Mounting structure assembly of mold closing oil cylinder of two-plate type injection molding machine

Abstract

The utility model belongs to the field of mold closing oil cylinder installation, and provides an installation structure assembly of a mold closing oil cylinder of a two-plate type injection molding machine, which comprises a pull rod, the pull rod penetrates through a fixed mold plate and a piston, a plurality of first annular clamping teeth are distributed at the end part of the pull rod at intervals along the axis direction of the pull rod, and a first annular clamping groove is formed between every two adjacent first annular clamping teeth; the piston nut is detachably connected to the piston, a plurality of second annular clamping teeth are distributed on the inner wall of the piston nut at intervals in the axis direction of the piston nut, and a second annular clamping groove is formed between every two adjacent second annular clamping teeth. Compared with the prior art, the utility model has the advantages that the pull rod and the piston are connected by adopting an annular tooth meshing mode, so that the smooth fillet transition of the pull rod is ensured, the stress concentration is reduced, and the pull rod is allowed to have a certain moving space to release stress, thereby obviously reducing the risk that the pull rod is broken due to fatigue; and the overall performance and the service life of the oil cylinder are improved.

Description

Technical Field

[0001] The utility model belongs to the field of mold clamping oil cylinder installation, in particular to an installation structure assembly of a mold clamping oil cylinder of a two-platen injection molding machine. Background Art

[0002] Injection molding machines, also known as injection molding machines or injection machines, are the primary molding equipment used to create various shapes of plastic products from thermoplastics or thermosetting plastics using plastic molding molds. They are available in vertical, horizontal, and all-electric models. They heat the plastic and apply high pressure to the molten plastic, causing it to be ejected and fill the mold cavity.

[0003] During the operation of a two-platen injection molding machine's high-pressure mold clamping cylinder, the connection between the tie rod and the piston is crucial for ensuring proper operation. Traditional mold clamping cylinder installation methods typically utilize a threaded connection between the piston and the connecting rod. However, due to the relatively long thread length at the connection, stress concentration at the threaded connection can easily lead to fatigue fracture of the tie rod over long-term use, impacting the cylinder's operating efficiency and safety. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a mounting structure assembly for a clamping cylinder of a two-platen injection molding machine.

[0005] The utility model solves the technical problem by adopting a technical solution that proposes a mounting structure assembly of a clamping cylinder of a two-platen injection molding machine, comprising: a fixed platen;

[0006] An oil cylinder is provided on the fixed template, and a piston is arranged in the oil cylinder;

[0007] A pull rod, the pull rod passing through the fixed template and the piston, a plurality of first annular teeth spaced apart along the axial direction of the end of the pull rod, and a first annular groove formed between two adjacent first annular teeth;

[0008] A piston nut is detachably connected to the piston, wherein the inner wall of the piston nut is provided with a plurality of second annular teeth spaced apart along its axial direction, and a second annular groove is formed between two adjacent second annular teeth. When the first annular tooth or the second annular tooth is movably engaged with the second annular groove or the first annular groove, a clearance cavity can be formed in the piston nut or the pull rod, respectively.

[0009] The piston nut can be movably engaged with the second annular groove by the first annular tooth. When the second annular tooth is movably engaged with the first annular groove, it is connected to the pull rod to fix the piston nut on the oil cylinder.

[0010] In the above-mentioned installation structure assembly of the clamping cylinder of a two-platen injection molding machine, the piston nut includes a first half-ring block and a second half-ring block. The inner walls of the first annular block and the second annular block are both provided with the second annular teeth and the second annular grooves, so that when the first half-ring block and the second half-ring block approach each other, they can be tightly attached to the pull rod.

[0011] In the above-mentioned installation structure assembly of the clamping cylinder of a two-platen injection molding machine, an arc transition surface is formed on the inner wall of the relief cavity.

[0012] In the above-mentioned installation structure assembly of the clamping cylinder of a two-platen injection molding machine, a piston cover plate is movably abutted against the end of the pull rod. An anti-disengagement block is formed at the periphery of the piston cover plate. Positioning grooves are formed at the ends of the first half-ring block and the second half-ring block away from the piston. The anti-disengagement block is movably abutted in the positioning grooves to limit the displacement between the first half-ring block and the second half-ring block.

[0013] In the above-mentioned installation structure assembly of the clamping cylinder of a two-platen injection molding machine, a connecting hole is jointly formed by the piston cover plate, the piston and the first half-ring block or the second half-ring block. The connecting hole can be penetrated by a locking member, so that the piston nut is connected to the piston.

[0014] In the above-mentioned installation structure assembly of the clamping cylinder of a two-platen injection molding machine, an oil cylinder rear cover is further connected to the oil cylinder. The oil cylinder rear cover can be installed with a displacement sensor for recording the stroke of the oil cylinder.

[0015] Compared with the prior art, the advantages of the present utility model are that by adopting the way of annular tooth meshing to connect the pull rod and the piston, the fillet transition of the pull rod is ensured to be smooth, the stress concentration is reduced, and a certain movement space is allowed for the pull rod to release stress, thereby significantly reducing the risk of the pull rod breaking due to fatigue and improving the overall performance and service life of the oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional schematic view of the present application;

[0017] Figure 2 is Figure 1 a partial enlarged view of part A in

[0018] In the figure, 1, fixed template;

[0019] 2, oil cylinder; 20, piston; 21, oil cylinder rear cover; 210, displacement sensor;

[0020] 3, pull rod; 30, first annular teeth; 31, first annular groove; 32, piston cover plate; 320, anti-disengagement block;

[0021] 4. Piston nut; 40. First half-ring block; 41. Second half-ring block; 420. Second annular locking tooth; 421. Second annular slot; 422. Positioning slot; 43. Connecting hole; 430. Locking member;

[0022] 5. Relief cavity; 50. Arc transition surface. Specific embodiments

[0023] The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0024] As Figures 1 to 2 shown, an installation structure assembly of a clamping cylinder 2 of a two-platen injection molding machine according to the present invention includes: a fixed platen 1; a cylinder 2 disposed on the fixed platen 1, and a piston 20 is disposed in the cylinder 2; a tie rod 3, the tie rod 3 passes through the fixed platen 1 and the piston 20, and a plurality of first annular locking teeth 30 are spaced apart along the axial direction of the end of the tie rod 3, and a first annular slot 31 is formed between two adjacent first annular locking teeth 30; a piston nut 4 detachably connected to the piston 20, and a plurality of second annular locking teeth 420 are spaced apart along the axial direction of the inner wall of the piston nut 4, and a second annular slot 421 is formed between two adjacent second annular locking teeth 420. When the first annular locking tooth 30 or the second annular locking tooth 420 is movably clamped in the second annular slot 421 or the first annular slot 31, a relief cavity 5 can be formed in the piston nut 4 or the tie rod 3 respectively; the piston nut 4 can be connected to the tie rod 3 when the first annular locking tooth 30 is movably clamped in the second annular slot 421 and the second annular locking tooth 420 is movably clamped in the first annular slot 31, so as to fix the piston nut 4 on the cylinder 2.

[0025] This embodiment is mainly used for the installation structure of the high-pressure clamping cylinder 2 of a two-platen injection molding machine. Specifically, as Figures 1 to 2 shown, for the connection method between the piston 20 and the tie rod 3, this solution passes the tie rod 3 through the fixed platen 1 and the piston 20 at the same time, and utilizes the tie rod 3 in Figure 1The first annular locking teeth 30 formed at the right end and the second annular slot 421 are respectively engaged with the second annular slot 421 and the second annular locking teeth 420 on the inner wall of the piston nut 4, so as to realize the pre-installation of the piston nut 4 and the pull rod 3, which provides a guarantee for the piston nut 4 to be firmly fixed to the piston 20 in subsequent operations. Moreover, during the engagement process of the above-mentioned annular locking teeth and annular slots, a relief cavity 5 is jointly formed between them. This relief cavity 5 can effectively allow the pull rod 3 to have a certain amount of play space (the movement of the pull rod 3 in the radial direction) to release stress, thereby significantly reducing the risk of the pull rod 3 breaking due to fatigue, improving the overall performance and service life of the oil cylinder 2. And when connecting the pull rod 3 and the piston 20 by means of annular tooth engagement, it also effectively ensures the smooth fillet transition of the pull rod 3 and reduces stress concentration.

[0026] The piston nut 4 includes a first half-ring block 40 and a second half-ring block 41. The inner walls of the first annular block and the second annular block are both provided with second annular locking teeth 420 and second annular slots 421, so that when the first half-ring block 40 and the second half-ring block 41 approach each other, they can be closely attached to the pull rod 3.

[0027] As Figure 2 shown, in this embodiment, the piston nut 4 adopts a two-half-ring structure to realize the installation with the pull rod 3 and the piston 20. Specifically, during the installation process, the first half-ring block 40 and the second half-ring block 41 can easily approach each other from the upper and lower sides of the pull rod 3 and abut against the outer wall of the pull rod 3. During this process, the second annular locking teeth 420 are movably engaged in the first annular slot 31, and the second annular slot 421 is also engaged with the first annular locking teeth 30, so as to limit the relative axial displacement between the piston nut 4 and the pull rod 3. After the above installation steps are completed, the first half-ring block 40 and the second half-ring block 41 can be connected together by other connecting components such as bolts and screws. The overall operation is simple, and it also provides convenience for subsequent maintenance and replacement.

[0028] Preferably, as Figure 2 shown, the inner wall of the relief cavity in this solution forms an arc transition surface 50. This arc transition surface 50 can not only provide enough play space for the pull rod 3 to release stress, effectively avoiding fatigue fracture of the pull rod 3 due to insufficient play space, but also utilize the smooth transition of the arc transition surface 50 to effectively avoid cracks on the bottom walls of the first annular slot 31 and the second annular slot 421 due to stress concentration.

[0029] One end of the pull rod 3 is movably abutted against a piston cover plate 32. An anti-disengagement block 320 is formed at the periphery of the piston cover plate 32. Positioning grooves 422 are formed at the ends of the first half-ring block 40 and the second half-ring block 41 away from the piston 20. The anti-disengagement block 320 is movably abutted in the positioning grooves 422 to limit the displacement between the first half-ring block 40 and the second half-ring block 41.

[0030] As Figure 1 shown, when the piston cover plate 32 is movably abutted against the right end of the pull rod 3, the anti-disengagement block 320 formed at the periphery of the piston cover plate 32 can be abutted in the positioning grooves 422. This structure can not only effectively position the installation of the piston cover plate 32, but also effectively prevent the first half-ring block 40 and the second half-ring block 41 from moving relative to the pull rod 3 or even falling off after approaching and abutting against each other by means of the cooperation between the anti-disengagement block 320 and the positioning grooves 422.

[0031] Preferably, as Figure 1 shown, in this embodiment, a connecting hole 43 is jointly formed by the piston cover plate 32, the piston 20 and the first half-ring block 40 or the second half-ring block 41. When the first half-ring block 40 and the second half-ring block 41 approach and abut against the outer wall of the pull rod 3, and the piston cover plate 32 abuts against the side walls of the pull rod 3 and the half-ring block, a locking member 430 can pass through the connecting hole 43, so that the piston nut 4 and the piston cover plate 32 are both fixedly connected to the piston 20. It should be noted that the locking member 430 in this solution can be replaced by other connecting components such as bolts and screws, and the connecting hole 43 can be a threaded hole.

[0032] Preferably, as Figure 1 shown, an oil cylinder rear cover 21 is further connected to the oil cylinder 2 in this embodiment. The oil cylinder rear cover 21 can also be installed on the oil cylinder 2 by using connecting components such as bolts and screws. On the one hand, it has a sealing effect on the piston 20 and the half-ring block, and on the other hand, a displacement sensor 210 can be installed on the oil cylinder rear cover 21 to accurately record the stroke of the oil cylinder 2 by using the displacement sensor 210.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, in the present utility model, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In the present utility model, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

Claims

1. An installation structure assembly of a clamping cylinder of a two-platen injection molding machine, characterized in that, include: Fixed template; An oil cylinder is provided on the fixed template, and a piston is arranged in the oil cylinder; A pull rod, the pull rod passing through the fixed template and the piston, a plurality of first annular teeth spaced apart along the axial direction of the end of the pull rod, and a first annular groove formed between two adjacent first annular teeth; A piston nut is detachably connected to the piston, wherein the inner wall of the piston nut is provided with a plurality of second annular teeth spaced apart along its axial direction, and a second annular groove is formed between two adjacent second annular teeth. When the first annular tooth or the second annular tooth is movably engaged with the second annular groove or the first annular groove, a clearance cavity can be formed in the piston nut or the pull rod, respectively. The piston nut can be movably engaged with the second annular groove by the first annular tooth. When the second annular tooth is movably engaged with the first annular groove, it is connected to the pull rod to fix the piston nut on the oil cylinder.

2. The installation structure assembly of the clamping cylinder of a two-platen injection molding machine according to claim 1, characterized in that The piston nut includes a first half-ring block and a second half-ring block. The second annular teeth and the second annular groove are distributed on the inner walls of the first half-ring block and the second half-ring block, so that the first half-ring block and the second half-ring block can be tightly attached to the pull rod when they approach each other.

3. The installation structure assembly of the clamping cylinder of a two-platen injection molding machine according to claim 1, characterized in that, The inner wall of the relief cavity is formed with an arc transition surface.

4. The installation structure assembly of the clamping cylinder of a two-platen injection molding machine according to claim 2, characterized in that, The end of the pull rod is movably pressed against the piston cover plate, and an anti-slip block is formed at the periphery of the piston cover plate. Positioning grooves are formed at the ends of the first half-ring block and the second half-ring block away from the piston, and the anti-slip block is movably pressed against the positioning groove to limit displacement between the first half-ring block and the second half-ring block.

5. The installation structure assembly of the clamping cylinder of a two-platen injection molding machine according to claim 4, characterized in that, The piston cover plate, the piston and the first half ring block or the second half ring block are jointly formed with a connecting hole, and the connecting hole allows a locking member to pass through, so that the piston nut is connected to the piston.

6. The installation structure assembly of the clamping cylinder of a two-platen injection molding machine according to claim 1, characterized in that, The oil cylinder is also connected to a rear cover of the oil cylinder, and a displacement sensor for recording the stroke of the oil cylinder can be installed on the rear cover of the oil cylinder.

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