Anti-clogging valve needle hot runner mold

Abstract

This utility model discloses an anti-clogging valve needle hot runner mold, relating to the technical field of valve needle hot runner molds. The anti-clogging valve needle hot runner mold includes a base plate, with a lower mold fixedly connected to the upper end of the base plate and a guide post fixedly connected to the upper end of the base plate. A top plate is slidably connected to the guide post, and a hot runner plate is fixedly connected to the lower end of the top plate. An upper mold is fixedly connected to the lower end of the hot runner plate. A positioning block is installed in the hot runner plate, and a hot runner body is formed inside the positioning block. A valve needle is inserted into the hot runner body, with a cylinder fixedly connected to the upper end of the valve needle. The lower end of the positioning block is connected to a discharge nozzle via an easily detachable mechanism, and a heating element is provided at the outer end of the positioning block. The heating element at the outer end of the positioning block heats the positioning block and the hot runner body, keeping the injection plastic inside the hot runner body in a molten state and preventing residual material from cooling and solidifying, thus avoiding blockage. The discharge nozzle is connected to the positioning block via an easily detachable mechanism, facilitating easy and quick cleaning of the inside of the hot runner body and maintenance of the heating element.

Description

Technical Field

[0001] This utility model relates to the field of valve needle hot runner mold technology, specifically to an anti-clogging valve needle hot runner mold. Background Technology

[0002] Hot runner injection molding uses valve needles controlled by a valve needle device to mechanically open or close the gate at predetermined times. This type of hot runner system has many advantages that hot tip and sprue-type runner systems cannot possess. The valve needles in the gate valve needle system have high hardness, high toughness, and surface nitriding treatment; they also have a long service life and good strength.

[0003] Existing technology CN221605044U discloses a mold with an anti-adhesive valve needle and a hot runner, including a molding assembly and a hot runner assembly. The hot runner assembly includes a positioning block, and a hot runner body is formed inside the positioning block. A plug is detachably connected to the lower end of the positioning block, and a discharge nozzle is fixedly connected to the lower end of the plug. A needle tube is installed inside the hot runner body, and a spring is fixedly connected to the lower end of the needle tube. A valve needle is inserted into the needle tube. By repeatedly pressing down the spring, the injection plastic can be guided while preventing adhesive from adhering to the side surface of the valve needle, thereby preventing the hot runner body from clogging and improving injection efficiency. At the same time, by removing the screw ring from the threaded groove, the plug and positioning block can be disassembled, and the valve needle can be disassembled.

[0004] However, the following shortcomings still exist in actual use: relying solely on the needle to scrape off the plastic injection on the surface of the valve needle, the plastic injection residue on the inner wall of the hot runner body cannot be cleaned. After the machine is stopped, the residual material cools and solidifies, causing blockage of the hot runner body. Disassembly and cleaning are required for the next startup, which is quite troublesome. The discharge nozzle and the positioning block are connected by threads, and the screw ring needs to be rotated repeatedly during disassembly and assembly, which reduces the efficiency of the staff in maintaining the nozzle.

[0005] Based on this, we now offer anti-clogging valve needle hot runner molds, which can eliminate the drawbacks of existing devices. Utility Model Content

[0006] The purpose of this invention is to provide a valve needle hot runner mold that prevents clogging, so as to solve the problems in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A hot runner mold for preventing clogging of valve needles includes a base plate, a lower mold fixedly connected to the upper end of the base plate, a guide post fixedly connected to the upper end of the base plate, a top plate slidably connected to the guide post, a hot runner plate fixedly connected to the lower end of the top plate, an upper mold fixedly connected to the lower end of the hot runner plate, a positioning block installed in the hot runner plate, a hot runner body opened inside the positioning block, a valve needle inserted into the hot runner body, a cylinder fixedly connected to the upper end of the valve needle to drive the valve needle to move up and down, a discharge nozzle connected to the lower end of the positioning block through an easily detachable mechanism, and a heating element provided at the outer end of the positioning block.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions: In one alternative embodiment: the easily detachable mechanism includes an insertion block fixedly connected to the discharge nozzle; a positioning block having an insertion groove corresponding to the insertion block; a fixing groove on the positioning block; two fixing blocks slidably connected in the fixing groove; a slot on the insertion block corresponding to the fixing block; one end of a first spring fixedly connected to the fixing block; the other end of the first spring connected to the inner wall of the fixing groove; a trapezoidal slider between the two fixing blocks; an inclined surface on the fixing block corresponding to the trapezoidal slider; one end of a second spring fixedly connected to the trapezoidal slider; the other end of the second spring connected to the inner wall of the fixing groove; and a pressing block fixedly connected to the trapezoidal slider.

[0009] In one alternative embodiment: the heating component includes a heat-conducting cylinder, which is slidably connected to the outer end of the positioning block. The heat-conducting cylinder is provided with a limiting groove, and the outer end of the positioning block is provided with a limiting block corresponding to the limiting groove. The outer end of the heat-conducting cylinder is provided with a spiral heating rod, and the outer end of the discharge nozzle is fixedly connected to a pressing block, which contacts the lower end of the heat-conducting cylinder.

[0010] In one alternative: the top plate is provided with a feeding port, which is connected to the hot runner body via a feeding pipe.

[0011] In one alternative: the two fixing blocks are arranged symmetrically in the fixing groove.

[0012] In one alternative: a sealing ring is fixedly connected to the insertion slot.

[0013] In one alternative, the heat-conducting cylinder is made of copper.

[0014] In one alternative: the heat-conducting cylinder is wrapped with insulating cotton.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention uses a heating element at the outer end of the positioning block to heat the positioning block and the hot runner body, keeping the injection plastic inside the hot runner body in a molten state. This prevents residual material from cooling and solidifying after shutdown, thus avoiding blockages. It also eliminates the need for frequent mold disassembly and cleaning, greatly improving production efficiency. The discharge nozzle is connected to the positioning block via an easy-to-disassemble mechanism, facilitating cleaning the inside of the hot runner body and maintenance of the heating element. The entire disassembly and assembly process does not require repeated rotation of the parts, making operation simple and quick, and significantly improving the maintenance efficiency of the staff. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the present invention.

[0018] Figure 3 This is a structural schematic diagram of the positioning block of this utility model.

[0019] Figure 4 This is a cross-sectional view of the positioning block of this utility model.

[0020] Figure 5 This is a schematic diagram of the structure at point A of this utility model.

[0021] Figure 6 This is a schematic diagram of the easily disassembled mechanism of this utility model.

[0022] Figure 7 This is a schematic diagram of the structure of the discharge nozzle of this utility model.

[0023] Figure reference numerals: 100, base plate; 101, lower mold; 102, guide post; 200, top plate; 201, hot runner plate; 202, upper mold; 203, positioning block; 204, hot runner body; 205, valve needle; 206, cylinder; 207, discharge nozzle; 301, insertion block; 302, insertion groove; 303, fixing groove; 304, fixing block; 305, slot; 306, spring one; 307, trapezoidal slider; 308, spring two; 309, pressing block; 401, heat-conducting cylinder; 402, limiting groove; 403, limiting block; 404, spiral heating rod; 405, pressing block; 501, feeding port; 502, feeding tube; 600, sealing ring; 700, insulation cotton. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] In one embodiment, such as Figures 1-7As shown, the anti-clogging valve needle hot runner mold includes a base plate 100. A lower mold 101 is fixedly connected to the upper end of the base plate 100. A guide post 102 is fixedly connected to the upper end of the base plate 100. A top plate 200 is slidably connected to the guide post 102. A hot runner plate 201 is fixedly connected to the lower end of the top plate 200. An upper mold 202 is fixedly connected to the lower end of the hot runner plate 201. A positioning block 203 is installed in the hot runner plate 201. A hot runner body 204 is formed inside the positioning block 203. A valve needle 205 is inserted into the hot runner body 204. A cylinder 206, which drives the valve needle 205 to move up and down, is fixedly connected to the upper end of the valve needle 205. The lower end of the positioning block 203 is connected to the outlet nozzle 207 via an easy-to-disassemble mechanism. The outer end of the positioning block 203 is equipped with a heating element. When injection molding material is added into the hot runner body 204, the cylinder 206 drives the valve needle 205 to move downward to block the outlet nozzle 207. When injection molding is required, the cylinder 206 drives the valve needle 205 to move upward to open the outlet nozzle 207. The positioning block 203 is heated by the heating element, thereby increasing the temperature inside the hot runner body 204 and keeping the injection molding material inside the hot runner body 204 in a liquid state to prevent blockage. The outlet nozzle 207 can be disassembled via the easy-to-disassemble mechanism, which facilitates cleaning the inside of the hot runner body 204 and maintenance of the heating element.

[0026] In this embodiment, as Figure 5 , Figure 6 and Figure 7As shown, the easily detachable mechanism includes an insertion block 301, which is fixedly connected to the discharge nozzle 207. The positioning block 203 has an insertion groove 302 corresponding to the insertion block 301 and a fixing groove 303. Two fixing blocks 304 are slidably connected in the fixing groove 303. The insertion block 301 has a corresponding slot 305. One end of a spring 306 is fixedly connected to the fixing block 304, and the other end of the spring 306 is connected to the inner wall of the fixing groove 303. A trapezoidal slider 307 is provided between the two fixing blocks 304. The fixing block 304 has an inclined surface corresponding to the trapezoidal slider 307. The trapezoidal slider 307 is fixedly connected to... One end of the second spring 308 is connected to the second spring 308, and the other end of the second spring 308 is connected to the inner wall of the fixing groove 303. The trapezoidal slider 307 is fixedly connected to the pressing block 309. When the discharge nozzle 207 needs to be disassembled for maintenance, the worker presses the pressing block 309, which drives the trapezoidal slider 307 to move. The second spring 308 is compressed. During the movement, the inclined surface of the trapezoidal slider 307 will exert a squeezing force on the inclined surface of the fixing block 304, pushing the two fixing blocks 304 to move away from the slot 305. The first spring 306 is compressed, and the fixing block 304 is removed from the slot 305. At this time, the worker can pull the discharge nozzle 207 down to remove the insertion block 301 from the insertion groove 302, thus completing the disassembly of the discharge nozzle 207.

[0027] In one embodiment, such as Figure 3 and Figure 4 As shown, the heating component includes a heat-conducting cylinder 401, which is slidably connected to the outer end of the positioning block 203. The heat-conducting cylinder 401 has a limiting groove 402, and the outer end of the positioning block 203 has a limiting block 403 corresponding to the limiting groove 402. A spiral heating rod 404 is provided at the outer end of the heat-conducting cylinder 401. A pressing block 405 is fixedly connected to the outer end of the discharge nozzle 207, and the pressing block 405 contacts the lower end of the heat-conducting cylinder 401. During the mold operation process... In the process, the spiral heating rod 404 generates heat when energized, and the heat is transferred to the heat-conducting cylinder 401. The heat-conducting cylinder 401 further transfers the heat to the positioning block 203, thereby heating the injection plastic in the hot runner body 204, keeping the injection plastic in a molten state, and preventing the injection plastic from cooling and solidifying in the hot runner body 204 and causing blockage. Due to the obstruction of the pressure block 405, the heat-conducting cylinder 401 cannot slide out from the outer end of the positioning block 203. When the discharge nozzle 207 is disassembled, the heat-conducting cylinder 401 can be removed.

[0028] In one embodiment, such as Figure 2 As shown, the top plate 200 is provided with a feeding port 501, which is connected to the hot runner body 204 through a feeding pipe 502. Plastic is added to the hot runner body 204 through the feeding port 501 and the feeding pipe 502.

[0029] In one embodiment, such as Figure 6 As shown, the two fixing blocks 304 are symmetrically arranged in the fixing groove 303. When symmetrically arranged, the two fixing blocks can apply clamping forces of equal magnitude and opposite direction from both sides of the insertion block 301, so that the insertion block 301 is subjected to uniform force as a whole, and there is no situation where the force on one side is too large.

[0030] In one embodiment, such as Figure 5 As shown, a sealing ring 600 is fixedly connected in the insertion groove 302. When the insertion block 301 is inserted into the insertion groove 302, the sealing ring 600 can enhance the sealing between the two. The sealing ring 600 has a certain elasticity. When the insertion block 301 is inserted into the insertion groove 302, it will squeeze the sealing ring 600, making the discharge nozzle 207 more stable.

[0031] In one embodiment, such as Figure 4 As shown, the heat-conducting cylinder 401 is made of copper, which has good thermal conductivity, allowing the injection molding plastic to melt better.

[0032] In one embodiment, such as Figure 4 As shown, the heat-conducting cylinder 401 is wrapped with heat-insulating cotton 700, which can effectively reduce the heat loss of the heat-conducting cylinder 401 and improve energy utilization.

[0033] The above embodiment discloses an anti-clogging valve needle hot runner mold, wherein when the top plate 200 slides downward, it drives the hot runner plate 201 and the upper mold 202 to move downward together, so that the upper mold 202 and the lower mold 101 close to form an injection cavity. Injection plastic is added to the hot runner body 204 through the feeding port 501 and the feeding pipe 502. The cylinder 206 drives the valve needle 205 to move downward to block the discharge nozzle 207. When injection is required, the cylinder 206 drives the valve needle 205 to move upward to open the discharge nozzle 207 and inject injection plastic into the injection cavity for injection molding. The spiral heating rod 404 generates heat when energized, and the heat is transferred to the heat conducting cylinder 401. The heat conducting cylinder 401 further transfers the heat to the positioning block 203, thereby heating it. The injection plastic in the hot runner body 204 is kept in a molten state to prevent it from cooling and solidifying inside the hot runner body 204 and causing blockage. When the outlet nozzle 207 needs to be disassembled for maintenance, the operator presses the pressing block 309, which moves the trapezoidal slider 307. The second spring 308 is compressed. During the movement of the trapezoidal slider 307, its inclined surface will exert a squeezing force on the inclined surface of the fixed block 304, pushing the two fixed blocks 304 to move away from the slot 305. The first spring 306 is compressed, and the fixed block 304 is removed from the slot 305. At this time, the operator can pull the outlet nozzle 207 down to remove the insertion block 301 from the insertion groove 302, thus completing the disassembly of the outlet nozzle 207.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A valve needle hot runner mold for preventing blockage, comprising a base plate (100), characterized in that, The upper end of the base plate (100) is fixedly connected to the lower mold (101), the upper end of the base plate (100) is fixedly connected to the guide post (102), the guide post (102) is slidably connected to the top plate (200), the lower end of the top plate (200) is fixedly connected to the hot runner plate (201), the lower end of the hot runner plate (201) is fixedly connected to the upper mold (202), a positioning block (203) is installed in the hot runner plate (201), a hot runner body (204) is opened inside the positioning block (203), a valve needle (205) is inserted in the hot runner body (204), the upper end of the valve needle (205) is fixedly connected to the cylinder (206) that drives the valve needle (205) to move up and down, the lower end of the positioning block (203) is connected to the discharge nozzle (207) through an easy-to-disassemble mechanism, and a heating component is provided on the outer end of the positioning block (203).

2. The anti-clogging valve needle hot runner mold according to claim 1, characterized in that, The easily detachable mechanism includes an insertion block (301) fixedly connected to the discharge nozzle (207). A positioning block (203) has an insertion groove (302) corresponding to the insertion block (301), and a fixing groove (303) on the positioning block (203). Two fixing blocks (304) are slidably connected in the fixing groove (303). The insertion block (301) has a slot (305) corresponding to the fixing blocks (304). The fixing blocks (304) are fixedly connected to... One end of spring one (306) is connected to the inner wall of the fixing groove (303), and a trapezoidal slider (307) is provided between the two fixing blocks (304). The fixing block (304) is provided with an inclined surface corresponding to the trapezoidal slider (307). The trapezoidal slider (307) is fixedly connected to one end of spring two (308), and the other end of spring two (308) is connected to the inner wall of the fixing groove (303). The trapezoidal slider (307) is fixedly connected to the pressing block (309).

3. The anti-clogging valve needle hot runner mold according to claim 1, characterized in that, The heating component includes a heat-conducting cylinder (401), which is slidably connected to the outer end of the positioning block (203). The heat-conducting cylinder (401) is provided with a limiting groove (402). The outer end of the positioning block (203) is provided with a limiting block (403) corresponding to the limiting groove (402). The outer end of the heat-conducting cylinder (401) is provided with a spiral heating rod (404). The outer end of the discharge nozzle (207) is fixedly connected to a pressing block (405), which is in contact with the lower end of the heat-conducting cylinder (401).

4. The anti-clogging valve needle hot runner mold according to claim 1, characterized in that, The top plate (200) is provided with a feeding port (501), which is connected to the hot runner body (204) through a feeding pipe (502).

5. The anti-clogging valve needle hot runner mold according to claim 2, characterized in that, The two fixing blocks (304) are symmetrically arranged in the fixing groove (303).

6. The anti-clogging valve needle hot runner mold according to claim 2, characterized in that, A sealing ring (600) is fixedly connected in the insertion groove (302).

7. The anti-clogging valve needle hot runner mold according to claim 3, characterized in that, The heat-conducting cylinder (401) is made of copper.

8. The anti-clogging valve needle hot runner mold according to claim 3, characterized in that, The heat-conducting cylinder (401) is wrapped with heat-insulating cotton (700).

Images