Mold structure of integrated valve body structure

Abstract

The utility model discloses a mould structure of integrated valve body structure can be wrapped completely when twice injection molding valve body, improve product quality. Mould structure includes openable and closeable front mould and back mould, and pre -stopper, first mould core, second mould core and drive arrangement, and front mould is provided with front material groove, and back mould is provided with rear material groove, and the material groove of front material groove and rear material groove is enclosed and forms the material cavity that matches with the outer contour of valve body after moulding, and pre -stopper is elastically fitted in rear material groove, and it includes the convex part that is fitted in the surface of back mould in telescopic cooperation, and the limit part that is integrally formed with convex part, and limit part is used for fixing the position of water pipe in rear material groove, and the front mould of moulding abuts convex part to make limit part separate water pipe after moulding, and first mould core, second mould core are fitted in rear material groove under the action of drive arrangement respectively in telescopic cooperation, and first mould core inserts the middle part of water pipe, and second mould core designs two, and is respectively pasted on the two end faces of water pipe.

Description

Technical Field

[0001] This utility model belongs to the field of sanitary ware technology, and in particular refers to a mold structure for an integrated valve body structure. Background Technology

[0002] Early H-type faucet bodies (commonly known as H-shaped water channels) were primarily cast from copper. This could leave metal particles and other impurities in the water, posing a risk to water safety. To address this, the industry developed a one-piece copper-plastic valve body, using copper leads as connectors, with the remaining parts injection molded. (Reference) Figure 1 , Figure 2 As shown, an integrated copper-plastic valve body generally includes a pre-formed water pipe 100 and a pipe foot 200 (usually made of copper), as well as a valve body 300 formed by secondary injection molding. During the production process, the water pipe 100 and the pipe foot 200 are first placed into the mold cavity of the mold, and then the valve body 300 is integrally injection molded on the surface of the water pipe 100 and inside the pipe foot 200.

[0003] In order to form the valve body 300 on the surface of the water pipe 100 with high quality, it needs to be precisely positioned in the mold cavity. For example, the solution disclosed in the utility model patent CN101664980B, "Method for manufacturing an integrated plastic faucet body component and plastic faucet body component", is to set several positioning blocks on the surface (mainly the side) of the water pipe. After the water pipe is placed into the mold cavity, the positioning blocks abut against the inner wall of the mold cavity, which plays a positioning role for the water pipe, preventing it from being pushed off course by the material flow, and ensuring that the slider core can be accurately inserted into the core.

[0004] However, this method has the following drawbacks in practical applications: because the positioning block abuts against the inner wall of the mold cavity, the valve body does not completely wrap the water pipe during the secondary injection molding, but only covers the side of the positioning block, which may lead to safety hazards in the final product; especially when there are insufficient mold temperature or material temperature, or oil stains on the surface of the water pipe during the production process, resulting in insufficient bonding force during the secondary injection molding, the joint between the valve body and the positioning block is more prone to leakage. Utility Model Content

[0005] The main purpose of this utility model is to provide a mold structure for an integrated valve body, which solves the problems existing in the prior art and can completely wrap the water pipe during the secondary injection molding of the valve body, thereby improving product quality.

[0006] To achieve the above objectives, the solution of this utility model is: A mold structure for a one-piece valve body is disclosed, used for secondary injection molding of the valve body on the surface of a water pipe. The mold includes an openable front mold and a rear mold, a pre-limiting block, a first mold core, a second mold core, and a driving device. The front mold has a front material groove, and the rear mold has a rear material groove. After mold closing, the front and rear material grooves enclose a material cavity matching the outer contour of the valve body. The pre-limiting block elastically fits within the rear material groove and includes a protrusion that telescopically fits on the surface of the rear mold, and a limiting part integrally formed with the protrusion. The limiting part is used to fix the position of the water pipe within the rear material groove. After mold closing, the front mold abuts against the protrusion to disengage the limiting part from the water pipe. The first and second mold cores telescopically fit within the rear material groove under the action of the driving device. The first mold core is inserted into the middle of the water pipe. Two second mold cores are designed, respectively attached to the two end faces of the water pipe.

[0007] The surface of the water pipe is provided with several steps, and none of the steps are in contact with the inner wall of the material cavity.

[0008] The number of pre-limiting blocks is at least two, which are used to fix the left and right parts of the water pipe respectively.

[0009] Preferably, the surface of the water pipe is provided with a raised rib opposite to the limiting part; the limiting part is provided with a notch for the raised rib to be embedded; after the water pipe is placed into the rear material trough, the notches of the two pre-limiting blocks are respectively fitted onto the end positions of the corresponding raised ribs.

[0010] The rear feed trough is provided with a movable groove for the pre-limiting block to move and cooperate, and a guide block is provided in the movable groove; a U-shaped groove is formed between the protrusion and the limiting part, and the U-shaped groove is movably sleeved on the surface of the guide block; a spring for ejecting the pre-limiting block is provided in the movable groove.

[0011] The middle section of the water pipe is provided with a through hole for the end of the first mold core to be inserted, and an anti-rotation rib is provided in the through hole; the end of the first mold core is provided with a plug that matches the cross-section of the through hole.

[0012] Both ends of the water pipe are provided with arc surfaces; the end of the second mold core is provided with a core post that matches the arc surfaces.

[0013] The driving device drives the first mold core and the second mold core to extend and retract relative to the rear material groove through hydraulic drive, pneumatic drive, or motor combined with lead screw drive.

[0014] After adopting the above technical solution, the present invention has the following technical effects: This invention utilizes a pre-positioning block with elastic fit within the rear material groove to pre-position the water pipe during installation, allowing for rapid assembly into the preset position within the material cavity and facilitating the subsequent quick alignment and insertion of the first mold core. During mold closing, the first and second mold cores reach their preset positions under the drive of the drive device; the first mold core inserts into the water pipe, and the second mold core closely adheres to the end face of the water pipe, providing secondary positioning of the water pipe at different positions and directions. Then, the front and rear molds close, compressing the protrusion of the front mold onto the surface of the rear mold, causing the pre-positioning block to automatically disengage from the water pipe. At this point, the water pipe is suspended within the material cavity, ensuring that its surface is completely encased in the injection molding material during subsequent injection molding processes. Therefore, this invention effectively avoids incomplete encapsulation during the secondary injection molding of the valve body, improves the bonding strength between the valve body and the water pipe, and thus enhances production quality. Attached Figure Description

[0015] Figure 1 This is an exploded view of the integrated valve body structure.

[0016] Figure 2 This is a cross-sectional view of the integrated valve body structure.

[0017] Figure 3 This is a partial three-dimensional structural view of a specific embodiment of the present utility model.

[0018] Figure 4 for Figure 3 A three-dimensional view of part of the structure in the mold-open state.

[0019] Figure 5 for Figure 3 A three-dimensional view of part of the structure in the mold-closed state.

[0020] Figure 6 This is a perspective view of the pre-limiting block according to a specific embodiment of the present utility model.

[0021] Figure 7 for Figure 3 The image shows a magnified view of point A in the mold-open state.

[0022] Figure 8 This is a cross-sectional view of the mold opening state of a specific embodiment of the present utility model. Figure 4 (in the BB direction).

[0023] Figure 9 for Figure 3 The image shows a magnified view of point A in the mold-closed state.

[0024] Figure 10 This is a cross-sectional view of the mold-closing state of a specific embodiment of the present utility model. Figure 4 (in the BB direction).

[0025] Figure 11 This is a cross-sectional view of the completed secondary injection molding state according to a specific embodiment of the present invention. Figure 4 (in the BB direction).

[0026] Figure 12 This is a perspective view of the water pipe positioning principle in a specific embodiment of this utility model.

[0027] Figure 13 A cross-sectional view of the water pipe positioning principle in a specific embodiment of this utility model. Figure 1 (Longitudinal section of the mold core).

[0028] Figure 14 A cross-sectional view of the water pipe positioning principle in a specific embodiment of this utility model. Figure 2 (Cross-section of the mold core).

[0029] Figure 15 A cross-sectional view of the water pipe positioning principle in a specific embodiment of this utility model. Figure 3 ( Figure 4 (Central CC direction).

[0030] Explanation of icon numbers: 100 - Water pipe; 101 - Step; 102 - Raised rib; 103 - Perforation; 104 - Anti-rotation rib; 105 - Curved surface; 200-pin; 300 - Valve body; 400 - Front mold; 401 - Front feed trough; 500 - Rear mold; 501 - Rear material groove; 502 - Movable groove; 503 - Guide block; 600 - Pre-limiting block; 601 - Protrusion; 602 - Limiting part; 603 - Notch; 604 - U-shaped groove; 700 - First mold core; 701 - Connector; 800 - Second mold core; 801 - Core pillar; 900 - Drive unit; 1000 - Spring; 2000 - Pin positioning component. Detailed Implementation

[0031] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0032] refer to Figures 1 to 11 As shown, this utility model discloses a mold structure for an integrated valve body structure, which is used to perform secondary injection molding of valve body 300 on the surface of water pipe 100. It includes an openable front mold 400 and a rear mold 500, as well as a pre-limiting block 600, a first mold core 700, a second mold core 800 and a driving device 900. The front mold 400 is provided with a front material groove 401, and the rear mold 500 is provided with a rear material groove 501. After the mold is closed, the front material groove 401 and the rear material groove 501 surround each other to form a material cavity that matches the outer contour of the valve body 300. The pre-limiting block 600 is elastically fitted in the rear material groove 501. It includes a protrusion 601 that telescopically fits on the surface of the rear mold 500, and a limiting part 602 integrally formed with the protrusion 601. The limiting part 602 is used to fix the position of the water pipe 100 in the rear material groove 501. After the mold is closed, the front mold 400 abuts against the protrusion 601 to disengage the limiting part 602 from the water pipe 100. The first mold core 700 and the second mold core 800 are telescopically fitted into the rear material groove 501 under the action of the drive device 900; the first mold core 700 is inserted into the middle of the water pipe 100; the second mold core 800 is designed to have two parts, which are respectively attached to the two end faces of the water pipe 100.

[0033] Through the above solution, this utility model, by designing a pre-limiting block 600 with elastic fit in the rear material groove 501, can pre-position the water pipe 100 when it is installed, so that it can be quickly assembled in the preset position of the material cavity and facilitate the rapid alignment and insertion of the first mold core 700 in the subsequent process. During the mold closing process, the first mold core 700 and the second mold core 800 first reach the preset position under the drive of the drive device 900, that is, the first mold core 700 is inserted into the water pipe 100, and the second mold core 800 is close to the end face of the water pipe 100, and the water pipe 100 is repositioned in different positions and directions. Then, the front mold 400 and the rear mold 500 close the mold again so that the front mold 400 compresses the protrusion 601 protruding from the surface of the rear mold 500, so that the limiting part 602 automatically disengages from the water pipe 100. At this time, the water pipe 100 is in a suspended state in the material cavity, ensuring that the surface of the water pipe 100 can be completely wrapped in the injection plastic during the subsequent injection molding process. Therefore, this utility model can effectively avoid the problem of incomplete coverage when the valve body 300 is injection molded in the second stage, and improve the bonding strength between the valve body 300 and the water pipe 100, thereby improving the production quality.

[0034] The following are specific embodiments of the present invention.

[0035] The surface of the aforementioned water pipe 100 is provided with several triangular, trapezoidal, or other shaped steps 101, and none of the steps 101 contact the inner wall of the material cavity (front material groove 401, rear material groove 501). Therefore, the material flow during secondary injection molding can better melt with the water pipe 100, ultimately improving the bonding strength between the valve body 300 and the water pipe 100, ensuring that the surface of the water pipe 100 is completely encased in the injection molding material and tightly bonded, effectively preventing water leakage. Furthermore, after setting the steps 101, the surface of the water pipe 100 does not have any positioning ribs protruding from or flush with the valve body 300, remaining suspended in the material cavity. Specifically, when the steps 101 are designed as triangles or trapezoids, a large slope can be designed for ease of molding; if it is a trapezoidal step 101, its smaller end width is generally no greater than 0.3mm; in addition, the top of the triangular step 101 can be rounded.

[0036] At least two pre-limiting blocks 600 are designed, one for the left and one for the right side of the water pipe 100. Through this symmetrical design, the pre-limiting blocks 600 can more stably position the water pipe 100, preventing displacement or shaking during installation. Furthermore, to enhance the durability of the pre-limiting blocks 600, they can be made of engineering plastics or metals with high wear resistance and fatigue resistance, and anti-slip textures can be added to their surface to further improve friction and stability when in contact with the water pipe 100.

[0037] Furthermore, the surface of the water pipe 100 is provided with a raised rib 102 opposite to the limiting part 602; the limiting part 602 is provided with a notch 603 for the raised rib 102 to be embedded; after the water pipe 100 is placed into the rear material trough 501, the notches 603 of the two pre-limiting blocks 600 are respectively fitted onto the end positions of the corresponding raised ribs 102, which plays a role in quick positioning.

[0038] The aforementioned rear material groove 501 is provided with a movable groove 502 for the pre-limiting block 600 to move and engage. A guide block 503 is provided within the movable groove 502. A U-shaped groove 604 is formed between the protrusion 601 and the limiting part 602, and the U-shaped groove 604 is movably fitted onto the surface of the guide block 503. That is, the protrusion 601 and the limiting part 602 are respectively movably engaged on both sides of the guide block 503. A spring 1000 for ejecting the pre-limiting block 600 is provided within the movable groove 502. During the mold closing process, the guide block 503 can effectively limit the movement trajectory of the pre-limiting block 600, ensuring its smooth and precise movement. Through this structural design, the pre-limiting block 600 can slide smoothly along the guide block 503 when subjected to pressure from the front mold 400, avoiding jamming or displacement caused by uneven force. In addition, the depth and width of the movable groove 502 are precisely calculated to ensure the flexible extension and retraction of the pre-limit block 600 and to prevent excessive shaking during its movement, thereby further improving the positioning accuracy.

[0039] The aforementioned water pipe 100 has a through hole 103 in its middle section for inserting the end of the first mold core 700, and an anti-rotation rib 104 is provided inside the through hole 103; the end of the first mold core 700 has a connector 701 that matches the cross-section of the through hole 103. See also... Figures 12 to 15 Through the cooperation of the connector 701 and the perforation 103, precise docking between the first mold core 700 and the water pipe 100 can be achieved. Simultaneously, the design of the anti-rotation rib 104 effectively prevents the first mold core 700 from rotating during insertion, thus ensuring the positional stability of the water pipe 100 within the material cavity. Furthermore, the shape and dimensions of the connector 701 are optimized, such as the rounded corners on its end face, which provide a guiding effect when inserted into the perforation 103, further improving assembly efficiency and precision. It should be noted that the perforation 103 is part of the design of the water pipe 100 itself, ultimately connecting to the valve body 300 to form a water passage. Inserting the first mold core 700 into this perforation 103 serves both for positioning and to prevent material flow from entering the interior of the water pipe 100 during secondary injection molding.

[0040] Both ends of the aforementioned water pipe 100 are provided with arc surfaces 105; the end of the second mold core 800 is provided with a core post 801 that matches the arc surface 105. Therefore, see... Figures 12 to 15 By cooperating with the core post 801, the second mold core 800 can be fixed to the end of the water pipe 100 to prevent shaking. In addition, the shape of the arc surface 105 also matches the internal water channel of the valve body 300 to avoid protrusion.

[0041] The aforementioned front material groove 401 and rear material groove 501 also include recessed portions for positioning the pins 200. Specifically, these recesses are used to prevent the pin positioning components 2000 from shifting. The pins 200 are threadedly embedded within the pin positioning components 2000 to prevent displacement. During subsequent demolding, the pin positioning components 2000 are unscrewed from the pins 200. Specifically, the pins 200 can be copper or plastic, ultimately forming a copper-plastic valve body or an all-plastic valve body.

[0042] The aforementioned drive device 900 may be equipped with hydraulic cylinders or pneumatic cylinders corresponding to the first mold core 700 and the second mold core 800, respectively, to drive the axial movement of the first mold core 700 and the second mold core 800, thereby realizing the material entry and exit cavities (front material groove 401 and rear material groove 501) of the ends of the first mold core 700 and the second mold core 800, respectively. In addition, the drive of the mold core can also adopt a motor plus lead screw drive method, which allows for more precise stroke control and avoids excessive impact force on the water pipe 100.

[0043] This utility model also discloses a molding method using the above-mentioned mold structure, including: Step 1: With the front mold 400 and the rear mold 500 in the open state, the water pipe 100 is placed into the rear material groove 501 by manual or mechanical means, and the water pipe 100 is fixed by the limiting part 602 of the pre-limiting block 600. Step 2: The driving device 900 drives the first mold core 700 and the second mold core 800 to extend into the rear material groove 501 respectively. The end of the first mold core 700 is inserted into the middle of the water pipe 100, and the second mold core 800 is attached to the end face of the water pipe 100. Step 3: The front mold 400 and the rear mold 500 begin to close. After the front mold 400 contacts the protrusion 601 of the pre-limiting block 600, it is compressed. The limiting part 602 is separated from the water pipe 100, and the water pipe 100 is in a suspended state. Step 4: After the front mold 400 and the rear mold 500 are closed, the injection molding material is injected to form the valve body 300.

[0044] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A mold structure for an integrated valve body, used for secondary injection molding of the valve body on the surface of a water pipe, characterized in that: It includes an openable front mold and a rear mold, as well as a pre-limiting block, a first mold core, a second mold core, and a driving device; The front mold is provided with a front material groove, and the rear mold is provided with a rear material groove. After the molds are closed, the front material groove and the rear material groove surround each other to form a material cavity that matches the outer contour of the valve body. The pre-limiting block is elastically fitted in the rear material groove, and includes a protrusion that telescopically fits on the surface of the rear mold, and a limiting part integrally formed with the protrusion. The limiting part is used to fix the position of the water pipe in the rear material groove. After the mold is closed, the front mold abuts against the protrusion to disengage the limiting part from the water pipe. The first mold core and the second mold core are telescopically fitted into the rear material groove under the action of the driving device; the first mold core is inserted into the middle of the water pipe; the second mold core is designed to have two parts, which are respectively attached to the two end faces of the water pipe.

2. The mold structure for the integrated valve body structure as described in claim 1, characterized in that: The surface of the water pipe is provided with several steps, and none of the steps are in contact with the inner wall of the material cavity.

3. The mold structure for the integrated valve body structure as described in claim 1, characterized in that: The number of pre-limiting blocks is at least two, which are used to fix the left and right parts of the water pipe respectively.

4. The mold structure for the integrated valve body structure as described in claim 3, characterized in that: The surface of the water pipe is provided with a raised rib opposite to the limiting part; the limiting part is provided with a notch for the raised rib to be embedded; after the water pipe is placed into the rear material trough, the notches of the two pre-limiting blocks are respectively fitted onto the end positions of the corresponding raised ribs.

5. The mold structure for the integrated valve body structure as described in claim 1, characterized in that: The rear feed trough is provided with a movable groove for the pre-limiting block to move and cooperate, and a guide block is provided in the movable groove; a U-shaped groove is formed between the protrusion and the limiting part, and the U-shaped groove is movably sleeved on the surface of the guide block; a spring for ejecting the pre-limiting block is provided in the movable groove.

6. The mold structure for the integrated valve body structure as described in claim 1, characterized in that: The middle section of the water pipe is provided with a through hole for the end of the first mold core to be inserted, and an anti-rotation rib is provided in the through hole; the end of the first mold core is provided with a plug that matches the cross-section of the through hole.

7. The mold structure for the integrated valve body structure as described in claim 1, characterized in that: Both ends of the water pipe are provided with arc surfaces; the end of the second mold core is provided with a core post that matches the arc surfaces.

8. The mold structure for the integrated valve body structure as described in claim 1, characterized in that: The driving device drives the first mold core and the second mold core to extend and retract relative to the rear material groove through hydraulic drive, pneumatic drive, or motor combined with lead screw drive.

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