above. It is characterized in that: the tie rod extraction device includes two hydraulic clamps and a clamp mounting ring for mounting the hydraulic clamps. A buckle is arranged on the hydraulic clamp. The clamp mounting ring is mounted on the cylinder abutting surface on the back of the front plate. Mounting blocks symmetrically extend outward on both sides of the clamp mounting ring. The two hydraulic clamps are correspondingly mounted on the two mounting blocks so that the two buckles face each other. After the clamp mounting ring is mounted on the cylinder abutting surface on the back of the front plate, an angle is formed between the center connection line of the two hydraulic clamps and the horizontal line to avoid interference between the two hydraulic clamps and the casting surface on the back of the front plate. The tie rod passes through the inner hole of the clamp mounting ring and the tie rod through hole on the front plate. The sum of the axial length of the cylinder barrel of the clamping cylinder and the thickness of the clamp mounting ring is the same as the axial length of the cylinder barrel of the standard clamping cylinder. A clamping groove is arranged at a position on the cylinder barrel of the clamping cylinder corresponding to the buckle.

[0006] The inner diameter of the inner hole of the clamp mounting ring is larger than the diameter of the tie rod. A convex ring is integrally arranged at the front end of the cylinder barrel of the clamping cylinder. When the front end face of the cylinder barrel of the clamping cylinder abuts against the end face of the clamp mounting ring, the convex ring is embedded in the inner hole of the clamp mounting ring. By designing the inner hole of the clamp mounting ring to be of a larger size and arranging a convex ring at the front end of the cylinder barrel of the clamping cylinder, and the convex ring is embedded in the inner hole of the clamp mounting ring when the front end face of the cylinder barrel of the clamping cylinder abuts against the end face of the clamp mounting ring, the clamping cylinder can be made more stable after the tie rod is reset.

[0007] The described draw bar extraction device further includes a draw bar bracket and a draw bar oil cylinder. The draw bar bracket is horizontally arranged. The bottom of the first end of the draw bar bracket is fixed to the top side of the head plate. The bottom of the draw bar bracket is connected with a transition plate through a linear guide rail slider assembly. The draw bar oil cylinder is horizontally arranged and its axis is parallel to the axis of the draw bar. The end of the piston rod of the draw bar oil cylinder is fixedly connected to the side surface of the first end of the draw bar bracket. The cylinder barrel of the draw bar oil cylinder is fixed above the transition plate. The transition plate is fixedly connected to the top of the cylinder barrel of the clamping die oil cylinder. Since the end of the piston rod of the draw bar oil cylinder is fixedly connected to the side surface of the first end of the draw bar bracket, that is, the end of the piston rod of the draw bar oil cylinder is fixed. And the cylinder barrel of the draw bar oil cylinder is fixedly connected with the transition plate. The transition plate can move back and forth along the length direction of the draw bar bracket. The transition plate is fixedly connected to the cylinder barrel of the clamping die oil cylinder. Therefore, the cylinder barrel of the draw bar oil cylinder can drive the clamping die oil cylinder and the draw bar to move back and forth to extract and reset the draw bar.

[0008] The described linear guide rail slider assembly includes a linear guide rail arranged on the bottom of the draw bar bracket along the length direction of the draw bar bracket and a slider arranged on the upper surface of the transition plate. The slider cooperates with the linear guide rail and slides back and forth on the linear guide rail.

[0009] The driving mode of the draw bar oil cylinder is hydraulic or pneumatic or electric, and different driving modes can be selected according to actual requirements.

[0010] Compared with the prior art, the advantages of the present invention are as follows:

[0011] 1) Installing two hydraulic clamps at the diagonal positions can not only effectively avoid the casting surface on the back of the head plate for the hydraulic clamps. In this way, by adjusting the installation position of the clamp mounting ring, that is, by adjusting the installation positions of the two hydraulic clamps, this draw bar extraction device can be applied to the secondary injection molding machine with a flat or curved or special-shaped surface on the back of the head plate, and has good versatility. Moreover, it can avoid milling the hydraulic clamp mounting surface on the back of the head plate, thus preventing stress concentration on the back of the head plate, maintaining the overall strength of the head plate, and also saving the cost brought by milling the hydraulic clamp mounting surface.

[0012] 2) Since a clamp mounting ring is added to the oil cylinder abutting surface on the back of the head plate, it will cause the position of the draw bar brake to shift. Therefore, the cylinder barrel structure of the standard clamping die oil cylinder is improved, and the axial length of the cylinder barrel of the clamping die oil cylinder is shortened, effectively reducing the casting cost of the cylinder barrel of the clamping die oil cylinder.

[0013] 3) The symmetrical arrangement of the hydraulic clamps ensures uniform force on the clamping die oil cylinder and avoids the occurrence of eccentric loading. Brief Description of the Drawings

[0014] Figure 1 is a schematic diagram of an existing two-platen injection molding machine;

[0015] Figure 2 is an existing tie rod extraction device applied to a two-platen injection molding machine;

[0016] Figure 3 is a schematic structural diagram of a part of the two-platen injection molding machine of the present invention;

[0017] Figure 4 is Figure 3 a side view of;

[0018] Figure 5 is a plan view of a clamp mounting ring in the tie rod extraction device of the two-platen injection molding machine of the present invention;

[0019] Figure 6 is an axonometric side view of a clamping cylinder in the two-platen injection molding machine of the present invention;

[0020] Figure 7 is Figure 6 a sectional view taken along line A-A of; Detailed Description of the Preferred Embodiments

[0021] The present invention will be further described in detail below with reference to the embodiments in conjunction with the drawings.

[0022] A two-platen injection molding machine proposed by the present invention, as shown in Figures 3 to 7 , includes a fixed platen 1, four tie rods 2 arranged at four corner regions of the fixed platen 1, a clamping cylinder 3 arranged at one end of the tie rods 2, and a tie rod extraction device 4 for extracting and resetting one of the tie rods 2 located above. The tie rod extraction device 4 includes two hydraulic clamps 41 and a clamp mounting ring 42 for mounting the hydraulic clamps 41. A buckle 411 is arranged on the hydraulic clamp 41. The clamp mounting ring 42 is installed on the cylinder abutting surface (not shown in the figure) on the back of the fixed platen 1 by screws. Mounting blocks 421 symmetrically extend outward on both sides of the clamp mounting ring 42. The two hydraulic clamps 41 are correspondingly mounted on the two mounting blocks 421 so that the two buckles 411 face each other. After the clamp mounting ring 42 is installed on the cylinder abutting surface on the back of the fixed platen 1, an angle is formed between the center connection line of the two hydraulic clamps 41 and the horizontal line to avoid interference between the two hydraulic clamps 41 and the casting surface 11 on the back of the fixed platen 1. The tie rod 2 passes through the inner hole 422 of the clamp mounting ring 42 and the tie rod through hole (not shown in the figure) on the fixed platen 1. The sum of the axial length of the cylinder barrel of the clamping cylinder 3 and the thickness of the clamp mounting ring 42 is the same as the axial length of the cylinder barrel of a standard clamping cylinder. A clamping groove 31 is arranged at a position on the cylinder barrel of the clamping cylinder 3 corresponding to the buckle 411.

[0023] In this embodiment, the aperture of the inner hole 422 of the fixture mounting ring 42 is larger than the diameter of the pull rod 2. A convex ring 32 is integrally provided at the front end of the cylinder barrel of the clamping cylinder 3. When the front end face of the cylinder barrel of the clamping cylinder 3 abuts against the end face of the fixture mounting ring 42, the convex ring 32 is embedded in the inner hole 422 of the fixture mounting ring 42. By designing the inner hole 422 of the fixture mounting ring 42 to be of a larger size and providing a convex ring 32 at the front end of the cylinder barrel of the clamping cylinder 3, and when the front end face of the cylinder barrel of the clamping cylinder 3 abuts against the end face of the fixture mounting ring 42, the convex ring 32 is embedded in the inner hole 422 of the fixture mounting ring 42, the clamping cylinder 3 can be made more stable after the pull rod is reset.

[0024] In this embodiment, the pull rod extraction device 4 further includes a pull rod support 43 and a pull rod cylinder 44. The pull rod support 43 is horizontally arranged. The bottom of the first end of the pull rod support 43 is fixed to the top side of the front plate 1 through a pull rod mounting block 45. The bottom of the pull rod support 43 is connected with a transition plate 47 through a linear guide rail slider assembly 46. The pull rod cylinder 44 is horizontally arranged and its axis is parallel to the axis of the pull rod 2. The end of the piston rod of the pull rod cylinder 44 is fixedly connected to the side face of the first end of the pull rod support 43. The cylinder barrel of the pull rod cylinder 44 is fixed above the transition plate 47 through a flange 48. The transition plate 47 is fixedly connected to the top of the cylinder barrel of the clamping cylinder 3 through screws. Since the end of the piston rod of the pull rod cylinder 44 is fixedly connected to the side face of the first end of the pull rod support 43, that is, the end of the piston rod of the pull rod cylinder 44 is stationary, and the cylinder barrel of the pull rod cylinder 44 is fixedly connected to the transition plate 47, and the transition plate 47 can move back and forth along the length direction of the pull rod support 43, and the transition plate 47 is fixedly connected to the cylinder barrel of the clamping cylinder 3, so the cylinder barrel of the pull rod cylinder 44 can drive the clamping cylinder 3 and the pull rod 2 to move back and forth to extract and reset the pull rod 2.

[0025] In this embodiment, the linear guide rail slider assembly 46 includes a linear guide rail 461 arranged on the bottom of the pull rod support 43 along the length direction of the pull rod support 43 and a slider 462 arranged on the upper surface of the transition plate 47. The slider 462 cooperates with the linear guide rail 461, and the slider 462 slides back and forth on the linear guide rail 461.

[0026] In this embodiment, the driving mode of the pull rod cylinder 44 is hydraulic or pneumatic or electric, and different driving modes can be selected according to actual requirements.

[0027] When designing the fixture mounting ring 42, the shape of the fixture mounting ring 42 can be made consistent with the shape of the oil cylinder abutting surface on the back of the front plate 1, so as to ensure the aesthetics and consistency of the overall front plate 1 after the fixture mounting ring 42 is installed.

[0028] When the two-platen injection molding machine is operating normally, the cylinder barrel of the mold clamping cylinder 3 is locked by two hydraulic fixtures 41; when the tie rod 2 needs to be withdrawn, first loosen the hydraulic fixture 41, and then drive the transition plate 47, the cylinder barrel of the mold clamping cylinder 3 and the tie rod 2 to move outwards together through the tie rod pulling cylinder 44. When the stroke of the tie rod pulling cylinder 44 reaches the maximum, the tie rod 2 is completely withdrawn; after the customer completes the action of hoisting the large-size mold, drive the transition plate 47, the cylinder barrel of the mold clamping cylinder 3 and the tie rod 2 to move inwards together through the tie rod pulling cylinder 44 to reset the tie rod 2, and then make the hydraulic fixture 41 clamp the cylinder barrel of the mold clamping cylinder 3.

Claims

1. A two-platen injection molding machine, comprising a fixed platen, four tie bars arranged on four corner regions of the fixed platen, a clamping cylinder arranged at one end of the tie bars, and a tie bar extraction device for extracting and resetting one of the tie bars located above, wherein: The described drawbar extraction device includes two hydraulic clamps and a clamp mounting ring for mounting the hydraulic clamps. The hydraulic clamps are provided with buckles. The clamp mounting ring is mounted on the cylinder abutment surface on the back of the platen. Symmetrically outwardly extending mounting blocks are provided on both sides of the clamp mounting ring. The two hydraulic clamps are correspondingly mounted on the two mounting blocks such that the two buckles face each other. After the clamp mounting ring is mounted on the cylinder abutment surface on the back of the platen, an angle is formed between the center line of the two hydraulic clamps and the horizontal line to avoid interference between the two hydraulic clamps and the casting surface on the back of the platen. The drawbar passes through the inner hole of the clamp mounting ring and the drawbar perforation on the platen. The sum of the axial length of the cylinder barrel of the clamping cylinder and the thickness of the clamp mounting ring is consistent with the axial length of the cylinder barrel of the standard clamping cylinder. A card slot is provided at a position on the cylinder barrel of the clamping cylinder corresponding to the buckle.

2. The two-platen injection molding machine according to claim 1, wherein: The inner diameter of the inner hole of the clamp mounting ring is larger than the diameter of the drawbar. A convex ring is integrally provided at the front end of the cylinder barrel of the clamping cylinder. When the front end face of the cylinder barrel of the clamping cylinder abuts against the end face of the clamp mounting ring, the convex ring is embedded in the inner hole of the clamp mounting ring.

3. The two-platen injection molding machine according to claim 1 or 2, characterized in that: The drawbar extraction device further includes a drawbar support and a drawbar cylinder. The drawbar support is horizontally arranged. The bottom of the first end of the drawbar support is fixed on one side of the top of the platen. The bottom of the drawbar support is connected to a transition plate through a linear guide rail slider assembly. The drawbar cylinder is horizontally arranged and its axis is parallel to the axis of the drawbar. The end of the piston rod of the drawbar cylinder is fixedly connected to the side face of the first end of the drawbar support. The cylinder barrel of the drawbar cylinder is fixed above the transition plate. The transition plate is fixedly connected to the top of the cylinder barrel of the clamping cylinder.

4. The two-platen injection molding machine according to claim 3, wherein: The linear guide rail slider assembly includes a linear guide rail arranged along the length direction of the drawbar support on the bottom of the drawbar support and a slider arranged on the upper surface of the transition plate. The slider cooperates with the linear guide rail and slides back and forth on the linear guide rail.

5. A two-platen injection molding machine according to claim 3, characterized in that: The driving mode of the drawbar cylinder is hydraulic or pneumatic or electric.

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