Pressing structure of BMC injection molding machine

Abstract

The utility model relates to the technical field of injection molding machines, in particular to a material pressing structure of a BMC (bulk molding compound) injection molding machine, which comprises an injection molding machine base, an injection seat mounted on the injection molding machine base, an interlayer bracket mounted on the injection seat, a material pressing bin mounted in the interlayer bracket, and a material pressing oil cylinder mounted at the upper end of the interlayer bracket, the interlayer support comprises a balance weight plate fixedly installed on the injection base, supporting rods connected to the corner positions of the balance weight plate and fixing plates with holes fixedly installed on the supporting rods, the balance weight plate is provided with a feeding port in butt joint with the injection base, the material pressing bin is arranged on the balance weight plate, the lower end of the material pressing bin is in butt joint with the feeding port, and the material pressing bin is arranged on the injection base. The material pressing oil cylinder is installed on the fixing plate with the holes and provided with a piston push rod which penetrates through the fixing plate with the holes and then is in butt joint with the interior of the material pressing bin. Through the arrangement of the balance weight plate, the overall gravity center can be lowered, and the material pressing bin and the material pressing oil cylinder are arranged through the interlayer support, so that the material pressing bin and the material pressing oil cylinder can be separated from each other.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a material pressing structure of a BMC injection molding machine. Background Art

[0002] BMC is the abbreviation of bulk molding compound. BMC is a molding intermediate material for semi-dry manufacturing of glass fiber reinforced thermosetting products, mostly used for molding and injection molding; the main characteristics of bulk molding glass fiber plastic are light weight, high strength, insulation, corrosion resistance, high utilization rate, high molding rate, stable product quality, easy operation and other advantages. It is widely used in electrical components, auto parts, motor components, daily products and other fields; the pressing structure of the existing BMC injection molding machine is arranged above the pressing bin, the pressing structure includes a pressing cylinder and a piston push rod, the pressing cylinder is arranged just above the pressing bin, the upper end of the piston push rod is connected to the pressing cylinder, and the lower end of the piston push rod extends into the pressing bin. After the hydraulic pump is started, the hydraulic oil in the pressing cylinder pushes the piston push rod downward to realize the pressing action.

[0003] For example, the double-cylinder vertical pressing structure of the BMC injection molding machine described in the invention patent application publication number CN107127931A takes into account a series of problems caused by the prior art pressing cylinder being directly connected above the pressing bin, and thus designs a double-cylinder pressing structure in which two pressing cylinders on both sides of the pressing bin press the materials together. The pressing structure has a low center of gravity, stable operation, small space occupation, and easy installation and maintenance, and can avoid the disadvantage of hydraulic oil leakage in the single-cylinder pressing structure causing contamination of the raw materials in the hopper; however, the use of the double-cylinder pressing structure will increase the equipment cost, and the double-cylinder pressing structure occupies more space. Therefore, it is necessary to propose an improved technical solution to solve the above problems. Utility Model Content

[0004] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0005] A material pressing structure of a BMC injection molding machine comprises an injection molding machine base, an injection seat mounted on the injection molding machine base, a partition bracket mounted on the injection seat, a material pressing bin mounted in the partition bracket, and a material pressing oil cylinder mounted on the upper end of the partition bracket, wherein the partition bracket comprises a counterweight plate fixedly mounted on the injection seat, a support rod connected to the corner position of the counterweight plate, and a fixed plate with holes fixedly mounted on the support rod, a material feed port docked with the injection seat is arranged on the counterweight plate, the material pressing bin is arranged on the counterweight plate, and the lower end of the material pressing bin docks with the material feed port, the material pressing oil cylinder is mounted on the fixed plate with holes, and the material pressing oil cylinder has a piston push rod that passes through the fixed plate with holes and docks in the material pressing bin.

[0006] Preferably, threaded ends are extended from both ends of the support rod, and fixing holes docked with the threaded ends are provided on the counterweight plate and the fixed plate with holes. Two nut parts are provided on each threaded end, and the support rod is fixedly connected to the counterweight plate and the fixed plate with holes through the nut parts.

[0007] Preferably, the injection seat has a lifting frame at the lower end, an injection part in the middle and a sealing docking table at the upper end. An injection channel and an extrusion channel docked with the injection channel are provided inside the injection part. The extrusion channel runs through the upper end of the injection seat along the sealing docking table, and the extrusion channel is sealed and docked with the feed port through the sealing docking table.

[0008] Preferably, a paving portion for accommodating a nut member is provided at a corner of the sealing docking table.

[0009] Preferably, the pressing bin includes a pressing barrel, a counterweight flange arranged at the lower end of the pressing barrel, and an eccentric reducing sleeve sealingly connected to the upper end of the pressing barrel. The piston push rod passes through the eccentric reducing sleeve to connect with the pressing barrel. The eccentric reducing sleeve has an exposed discharge port, and the discharge port is covered with a flip cover. The pressing barrel is sealed and connected to the feed port on the counterweight plate through the counterweight flange.

[0010] Preferably, the interlayer bracket is also provided with a plurality of side plates, which are fixed around the counterweight plate and the fixed plate with holes, and the discharge port is exposed from the side plates.

[0011] Preferably, a toggle piece is formed on one side of the flip cover, and a travel switch docked with the toggle piece is installed on the side plate.

[0012] Preferably, a first step is formed on the outer side of the lower end of the pressing barrel, a second step is also formed at the lower end of the first step, a sealing ring groove docking with the second step is provided at the edge of the feed port, and the counterweight flange is interference fit with the first step.

[0013] Preferably, the feed inlet is a funnel-shaped structure.

[0014] Preferably, a line transfer module is provided on the side of the injection seat, and the pressing cylinder and the travel switch are wired through the line transfer module.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] A bulkhead bracket is provided to separately install the material pressing bin and the material pressing cylinder, and the bulkhead bracket is provided with a counterweight plate docked to the injection seat, and then a support rod is provided to install the fixed plate with holes on top of the counterweight plate, so that a space for installing the material pressing bin is formed between the counterweight plate and the fixed plate with holes, and the fixed plate with holes is used to install the material pressing cylinder. The setting of the counterweight plate can lower the overall center of gravity, and the bulkhead bracket is used to install the material pressing bin and the material pressing cylinder, so that the material pressing bin and the material pressing cylinder can be separated independently, reducing the force on the material pressing bin and facilitating the disassembly, replacement, cleaning and other operations of the material pressing bin.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 It is a half-section structural schematic diagram of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the utility model after the base and side panels of the injection machine are removed;

[0022] Figure 4 It is a structural schematic diagram of the intermediate layer bracket of the utility model;

[0023] Figure 5 It is a structural schematic diagram of the injection seat in the utility model;

[0024] Figure 6 It is a schematic diagram of the structure between the medium-pressure barrel and the counterweight flange of the utility model.

[0025] The reference numerals and names in the figures are as follows:

[0026] Injection machine base 10, injection seat 20, lifting frame 21, injection part 22, sealing docking table 23, injection channel 24, extrusion channel 25, give way part 26, transfer module 27, interlayer bracket 30, counterweight plate 31, support rod 32, fixed plate with holes 33, feed port 34, threaded end 35, fixing hole 36, nut 37, side plate 38, travel switch 39, pressing bin 40, pressing barrel 41, counterweight flange 42, eccentric reducer 43, discharge port 44, flip cover 45, toggle member 46, first step 47, second step 48, pressing cylinder 50, piston push rod 51. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-6 In the embodiment of the utility model, a BMC injection molding machine pressing structure includes an injection molding machine base 10, an injection seat 20 installed on the injection molding machine base, a partition bracket 30 installed on the injection seat 20, a pressing bin 40 installed in the partition bracket 30, and a pressing oil cylinder 50 installed on the upper end of the partition bracket 30. The partition bracket 30 includes a counterweight plate 31 fixedly installed on the injection seat 20, a support rod 32 connected to the corner position of the counterweight plate 31, and a fixed plate 33 with holes fixedly installed on the support rod 32. The counterweight plate 31 is provided with a feed port 34 docked with the injection seat 20. The pressing bin 40 is arranged on the counterweight plate 31, and the lower end of the pressing bin 40 is docked with the feed port 34. The pressing oil cylinder 50 is installed on the fixed plate 33 with holes. The pressing oil cylinder 50 has a function of passing through the fixed plate 33 with holes and docking with the The piston push rod 51 in the pressing bin 40; in the above technical scheme, a partition bracket 30 is provided to respectively install the pressing bin 40 and the pressing cylinder 50, and the partition bracket 30 is provided with a counterweight plate 31 docked to the injection seat 20, and then the fixed plate 33 with holes is installed on the top of the counterweight plate 31 by providing a support rod 32, so that a space for installing the pressing bin 40 is formed between the counterweight plate 31 and the fixed plate 33 with holes, and the fixed plate 33 with holes is used to install the pressing cylinder 50. By providing the counterweight plate 31, the overall center of gravity can be lowered, and the pressing bin 40 and the pressing cylinder 50 are installed by the partition bracket 30, so that the pressing bin 40 and the pressing cylinder 50 can be separated independently, which reduces the force on the pressing bin 40 and also facilitates the disassembly, replacement, cleaning and other operations of the pressing bin 40.

[0029] See also Figure 2-5In this embodiment, threaded ends 35 are extended and formed at both ends of the support rod 32, and fixing holes 36 that are docked with the threaded ends 35 are provided on the counterweight plate 31 and the fixed plate 33 with holes. Two nut members 37 are provided on each threaded end 35, and the support rod 32 is fixedly connected to the counterweight plate 31 and the fixed plate 33 with holes through the nut members 37, so that the overall assembly between the partitions is convenient, firm and reliable; the injection seat 20 has a lifting frame 21 at the lower end, an injection part 22 in the middle and a sealing docking table 23 at the upper end, and the lifting frame 21 is used for raising the setting so that the injection part 22 can be connected to the injection screw of the injection molding machine. The injection part 22 is provided with an injection channel 24 and an extrusion channel 25 connected to the injection channel 24. The extrusion channel 25 runs through the upper end of the injection seat 20 along the sealing docking table 23, and the extrusion channel 25 is sealed and connected with the feed port 34 through the sealing docking table 23; the corner position of the sealing docking table 23 is provided with a makeshift portion 26 for accommodating the nut member 37, so that the overall structure is compact, firm and reliable.

[0030] See also Figure 2 , Figure 3 and Figure 6 In this embodiment, the pressing bin 40 includes a pressing barrel 41, a counterweight flange 42 arranged at the lower end of the pressing barrel 41, and an eccentric reducing sleeve 43 sealed and connected to the upper end of the pressing barrel 41. The piston push rod 51 passes through the eccentric reducing sleeve 43 to connect with the pressing barrel 41. The eccentric reducing sleeve 43 has an exposed discharge port 44, and the discharge port 44 is covered with a flip cover 45. The pressing barrel 41 is sealed and connected to the feed port 34 on the counterweight plate 31 through the counterweight flange 42. In terms of design, a flange can also be used between the eccentric reducing sleeve 43 and the pressing barrel 41. The discharge port 44 is set up with an integrated structure and an eccentric reducer sleeve 43. The discharge port 44 has a simple structure and a low manufacturing cost. When discharging, the piston push rod 51 rises to a height higher than the eccentric reducer sleeve 43, and then the lump mold material is placed in and the equipment is started. The pressing cylinder 50 drives the piston push rod 51 to squeeze the lump mold material placed in the pressing bin 40 into the injection seat 20 according to the set flow rate. In addition, the pressing cylinder 41 and the counterweight flange 42 are designed in a split manner to increase the weight of the lower end of the pressing bin 40, thereby further achieving the purpose of lowering the center of gravity.

[0031] See also Figure 1-3 In this embodiment, the interlayer bracket 30 is also provided with a plurality of side panels 38, and the plurality of side panels 38 are fixed around the counterweight plate 31 and the fixed plate 33 with holes, and the discharge port 44 is exposed from the side panel 38, which can play a closed protection and consolidation role for the pressing bin 40; a toggle member 46 is formed on one side of the flip cover 45, and a travel switch 39 connected to the toggle member 46 is installed on the side panel 38, so that after the discharge, the corresponding operation can be automatically controlled by the travel switch 39, so that the control can be more convenient, and it can also detect whether the flip cover 45 is closed during operation.

[0032] See also Figure 4 and Figure 6 In this embodiment, a first step 47 is formed on the outer side of the lower end of the pressing barrel 41, and a second step 48 is also formed on the lower end of the first step 47. A sealing ring groove (not shown) is provided at the edge of the feed port 34 and docked with the second step 48. The counterweight flange 42 is interference fit with the first step 47. The feed port 34 is a funnel-shaped structure, which can achieve the effect of converging the bulk mold material.

[0033] See also Figure 1-3 In this embodiment, a transfer module 27 is provided on the side of the injection seat 20, and the pressing cylinder 50 and the travel switch 39 are wired through the transfer module 27. The wiring can be more regular, and the pressing structure of the injection molding machine can be made into a single module. During the installation process, the pressing cylinder 50 and the travel switch 39 or other power supply and gas supply pipelines are connected to the transfer module 27 in advance. After the pressing structure of the injection molding machine is assembled on the injection molding machine, the wiring can be directly performed at the position of the dedicated line module, and its operation convenience is greatly improved.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A material pressing structure of a BMC injection molding machine, characterized in that: It includes an injection molding machine base, an injection seat installed on the injection molding machine base, a partition bracket installed on the injection seat, a pressing bin installed in the partition bracket, and a pressing oil cylinder installed on the upper end of the partition bracket. The partition bracket includes a counterweight plate fixedly installed on the injection seat, a support rod connected to the corner position of the counterweight plate, and a fixed plate with holes fixedly installed on the support rod. The counterweight plate is provided with a feed port docked with the injection seat. The pressing bin is installed on the counterweight plate, and the lower end of the pressing bin is docked with the feed port. The pressing oil cylinder is installed on the fixed plate with holes. The pressing oil cylinder has a piston push rod that passes through the fixed plate with holes and docks in the pressing bin.

2. A BMC injection molding machine material pressing structure according to claim 1, characterized in that: Threaded ends are extended at both ends of the support rod, and fixing holes that dock with the threaded ends are provided on the counterweight plate and the fixed plate with holes. Two nut pieces are provided on each threaded end, and the support rod is fixedly connected to the counterweight plate and the fixed plate with holes through the nut pieces.

3. A BMC injection molding machine material pressing structure according to claim 2, characterized in that: The injection seat has a lifting frame at the lower end, an injection part in the middle and a sealing docking table at the upper end. An injection channel and an extrusion channel docked with the injection channel are provided inside the injection part. The extrusion channel runs through the upper end of the injection seat along the sealing docking table, and the extrusion channel is sealed and docked with the feed port through the sealing docking table.

4. A material pressing structure for a BMC injection molding machine according to claim 3, characterized in that: A paving portion for accommodating a nut piece is provided at the corner position of the sealing butt joint table.

5. The material pressing structure of a BMC injection molding machine according to claim 1, characterized in that: The pressing bin includes a pressing barrel, a counterweight flange arranged at the lower end of the pressing barrel, and an eccentric reducing sleeve sealingly connected to the upper end of the pressing barrel. The piston push rod passes through the eccentric reducing sleeve to connect with the pressing barrel. The eccentric reducing sleeve has an exposed discharge port, and the discharge port is covered with a flip cover. The pressing barrel is sealed and connected to the feed port on the counterweight plate through the counterweight flange.

6. A material pressing structure for a BMC injection molding machine according to claim 5, characterized in that: The interlayer bracket is also provided with a plurality of side plates, which are fixed around the counterweight plate and the fixed plate with holes, and the discharge port is exposed from the side plates.

7. A material pressing structure for a BMC injection molding machine according to claim 6, characterized in that: A toggle piece is formed on one side of the flip cover, and a travel switch connected to the toggle piece is installed on the side plate.

8. The material pressing structure of a BMC injection molding machine according to claim 5, characterized in that: A first step is formed on the outer side of the lower end of the pressing barrel, and a second step is also formed on the lower end of the first step. A sealing ring groove docking with the second step is provided on the edge of the feed port, and the counterweight flange is interference fit with the first step.

9. A material pressing structure for a BMC injection molding machine according to claim 1, characterized in that: The feed inlet is a funnel-shaped structure.

10. A material pressing structure for a BMC injection molding machine according to claim 7, characterized in that: A line transfer module is arranged on the side of the injection seat, and the pressing cylinder and the travel switch are wired through the line transfer module.

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