Direct-pressure mold locking device of injection molding machine

Abstract

The utility model discloses a direct pressure mould locking device of an injection molding machine, which relates to the field of injection molding machines and is characterized by comprising a tail plate and a second plate, a piston rod penetrating through the tail plate is fixedly mounted on one side, facing the tail plate, of the second plate, a band-type brake mechanism for limiting the piston rod is mounted on the tail plate, and the band-type brake mechanism comprises a limiting external thread and a limiting external thread, the piston is arranged on the piston rod; limiting internal threads matched with the limiting external threads are arranged on the inner concave surfaces of the two semicircular pieces; and the driving assembly is used for driving the two semicircular parts to be radially closed or radially separated. Under the action of the driving assembly, the limiting internal thread and the limiting external thread can be driven to be meshed with each other, so that acting force generated by pressure axially acts on the piston rod, the piston rod can be firmly locked through thread meshing, the mold locking effect is improved, the stress area can be increased through matching of multiple circles of threads, and the service life of the piston rod is prolonged. Pressure concentration is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of injection molding machines, and more specifically, to a direct pressure mold locking device for an injection molding machine. Background Art

[0002] Injection molding machine is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastic materials or thermosetting materials. Therefore, the role of the mold in the injection molding machine is relatively important. The mold of the injection molding machine includes a movable platen and a fixed platen. The production of the product is achieved through the cooperation of the movable platen and the fixed platen. During the injection molding process, the injection molding system will have a very high pressure when injecting material into the mold cavity. Therefore, in actual production, it is necessary to add a clamping device to ensure that the movable platen and the fixed platen are installed with each other to form a fixed mold cavity.

[0003] The clamping mechanism disclosed in the Chinese patent with publication number CN208035284U has the following technical features: it includes: a head plate; multiple tie rods; a movable plate, which defines a space for clamping the mold between the movable plate and the head plate; a tail plate; a hinge assembly, which is hinged to the tail plate; and a hydraulic cylinder, whose piston rod passes through the tail plate and is connected to the hinge assembly, and the hydraulic cylinder is used to drive the movable plate towards or away from the head plate.

[0004] Most of the existing technologies use machine hinge assemblies to achieve mold locking. However, since the two ends of the machine hinge assembly are hinged to the head plate and the movable plate respectively through pins, during actual use, the stress will be concentrated at the hinge position due to the action of huge pressure, causing the pin or machine hinge assembly at the hinge position to crack and deform, and thus cannot be used anymore. Utility Model Content

[0005] The purpose of the utility model is to provide a direct pressure clamping device for an injection molding machine in order to solve the above-mentioned problems.

[0006] The above technical objectives of the present utility model are achieved through the following technical solutions: a direct pressure clamping device for an injection molding machine, comprising a tail plate and two plates, wherein a piston rod passing through the tail plate is fixedly installed on the side of the two plates facing the tail plate, and a brake mechanism for limiting the piston rod is installed on the tail plate, and the brake mechanism comprises: a limiting external thread, which is arranged on the piston rod; two semicircular parts, which are slidably connected to the tail plate and are arranged in a circular array on the piston rod, and a limiting internal thread matching the limiting external thread is arranged on the inner concave surfaces of the two semicircular parts; a drive assembly, which is installed on the semicircular parts, and the drive assembly is used to drive the two semicircular parts to radially close or radially separate.

[0007] Preferably, the two semicircular parts are divided into a first semicircular part and a second semicircular part, and the driving assembly includes: a linkage rod, one end of the linkage rod passes through the first semicircular part and is fixedly mounted to the second semicircular part, and the other end of the linkage rod is fixedly connected to a mounting plate; an oil cylinder, fixedly connected to the mounting plate, the output end of the oil cylinder passes through the mounting plate and is fixedly connected to a linkage block, and the linkage block is fixedly connected to the first semicircular part by a screw.

[0008] Preferably, a track block is fixedly mounted on the side of the tail plate facing the second plate, and track grooves that slide in cooperation with the track block are symmetrically provided on the two semicircular members.

[0009] Preferably, a plane is provided on the semicircular member, and the track groove is provided on the plane.

[0010] Preferably, a guide rod is fixedly mounted on the track block, a slider is fixedly mounted on the guide rod, and a connecting rod is rotatably connected between each of the semicircular members and the slider.

[0011] Preferably, a linear bearing is fixedly mounted on the guide rod, and the slider is fixedly mounted on the linear bearing.

[0012] Preferably, both ends of the connecting rod are provided with through holes, and a pin with a screw hole is rotatably connected in the through hole, and the pin is fixedly connected to the semicircular piece or the slider by screws.

[0013] Preferably, there are two track blocks, which are distributed up and down.

[0014] In summary, the present invention has the following beneficial effects:

[0015] The utility model can drive the limiting internal thread and the limiting external thread to engage with each other under the action of the driving component, so that the force generated by the pressure acts axially on the piston rod. The thread engagement can achieve a firm locking of the piston rod, thereby improving the mold locking effect. Moreover, the cooperation between multiple turns of thread can increase the force area, reduce pressure concentration, and increase service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a structural diagram of the tail plate and brake mechanism in the utility model;

[0018] Figure 3 This is a cross-sectional view of the tail plate and brake mechanism in the utility model;

[0019] Figure 4 This is a cross-sectional view of the piston rod and brake mechanism in the utility model;

[0020] Figure 5 It is a structural diagram of the brake mechanism in the utility model.

[0021] Figure numerals: 1. Tail plate; 2. Second plate; 31. First semicircular member; 32. Second semicircular member; 33. Mounting hole; 34. Limiting internal thread; 35. Track groove; 36. Plane; 4. Track block; 41. Slider; 42. Connecting rod; 43. Guide rod; 44. Linear bearing; 45. Pin; 5. Piston rod; 51. Limiting external thread; 6. Drive assembly; 61. Linkage rod; 611. Bolt; 62. Mounting plate; 63. Cylinder; 64. Linkage block. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1-Figure 5 As shown, a direct pressure clamping device for an injection molding machine includes a tail plate 1 and a second plate 2. A piston rod 5 passing through the tail plate 1 is fixedly installed on the second plate 2 facing the side of the tail plate 1. The movement of the piston rod 5 drives the second plate 2 to move along the axial direction of the piston rod 5. A brake mechanism for limiting the piston rod 5 is installed on the tail plate 1. The brake mechanism includes a limiting external thread 51 set on the side of the piston rod 5, two semicircular parts slidably connected to the tail plate 1, and a drive assembly 6 installed on the semicircular parts. The two semicircular parts are arranged in a circular array on the piston rod 5. On the rod 5, the inner concave surfaces of the two semicircular parts are provided with a limiting internal thread 34 that matches the limiting external thread 51. The driving component 6 is used to drive the two semicircular parts to radially close or separate, thereby driving the limiting internal thread 34 and the limiting external thread 51 to engage with each other, so that the force generated by the pressure acts axially on the piston rod 5. The thread engagement can achieve a firm locking of the piston rod 5, improve the clamping effect, and utilize the cooperation between multiple turns of thread to increase the force area, reduce pressure concentration, and improve service life.

[0024] Furthermore, the two semicircular parts are divided into a first semicircular part 31 and a second semicircular part 32. The driving assembly 6 includes a linkage rod 61 and a cylinder 63. One end of the linkage rod 61 passes through the first semicircular part 31 and is fixedly installed with the second semicircular part 32. The other end of the linkage rod 61 is fixedly connected to the mounting plate 62. The cylinder 63 is fixedly connected to the mounting plate 62. The output end of the cylinder 63 passes through the mounting plate 62 and is fixedly connected to the linkage block 64. The linkage block 64 is fixedly connected to the first semicircular part 31 by screws.

[0025] It is worth mentioning that the first semicircular part 31 and the second semicircular part 32 are provided with mutually aligned mounting holes 33, and a boss is provided in the mounting hole 33 of the second semicircular part 32. One end of the linkage rod 61 passes through the mounting hole 33 of the first semicircular part 31 and enters into the mounting hole 33 of the second semicircular part 32 and abuts against one side of the boss. A bolt 611 is used to pass through the center of the boss from the other side of the boss and is threadedly connected to the linkage rod 61 to achieve fixed installation between the linkage rod 61 and the second semicircular part 32.

[0026] It can be understood that when the piston rod 5 pushes the mold to close, the linkage block 64 is pushed to move under the action of the cylinder 63, thereby driving the first semicircular part 31 to move toward the piston rod 5, and the second semicircular part 32 is pulled to move toward the piston rod 5 under the action of the linkage rod 61, thereby achieving the mutual engagement of the limiting internal thread 34 on the semicircular part and the limiting external thread 51 on the piston rod 5 to achieve locking.

[0027] It is worth mentioning that there are two linkage rods 61 , which are symmetrically distributed up and down, and the two linkage rods 61 are fixedly installed on both ends of the mounting plate 62 respectively.

[0028] Furthermore, a track block 4 is fixedly mounted on the side of the tail plate 1 facing the second plate 2 , and track grooves 35 that slide in cooperation with the track block 4 are symmetrically provided on the two semicircular members.

[0029] It can be understood that since the corresponding track grooves 35 on the two semicircular parts slide together with the same track block 4, the two semicircular parts can move along the track block 4 when closing or separating, ensuring accuracy and stability when closing, so that the limiting external thread 51 and the limiting internal thread 34 can be well matched.

[0030] It is worth mentioning that there are two track blocks 4, which are distributed up and down, which can not only provide stable support for the two semicircular parts, but also serve as axial limiters for them, so that the two semicircular parts can only move horizontally during use, making them more stable to use.

[0031] Furthermore, a plane 36 is provided on the semicircular member, and the track groove 35 is provided on the plane 36, so that most of the groove depths of the track groove 35 are consistent, thereby allowing the track block 4 to have more area to slide in contact with the inner wall of the track groove 35 when in use, thereby enhancing its support stability and movement stability.

[0032] Furthermore, a guide rod 43 is fixedly mounted on the track block 4 , a slider 41 is fixedly mounted on the guide rod 43 , and a connecting rod 42 is rotatably connected between each semicircular member and the slider 41 .

[0033] It can be understood that under the action of the linkage rod 61 and in combination with the movement of the connecting rod 42, the first semicircular member 31 and the second semicircular member 32 can be synchronously moved inward to close or moved outward to separate, which is more convenient to use.

[0034] It is worth mentioning that each track block 4 is provided with a guide rod 43, each guide rod 43 is installed on a slider 41, and each slider 41 is symmetrically provided with two connecting rods 42, that is, two groups of structures are provided, so that the synchronous movement effect of the first semicircular part 31 and the second semicircular part 32 is more stable.

[0035] Furthermore, a linear bearing 44 is fixedly mounted on the guide rod 43 , and the slider 41 is fixedly mounted on the linear bearing 44 , which is convenient for assembly and can better fix the slider 41 .

[0036] Furthermore, through holes are provided at both ends of the connecting rod 42, and a pin 45 with a screw hole is rotatably connected in the through hole. The pin 45 is fixedly connected to the semicircular part or slider 41 by screws, so that the rotation of the connecting rod 42 is smoother, ensuring the synchronization of the movement of the first semicircular part 31 and the second semicircular part 32.

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A direct pressure clamping device for an injection molding machine, characterized in that: The invention comprises a tail plate (1) and a second plate (2), wherein a piston rod (5) passing through the tail plate (1) is fixedly mounted on the second plate (2) on a side facing the tail plate (1), and the tail plate (1) is provided with a brake mechanism for limiting the piston rod (5), and the brake mechanism comprises: A limiting external thread (51) is provided on the piston rod (5); Two semicircular members are slidably connected to the tail plate (1) and are arranged in a circular array on the piston rod (5), and the inner concave surfaces of the two semicircular members are both provided with a limiting internal thread (34) that matches the limiting external thread (51); A drive assembly (6) is mounted on the semicircular member, and the drive assembly (6) is used to drive the two semicircular members to radially close or radially separate.

2. The direct pressure clamping device for an injection molding machine according to claim 1, characterized in that: The two semicircular members are divided into a first semicircular member (31) and a second semicircular member (32), and the driving assembly (6) includes: A linkage rod (61), one end of the linkage rod (61) passes through the first semicircular member (31) and is fixedly mounted to the second semicircular member (32), and the other end of the linkage rod (61) is fixedly connected to a mounting plate (62); The oil cylinder (63) is fixedly connected to the mounting plate (62). The output end of the oil cylinder (63) passes through the mounting plate (62) and is fixedly connected to a linkage block (64). The linkage block (64) is fixedly connected to the first semicircular member (31) via screws.

3. The direct pressure clamping device for an injection molding machine according to claim 1, characterized in that: A track block (4) is fixedly mounted on one side of the tail plate (1) facing the second plate (2), and track grooves (35) that are symmetrically arranged on the two semicircular members and that are in sliding engagement with the track block (4) are provided.

4. The direct pressure clamping device for an injection molding machine according to claim 3, characterized in that: A plane (36) is provided on the semicircular member, and the track groove (35) is provided on the plane (36).

5. The direct pressure clamping device for an injection molding machine according to claim 4, characterized in that: A guide rod (43) is fixedly mounted on the track block (4), a slider (41) is fixedly mounted on the guide rod (43), and a connecting rod (42) is rotatably connected between each semicircular member and the slider (41).

6. The direct pressure clamping device for an injection molding machine according to claim 5, characterized in that: A linear bearing (44) is fixedly mounted on the guide rod (43), and the slider (41) is fixedly mounted on the linear bearing (44).

7. The direct pressure clamping device for an injection molding machine according to claim 5, characterized in that: Both ends of the connecting rod (42) are provided with through holes, and a pin (45) with a screw hole is rotatably connected in the through hole, and the pin (45) is fixedly connected to the semicircular member or the slider (41) by screws.

8. The direct pressure clamping device for an injection molding machine according to claim 3, characterized in that: The track blocks (4) are provided in two pieces and are distributed up and down.

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