Valve needle sleeve for hot runner

Abstract

The utility model discloses a valve needle sleeve for a hot runner, and relates to the technical field of valve needle sleeves. The device comprises a splitter plate, a valve needle sleeve clamped at the upper part of the splitter plate, and a limiting assembly movably connected to the upper side of the splitter plate, wherein the limiting assembly is positioned on the peripheral side of the valve needle sleeve; a trapezoidal groove corresponding to the valve needle sleeve is formed in the splitter plate in the vertical direction, the valve needle sleeve comprises an installation sleeve and a guide sleeve arranged at the lower end of the installation sleeve, a sliding barrel is elastically matched with the peripheral side of the guide sleeve, an outer extrusion ring and a sealing ring are arranged on the peripheral side of the sliding barrel, and two inverted-L-shaped clamping grooves corresponding to the limiting assemblies are formed in the side portion of the installation sleeve. The limiting assembly rotates to be matched with the inverted-L-shaped clamping groove, the limiting assembly can conveniently limit the installation sleeve, the valve needle sleeve can be rapidly installed or disassembled, meanwhile, the sliding barrel is elastically matched with the peripheral side of the sleeve in a matched mode, and the valve needle sleeve is stable in use after being installed and not prone to being disengaged from the splitter plate.

Description

Technical Field

[0001] The utility model belongs to the field of valve needle sleeves, and in particular relates to a valve needle sleeve used on a hot runner. Background Art

[0002] Hot runner mold is a commonly used plastic injection molding mold. Hot runner mold is used in injection molding, especially in some multi-cavity molds for mass production of small plastic parts. A valve needle device is usually set at the discharge nozzle.

[0003] A Chinese patent with publication number CN214982882U discloses a hot runner valve needle device with an improved valve needle sleeve, comprising a diverter plate, a hot nozzle, a valve needle and a valve needle sleeve, wherein a plurality of branch hot runners with 90-degree turns are arranged on the diverter plate, the hot nozzle is fixedly mounted on the diverter plate, a hot nozzle flow channel is arranged in the hot nozzle, and the hot nozzle flow channel is connected with the branch hot runner; a valve needle connecting through hole facing the hot nozzle is arranged at a 90-degree turning position of the branch hot runner on the diverter plate corresponding to the branch hot runner, the valve needle sleeve is mounted at the opening position of the valve needle connecting through hole, the valve needle passes through the valve needle sleeve and the diverter plate, and extends into the hot nozzle flow channel of the hot nozzle.

[0004] During use, the hot runner valve needle device of the improved valve needle sleeve disclosed in the application is sealed by adding sealant to the replenishing groove or installing an O-ring buffer rubber ring. The method of adding sealant is likely to cause difficulty in the subsequent separation of the valve needle sleeve and the diverter plate, while the method of directly installing an O-ring buffer rubber ring is likely to cause the valve needle sleeve to loosen and detach from the diverter plate during use. Summary of the invention

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a valve needle sleeve for a hot runner.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0007] A valve needle sleeve for a hot runner comprises a diverter plate, a valve needle sleeve clamped on the upper part of the diverter plate, and a limit assembly movably connected to the upper side of the diverter plate, wherein the limit assembly is located on the peripheral side of the valve needle sleeve;

[0008] A trapezoidal groove corresponding to the valve needle sleeve is provided in the vertical direction of the diverter plate. The valve needle sleeve includes a mounting sleeve and a guide sleeve installed at the lower end of the mounting sleeve. The lower part of the mounting sleeve and the guide sleeve are movably fitted in the trapezoidal groove group. A sliding cylinder is elastically fitted on the peripheral side of the guide sleeve. An external extrusion ring and a sealing ring are installed on the peripheral side of the sliding cylinder. The sealing ring is installed at the lower end of the external extrusion ring. Two inverted X-shaped grooves corresponding to the limit assembly are opened on the side of the mounting sleeve.

[0009] Optionally, the trapezoidal groove includes a slot opened on the upper side of the diverter plate and corresponding to the mounting sleeve, the lower part of the mounting sleeve is located in the slot, a sealing groove corresponding to the outer extrusion ring is opened at the lower end of the inner wall of the slot, the outer extrusion ring and the sealing ring are both located in the sealing groove, a through groove corresponding to the guide sleeve is opened at the lower end of the inner wall of the sealing groove, the through groove runs through the lower side of the diverter plate, the lower part of the guide sleeve and the lower part of the slide are both located in the through groove, the diameter of the sealing groove is larger than the diameter of the through groove and smaller than the diameter of the slot, and the displacement distance of the extrusion ring is limited by the lower end of the inner wall of the sealing groove, so that the extrusion ring cooperates with the lower end of the inner wall of the sealing groove to clamp the sealing ring.

[0010] Optionally, two guide rods are installed on the side of the inner wall of the slot, the distance between the two guide rods is greater than the diameter of the sealing groove, and a guide groove corresponding to the guide rod is opened on the side of the mounting sleeve. The guide rod is located in the guide groove, and the guide groove runs through the lower end of the mounting sleeve. The guide rod cooperates with the guide groove to facilitate positioning and installation of the mounting sleeve.

[0011] Optionally, the inverted X-shaped slot includes a sliding slot, a side sliding slot, and a limit slot opened on the side of the mounting sleeve. The sliding slot and the limit slot are both located at the lower side of the side sliding slot. The sliding slot and the limit slot are both connected to the side sliding slot. The sliding slot passes through the lower end of the mounting sleeve. The sliding slot passes through the lower end of the mounting sleeve, making it convenient for part of the structure of the limit assembly to slide from the lower part of the sliding slot into the inverted X-shaped slot.

[0012] Optionally, the limiting assembly includes a swivel that is movably fitted on the upper side of the diverter plate, a plurality of friction strips are provided on the side of the swivel, a protrusion corresponding to the inverted X-shaped groove is installed on the side of the inner wall of the swivel, the protrusion is located in the limiting groove, an extension ring is installed on the upper side of the diverter plate, a limiting ring is installed on the upper part of the extension ring, the swivel and the extension ring and the limiting ring are all located on the circumferential side of the mounting sleeve, the extension ring and the limiting ring are both located inside the swivel, the roughness of the surface of the swivel is increased by the friction strips, thereby facilitating the application of force to rotate the swivel.

[0013] Optionally, a ring groove is provided on the circumference of the guide sleeve, an inner extrusion ring slidingly fitted in the ring groove is installed on the circumference of the inner wall of the slide cylinder, a spring is provided between the inner extrusion ring and the upper end of the inner wall of the ring groove, and the spring is sleeved on the circumference of the guide sleeve.

[0014] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art. Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described below at the same time:

[0015] The limiting assembly rotates and cooperates with the inverted X-shaped slot, which makes it easy for the limiting assembly to limit the installation sleeve, thereby quickly installing or removing the valve needle sleeve. At the same time, the sliding cylinder is elastically fitted on the circumference of the sleeve, so that the valve needle sleeve is stable and not easy to separate from the diverter plate after installation, and the outer extrusion ring and the trapezoidal groove squeeze and clamp the sealing ring, thereby improving the sealing effect between the valve needle sleeve and the diverter plate, and the elastic force is used to make the valve needle sleeve pop out of the trapezoidal groove during disassembly.

[0016] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0018] Figure 1 This is a schematic diagram of the valve needle sleeve installation effect structure of an embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of a diverter plate and a valve needle sleeve according to an embodiment of the utility model;

[0020] Figure 3 It is a structural schematic diagram of the valve needle sleeve disassembly effect of one embodiment of the utility model.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] Diverter plate 1, slot 101, sealing groove 102, through groove 103, guide rod 104, extension ring 105, limit ring 106, valve needle sleeve 2, installation sleeve 201, guide sleeve 202, sliding groove 203, side sliding groove 204, limit groove 205, guide groove 206, slide cylinder 207, outer extrusion ring 208, sealing ring 209, inner extrusion ring 210, ring groove 211, spring 212, swivel ring 3, friction strip 301, protrusion 302.

[0023] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] The utility model will now be further described in detail with reference to the accompanying drawings.

[0025] See also Figure 1-3As shown, in this embodiment, a valve needle sleeve for a hot runner is provided, which includes a manifold plate 1, a valve needle sleeve 2 clamped on the upper part of the manifold plate 1, and a limiting component movably connected to the upper side of the manifold plate 1. The limiting component is located on the peripheral side of the valve needle sleeve 2.

[0026] The manifold plate 1 is provided with trapezoidal grooves corresponding to the valve needle sleeve 2 in the vertical direction. The valve needle sleeve 2 includes an installation sleeve 201 and a guiding sleeve 202 installed at the lower end of the installation sleeve 201. The lower part of the installation sleeve 201 and the guiding sleeve 202 are both movably fitted in the trapezoidal groove group. A sliding cylinder 207 is elastically fitted on the peripheral side of the guiding sleeve 202. An outer extrusion ring 208 and a sealing ring 209 are installed on the peripheral side of the sliding cylinder 207. The sealing ring 209 is installed at the lower end of the outer extrusion ring 208. Two inverted L-shaped clamping grooves corresponding to the limiting component are formed on the side part of the installation sleeve 201, and a part of the structure of the limiting component is located in the inverted L-shaped clamping grooves.

[0027] One application aspect of this embodiment is as follows: During disassembly, first press the sleeve 201 towards the manifold plate 1, then rotate the limiting component, and then release the pressing on the sleeve 201. At this time, since the moving direction of the sliding cylinder 207 is restricted by the cooperation between the outer extrusion ring 208 and the inner wall of the trapezoidal groove, the guiding sleeve 202 is pushed by the elastic force to slide the installation sleeve 201 out of the trapezoidal groove, so that the part of the limiting component located in the inverted L-shaped clamping groove is separated from the installation sleeve 201, and then the valve needle sleeve 2 can be directly pulled out of the manifold plate 1 to complete the disassembly. Similarly, referring to the above operations, the valve needle sleeve 2 can be installed. After installation, the sliding cylinder 207 pulls the outer extrusion ring 208 in the direction away from the pressing sleeve 201 under the action of the elastic force, so that the outer extrusion ring 208 and the inner wall of the trapezoidal groove cooperate to squeeze the sealing ring 209 for sealing.

[0028] The trapezoidal groove of this embodiment includes a slot 101 opened on the upper side of the manifold plate 1 corresponding to the installation sleeve 201. The lower part of the installation sleeve 201 is located in the slot 101. A sealing groove 102 corresponding to the outer extrusion ring 208 is opened at the lower end of the inner wall of the slot 101. The outer extrusion ring 208 and the sealing ring 209 are both located in the sealing groove 102. A through groove 103 corresponding to the guiding sleeve 202 is opened at the lower end of the inner wall of the sealing groove 102. The through groove 103 penetrates the lower side of the manifold plate 1. The lower parts of the guiding sleeve 202 and the sliding cylinder 207 are both located in the through groove 103. The diameter of the sealing groove 102 is larger than the diameter of the through groove 103 and smaller than the diameter of the slot 101. The displacement distance of the extrusion ring 208 is limited by the lower end of the inner wall of the sealing groove 102, so that the extrusion ring 208 and the lower end of the inner wall of the sealing groove 102 cooperate to clamp the sealing ring 209, improving the sealing performance between the manifold plate 1 and the valve needle sleeve 2.

[0029] In this embodiment, two guide rods 104 are installed on the side of the inner wall of the slot 101, and the distance between the two guide rods 104 is greater than the diameter of the sealing groove 102. A guide groove 206 corresponding to the guide rod 104 is opened on the side of the mounting sleeve 201. The guide rod 104 is located in the guide groove 206, and the guide groove 206 passes through the lower end of the mounting sleeve 201. The guide rod 104 cooperates with the guide groove 206 to facilitate the positioning and installation of the mounting sleeve 201, thereby reducing the probability of the mounting sleeve 201 rotating due to the rotation of the limit assembly.

[0030] The inverted 24-shaped slot in this embodiment includes a sliding slot 203, a side sliding slot 204, and a limiting slot 205 which are arranged on the side of the mounting sleeve 201. The sliding slot 203 and the limiting slot 205 are both located at the lower side of the side sliding slot 204. The sliding slot 203 and the limiting slot 205 are both connected to the side sliding slot 204. The sliding slot 203 and the limiting slot 205 are not directly connected to each other. The sliding slot 203 passes through the lower end of the mounting sleeve 201. The sliding slot 203 passes through the lower end of the mounting sleeve 201, so that part of the limiting component structure can slide from the lower part of the sliding slot 203 into the inverted 24-shaped slot.

[0031] The limiting assembly of the present embodiment includes a swivel 3 movably fitted on the upper side of the diverter plate 1, a plurality of friction strips 301 are provided on the side of the swivel 3, a convex block 302 corresponding to the inverted groove is installed on the inner wall side of the swivel 3, and the convex block 302 is located in the limiting groove 205, an extension ring 105 is installed on the upper side of the diverter plate 1, and a limiting ring 106 is installed on the upper part of the extension ring 105, the swivel 3 and the extension ring 105 and the limiting ring 106 are all located on the circumference of the installation sleeve 201, and the extension ring 105 and the limiting ring 106 are all located in the swivel 3, and a movable ring groove adapted to the extension ring 105 and the limiting ring 106 is opened on the lower side of the swivel 3, and the extension ring 105 and the limiting ring 106 are arranged on the lower side of the swivel 3. They are all located in the movable ring groove. When disassembling, first press the sleeve 201 in the direction of the diverter plate 1. This process causes the protrusion 302 to move from the limit groove 205 to the side slide groove 204. Then the limit assembly is rotated. This process causes the protrusion 302 to slide in the side slide groove 204 and align with the slide-in groove 203. The installation sleeve 201 slides out of the trapezoidal groove under the action of elastic force. In this process, the protrusion 302 slides out of the inverted groove along the slide-in groove 203. When installing, the installation sleeve 201 rebounds a certain distance to make the protrusion 302 snap into the limit groove 205 for installation. The friction strip 301 is used to increase the roughness of the surface of the swivel 3, thereby facilitating the force application and rotation of the swivel 3.

[0032] An annular groove 211 is provided on the circumference of the guide sleeve 202 of the present embodiment, and an inner extrusion ring 210 which slides in the annular groove 211 is installed on the circumference of the inner wall of the slide cylinder 207. Lubricating oil is applied to the inner wall surface of the annular groove 211 to reduce the friction between the inner extrusion ring 210 and the inner wall of the annular groove 211. At the same time, the lubricating oil can be filled into the gap between the inner extrusion ring 210 and the inner wall of the annular groove 211. A spring 212 is provided between the inner extrusion ring 210 and the upper end of the inner wall of the annular groove 211. The spring 212 is sleeved on the circumference of the guide sleeve 202. After installation, the inner extrusion ring 210 is squeezed by the rebound of the spring 212, so that the outer extrusion ring 208 applies force to squeeze the sealing ring 209 to ensure the sealing effect of the device.

[0033] The present invention is not limited to the above-mentioned implementation modes. Anyone should be aware of the structural changes made under the inspiration of the present invention. Any technical solution that is the same or similar to the present invention falls within the protection scope of the present invention. The technology, shape, and structure that are not described in detail in the present invention are all known technologies.

Claims

1. A valve needle sleeve for a hot runner, characterized in that: include: A flow dividing plate (1), a valve needle sleeve (2) clamped on the upper part of the flow dividing plate (1), and a limit assembly movably connected to the upper side of the flow dividing plate (1), the limit assembly being located on the peripheral side of the valve needle sleeve (2); The flow divider (1) is provided with a trapezoidal groove corresponding to the valve needle sleeve (2) in the vertical direction. The valve needle sleeve (2) comprises a mounting sleeve (201) and a guide sleeve (202) mounted at the lower end of the mounting sleeve (201). A slide sleeve (207) is elastically fitted on the circumference of the guide sleeve (202). An outer extrusion ring (208) and a sealing ring (209) are mounted on the circumference of the slide sleeve (207). Two inverted grooves corresponding to the limit assembly are provided on the side of the mounting sleeve (201).

2. The valve needle sleeve for a hot runner according to claim 1, characterized in that: The trapezoidal groove comprises a slot (101) formed on the upper side of the splitter plate (1) and corresponding to the mounting sleeve (201); a sealing groove (102) corresponding to the outer extrusion ring (208) is formed at the lower end of the inner wall of the slot (101); and a through groove (103) corresponding to the guide sleeve (202) is formed at the lower end of the inner wall of the sealing groove (102).

3. The valve needle sleeve for a hot runner according to claim 2, characterized in that: Two guide rods (104) are installed on the inner wall side of the slot (101), and a guide groove (206) corresponding to the guide rods (104) is opened on the side of the installation sleeve (201).

4. The valve needle sleeve for a hot runner according to claim 1, characterized in that: The inverted slot comprises a slide-in slot (203), a side slide slot (204), and a limit slot (205) which are arranged on the side of the installation sleeve (201); the slide-in slot (203) and the limit slot (205) are both located on the lower side of the side slide slot (204); and the slide-in slot (203) passes through the lower end of the installation sleeve (201).

5. The valve needle sleeve for a hot runner according to claim 4, characterized in that: The limiting assembly comprises a rotating ring (3) movably fitted on the upper side of the diverter plate (1), and a protrusion (302) corresponding to the inverted groove is installed on the side of the inner wall of the rotating ring (3).

6. The valve needle sleeve for a hot runner according to claim 1, characterized in that: An annular groove (211) is provided on the circumference of the guide sleeve (202), an inner extrusion ring (210) slidably fitted in the annular groove (211) is installed on the circumference of the inner wall of the slide cylinder (207), and a spring (212) is provided between the inner extrusion ring (210) and the upper end of the inner wall of the annular groove (211).

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