A vertical injection frame for plastic products used on a hydraulic machine and an injection molding method

Abstract

The present application belongs to the technical field of injection molding production equipment, and particularly relates to a vertical injection frame for plastic products used on a hydraulic machine and an injection molding method. The vertical injection frame for plastic products used on the hydraulic machine comprises a pressurizing mechanism, a material containing mechanism and a supporting mechanism. The bottom of the pressurizing mechanism is movably connected to the material containing mechanism, and the material containing mechanism is movably connected to the supporting mechanism. The vertical injection frame for plastic products used on the hydraulic machine is connected and fixed to a hydraulic machine, so that the ordinary hydraulic machine is transformed into a vertical injection molding equipment to realize vertical injection molding. After the vertical injection frame for plastic products is removed, the normal use of the hydraulic machine is not affected, and the ordinary hydraulic machine is used in multiple ways. The present application has simple structure, is convenient to disassemble, assemble and operate, has small floor space and is easy to carry, and is particularly suitable for producing small multi-embedded injection molding products.

Description

Technical Field

[0001] This invention belongs to the technical field of injection molding production equipment, specifically relating to a vertical injection frame for plastic products used on a hydraulic press and an injection molding method. Background Technology

[0002] The equipment commonly used for injection molding of plastic products is the injection molding machine. Injection molding machines are further divided into horizontal injection molding machines and vertical injection molding machines. In actual production, some small or micro-sized plastic products, especially those with small inserts that require positioning, are very convenient to produce using a vertical injection molding machine because the mold surface faces upwards, making it easier to place and position the inserts, which is something that horizontal injection molding machines cannot surpass.

[0003] However, when it is necessary to injection mold a very small quantity of products with tiny inserts, existing horizontal injection molding machines cannot meet the production requirements, and vertical injection molding machines are lacking on-site. However, there is a spare three-beam four-column hydraulic press, typically used for plastic product compression molding, with a capacity of approximately 45 tons, available on-site but not yet in use. Therefore, it is necessary to fully utilize the existing resources of the hydraulic press in its standby state to replace the vertical injection molding machine and perform its vertical injection molding function to complete the injection molding production of very small quantities of products with tiny inserts. Summary of the Invention

[0004] This invention provides a vertical injection frame for plastic products used on a hydraulic press and an injection molding method, with the aim of providing a device and method that can cooperate with a hydraulic press to achieve vertical injection molding function.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A vertical injection molding machine for plastic products used on a hydraulic press includes at least a hydraulic press, and also includes a pressurizing mechanism, a material holding mechanism, and a supporting mechanism; the bottom of the pressurizing mechanism is movably connected to the material holding mechanism, and the material holding mechanism is movably connected to the supporting mechanism; the top of the pressurizing mechanism is detachably connected to the movable crossbeam table of the hydraulic press, and the supporting mechanism is detachably connected to the table of the hydraulic press; a heating mechanism is provided on the material holding mechanism.

[0007] The pressurizing mechanism includes an upper fixed plate, an upper pad plate, a long pressure rod, an upper support rod, and a copper pressure head. The length of the long pressure rod is less than the length of the upper support rod. The top end of the long pressure rod is connected to the center of the upper surface of the upper pad plate, and the bottom end of the long pressure rod passes vertically through the upper pad plate and is positioned below the upper pad plate. The bottom end of the long pressure rod is detachably connected to the copper pressure head. Two upper support rods are provided, symmetrically arranged on both sides of the long pressure rod. The top end of each upper support rod is connected to the upper surface of the upper pad plate, and the bottom end of each upper support rod passes vertically through the upper pad plate and is movably connected to the material holding mechanism. The bottom end of each upper support rod is connected to a nut for fixing to the material holding mechanism. The upper fixed plate is detachably connected to the upper surface of the upper pad plate.

[0008] The long pressure rod is an integral structure composed of three cylinders with successively decreasing outer diameters: upper, middle, and lower. The upper cylinder overlaps the upper surface of the upper pad, and the outer side wall of the lower cylinder is provided with threads for connecting to the copper pressure head. The outer diameter of the middle cylinder is smaller than the outer diameter of the copper pressure head. The upper support rod is cylindrical, with a boss at its top and threads for connecting nuts on its bottom side wall.

[0009] Both the upper pad and the upper fixing plate are rectangular steel plates. The upper pad has a first shoulder hole at its center for connecting a long pressure rod. Four first threaded holes are formed around the first shoulder hole to connect the upper pad and the upper fixing plate. These four first threaded holes are located at the four corners of a square centered on the first shoulder hole. Second shoulder holes for connecting upper support rods are symmetrically formed on the left and right sides of the first shoulder hole. Two first U-shaped grooves are formed on each of the two opposite sides of the upper pad. The upper fixing plate has the same dimensions as the upper pad. Second threaded holes are formed on the upper fixing plate at positions corresponding to the four first threaded holes, and second U-shaped grooves are formed at positions corresponding to the first U-shaped grooves. The first and second U-shaped grooves are used for bolts to pass through when connecting to the hydraulic press.

[0010] The copper pressure head is a copper cylinder with a circular groove at the center of its upper part that opens at the top. The inner wall of the groove is provided with threads for connecting to the bottom end of the long pressure rod.

[0011] The material holding mechanism includes a tray, a feeding cylinder, and an injection nozzle; the upper part of the feeding cylinder is detachably connected to the tray, and the bottom end of the feeding cylinder is detachably connected to the injection nozzle; a heating mechanism is connected to the outer wall of the feeding cylinder; and the tray is connected to a pressurizing mechanism.

[0012] The feeding cylinder is a hollow cylinder with open top and bottom. A raised ring for connection to the support plate is provided on the outer wall of the upper end of the feeding cylinder, and a first connecting hole is opened on the raised ring. A shoulder is provided on the inner wall of the lower end of the feeding cylinder, and a thread for connection to the injection nozzle is provided on the side wall of the shoulder. The heating mechanism is an electric heating coil, which is circumferentially connected to the feeding cylinder. A feeding cylinder connecting hole is provided at the center of the support plate, and six centrally symmetrical second connecting holes, two left-right symmetrical upper support rod holes, and four centrally symmetrical lower support rod holes are opened from the inside to the outside of the feeding cylinder connecting hole.

[0013] The injection nozzle is an integral structure consisting of three cylindrical sections with different outer diameters (upper, middle, and lower) and a hemisphere at the lower end. The outer diameter of the middle cylindrical section is larger than that of the lower cylindrical section, the outer diameter of the lower cylindrical section is larger than that of the upper cylindrical section, and the diameter of the hemisphere is smaller than that of the upper cylindrical section. The outer wall of the upper cylindrical section is provided with threads for connection to the feeding cylinder. The upper part of the inner cavity of the injection nozzle is a circular cavity, and the lower part is a frustum-shaped cavity that is larger at the top and smaller at the bottom. The bottom end of the frustum-shaped cavity is the discharge port.

[0014] The support mechanism includes lower support rods, a lower pad, and a lower fixing plate; four lower support rods are provided, and the four lower support rods are vertically connected to the lower pad; the lower fixing plate is detachably connected to the lower surface of the lower pad; the material holding mechanism is vertically movable and connected to the four lower support rods, and the top ends of the four lower support rods pass through the material holding mechanism and are connected to nuts.

[0015] An injection molding method for a vertical injection frame for plastic products on a hydraulic press, comprising the following steps:

[0016] Step 1: Place the vertical injection frame for plastic products used on the hydraulic press onto the hydraulic press table. After adjusting the position, fix the upper fixed plate on the pressurizing mechanism to the moving crossbeam table of the hydraulic press.

[0017] Step 2: Start the hydraulic press so that the long pressure rod on the pressurizing mechanism, together with the copper pressure head, can move freely up and down inside the feeding cylinder of the material holding mechanism;

[0018] Step 3: With the copper pressure head inserted into the feeding cylinder at 1 / 2 height, fix the lower fixed plate in the support mechanism to the hydraulic press table;

[0019] Step 4: Start the hydraulic press, raise the pressurizing mechanism, add the plastic raw material into the feeding cylinder in the support mechanism, and turn on the power to the heating coil to start heating;

[0020] Step 5: Place the mold to be injected directly below the injection nozzle in the material feeding mechanism, aligning it with the sprue;

[0021] Step Six: Operate the hydraulic press to make the pressure mechanism move downward. The copper pressure head on the pressure mechanism enters the feeding cylinder and applies pressure to the heated molten plastic in the feeding cylinder. The pressurized molten plastic is injected into the mold through the discharge port at the bottom of the injection nozzle.

[0022] Step 7: After the pressure holding time is preset, operate the hydraulic press to make the pressure mechanism move upward, driving the copper pressure head to be pulled out of the feeding cylinder; then, the upper support rod in the pressure mechanism pulls the material holding mechanism upward, thereby driving the tray and feeding cylinder in the material holding mechanism to move upward, and take out the mold, thus completing the injection molding.

[0023] Beneficial effects:

[0024] (1) The vertical injection molding machine for plastic products in this invention includes a pressurizing mechanism, a material holding mechanism, and a supporting mechanism; the bottom of the pressurizing mechanism is vertically and movably connected to the material holding mechanism, and the material holding mechanism is vertically and movably connected to the supporting mechanism. By connecting and fixing the vertical injection molding machine for plastic products to a hydraulic press, this invention can transform an ordinary hydraulic press into a vertical injection molding machine to achieve vertical injection molding. After removing the vertical injection molding machine for plastic products, the normal use of the hydraulic press will not be affected, thus realizing the multi-purpose use of an ordinary hydraulic press.

[0025] (2) The present invention has a simple structure, is easy to disassemble and operate, occupies a small area, and is easy to transport. It is especially suitable for producing small multi-insert injection molded products.

[0026] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a top view of the upper fixed plate structure in this invention.

[0030] Figure 3 This is a cross-sectional view of the upper fixed plate structure in this invention.

[0031] Figure 4 This is a top view of the upper pad structure in this invention.

[0032] Figure 5 This is a cross-sectional view of the upper pad structure in this invention.

[0033] Figure 6 This is a schematic cross-sectional view of the long pressure bar in this invention.

[0034] Figure 7 This is a schematic cross-sectional view of the copper pressure head in this invention.

[0035] Figure 8 This is a cross-sectional view of the feeding cylinder in this invention.

[0036] Figure 9 This is a schematic cross-sectional view of the nozzle in this invention.

[0037] Figure 10 This is a top view of the pallet structure in this invention.

[0038] Figure 11 This is a cross-sectional view of the pallet in this invention.

[0039] In the diagram: 1. Upper fixing plate; 2. Upper pad; 3. Screw; 4. Long pressure rod; 5. Upper support rod; 6. Copper pressure head; 7. Nut; 8. Support plate; 9. Lower support rod; 10. Thermocouple; 11. Heating coil; 12. Feeding cylinder; 13. Injection nozzle; 14. Lower pad; 15. Lower fixing plate; 16. Lower support rod hole; 17. Upper support rod hole; 18. First shoulder hole; 19. First threaded hole; 20. Second shoulder hole; 21. Second threaded hole; 22. First U-groove; 23. Second U-groove; 24. Temperature measuring port; 25. Protruding ring; 26. First connecting hole; 27. Shoulder; 28. Discharge port; 29. ​​Feeding cylinder connecting hole; 30. Second connecting hole. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1:

[0042] according to Figure 1 The illustrated vertical injection molding machine for plastic products used on a hydraulic press includes at least a hydraulic press, as well as a pressurizing mechanism, a material holding mechanism, and a support mechanism. The bottom of the pressurizing mechanism is vertically movably connected to the material holding mechanism, and the material holding mechanism is vertically movably connected to the support mechanism. The top of the pressurizing mechanism is detachably connected to the movable crossbeam platform on the hydraulic press, and the support mechanism is detachably connected to the platform of the hydraulic press. A heating mechanism is provided on the material holding mechanism.

[0043] In practical use, first, place the vertical injection molding rack for plastic products onto the hydraulic press table. After adjusting the position, fix the upper fixed plate 1 on the pressurizing mechanism to the movable crossbeam table of the hydraulic press. Then, start the hydraulic press to allow the bottom of the pressurizing mechanism to move freely up and down within the material holding mechanism. Next, adjust the pressurizing mechanism until its bottom is halfway inside the material holding mechanism, and then fix the bottom surface of the support mechanism to the hydraulic press table. After that, start the hydraulic press to raise and reset the pressurizing mechanism and the material holding mechanism, add the plastic raw material into the material holding mechanism, and turn on the heating mechanism to process the plastic raw material. Heating is performed; at this time, the mold to be injected is placed on the support mechanism, and the injection port of the mold is aligned with the bottom of the material receiving mechanism; then the hydraulic press is operated to make the pressure mechanism move downward, so that the bottom end of the pressure mechanism enters the material receiving mechanism, and pressure is applied to the heated and molten plastic in the material receiving mechanism. The molten plastic under pressure enters the mold through the bottom end of the material receiving mechanism; after holding the pressure for a preset time, the hydraulic press is operated to make the pressure mechanism move upward, so that the bottom end of the pressure mechanism is pulled out of the material receiving mechanism; then, the pressure mechanism pulls the material receiving mechanism upward, thereby driving the material receiving mechanism to move upward and remove the mold, thus completing the injection molding.

[0044] This invention connects and fixes a vertical injection frame for plastic products to a hydraulic press, thereby transforming an ordinary hydraulic press into a vertical injection molding machine to achieve vertical injection molding. Removing the vertical injection frame for plastic products will not affect the normal use of the hydraulic press, thus realizing the multi-purpose use of an ordinary hydraulic press.

[0045] This invention has a simple structure, is easy to assemble and disassemble and operate, occupies a small area, and is easy to transport. It is especially suitable for producing small multi-insert injection molded products.

[0046] Example 2:

[0047] according to Figures 1-7 The vertical injection molding machine for plastic products shown in the hydraulic press differs from Embodiment 1 in that: the pressurizing mechanism includes an upper fixed plate 1, an upper pad 2, a long pressure rod 4, an upper support rod 5, and a copper pressure head 6; the length of the long pressure rod 4 is less than the length of the upper support rod 5; the top end of the long pressure rod 4 is connected to the center of the upper surface of the upper pad 2, and the bottom end of the long pressure rod 4 passes vertically through the upper pad 2 and is positioned below the upper pad 2; the bottom end of the long pressure rod 4 is detachably connected to the copper pressure head 6; two upper support rods 5 are provided, symmetrically arranged on both sides of the long pressure rod 4; the top end of each upper support rod 5 is connected to the upper surface of the upper pad 2, and the bottom end of each upper support rod 5 passes vertically through the upper pad 2 and is movably connected to the material holding mechanism; the bottom end of each upper support rod 5 is connected to a nut for fixing to the material holding mechanism; the upper fixed plate 1 is detachably connected to the upper surface of the upper pad 2.

[0048] In actual use, the lower end of the upper support rod 5 passes through the tray 8 on the material holding mechanism and is then fixed by a nut.

[0049] In practical application, firstly, the entire vertical injection molding machine for plastic products is placed on the hydraulic press table. After adjusting the position, the upper fixed plate 1 is fixed to the movable crossbeam table of the hydraulic press. The hydraulic press is then started, causing the movable crossbeam table to rise. The upper fixed plate 1, fixed to the movable crossbeam table, rises accordingly. Driven by the upper fixed plate 1, the two upper support rods 5 move up and down within the two upper support rod holes 17 of the support plate 8, allowing the long pressure rod 4 and the copper pressure head 6 to move freely up and down within the feeding cylinder 12 of the material handling mechanism. Then, the copper pressure head 6 is adjusted to half its height within the feeding cylinder 12, and the lower fixed plate 15 in the support mechanism is fixed to the hydraulic press table. Finally, the hydraulic press is started. The pressurizing mechanism and the material-filling mechanism are lifted and reset as a whole. Then, plastic raw material is added to the material-filling mechanism and heated. Then, the mold to be injected is placed directly below the injection nozzle 13 in the material-filling mechanism and aligned with the sprue on the mold. The hydraulic press is operated to make the pressurizing mechanism and the material-filling mechanism move downward. The injection nozzle 13 contacts the sprue on the mold. The pressurizing mechanism continues to move downward. The copper pressure head 6 on the pressurizing mechanism enters the feeding cylinder 12 and applies pressure to the heated molten plastic in the feeding cylinder 12. The pressurized molten plastic is injected into the mold through the outlet 28 at the bottom of the injection nozzle 13. After holding the pressure for a preset time, the hydraulic press is operated to make the pressurizing mechanism move upward and drive the copper pressure head 6 out of the feeding cylinder 12.

[0050] The pressurizing mechanism adopts the above-mentioned technical solution, making full use of the hydraulic press on site to drive the pressurizing mechanism to move up and down, applying pressure to the heated and molten plastic, so as to realize the production of small multi-instrument injection molded products.

[0051] In this embodiment, the upper fixing plate 1 and the upper pad 2 are connected by screws 3, which is a simple and convenient connection method.

[0052] Example 3:

[0053] according to Figure 1 and Figure 6 The vertical injection molding machine for plastic products shown in the hydraulic press differs from Embodiment 2 in that: the long pressure rod 4 is an integral structure composed of three cylinders with successively decreasing outer diameters (upper, middle, and lower); the upper cylinder overlaps the upper surface of the upper pad 2, and the outer side wall of the lower cylinder is provided with threads for connection to the copper pressure head 6; the outer diameter of the middle cylinder is smaller than the outer diameter of the copper pressure head 6; the upper support rod 5 is cylindrical, with a boss at its top and threads for connecting nuts on its bottom side wall.

[0054] In practical use, the outer diameter of the upper cylinder of the long pressure rod 4 is larger than that of the middle cylinder, allowing the upper cylinder to be easily and conveniently connected to the upper pad 2 by fitting into the first shoulder hole 18 at the center of the upper pad 2. The outer diameter of the middle cylinder is slightly smaller than that of the copper pressure head 6, which allows the long pressure rod 4 to generate less friction with the feeding cylinder 12 during downward pressurization and upward extraction, ensuring the effectiveness of use. This is also the purpose of setting the copper pressure head.

[0055] In this embodiment, the outer diameter of the long pressure bar is slightly smaller than that of the copper pressure head 6, which has an outer diameter of 0.1 to 0.5 mm.

[0056] The upper support rod 5 adopts the above-mentioned technical solution, which not only facilitates its connection with the upper pad 2 and the material holding mechanism, but also better realizes its guiding function.

[0057] Example 4:

[0058] according to Figures 1-5 The vertical injection molding machine for plastic products shown in the figure differs from Embodiment 2 or Embodiment 3 in that: the upper pad 2 and the upper fixing plate 1 are both rectangular steel plates; the upper pad 2 has a first shoulder hole 18 for connecting the long pressure rod 4 at its center; four first threaded holes 19 for connecting the upper pad 2 and the upper fixing plate 1 are opened around the first shoulder hole 18, and the four first threaded holes 19 are located at the four corners of a square centered on the first shoulder hole 18; second shoulder holes 20 for connecting the upper support rod 5 are symmetrically opened on the left and right sides of the first shoulder hole 18; two first U-shaped grooves 22 are respectively opened on the two opposite sides of the upper pad 2; the upper fixing plate 1 has the same size as the upper pad 2, and second threaded holes 21 are opened on the upper fixing plate 1 at the positions corresponding to the four first threaded holes 19, and second U-shaped grooves 23 are opened at the positions corresponding to the first U-shaped grooves 22, and the first U-shaped grooves 22 and the second U-shaped grooves 23 are used for bolts to pass through when connected to the hydraulic press.

[0059] In practical use, the upper pad 2 and the upper fixed plate 1 adopt the above technical solution, which not only facilitates their connection with related components, but also facilitates the lifting and lowering of the pressurizing mechanism after the upper fixed plate 1 is connected to the hydraulic press, laying the foundation for the successful vertical injection molding of plastic products.

[0060] Example 5:

[0061] according to Figure 1 and Figure 7 The vertical injection frame for plastic products used on a hydraulic press shown differs from Embodiment 2 in that the copper pressure head 6 is a copper cylinder with a circular groove with an opening at the top center. The inner wall of the groove is provided with threads for connecting to the bottom end of the long pressure rod 4.

[0062] In practical use, the copper pressure head 6 adopts the structural design described above, facilitating its connection with the long pressure rod 4. The copper pressure head 6 is made of copper, which effectively extends the service life of the injection holder.

[0063] Example 6:

[0064] according to Figure 1 , Figure 8 and Figure 9 The vertical injection molding machine for plastic products shown in the hydraulic press differs from Embodiment 2 in that: the material holding mechanism includes a support plate 8, a feeding cylinder 12, and an injection nozzle 13; the upper part of the feeding cylinder 12 is detachably connected to the support plate 8, and the bottom end of the feeding cylinder 12 is detachably connected to the injection nozzle 13; a heating mechanism is connected to the outer wall of the feeding cylinder 12; and the support plate 8 is connected to a pressurizing mechanism.

[0065] Furthermore, the feeding cylinder 12 is a hollow cylinder with open top and bottom; the upper outer wall of the feeding cylinder 12 is provided with a protruding ring 25 for connecting with the support plate 8, and the protruding ring 25 has a first connecting hole 26; the lower inner wall of the feeding cylinder 12 is provided with a shoulder 27, and the side wall of the shoulder 27 is provided with a thread for connecting with the injection nozzle 13; the heating mechanism is an electric heating coil 11, which is circumferentially connected to the feeding cylinder 12; the support plate 8 has a feeding cylinder connecting hole 29 at its center, and six centrally symmetrical second connecting holes 30, two left-right symmetrical upper support rod holes 17, and four centrally symmetrical lower support rod holes 16 are opened from the inside to the outside around the feeding cylinder connecting hole 29.

[0066] In practical use, the protruding ring 25 on the feeding cylinder 12 rests on the upper surface of the support plate 8, and the feeding cylinder 12 is fixedly connected to the support plate 8 by screws through the second connecting hole 30. In specific applications, a temperature measuring port 24 can also be opened on the outer wall of the feeding cylinder 12, and a thermocouple 10 is connected to the temperature measuring port 24 to facilitate temperature monitoring of the plastic being injected into the feeding cylinder 12.

[0067] The feeding cylinder 12 adopts the above-mentioned technical solution, which not only facilitates its function of holding and feeding materials, but also allows it to be easily connected with the pressurizing mechanism and the support mechanism, so as to move up and down in cooperation with each other and thus smoothly realize the injection molding function.

[0068] The two upper support rod holes 17 on the pallet 8 are transitionally fitted with the two upper support rods 5 in the pressurizing mechanism. They serve as guides during downward movement and, during upward movement, the pallet 8 is pulled by the end nut, which drives the entire material holding mechanism to rise.

[0069] Example 7:

[0070] according to Figure 1 and Figure 9The vertical injection molding machine for plastic products shown differs from Embodiments 6 and 7 in that: the injection nozzle 13 is an integral structure composed of three cylindrical sections with different outer diameters (upper, middle, and lower) and a hemisphere at the lower end; the outer diameter of the middle cylindrical section is larger than that of the lower cylindrical section, the outer diameter of the lower cylindrical section is larger than that of the upper cylindrical section, and the diameter of the hemisphere is smaller than that of the upper cylindrical section; the outer wall of the upper cylindrical section is provided with threads for connection to the feeding cylinder 12; the upper part of the inner cavity of the injection nozzle 13 is a circular cavity, and the lower part is a frustum-shaped cavity with a larger upper part and a smaller lower part, with the bottom end of the frustum-shaped cavity being the discharge port 28.

[0071] In practical use, the design of the injection nozzle 13 facilitates its connection with the feeding cylinder 12 and the injection of plastic into the injection mold.

[0072] The upper part of the inner cavity of the injection nozzle 13 is a circular cavity, and the lower part is a frustum-shaped cavity that is larger at the top and smaller at the bottom. This design not only facilitates the smooth flow of the injection plastic material inside, but also increases the speed and pressure of the injection plastic descent, resulting in better injection molding effect.

[0073] Example 8:

[0074] according to Figure 1 , Figure 10 and Figure 11 The vertical injection molding machine for plastic products shown in the hydraulic press differs from Embodiment 1 in that: the support mechanism includes lower support rods 9, lower pads 14, and lower fixing plates 15; four lower support rods 9 are provided, and the four lower support rods 9 are vertically connected to the lower pads 14; the lower fixing plates 15 are detachably connected to the lower surface of the lower pads 14; the material holding mechanism is vertically movable and connected to the four lower support rods 9, and the top ends of the four lower support rods 9 pass through the material holding mechanism and are connected to nuts 7.

[0075] In actual use, when the hydraulic press starts to descend, the pressure mechanism connected to it descends. Driven by the pressure mechanism, the material holding mechanism descends along the lower support rod 9 until the material outlet 28 at the lower end of the material holding mechanism connects with the inlet of the injection mold to be injected with plastic.

[0076] The lower support rod 9 serves to fix and guide the structure.

[0077] In practical applications, the four lower support rods 9 are fitted with the lower support rod holes 16 on the pallet 8 to guide the pallet 8 to descend smoothly. Nuts 7 are installed on the top of each of the four lower support rods 9 to limit the movement and ensure that the pallet 8 stops moving when it reaches the top.

[0078] Example 9:

[0079] An injection molding method for a vertical injection frame for plastic products on a hydraulic press, comprising the following steps:

[0080] Step 1: Place the vertical injection frame for plastic products used on the hydraulic press onto the hydraulic press table. After adjusting the position, fix the upper fixed plate 1 on the pressurizing mechanism to the movable crossbeam table of the hydraulic press.

[0081] Step 2: Start the hydraulic press so that the long pressure rod 4 on the pressurizing mechanism, together with the copper pressure head 6, can move freely up and down within the feeding cylinder 12 of the material holding mechanism;

[0082] Step 3: When the copper pressure head 6 is in the feeding cylinder 12 at 1 / 2 height, fix the lower fixed plate 15 in the support mechanism to the hydraulic press table.

[0083] Step 4: Start the hydraulic press, raise the pressurizing mechanism, add the plastic raw material into the feeding cylinder 12 in the support mechanism, and turn on the power of the heating coil 11 to start heating;

[0084] Step 5: Place the mold to be injected directly below the injection nozzle 13 in the material feeding mechanism, aligning it with the sprue;

[0085] Step 6: Operate the hydraulic press to make the pressure mechanism move downward. The copper pressure head 6 on the pressure mechanism enters the feeding cylinder 12 and applies pressure to the heated molten plastic in the feeding cylinder 12. The pressurized molten plastic is injected into the mold through the discharge port 28 at the bottom of the injection nozzle 13.

[0086] Step 7: After the pressure holding time is preset, operate the hydraulic press to make the pressure mechanism move upward, driving the copper pressure head 6 to be pulled out from the feeding cylinder 12; then, the upper support rod 5 in the pressure mechanism pulls the material holding mechanism upward, thereby driving the tray 8 and the feeding cylinder 12 in the material holding mechanism to move upward, and take out the mold, thus completing the injection molding.

[0087] In actual use, adjusting the position in step one means placing the injection rack as close to the center of the hydraulic press table as possible, while also making it easy to use bolts to fix the pressurizing mechanism to the movable crossbeam table of the hydraulic press, and the support mechanism to the hydraulic press table. Since the position of the long slot for the bolts in the hydraulic press table is fixed, the bolt position also needs to be adjusted to facilitate the placement of the vertical injection rack for plastic products.

[0088] This invention connects and fixes a vertical injection frame for plastic products to a hydraulic press, thereby transforming an ordinary hydraulic press into a vertical injection molding machine to achieve vertical injection molding. Removing the vertical injection frame for plastic products will not affect the normal use of the hydraulic press, thus realizing the multi-purpose use of an ordinary hydraulic press.

[0089] This invention has a simple structure, is easy to assemble and disassemble and operate, occupies a small area, and is easy to transport. It is especially suitable for producing small multi-insert injection molded products.

[0090] Where there is no conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. Specific details of the various combinations will not be elaborated here.

[0091] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0092] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0093] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent variations, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A vertical injection molding machine for plastic products used on a hydraulic press, comprising at least a hydraulic press, characterized in that: It also includes a pressurizing mechanism, a material holding mechanism, and a supporting mechanism; the bottom of the pressurizing mechanism is movably connected to the material holding mechanism, and the material holding mechanism is movably connected to the supporting mechanism; the top of the pressurizing mechanism is detachably connected to the movable crossbeam platform on the hydraulic press, and the supporting mechanism is detachably connected to the platform of the hydraulic press; a heating mechanism is provided on the material holding mechanism. The pressurizing mechanism includes an upper fixed plate (1), an upper pad plate (2), a long pressure rod (4), an upper support rod (5), and a copper pressure head (6); the length of the long pressure rod (4) is less than the length of the upper support rod (5); the top of the long pressure rod (4) is connected to the center of the upper surface of the upper pad plate (2), the bottom of the long pressure rod (4) passes vertically through the upper pad plate (2) and is positioned below the upper pad plate (2), and the bottom of the long pressure rod (4) is detachably connected to the copper pressure head (6); the upper... There are two support rods (5). The two upper support rods (5) are symmetrically arranged on both sides of the long pressure rod (4). The top of each upper support rod (5) is connected to the upper surface of the upper pad (2). The bottom of each upper support rod (5) passes vertically through the upper pad (2) and is connected to the material holding mechanism. The bottom of each upper support rod (5) is connected to a nut for fixing to the material holding mechanism. The upper fixing plate (1) is detachably connected to the upper surface of the upper pad (2). The material holding mechanism includes a tray (8), a feeding cylinder (12), and an injection nozzle (13); the upper part of the feeding cylinder (12) is detachably connected to the tray (8), and the bottom end of the feeding cylinder (12) is detachably connected to the injection nozzle (13); a heating mechanism is connected to the outer wall of the feeding cylinder (12); the tray (8) is connected to a pressurizing mechanism. The support mechanism includes a lower support rod (9), a lower pad (14), and a lower fixing plate (15); four lower support rods (9) are provided, and the four lower support rods (9) are vertically connected to the lower pad (14); the lower fixing plate (15) is detachably connected to the lower surface of the lower pad (14); the material holding mechanism is movably connected to the four lower support rods (9), and the top of the four lower support rods (9) passes through the material holding mechanism and is connected to a nut (7).

2. The vertical injection molding machine for plastic products used on a hydraulic press as described in claim 1, characterized in that: The long pressure rod (4) is an integral structure composed of three cylinders with successively decreasing outer diameters: upper, middle and lower. The upper cylinder overlaps the upper surface of the upper pad (2), and the outer side wall of the lower cylinder is provided with threads for connecting to the copper pressure head (6). The outer diameter of the middle cylinder is smaller than the outer diameter of the copper pressure head (6). The upper support rod (5) is cylindrical, with a boss at its top and threads for connecting nuts on its bottom side wall.

3. The vertical injection molding machine for plastic products used on a hydraulic press as described in claim 2, characterized in that: The upper pad (2) and the upper fixing plate (1) are both rectangular steel plates; the upper pad (2) has a first shoulder hole (18) for connecting the long pressure rod (4) at its center; four first threaded holes (19) for connecting the upper pad (2) and the upper fixing plate (1) are opened around the first shoulder hole (18), and the four first threaded holes (19) are located at the four corners of a square centered on the first shoulder hole (18); the upper support rod (4) is symmetrically opened on the left and right sides of the first shoulder hole (18). 5) The second shoulder hole (20); On the two opposite sides of the upper pad (2), there are two first U-shaped grooves (22); The upper fixing plate (1) and the upper pad (2) are the same size. The upper fixing plate (1) has a second threaded hole (21) at the position corresponding to the four first threaded holes (19) and a second U-shaped groove (23) at the position corresponding to the first U-shaped groove (22). The first U-shaped groove (22) and the second U-shaped groove (23) are used for the bolts to pass through when connected to the hydraulic press.

4. A vertical injection molding machine for plastic products used on a hydraulic press as described in claim 1, characterized in that: The copper pressure head (6) is a copper cylinder with a circular groove at the center of its upper part. The inner wall of the groove is provided with threads for connecting to the bottom end of the long pressure rod (4).

5. A vertical injection molding machine for plastic products used on a hydraulic press as described in claim 1, characterized in that: The feeding cylinder (12) is a hollow cylinder with open top and bottom. The upper outer wall of the feeding cylinder (12) is provided with a convex ring (25) for connecting with the support plate (8), and the convex ring (25) has a first connecting hole (26). The lower inner wall of the feeding cylinder (12) is provided with a shoulder (27), and the side wall of the shoulder (27) is provided with a thread for connecting with the injection nozzle (13). The heating mechanism is an electric heating coil (11), which is circumferentially connected to the feeding cylinder (12). The support plate (8) has a feeding cylinder connecting hole (29) at its center. Six centrally symmetrical second connecting holes (30), two left-right symmetrical upper support rod holes (17), and four centrally symmetrical lower support rod holes (16) are opened from the inside to the outside with the feeding cylinder connecting hole (29) as the center.

6. A vertical injection molding machine for plastic products used on a hydraulic press as described in claim 5, characterized in that: The injection nozzle (13) is an integral structure consisting of three cylindrical sections with different outer diameters (upper, middle, and lower) and a hemisphere at the lower end. The outer diameter of the middle cylindrical section is larger than that of the lower cylindrical section, the outer diameter of the lower cylindrical section is larger than that of the upper cylindrical section, and the diameter of the hemisphere is smaller than that of the upper cylindrical section. The outer wall of the upper cylindrical section is provided with a thread for connection with the feeding cylinder (12). The upper part of the inner cavity of the injection nozzle (13) is a circular cavity, and the lower part is a frustum-shaped cavity with a larger upper part and a smaller lower part. The bottom end of the frustum-shaped cavity is the discharge port (28).

7. An injection molding method for a vertical injection frame for plastic products used on a hydraulic press, characterized in that: The vertical injection molding machine for plastic products used on a hydraulic press as described in any one of claims 1-6 includes the following steps: Step 1: Place the vertical injection frame for plastic products used on the hydraulic press onto the hydraulic press table. After adjusting the position, fix the upper fixed plate (1) on the pressurizing mechanism to the moving crossbeam table of the hydraulic press. Step 2: Start the hydraulic press so that the long pressure rod (4) on the pressurizing mechanism, together with the copper pressure head (6), can move freely up and down in the feeding cylinder (12) of the material holding mechanism; Step 3: When the copper pressure head (6) is in the feeding cylinder (12) at 1 / 2 height, fix the lower fixed plate (15) in the support mechanism to the hydraulic press table; Step 4: Start the hydraulic press, raise the pressurizing mechanism, add the plastic raw material into the feeding cylinder (12) in the support mechanism, and turn on the power of the electric heating coil (11) to start heating; Step 5: Place the mold to be injected directly below the injection nozzle (13) in the material holding mechanism, aligning it with the injection mold gate; Step 6: Operate the hydraulic press to make the pressure mechanism move downward. The copper pressure head (6) on the pressure mechanism enters the feeding cylinder (12) and applies pressure to the heated molten plastic in the feeding cylinder (12). The molten plastic under pressure is injected into the mold through the discharge port (28) at the bottom of the injection nozzle (13). Step 7: After the pressure holding time is preset, operate the hydraulic press to make the pressure mechanism move upward, driving the copper pressure head (6) to be pulled out from the feeding cylinder (12); then, the upper support rod (5) in the pressure mechanism pulls the material holding mechanism upward, thereby driving the tray (8) and the feeding cylinder (12) in the material holding mechanism to move upward, take out the mold, and the injection molding is completed.

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