Single-point needle valve hot runner

Abstract

The utility model discloses a single-point needle valve hot runner which comprises a supporting device, an alignment device is fixedly installed at the front end in the supporting device, a guiding device is fixedly installed in the supporting device, and the guiding device comprises a valve needle, a runner, a communicating pipe, a first air cylinder and a second air cylinder. The first air cylinder is fixedly installed at the rear end of the flow channel, the valve needle is fixedly installed in the center of the front end of the first air cylinder, the communicating pipe is fixedly installed behind the right side of the flow channel, and the left side of the flow channel is fixedly installed at the front end of the second air cylinder. The alignment device comprises a cam, a driving motor, a displacement clamping key, a blade, a reset spring, a supporting cavity and a connecting rod, the driving motor is fixedly installed at the rear end of the supporting cavity, and the cam is fixedly installed in the center of the front end of the driving motor. Through the arrangement of the guide device, the alignment device and the supporting device, the aim of removing solidified plastic at the front end of the hot runner is fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding equipment, in particular to a single-point needle valve hot runner. Background Art

[0002] A single-point needle valve hot runner is a hot runner system widely used in injection molds. Its characteristic is that a single-point needle valve controls the flow of molten plastic. During the injection process, molten plastic is injected into the hot runner system and distributed to the various mold cavities as needed through the precise control of the single-point needle valve. When the mold cavity is full, the needle valve quickly closes to prevent further inflow of molten plastic, thus ensuring the consistent and stable quality of each molded part.

[0003] When the existing single-point needle valve hot runner is in use, a small amount of fluid will solidify at the hot runner port when the fluid is sealed inside the hot runner. When the injection molding work is performed again, the solidified plastic object will enter the mold and affect the product. Therefore, a device is needed to improve the above problem. Utility Model Content

[0004] The purpose of the present utility model is to provide a single-point needle valve hot runner to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a single-point needle valve hot runner, comprising a supporting device, a positioning device is fixedly installed on the internal front end of the supporting device, a guide device is fixedly installed on the inside of the supporting device, the guide device comprises a valve needle, a flow channel, a connecting pipe, a first cylinder and a second cylinder, the first cylinder is fixedly installed at the rear end of the flow channel, the valve needle is fixedly installed at the front end center of the first cylinder, the connecting pipe is fixedly installed at the rear right side of the flow channel, and the left side of the flow channel is fixedly installed at the front end of the second cylinder.

[0006] Preferably, the alignment device includes a cam, a drive motor, a displacement key, a blade, a return spring, a support cavity and a connecting rod, the drive motor is fixedly mounted at the rear end of the support cavity, the cam is fixedly mounted at the front end center of the drive motor, the displacement key is slidably inserted into the rear end of the support cavity, the connecting rod is fixedly mounted at the front end of the displacement key, the return spring is symmetrically fixedly mounted on the connecting rod and the inner end of the support cavity away from the cam, and the blade is fixedly mounted on the end of the connecting rod away from the cam.

[0007] Preferably, the supporting device includes a photoelectric sensor, a supporting substrate and a mold cavity, the photoelectric sensor is fixedly mounted on the inner bottom end of the supporting substrate, and the mold cavity is fixedly mounted on the front center of the supporting substrate.

[0008] Preferably, the supporting cavity is fixedly mounted on the inner front end of the supporting base plate, and the second cylinder is fixedly mounted on the inner rear end of the supporting base plate.

[0009] Preferably, the cam is vertically aligned with the displacement key.

[0010] Preferably, the front end center of the flow channel is flush with the inner rear end of the mold cavity.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] When the device is in use, when the second cylinder is turned on, the flow channel as a whole can be driven to move horizontally toward the rear end, so that the front end head of the flow channel can be flush with the rear end surface of the blade. At the same time, when the flow channel moves horizontally toward the rear end, the drive motor can be started, so that the cam can be rotated to contact the displacement card key, so that the blade can pass through the front end surface of the flow channel, so that the solidified plastic can be cut off. Moreover, through the setting of the reset spring, the blade can be driven to reset quickly to complete the work of cutting off the plastic at the front end of the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0014] Figure 2 This is a schematic structural diagram of the guide device of the present utility model;

[0015] Figure 3 It is a partial cutaway schematic diagram of the alignment device of the present utility model;

[0016] Figure 4 It is a partial cutaway schematic diagram of the support device of the present invention.

[0017] In the figure: 1-guide device, 2-alignment device, 3-support device, 4-valve needle, 5-flow channel, 6-connecting pipe, 7-first cylinder, 8-second cylinder, 9-cam, 10-drive motor, 11-displacement key, 12-blade, 13-reset spring, 14-support cavity, 15-connecting rod, 16-photoelectric sensor, 17-support substrate, 18-mold cavity. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-4The utility model provides an embodiment: a single-point needle valve hot runner, including a supporting device 3, a positioning device 2 is fixedly installed on the internal front end of the supporting device 3, a guide device 1 is fixedly installed on the inside of the supporting device 3, and the guide device 1 includes a valve needle 4, a flow channel 5, a connecting pipe 6, a first cylinder 7 and a second cylinder 8. The first cylinder 7 is fixedly installed at the rear end of the flow channel 5, the valve needle 4 is fixedly installed at the front end center of the first cylinder 7, the connecting pipe 6 is fixedly installed at the rear right side of the flow channel 5, and the left side of the flow channel 5 is fixedly installed at the front end of the second cylinder 8.

[0020] The positioning device 2 includes a cam 9, a drive motor 10, a displacement key 11, a blade 12, a return spring 13, a support cavity 14 and a connecting rod 15. The drive motor 10 is fixedly installed at the rear end of the support cavity 14, the cam 9 is fixedly installed at the front end center of the drive motor 10, the displacement key 11 is slidably inserted into the rear end of the support cavity 14, the connecting rod 15 is fixedly installed at the front end of the displacement key 11, the return spring 13 is symmetrically fixed at the connecting rod 15 and the inner end of the support cavity 14 away from the cam 9, the blade 12 is fixedly installed at the end of the connecting rod 15 away from the cam 9. When the raised part of the cam 9 rotates past the displacement key 11, the elasticity of the return spring 13 will drive the blade 12 to reset.

[0021] The supporting device 3 includes a photoelectric sensor 16, a supporting substrate 17 and a mold cavity 18. The photoelectric sensor 16 is fixedly mounted on the inner bottom end of the supporting substrate 17, and the mold cavity 18 is fixedly mounted on the front end center of the supporting substrate 17. Through holes are opened through the rear end center of the mold cavity 18 and the front end center of the supporting substrate 17, so that the runner 5 can be easily connected to the mold cavity 18.

[0022] The supporting cavity 14 is fixedly mounted on the inner front end of the supporting base plate 17 , and the second cylinder 8 is fixedly mounted on the inner rear end of the supporting base plate 17 , and can support the flow channel 5 to work.

[0023] The cam 9 is vertically aligned with the displacement key 11 , thereby improving the contact accuracy between the cam 9 and the displacement key 11 .

[0024] The front end center of the runner 5 is flush with the inner rear end of the mold cavity 18 , thereby improving the docking accuracy between the runner 5 and the mold cavity 18 .

[0025] Working principle: When in use, the connecting pipe 6 is connected to the liquid inlet of the raw material, so that the plastic liquid can be transported to the inside of the flow channel 5 by the connecting pipe 6, and connected to the inside of the mold cavity 18 through the flow channel 5. When the first cylinder 7 is started, the valve needle 4 can be driven to move to the rear end inside the flow channel 5, so that the plastic liquid inside the flow channel 5 can flow into the interior of the mold cavity 18 and cooperate with the external mold to form. Then, when the mold cavity 18 is injected with a specified amount of plastic liquid, the first cylinder 7 can be started again to drive the valve needle 4 to move to the front end. Until the valve needle 4 is reset, the front end of the inner part of the flow channel 5 can be blocked to prevent the plastic liquid from flowing into the interior of the mold cavity 18 again. Then, when the product is formed, The product can be taken out from the inside of the mold cavity 18 to complete the product production work. Subsequently, when the product is removed from the inside of the mold cavity 18, the second cylinder 8 can be started to drive the flow channel 5 to move to the rear end as a whole. When the flow channel 5 moves to the rear end to the extreme position, the front end surface of the flow channel 5 can be driven to be flush with the rear end surface of the blade 12. In addition, an extension plate is installed between the piston rod inside the second cylinder 8 and the flow channel 5. When the flow channel 5 moves to the rear end to the extreme position, the extension plate can be driven to contact the photoelectric sensor 16. There is an electrical connection between the photoelectric sensor 16 and the drive motor 10, so that the drive motor 10 can be started to drive the cam 9 to rotate. When the raised part of the cam 9 rotates to the position aligned with the displacement When the card key 11 contacts, the displacement card key 11 and the connecting rod 15 can be squeezed and displaced toward the end away from the driving motor 10, thereby driving the blade 12 to move, and the rear end of the blade 12 is flush with the front end surface of the runner 5, so that when the blade 12 passes the front end of the runner 5, the solidified plastic at the front end of the runner 5 can be scraped off to prevent the solidified plastic from entering the mold cavity 18 again. Each time the driving motor 10 is started, the cam 9 can be driven to rotate one circle, so that the displacement card key 11 can be driven to move twice, so that the blade 12 can pass through the front end of the runner 5 twice, thereby improving the cleanliness of the front end of the runner 5. Subsequently, the second cylinder 8 can be started to drive the runner 5 to move to the front end, so that the runner 5 and the first cylinder 8 are aligned. The extension plate between the two cylinders 8 is disengaged from the photoelectric sensor 16, and the drive motor 10 is powered off. At this time, the elasticity of the reset spring 13 will drive the blade 12 and the connecting rod 15 to reset quickly, so that the runner 5 can avoid interference with the blade 12 when it resets to the front end. In addition, a displacement groove adapted to the displacement key 11 is opened inside the rear end of the support cavity 14, and the displacement key 11 slides inside the displacement groove, so that the blade 12 can be ensured to move in a straight line. Subsequently, when the runner 5 moves to the front end to the extreme position, the front end of the runner 5 can be driven to fit with the internal rear end of the mold cavity 18 again, so that the runner 5 can transfer the plastic liquid to the interior of the mold cavity 18 for injection molding.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single-point needle valve hot runner, comprising a support device (3), a positioning device (2) fixedly mounted on the front end of the interior of the support device (3), and a guide device (1) fixedly mounted on the interior of the support device (3), characterized in that: The guide device (1) comprises a valve needle (4), a flow channel (5), a connecting pipe (6), a first cylinder (7) and a second cylinder (8), wherein the first cylinder (7) is fixedly mounted at the rear end of the flow channel (5), the valve needle (4) is fixedly mounted at the front center of the first cylinder (7), the connecting pipe (6) is fixedly mounted at the rear right side of the flow channel (5), and the left side of the flow channel (5) is fixedly mounted at the front end of the second cylinder (8).

2. The single-point needle valve hot runner according to claim 1, characterized in that: The alignment device (2) comprises a cam (9), a driving motor (10), a displacement key (11), a blade (12), a return spring (13), a support cavity (14) and a connecting rod (15), wherein the driving motor (10) is fixedly mounted at the rear end of the support cavity (14), the cam (9) is fixedly mounted at the front end center of the driving motor (10), the displacement key (11) is slidably inserted into the rear end of the support cavity (14), the connecting rod (15) is fixedly mounted at the front end of the displacement key (11), the return spring (13) is symmetrically fixedly mounted at one end of the connecting rod (15) and the support cavity (14) away from the cam (9), and the blade (12) is fixedly mounted at one end of the connecting rod (15) away from the cam (9).

3. The single-point needle valve hot runner according to claim 2, characterized in that: The supporting device (3) comprises a photoelectric sensor (16), a supporting substrate (17) and a mold cavity (18), wherein the photoelectric sensor (16) is fixedly mounted on the inner bottom end of the supporting substrate (17), and the mold cavity (18) is fixedly mounted on the front center of the supporting substrate (17).

4. The single-point needle valve hot runner according to claim 3, characterized in that: The supporting cavity (14) is fixedly mounted on the inner front end of the supporting base plate (17), and the second cylinder (8) is fixedly mounted on the inner rear end of the supporting base plate (17).

5. The single-point needle valve hot runner according to claim 4, characterized in that: The cam (9) is vertically aligned with the displacement key (11).

6. The single-point needle valve hot runner according to claim 5, characterized in that: The front end center of the flow channel (5) is flush with the inner rear end of the mold cavity (18).

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