Demolding structure for plastic mold

Abstract

The utility model relates to a demoulding structure for plastic mould, including respectively front and back and mutually cooperate initiative block and forming block, and respectively embed in initiative block rear side and forming block front side and mutually cooperate and move core block and fixed core block, still include the main part of being equipped with between initiative block and forming block and with move core block and fixed core block all mutually cooperate, the main part includes mutually cooperate's first mobile core-pulling unit, second mobile core-pulling unit and rotary core-pulling unit, rotary core-pulling unit includes rotatable connection in the inside of forming block front side and between first sliding block and fixed core block's gear, the sector block of concentric fixed in gear front end and movable connection in first sliding block front side to have arc movement function, the rack of movable of being equipped with in the inside of forming block front side to have up and down vertical movement function and vertically engaged in gear right side, and the third oil cylinder of fixed on forming block upper side outer wall, the utility model has reduced mould specific gravity and reduced material, reduced manufacturing cost and installation complexity degree.

Description

Technical Field

[0001] This utility model relates to a demolding structure for plastic molds. Background Technology

[0002] Plastic molds are industrial molds used for molding thermosetting plastics. Molten plastic is injected into a closed cavity by an injection molding machine to complete hardening and shaping. The demolding structure is a mechanism in injection molds used to solve the problem of not being able to demold complex plastic parts directly. Demolding structures are mainly divided into three types: passive demolding, active demolding, and manual demolding. In actual use, the three types are often combined.

[0003] Although plastic bends can be extracted outwards by a rotary demolding mechanism that moves the arc-shaped core column inside the arc segment in an arc shape, most existing plastic bend injection molds rely on motors. This involves connecting the swinging side of the arc-shaped core column to the motor's rotating shaft, fixing a gear to the shaft, and then mounting an arc-shaped rack on a fixed module that meshes with the gear. When the motor's shaft rotates, the gear rolls along the rack, causing the motor to move in an arc shape, which in turn causes the arc-shaped core column to rotate synchronously, thus slowly detaching it from the molded plastic bend. However, this structure requires ample space for the motor's displacement trajectory, resulting in a large mold size and material usage. Furthermore, conventional injection molding machines cannot accommodate this, leading to high manufacturing costs and installation complexity. Additionally, the electrical wiring for the motor's power supply is also required, increasing the difficulty of manufacturing and debugging, and thus requiring further improvement. Utility Model Content

[0004] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a demolding structure for plastic molds that reduces the mold volume and material usage, greatly reduces manufacturing costs and installation complexity, and also reduces the difficulty of manufacturing and debugging.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: a demolding structure for a plastic mold, comprising an active block and a molding block that are respectively positioned front to back and cooperate with each other, and a moving core block and a fixed core block that are respectively embedded on the rear side of the active block and the front side of the molding block and cooperate with each other, characterized in that: It also includes a main body disposed between the active block and the forming block and cooperating with both the moving core block and the fixed core block; the main body includes a first moving core pulling unit, a second moving core pulling unit and a rotating core pulling unit that cooperate with each other; The first movable core-pulling unit includes a first slider that is movably embedded in the front side of the molding block to have the function of tilting left and right and is located to the left of the fixed core block, a first oil cylinder fixed on the left outer wall of the molding block, and an end block fixed on the right outer wall of the first slider. The telescopic end of the first oil cylinder is tilted to the right and is set parallel to the moving direction of the first slider and fixed on the first slider. The second movable core-pulling unit includes a second slider that is movably embedded in the front side of the molding block to have the function of vertical movement and is located above the fixed core block, a straight core column that is vertically fixed on the lower outer wall of the second slider, and a second hydraulic cylinder that is fixed on the upper outer wall of the molding block. The telescopic end of the second hydraulic cylinder is vertically downward and fixed on the second slider. The rotating core-pulling unit includes a gear rotatably connected to the inside of the front side of the molding block and located between the first slider and the core block; a fan-shaped block concentrically fixed to the front end of the gear and movably connected to the front side of the first slider to have an arc-shaped movement function; a rack movably disposed inside the front side of the molding block to have a vertical movement function and vertically meshing with the right side of the gear; and a third hydraulic cylinder fixed to the upper outer wall of the molding block, wherein the telescopic end of the third hydraulic cylinder is vertically downward and fixed to the rack. An arc-shaped core column is formed outward on the right outer wall of the sector block.

[0006] Preferably, the upper edge of the end face of the fixed core block is provided with a vertically distributed first straight forming groove, and correspondingly, the upper edge of the end face of the moving core block is provided with a vertically distributed second straight forming groove that cooperates with the first straight forming groove.

[0007] Preferably, a first arc-shaped forming groove is formed between the lower inner wall of the first straight forming groove and the left edge of the end face of the fixed core block. Correspondingly, a second arc-shaped forming groove that cooperates with the first arc-shaped forming groove is formed between the lower inner wall of the second straight forming groove and the left edge of the end face of the moving core block.

[0008] Preferably, the outer wall of the straight core column is in contact with the inner walls of the first straight forming groove and the second straight forming groove, and the outer wall of the arc-shaped core column is in contact with the inner walls of the first arc-shaped forming groove and the second arc-shaped forming groove.

[0009] Preferably, an arc-shaped positioning hole that cooperates with the arc-shaped core is provided between the left and right outer walls of the end block, and an annular forming cavity that is concentrically surrounded around the arc-shaped positioning hole is also provided on the right outer wall of the end block, and a concentric convex ring is formed on the bottom surface of the annular forming cavity.

[0010] Preferably, the active block is further provided with a first corner core-pulling assembly. The first corner core-pulling assembly includes a first inclined strip that is obliquely inserted into the active block and a first seat block located in front of the active block. The front end of the first inclined strip extends into the connection between the second straight forming groove and the second arc forming groove, and the rear end of the first inclined strip is movably connected to the first seat block to have the function of tilting left and right.

[0011] Preferably, the molding block is further provided with a second corner core-pulling assembly. The second corner core-pulling assembly includes a second inclined strip that is obliquely inserted into the molding block and a second seat block located behind the molding block. The front end of the second inclined strip extends into the connection between the first straight molding groove and the first arc molding groove, and the rear end of the second inclined strip is movably connected to the second seat block to have the function of tilting left and right.

[0012] Compared with the prior art, the advantages of this utility model are as follows: This utility model does not require a motor to drive the sector block to swing. Instead, it uses the third oil cylinder in the rotating core-pulling unit and the meshing connection of the rack and gear to drive the sector block to swing. Since the extension and retraction end of the third oil cylinder and the movement of the rack are linear movements and do not need to swing themselves, there is no need to reserve space, thereby reducing the mold volume and material usage. Moreover, conventional injection molding machines can handle the task, thus reducing manufacturing costs and installation complexity. In addition, there is no need to lay electrical wiring, which reduces the difficulty of manufacturing and debugging. Attached Figure Description

[0013] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings: Figure 1 This is an exploded view of the left front side of this utility model; Figure 2 This is a structural diagram of the left front side of the core block of this utility model; Figure 3 This is a structural diagram of the left rear side of the moving core block of this utility model; Figure 4 This is a structural diagram of the right rear side of the end block of this utility model; Figure 5 This is a structural diagram of the left rear side of the first inclined strip of this utility model; Figure 6 This is a structural diagram of the right rear side of the second corner core-pulling assembly of this utility model. Detailed Implementation

[0014] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0015] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0016] like Figures 1-6 As shown, a demolding structure for a plastic mold includes an active block 2 and a molding block 1 that are respectively positioned at the front and rear and cooperate with each other, as well as a moving core block 5 and a fixed core block 4 that are respectively embedded on the rear side of the active block 2 and the front side of the molding block 1 and cooperate with each other. It also includes a main body 3 located between the active block 2 and the forming block 1, which cooperates with both the moving core block 5 and the fixed core block 4; the main body 3 includes a first moving core pulling unit, a second moving core pulling unit and a rotating core pulling unit that cooperate with each other. The first movable core-pulling unit includes a first slider 31 movably embedded in the front side of the molding block 1 to have the function of tilting left and right and located to the left of the fixed core block 4, a first hydraulic cylinder 32 fixed on the left outer wall of the molding block 1, and an end block 33 fixed on the right outer wall of the first slider 31. The telescopic end of the first hydraulic cylinder 32 is tilted to the right and is set parallel to the moving direction of the first slider 31 and fixed on the first slider 31. The second movable core-pulling unit includes a second slider 34 that is movably embedded in the front side of the molding block 1 to have the function of vertical movement and is located above the fixed core block 4, a straight core column 35 that is vertically fixed on the lower outer wall of the second slider 34, and a second hydraulic cylinder 36 that is fixed on the upper outer wall of the molding block 1. The telescopic end of the second hydraulic cylinder 36 is vertically downward and fixed on the second slider 34. The rotating core-pulling unit includes a gear 39 rotatably connected to the front interior of the molding block 1 and located between the first slider 31 and the core-fixing block 4; a fan-shaped block 310 concentrically fixed to the front end of the gear 39 and movably connected to the front of the first slider 31 to have an arc-shaped movement function; a rack 37 movably disposed inside the front interior of the molding block 1 to have a vertical movement function and vertically meshing with the right side of the gear 39; and a third hydraulic cylinder 38 fixed to the upper outer wall of the molding block 1, with the telescopic end of the third hydraulic cylinder 38 vertically downward and fixed to the rack 37. An arc-shaped core column 3101 is formed outward on the right outer wall of the sector block 310.

[0017] The upper edge of the end face of the fixed core block 4 is provided with a vertically distributed first straight forming groove 41, and correspondingly, the upper edge of the end face of the moving core block 5 is provided with a vertically distributed second straight forming groove 51 that cooperates with the first straight forming groove 41.

[0018] A first arc-shaped forming groove 42 is provided between the lower inner wall of the first straight forming groove 41 and the left edge of the end face of the fixed core block 4. Correspondingly, a second arc-shaped forming groove 52 that cooperates with the first arc-shaped forming groove 42 is provided between the lower inner wall of the second straight forming groove 51 and the left edge of the end face of the moving core block 5.

[0019] The outer wall of the straight core 35 is in contact with the inner wall of the first straight forming groove 41 and the second straight forming groove 51, and the outer wall of the arc-shaped core 3101 is in contact with the inner wall of the first arc-shaped forming groove 42 and the second arc-shaped forming groove 52.

[0020] An arc-shaped positioning hole 332 that cooperates with the arc-shaped core post 3101 is provided between the left and right outer walls of the end block 33. An annular forming cavity 331 that is concentrically surrounded around the arc-shaped positioning hole 332 is also provided on the right outer wall of the end block 33. A concentric convex ring 333 is also formed on the bottom surface of the annular forming cavity 331.

[0021] The active block 2 is also provided with a first corner core-pulling assembly 6. The first corner core-pulling assembly 6 includes a first inclined strip 61 that is obliquely inserted into the active block 2 and a first seat block 62 located in front of the active block 2. The front end of the first inclined strip 61 extends into the connection between the second straight forming groove 51 and the second arc forming groove 52. The rear end of the first inclined strip 61 is movably connected to the first seat block 62 to have the function of tilting left and right.

[0022] The front end of the first inclined strip 61 forms a first forming arc surface 611 that cooperates with the inner walls of the second straight forming groove 51 and the second arc forming groove 52. A cavity 612 is provided on the first forming arc surface 611. Several sleeve forming modules are formed outward from top to bottom on the bottom surface of the cavity 612. The sleeve forming module includes a core rod 614 that is perpendicular to the bottom surface of the cavity 612 and two side blocks 613 that are symmetrically arranged on the left and right sides of the core rod 614.

[0023] The molding block 1 is also provided with a second corner core-pulling assembly 7. The second corner core-pulling assembly 7 includes a second inclined strip 71 that is obliquely inserted into the molding block 1 and a second seat block 72 located behind the molding block 1. The front end of the second inclined strip 71 extends into the connection between the first straight molding groove 41 and the first arc molding groove 42. The rear end of the second inclined strip 71 is movably connected to the second seat block 72 to have the function of tilting left and right.

[0024] A rectangular notch 334 is also provided on one side edge of the opening of the annular forming cavity 331. A rectangular protrusion 335 is formed outward on the bottom surface of the rectangular notch 334, and a waist-shaped protrusion 336 is formed outward on the end surface of the rectangular protrusion 335.

[0025] Working principle: An end plate that can move back and forth is provided on the front side of the active block 2, and a bottom plate that can move back and forth is provided on the rear side of the molding block 1. An ejection mechanism is provided between the bottom plate and the molding block 1. The end plate and the bottom plate are then installed on the moving system and the machine base in the injection molding machine, respectively. The first seat block 62 in the first corner core pulling assembly 6 is fixed on the end plate, and the second seat block 72 in the second corner core pulling assembly 7 is connected to the ejection mechanism.

[0026] First, operate the moving system to drive the end plate to move backward while keeping the active block 2 stationary, thereby driving the first seat block 62 to move synchronously, thus forcing the first inclined bar 61 to tilt backward until its front end extends into the connection between the second straight forming groove 51 and the second arc forming groove 52; at the same time, operate the ejection mechanism to drive the second seat block 72 to move forward, thereby forcing the second inclined bar 71 to tilt forward until its front end extends into the connection between the first straight forming groove 41 and the first arc forming groove 42.

[0027] The moving system is then operated to drive both the active block 2 and the moving core block 5 to move backward until the rear outer wall of the active block 2 is in contact with the front outer wall of the forming block 1. At this time, the end face of the moving core block 5 is also in contact with the end face of the fixed core block 4. The above structure and principle are existing technologies. At this time, the first straight forming groove 41 on the fixed core block 4 is in contact with the second straight forming groove 51 on the moving core block 5; the first arc forming groove 42 on the fixed core block 4 is in contact with the second arc forming groove 52 on the moving core block 5.

[0028] Next, the telescopic end of the first cylinder 32 in the first moving core-pulling unit is extended outward to drive the first slider 31 and the end block 33 to move to the right towards the fixed core block 4 until the right outer wall of the end block 33 is in contact with the left outer wall of the fixed core block 4; then, the telescopic end of the third cylinder 38 in the rotating core-pulling unit is retracted inward to drive the rack 37 to move upward, and then, with the help of the gear 39, the sector block 310 is driven to rotate counterclockwise, thereby causing the end of the arc-shaped core column 3101 on the sector block 310 to pass through. The arc-shaped positioning hole 332 in the end block 33 gradually extends into the space between the first arc-shaped forming groove 42 and the second arc-shaped forming groove 52 that are joined together; at the same time, the telescopic end of the second cylinder 36 in the second moving core pulling unit is driven to extend outward so as to drive the straight core column 35 to move downward with the help of the second slider 34, thereby causing the end of the straight core column 35 to gradually extend into the space between the first straight forming groove 41 and the second straight forming groove 51 that are joined together, until the end of the straight core column 35 is attached to the end of the arc-shaped core column 3101.

[0029] Next, the molten material is introduced into the space between the first straight forming groove 41 and the second straight forming groove 51 and the space between the first arc forming groove 42 and the second arc forming groove 52 through the gate in the end plate 4 and the runner in the active block 2. After cooling, an arc-shaped pipe is formed.

[0030] After molding is completed, the telescopic end of the third cylinder 38 in the rotating core-pulling unit is first driven to extend outward to drive the fan-shaped block 310 to rotate clockwise, thereby causing the end of the arc-shaped core column 3101 to slowly leave the arc-shaped tube until it leaves the arc-shaped positioning hole 332 in the end block 33; at the same time, the telescopic end of the second cylinder 36 in the second moving core-pulling unit is driven to retract inward to drive the straight core column 35 to move upward, until the end of the straight core column 35 completely leaves the arc-shaped tube; then the telescopic end of the first cylinder 32 in the first moving core-pulling unit is driven to retract inward to drive the first slider 31 and the end block 33 to move to the left away from the fixed core block 4; finally, the moving system is operated to drive the end plate to move forward, thereby driving the active block 2 and the moving core block 5 to move forward to leave the molding block 1 and the fixed core block 4 respectively, and the arc-shaped tube is pushed forward by the ejection mechanism.

[0031] This invention does not require a motor to drive the sector block 310 to swing. Instead, it uses the third hydraulic cylinder 38 in the rotating core-pulling unit and the meshing connection between the rack 37 and the gear 39 to drive the sector block 310 to swing. Since the extension and retraction end of the third hydraulic cylinder 38 and the movement of the rack 37 are linear movements and do not need to swing themselves, there is no need to reserve space, thereby reducing the mold volume and material usage. Moreover, conventional injection molding machines can handle the task, thus reducing manufacturing costs and installation complexity. In addition, there is no need to lay electrical wiring, which reduces the difficulty of manufacturing and debugging.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A demolding structure for a plastic mold, comprising an active block and a molding block that are respectively positioned front to back and cooperate with each other, and a moving core block and a fixed core block that are respectively embedded on the rear side of the active block and the front side of the molding block and cooperate with each other, characterized in that: It also includes a main body disposed between the active block and the forming block and cooperating with both the moving core block and the fixed core block; the main body includes a first moving core pulling unit, a second moving core pulling unit and a rotating core pulling unit that cooperate with each other; The first movable core-pulling unit includes a first slider that is movably embedded in the front side of the molding block to have the function of tilting left and right and is located to the left of the fixed core block, a first oil cylinder fixed on the left outer wall of the molding block, and an end block fixed on the right outer wall of the first slider. The telescopic end of the first oil cylinder is tilted to the right and is set parallel to the moving direction of the first slider and fixed on the first slider. The second movable core-pulling unit includes a second slider that is movably embedded in the front side of the molding block to have the function of vertical movement and is located above the fixed core block, a straight core column that is vertically fixed on the lower outer wall of the second slider, and a second hydraulic cylinder that is fixed on the upper outer wall of the molding block. The telescopic end of the second hydraulic cylinder is vertically downward and fixed on the second slider. The rotating core-pulling unit includes a gear rotatably connected to the inside of the front side of the molding block and located between the first slider and the core block; a fan-shaped block concentrically fixed to the front end of the gear and movably connected to the front side of the first slider to have an arc-shaped movement function; a rack movably disposed inside the front side of the molding block to have a vertical movement function and vertically meshing with the right side of the gear; and a third hydraulic cylinder fixed to the upper outer wall of the molding block, wherein the telescopic end of the third hydraulic cylinder is vertically downward and fixed to the rack. An arc-shaped core column is formed outward on the right outer wall of the sector block.

2. The demolding structure for a plastic mold according to claim 1, characterized in that, The fixed core block has a vertically distributed first straight forming groove on its upper edge end face. Correspondingly, the moving core block has a vertically distributed second straight forming groove on its upper edge end face that cooperates with the first straight forming groove.

3. The demolding structure for a plastic mold according to claim 2, characterized in that, A first arc-shaped forming groove is formed between the lower inner wall of the first straight forming groove and the left edge of the end face of the fixed core block. Correspondingly, a second arc-shaped forming groove is formed between the lower inner wall of the second straight forming groove and the left edge of the end face of the moving core block, which cooperates with the first arc-shaped forming groove.

4. The demolding structure for a plastic mold according to claim 3, characterized in that, The outer wall of the straight core column mates with the inner walls of the first straight forming groove and the second straight forming groove, and the outer wall of the arc-shaped core column mates with the inner walls of the first arc-shaped forming groove and the second arc-shaped forming groove.

5. The demolding structure for a plastic mold according to claim 1, characterized in that, An arc-shaped positioning hole is provided between the left and right outer walls of the end block to cooperate with the arc-shaped core column. An annular forming cavity is also provided on the right outer wall of the end block, which is concentrically surrounded by the arc-shaped positioning hole. A concentric convex ring is also formed on the bottom surface of the annular forming cavity.

6. The demolding structure for a plastic mold according to claim 3, characterized in that, The active block is also provided with a first corner core-pulling assembly. The first corner core-pulling assembly includes a first inclined strip that is obliquely inserted into the active block and a first seat block located in front of the active block. The front end of the first inclined strip extends into the connection between the second straight forming groove and the second arc forming groove, and the rear end of the first inclined strip is movably connected to the first seat block to have the function of tilting left and right.

7. The demolding structure for a plastic mold according to claim 2, characterized in that, The molding block is also provided with a second corner core-pulling assembly. The second corner core-pulling assembly includes a second inclined strip that is obliquely inserted into the molding block and a second seat block located behind the molding block. The front end of the second inclined strip extends into the connection between the first straight molding groove and the first arc molding groove, and the rear end of the second inclined strip is movably connected to the second seat block to have the function of tilting left and right.

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