Demolding structure of rubber product molding injection mold

Abstract

The invention relates to the technical field of injection molds, in particular to a demolding structure of a rubber product molding injection mold, which comprises a hand mold, a mounting rack, an air cylinder and a piston rod, the hand mold comprises a wrist, a palm, fingers and fingertips, a mold lifting assembly and a demolding assembly are arranged in the hand mold, a pre-demolding rod and a mold lifting plate are arranged on the mold lifting assembly, and a plurality of demolding rods are arranged on the demolding assembly. In the using process of the demolding structure, the air cylinder drives the piston rod to push the pre-demolding rod to the fingertip direction, the mold lifting assembly pushes a glove on the wrist to the fingertip direction through the mold lifting plate, and after the mold lifting plate moves to the designated position, the demolding assembly drives the multiple demolding rods to eject the fingertips outwards through the pre-demolding rod at the same time; the problem that the quality of finished gloves is reduced due to irreversible deformation caused by non-uniform stress of the gloves when only fingertips of the gloves are subjected to downward pulling force is avoided, the stability of the demolding structure of the rubber product molding injection mold is ensured, and the finished product quality of the gloves is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to a demoulding structure of an injection mold for forming rubber products. Background Art

[0002] Injection molding of rubber products is a conventional processing method. The corresponding injection mold is made according to the template of the rubber finished product. The heated and melted rubber material is injected into the mold cavity by high pressure. After cooling and solidification, the rubber finished product is obtained. The rubber finished product is ejected with the ejection mold mechanism, and it can be shipped after a period of cooling. Among them, the demolding structure of the rubber product molding injection mold is a very important link in the design of rubber products, which affects the molding quality and production efficiency of rubber products. At present, in the production process of rubber gloves, there are a large number of hand molds that need to be demolded. The labor of simply demolding the gloves one by one manually is huge, so demolding devices are usually used for demolding, but the existing demolding devices are inefficient, and the adhesion between the gloves and the hand mold is large. The gloves are directly pulled downward during demolding, and the glove breakage rate is high.

[0003] In view of the above problems, the prior art has proposed some solutions. For example, Chinese patent application number: CN202310007579.3 discloses a demoulding device for glove production, which includes a support seat and two rotating cylinders that can rotate toward each other on the support seat. The rotation axes of the two rotating cylinders are parallel to each other and are in the same horizontal plane. The rotating cylinder has an arc portion and a plane portion. The circles where the two arc portions are located are tangent, so that when the two rotating cylinders rotate toward each other, the arc portions can abut against each other; in the demoulding process, when the rotating cylinder rotates, the gloves can be pulled down and separated through the arc portion and the arc plate in turn, thereby improving the efficiency of glove demoulding. When the arc plate demoulds the gloves, the arc plate slides along the radial direction of the cylinder, which can make the gloves The sleeve swings back and forth during demoulding, thereby reducing the adhesion between the glove and the hand mold; however, in the above scheme, when the glove is pulled down to be detached, since the wrist of the glove is relatively smaller than the palm, the fingertips and wrist are subjected to force at the same time when the glove is pulled down, and the force directions are opposite. Although the arc plate can make the glove swing back and forth during demoulding when the arc plate slides along the radial direction of the cylinder, reducing the adhesion between the glove and the hand mold, only the lower end of the glove is subjected to force when the arc plate slides along the radial direction of the cylinder, and the upper end of the glove will generate a reaction force at the wrist because the size of the wrist is smaller than the size of the palm. When the rotating cylinder continuously applies tension to the fingertips of the glove, the tension of the rotating cylinder is likely to cause irreversible deformation of the glove, thereby causing the quality of the finished glove to deteriorate.

[0004] Therefore, a demoulding structure of a rubber product molding injection mold is proposed to solve the problem that only the fingertips of the gloves are subjected to downward pulling force, which leads to uneven force on the gloves and irreversible deformation, thereby causing the quality of the finished gloves to deteriorate. Summary of the invention

[0005] The object of the present invention is to provide a demoulding structure for a rubber product molding injection mold to solve the problem that only the fingertips of the gloves are subjected to downward pulling force, resulting in uneven force on the gloves and irreversible deformation, thereby causing the quality of the finished gloves to decrease.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A demoulding structure for a rubber product molding injection mold comprises a hand mold, a glove and a mounting frame, wherein the hand mold is mounted on the lower end surface of the mounting frame, the glove is sleeved on the hand mold, the hand mold comprises a wrist, a palm, a finger and a fingertip, the hand mold is mounted with the fingertip facing downward, the fingertip is connected to the finger, a cylinder and a piston rod are mounted on the mounting frame, a demoulding assembly and a demoulding assembly are arranged in the hand mold, a pre-demolding rod and a demoulding plate are arranged on the demoulding assembly, the pre-demolding rod is connected to the piston rod, the demoulding plate is connected to the pre-demolding rod, and the demoulding plate is slidably connected to the outer surface of the hand mold, a plurality of demoulding rods are arranged on the demoulding assembly, and the plurality of demoulding rods are arranged on the demoulding assembly. The demoulding rods are respectively slidably connected in a plurality of fingers, and the lower end surfaces of the plurality of demoulding rods are respectively connected to a plurality of fingertips. When the piston rod is pressed to push the pre-demolding rod to move toward the fingertips, the demoulding plate moves along the surface of the hand mold toward the fingertips. After the demoulding plate is completely embedded in the glove and pushes the glove to move toward the finger to a specified position, the pre-demolding rod simultaneously pushes the plurality of demoulding rods to eject the fingertips outward, thereby avoiding the problem that only the fingertips of the gloves are subjected to a downward pulling force, resulting in uneven force on the gloves and irreversible deformation, which in turn leads to a decrease in the quality of the finished gloves. The stability of the demoulding structure of the injection mold for forming rubber products is ensured, and the quality of the finished gloves is ensured.

[0008] Optionally, the demolding assembly can be manual demolding, mechanical demolding or robot demolding. All three demolding assemblies can demold the gloves. Manual demolding manually props up the rear end of the glove from the mold, but the manual demolding efficiency is low; mechanical demolding physically clamps the rear end of the glove and lifts it up, but the mechanical demolding is affected by mechanical wear and has a limited service life; robot demolding clamps the rear end of the glove and props up the glove from the mold, but the initial investment in the robot is too large and is not suitable for small workshops; therefore, the three demolding assemblies are not preferred solutions of the present invention.

[0009] Preferably, the demolding assembly comprises a rubber pushing plate, a demolding frame, a demolding spring and a return coil spring, the rubber pushing plate is mounted on one end of the demolding plate close to the mounting frame, the demolding frame is slidably connected to the pre-stripping rod, the demolding spring is sleeved on the pre-stripping rod, and the upper and lower ends of the demolding spring are respectively connected to the mounting frame and the demolding frame, one end of the demolding plate close to the mounting frame is hinged to the demolding frame, and the return coil spring is mounted at the hinge between the demolding plate and the demolding frame, so as to avoid the problem that only the fingertips of the gloves are subjected to the downward pulling force, resulting in uneven force on the gloves and irreversible deformation, thereby causing the quality of the finished gloves to decline, thereby ensuring the stability of the demolding structure of the injection mold for forming rubber products and the quality of the finished gloves.

[0010] Preferably, the stripping plate is in the shape of a right triangle, and one end close to the fingertips is an acute angle, the right-angled side of the stripping plate is in close contact with the outer surface of the hand mold, and the hinged portion between the stripping plate and the stripping frame is located on the side of the stripping plate close to one end of the mounting frame and away from the hand mold, thereby avoiding the problem that when the stripping plate strips the gloves, the gloves are subjected to uneven force and irreversible deformation due to excessive friction between the gloves and the hand mold, thereby reducing the quality of the finished gloves, thereby ensuring the stability of the stripping structure of the injection mold for forming rubber products and the quality of the finished gloves.

[0011] Preferably, an adaptable section is provided on one end of the demoulding plate close to the wrist, an adaptable spring is installed inside the adaptable section, and the adaptable section is made of wear-resistant flexible material, thereby avoiding the problem that the gloves are pierced by the front end of the demoulding plate due to the tilting of the front end of the demoulding plate when demoulding the gloves, thereby reducing the quality of the finished gloves, thereby ensuring the safety of the demoulding structure of the injection mold for forming rubber products and ensuring the quality of the finished gloves.

[0012] Optionally, the demoulding component can be manual demoulding, mechanical vibration demoulding or robot demoulding. All of the above three demoulding components can demould the gloves. Manual demoulding removes the gloves from the mold manually, but the manual demoulding efficiency is low; mechanical vibration demoulding physically clamps the fingertips of the gloves and removes the gloves from the mold by pulling and vibrating, but the mechanical vibration demoulding is affected by mechanical wear and has a limited lifespan; robot demoulding removes the gloves from the mold by clamping the gloves by the robot, but the initial investment in the robot is too large and is not suitable for small workshops; therefore, the above three demoulding components are not preferred solutions of the present invention.

[0013] Preferably, the demoulding assembly comprises a return block and a return spring, a plurality of the fingers are coaxially provided with demoulding holes, a plurality of the demoulding rods are respectively slidably connected to the plurality of demoulding holes, the plurality of the demoulding holes are connected inside the palm and extend toward the mounting frame, the lower end face of the return block is connected to one end of the plurality of demoulding rods close to the mounting frame, the return spring is sleeved on the return block, and the upper and lower ends of the return spring are respectively connected to the return block and the lower end of the wrist, thereby avoiding the generation of additional pressure between the glove and the hand mold, resulting in the need to apply a greater pulling force when the demoulding mechanism demoulds the glove, and the clamping method and the like are likely to cause damage to the contact surface of the glove, thereby resulting in the problem of reduced quality of the finished glove, thereby ensuring the demoulding efficiency of the demoulding structure of the injection mold for forming rubber products and ensuring the quality of the finished glove.

[0014] Preferably, an expansion section is provided between the fingertips and the fingers, a plurality of expansion blocks are evenly distributed on the circumference of the expansion section, a plurality of the expansion blocks are hinged on the fingers at one end close to the palm, expansion coil springs are installed at the hinges between the plurality of the expansion blocks and the fingers, a trigger platform is provided on the demolding rod, a trigger ring is coaxially sleeved on the demolding rod, the trigger ring is located on the inner side of the plurality of expansion blocks, the longitudinal cross-section of the trigger ring is trapezoidal, and the upper end of the trapezoid is the large end, and a plurality of the expansion blocks are slidably connected to the trigger ring at one end close to the demolding rod, thereby avoiding the problem of demolding failure caused by the fingertips pulling the gloves back when the fingertips are retracted after ejection, thereby ensuring the demolding efficiency of the demolding structure of the injection mold for molding rubber products.

[0015] Preferably, a sealing groove is coaxially provided on one end of the expansion section close to the fingertip, and a sealing platform is coaxially provided on one end of the fingertip close to the expansion section, the circumferential cross-section of the sealing platform is triangular, and the sealing platform is embedded in the sealing groove when the fingertip is in contact with the finger, thereby avoiding the problem of gaps between the fingertips and the fingertips after the fingertips are retracted, resulting in rubber overflowing into the inside of the finger during hand mold injection molding, and ensuring the sealing between the fingertips and the finger in the demolding structure of the injection mold for molding rubber products.

[0016] Preferably, the transverse cross-section of the expansion block is trapezoidal, and the large end is located on the outside of the finger, thereby avoiding the problem of a gap between the expansion block and the fingertips after the expansion block returns to its original position, causing rubber to overflow into the inside of the finger during hand mold injection molding, thereby ensuring the sealing between the fingertips and the fingers in the demolding structure of the injection mold for forming rubber products. At the same time, when the sealing platform is embedded in the sealing groove, the trapezoidal side of the expansion block improves the fit between the expansion block and the finger.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a demolding assembly and a demolding assembly in a shell. When the piston rod is pressed to push the pre-demolding rod to move toward the fingertips, the demolding plate moves toward the fingertips along the surface of the hand mold. After the demolding plate is completely embedded in the glove and pushes the glove to move toward the finger to a specified position, the pre-demolding rod simultaneously pushes multiple demolding rods to push the fingertips outward, thereby avoiding the problem that only the fingertips of the gloves are subjected to a downward pulling force, resulting in uneven force on the gloves and irreversible deformation, which in turn leads to a decrease in the quality of the finished gloves. The stability of the demolding structure of the injection mold for forming rubber products is ensured, and the quality of the finished gloves is ensured.

[0019] 2. The present invention provides an adaptable section on one end of the demolding plate close to the wrist, wherein an adaptable spring is installed inside the adaptable section, and the adaptable section is made of wear-resistant flexible material, thereby avoiding the problem that when the demolding plate demolds the gloves, the gloves are pierced by the front end of the demolding plate due to the tilting of the front end of the demolding plate, thereby reducing the quality of the finished gloves, thereby ensuring the safety of the demolding structure of the injection mold for forming rubber products and the quality of the finished gloves.

[0020] 3. The present invention provides an expansion section between the fingertips and the fingers, and a plurality of expansion blocks are evenly distributed on the circumference of the expansion section. The ends of the plurality of expansion blocks close to the palm are hinged on the fingers, and expansion coil springs are installed at the hinges of the plurality of expansion blocks and the fingers. The demolding rod is provided with a trigger platform, and the coaxial sleeve on the demolding rod is provided with a trigger ring, which is located on the inner side of the plurality of expansion blocks. The longitudinal cross-section of the trigger ring is trapezoidal, and the upper end of the trapezoid is the large end. The ends of the plurality of expansion blocks close to the demolding rod are slidably connected with the trigger ring, thereby avoiding the problem of demolding failure caused by the fingertips pulling the gloves back when the fingertips are retracted after ejection, thereby ensuring the demolding efficiency of the demolding structure of the injection mold for forming rubber products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the demoulding structure of the injection mold for forming rubber products of the present invention;

[0022] Figure 2 It is a schematic diagram of the installation of the demoulding structure of the injection mold for forming rubber products of the present invention when demoulding;

[0023] Figure 3 For the present invention Figure 1 Sectional view at AA in the middle;

[0024] Figure 4 For the present invention Figure 2 Sectional view at the middle BB;

[0025] Figure 5 For the present invention Figure 3 Sectional view at C in the middle;

[0026] Figure 6 It is a schematic diagram of the installation of fingertip demoulding in the demoulding structure of the injection mold for forming rubber products of the present invention;

[0027] Figure 7 For the present invention Figure 6 Sectional view at DD in the middle;

[0028] Figure 8 The present invention is a schematic diagram of the installation of the expansion block in the demoulding structure of the injection mold for forming rubber products when the expansion block is retracted.

[0029] In the figure: 1, hand mold; 2, glove; 3, mounting frame; 401, wrist; 402, palm; 403, finger; 404, fingertip; 405, cylinder; 406, piston rod; 501, pre-stripping rod; 502, demoulding plate; 503, rubber push plate; 504, demoulding frame; 505, return coil spring; 506, adaptation section; 507, adaptation spring leaf; 508, demoulding spring; 601, demoulding rod; 602, demoulding hole; 603, return spring; 604, return block; 701, expansion section; 702, expansion block; 703, expansion coil spring; 704, trigger table; 705, trigger ring; 706, sealing groove; 707, sealing table. DETAILED DESCRIPTION

[0030] See also Figures 1 to 8 The present invention provides a demoulding structure for a rubber product molding injection mold, and the technical solution is as follows:

[0031] A demoulding structure for a rubber product molding injection mold comprises a hand mold 1 and a mounting frame 3. The hand mold 1 is mounted on the lower end surface of the mounting frame 3. A glove 2 is sleeved on the hand mold 1. The hand mold 1 comprises a wrist 401, a palm 402, a finger 403 and a fingertip 404. The hand mold 1 is mounted with the fingertip 404 facing downward, and the fingertip 404 is connected to the finger 403. A cylinder 405 and a piston rod 406 are mounted on the mounting frame 3. A demoulding assembly and a demoulding assembly are arranged in the hand mold 1. A pre-demolding rod 501 and a demoulding plate 502 are arranged on the demoulding assembly. The pre-stripping rod 501 is connected to the piston rod 406, the stripping plate 502 is connected to the pre-stripping rod 501, and the stripping plate 502 is slidably connected to the outer surface of the hand mold 1. A plurality of stripping rods 601 are provided on the demoulding assembly, and the plurality of stripping rods 601 are respectively slidably connected to the plurality of fingers 403. The stripping rods 601 are made of steel wire and can be bent at a small angle. The lower end surfaces of the plurality of stripping rods 601 are respectively connected to the plurality of fingertips 404. When the piston rod 406 is pressed to push the pre-stripping rod 501 to move toward the fingertips 404, the demoulding The plate 502 moves along the surface of the hand mold 1 toward the fingertips 404. At this time, the glove 2 at the wrist 401 is pushed toward the finger 403 to avoid the glove 2 at the wrist 401 being pulled on the wrist 401 when the finger 403 is ejected in the next step, resulting in uneven force on the glove 2 and irreversible deformation. After the demolding plate 502 is completely embedded in the glove 2 and pushes the glove 2 to move to the finger 403 to a specified position, the pre-stripping rod 501 simultaneously pushes the multiple demolding rods 601 to eject the fingertips 404 outward. After the glove 01 and the fingertip 404 are ejected, the glove 2 is clamped and stacked by the robot. When the robot clamps the glove 2, the fingertip 404 has been separated from the finger 403, and the glove 2 and the finger 403 will not contact each other at this time, thereby avoiding the problem in the prior art that only the fingertip 404 of the glove 2 is subjected to the pulling force on the demoulding device, resulting in the uneven force on the glove 2 and irreversible deformation, thereby causing the quality of the finished glove 2 to decrease, thereby ensuring the stability of the demoulding structure of the injection mold for forming rubber products and the quality of the finished glove 2.

[0032] See also Figure 1 , Figure 2 and Figure 4The demoulding assembly includes a rubber pushing plate 503, a demoulding frame 504, a demoulding spring 508 and a return coil spring 505. The rubber pushing plate 503 is installed on one end of the demoulding plate 502 close to the mounting frame 3. The demoulding frame 504 is slidably connected to the pre-stripping rod 501. The demoulding spring 508 is sleeved on the pre-stripping rod 501, and the upper and lower ends of the demoulding spring 508 are respectively connected to the mounting frame 3 and the demoulding frame 504. The end of the demoulding plate 502 close to the mounting frame 3 is hinged on the demoulding frame 504. The return coil spring 505 is installed at the hinge between the demoulding plate 502 and the demoulding frame 504. The piston rod 406 pushes the pre-stripping rod 501 to release the pressure of the demoulding spring 508 to demould the glove 2 at the wrist 401. After the rolled gloves are collected by the demoulding frame 504, 2, and pushes it toward the fingertips 404. After the demolding plate 502 pushes the glove 2 at the wrist 401 to the palm 402, the demolding assembly completes the demolding work. The demolding plate 502 pushes the glove 2 from the wrist 401 to the palm 402 through the pre-stripping rod 501, avoiding the situation that when the fingertips 404 of the glove 2 are subjected to a downward pulling force, since the size of the wrist 401 is smaller than that of the palm 402, a reaction force will be generated at the wrist 401 at this time. When the fingertips 404 are subjected to a downward pulling force, it is easy to cause the glove 2 to be subjected to uneven force and cause irreversible deformation, thereby causing the quality of the finished glove 2 to decline, thereby ensuring the stability of the demolding structure of the injection mold for forming rubber products and the quality of the finished glove 2.

[0033] It is worth noting that the stripping plate 502 is in the shape of a right triangle, and the end close to the fingertip 404 is an acute angle, the right-angled side of the stripping plate 502 is close to the outer surface of the hand mold 1, and the hinge between the stripping plate 502 and the stripping frame 504 is located at the end of the stripping plate 502 close to the mounting frame 3 and away from the hand mold 1. The glove 2 is supported by the stripping plate 502, so that the contact area between the glove 2 and the hand mold 1 is reduced, thereby avoiding the problem that when the stripping plate 502 strips the glove 2, the contact surface between the glove 2 and the hand mold 1 is too large, resulting in increased friction, thereby causing the glove 2 to be subjected to uneven force and irreversible deformation, further leading to a decrease in the quality of the finished glove 2, thereby ensuring that the demolding structure of the rubber product molding injection mold reduces the reverse force when stripping, and ensuring the quality of the finished glove 2.

[0034] It is also worth noting that an adaptable section 506 is provided on one end of the lifting plate 502 close to the wrist 401, and an adaptable spring 507 is installed inside the adaptable section 506. The adaptable section 506 is made of wear-resistant flexible material. The adaptable section 506 is embedded in the glove 2 and is always in close contact with the surface of the hand mold 1 through its own flexibility, thereby avoiding the problem that when the adaptable section 506 is pushed toward the fingertip 404, the front end of the lifting plate 502 is tilted due to the fluctuation between the wrist 401 and the palm 402 of the hand mold 1, and then the glove 2 is pierced by the front end of the lifting plate 502, and then the quality of the finished glove 2 is reduced, thereby ensuring the safety of the demolding structure of the injection mold for forming rubber products and the quality of the finished glove 2.

[0035] See also Figure 1 , Figure 3 and Figures 5 to 8 The demoulding assembly includes a return block 604 and a return spring 603. The plurality of fingers 403 are coaxially provided with demoulding holes 602. The plurality of demoulding rods 601 are respectively slidably connected in the plurality of demoulding holes 602. The plurality of demoulding holes 602 are connected inside the palm 402 and extend toward the mounting frame 3. The lower end surface of the return block 604 is connected to one end of the plurality of demoulding rods 601 close to the mounting frame 3. The return spring 603 is sleeved on the return block 604, and the upper and lower ends of the return spring 603 are respectively connected to the return block 60 4 is connected to the lower end of the wrist 401, and multiple demoulding rods 601 are pushed out toward the fingertips 404 at the same time. At this time, the fingertips 404 of the glove 2 are stressed at the same time, which avoids the generation of additional pressure between the glove 2 and the hand mold 1, resulting in the demoulding mechanism needing to apply a greater pulling force when demoulding the glove 2, and the clamping method and the like are likely to cause damage to the contact surface of the glove 2, thereby causing the quality of the finished glove 2 to decrease, thereby ensuring the demoulding efficiency of the demoulding structure of the rubber product molding injection mold and the finished product quality of the glove 2.

[0036] It is worth noting that an expansion section 701 is provided between the fingertip 404 and the finger 403, and a plurality of expansion blocks 702 are evenly distributed on the circumference of the expansion section 701. The ends of the plurality of expansion blocks 702 close to the palm 402 are hinged on the finger 403, and expansion coil springs 703 are installed at the hinges of the plurality of expansion blocks 702 and the finger 403. A trigger platform 704 is provided on the demoulding rod 601, and a trigger ring 705 is coaxially sleeved on the demoulding rod 601. The trigger ring 705 is located on the inner side of the plurality of expansion blocks 702, and the longitudinal section of the trigger ring 705 is trapezoidal, and the trapezoidal The upper end is the large end, and one end of the plurality of expansion blocks 702 close to the demolding rod 601 is slidably connected to the trigger ring 705. When the demolding rod 601 moves downward to a specified position, the trigger platform 704 pushes the trigger ring 705, so that the large end of the trigger ring 705 moves downward. At this time, the expansion block 702 is pushed by the trigger ring 705 to swing outward along the hinge point to the outside of the finger 403, thereby avoiding the problem of demolding failure caused by the fingertip 404 pulling the glove 2 back when the fingertip 404 is retracted after ejection, thereby ensuring the demolding efficiency of the demolding structure of the injection mold for forming rubber products.

[0037] It is also worth noting that a sealing groove 706 is coaxially provided on one end of the expansion section 701 close to the fingertip 404, and a sealing platform 707 is coaxially provided on one end of the fingertip 404 close to the expansion section 701. The circumferential cross-section of the sealing platform 707 is triangular. When the fingertip 404 and the finger 403 are in contact, the sealing platform 707 is embedded in the sealing groove 706. Since the circumferential cross-section of the sealing platform 707 is triangular, during the process of the sealing platform 707 being embedded in the sealing groove 706, the sealing platform 707 locks the expansion block 702 through the triangular inclined surface, thereby avoiding the problem that after the fingertip 404 is retracted, a gap is left between the fingertip 404 and the finger 403, resulting in the overflow of rubber into the inside of the finger 403 during the injection molding of the hand mold 1, thereby ensuring the sealing between the fingertip 404 and the finger 403 in the demolding structure of the injection mold for molding rubber products.

[0038] The transverse cross-section of the expansion block 702 is trapezoidal, and the large end is located on the outside of the finger 403. When the sealing platform 707 is embedded in the sealing groove 706, the end of the expansion block 702 close to the fingertip 404 is subjected to force, so that the expansion block 702 moves toward the center of the expansion section 701, thereby avoiding the problem that after the expansion block 702 returns to its original position, a gap is generated between the expansion block 702 and the fingertip 404 of the finger 403, resulting in the overflow of rubber into the inside of the finger 403 during the injection molding of the hand mold 1, thereby ensuring the sealing between the fingertip 404 and the finger 403 in the demolding structure of the injection mold for forming the rubber product. At the same time, when the sealing platform 707 is embedded in the sealing groove 706, the expansion block 702 has a trapezoidal side, so that the fit between the expansion block 702 and the finger 403 is improved.

[0039] While working, see Figures 1 to 8When the piston rod 406 is pressed to push the pre-stripping rod 501 to move toward the fingertip 404, the piston rod 406 pushes the pre-stripping rod 501 to release the pressure of the demolding spring 508 to demold the glove 2 at the wrist 401, and the rolled glove 2 is collected by the demolding frame 504 and pushed toward the fingertip 404. After the demolding plate 502 pushes the glove 2 at the wrist 401 to the palm 402, the demolding assembly completes the demolding work. It is worth noting that when the adapting section 506 is pushed toward the fingertip 404, the adapting spring 507 bends toward the hand mold 1 to avoid the problem that the front end of the demolding plate 502 is tilted due to the fluctuation between the wrist 401 and the palm 402 of the hand mold 1, and then the glove 2 is pierced by the front end of the demolding plate 502.

[0040] Furthermore, after the demoulding plate 502 is completely embedded in the glove 2 and pushes the glove 2 to move toward the finger 403 to a specified position, the pre-stripping rod 501 continues to move toward the fingertip 404. When the lower end of the pre-stripping rod 501 contacts the return block 604, the return block 604 is pressed and moves toward the fingertip 404. At this time, the return spring 603 is compressed and shrinks to prepare for the return stroke. After the return block 604 is compressed, it simultaneously pushes multiple demoulding rods 601 to push the fingertip 404 downward. When the fingertip 404 moves downward to a specified position, the lower end of the trigger platform 704 contacts the upper end of the trigger ring 705 and pushes the trigger ring 705 to move downward. At this time, the trigger ring 705 pushes the multiple expansion blocks 702 outward from the fingers 403. At this time, the diameter of the glove 2 between the expansion section 701 and the fingertip 404 will increase as the expansion block 702 expands. At the same time, when the demoulding rod 601 drives the fingertip 404 to move downward, the glove 2 on the palm 402 will also be pulled by the demoulding rod 601 and move toward the fingertip 404, until the glove 2 on the palm 402 moves to the finger 403, and the demoulding rod 601 stops moving. At this time, the glove 2 has been separated from the palm 402 position at the largest end of the hand mold 1, and the glove 2 can be easily removed by being clamped by the robot.

[0041] It is worth noting that during the return stroke of the fingertip 404, the cylinder 405 drives the piston rod 406 and the pre-release rod 501 to retract, and after the return spring 603 loses the pressure of the pre-release rod 501, it pushes the return block 604 toward the mounting bracket 3 through its own compression elastic force. At this time, the return block 604 will drag multiple demoulding rods 601 to move together. At this time, the fingertips 404 on the multiple demoulding rods 601 will move with the demoulding rods 601 until the sealing platform 707 is embedded in the sealing groove 706, thereby avoiding the problem that after the fingertip 404 is retracted, there is a gap between the fingertip 404 and the fingertip 403, resulting in the overflow of rubber into the inside of the finger 403 during the injection molding of the hand mold 1, thereby ensuring the sealing between the fingertip 404 and the finger 403 in the demoulding structure of the injection mold for molding rubber products.

[0042] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A demoulding structure for a rubber product molding injection mold, characterized in that: The invention comprises a hand model (1) and a mounting frame (3), wherein the hand model (1) is mounted on the lower end surface of the mounting frame (3), a glove (2) is sleeved on the hand model (1), the hand model (1) comprises a wrist (401), a palm (402), fingers (403) and fingertips (404), the hand model (1) is mounted with the fingertips (404) facing downward, the fingertips (404) are connected to the fingers (403), a cylinder (405) and a piston rod (406) are mounted on the mounting frame (3), a demoulding component and a demoulding component are arranged in the hand model (1), a pre-demolding rod (501) and a demoulding plate (502) are arranged on the demoulding component, the pre-demolding rod (501) is connected to the piston rod (406), the demoulding plate (502) is connected to the pre-demolding rod (501), and the demoulding plate (502) is slidably connected to the hand model. (1) On the outer surface, the demoulding assembly is provided with a plurality of demoulding rods (601), the plurality of demoulding rods (601) are respectively slidably connected in a plurality of fingers (403), the lower end surfaces of the plurality of demoulding rods (601) are respectively connected to a plurality of fingertips (404), the piston rod (406) is slidably connected in the cylinder (405), when the cylinder (405) drives the piston rod (406), the piston rod (406) pushes the pre-demolding rod (501) to move in the direction of the fingertips (404), the demoulding assembly pushes the glove (2) on the wrist in the direction of the fingertips (404) through the demoulding plate (502), after the demoulding plate (502) moves to a specified position, the demoulding assembly drives the plurality of demoulding rods (601) simultaneously through the pre-demolding rod (501) to push the fingertips (404) outward.

2. A demoulding structure of a rubber product molding injection mold according to claim 1, characterized in that: The die-pulling assembly comprises a rubber pushing plate (503), a die-pulling frame (504), a die-pulling spring (508) and a return coil spring (505); the rubber pushing plate (503) is mounted on one end of the die-pulling plate (502) close to the mounting frame (3); the die-pulling frame (504) is slidably connected to the pre-stripping rod (501); the die-pulling spring (508) is sleeved on the pre-stripping rod (501); and the upper and lower ends of the die-pulling spring (508) are respectively connected to the mounting frame (3) and the die-pulling frame (504); one end of the die-pulling plate (502) close to the mounting frame (3) is hinged to the die-pulling frame (504); and the return coil spring (505) is mounted at the hinge between the die-pulling plate (502) and the die-pulling frame (504).

3. A demoulding structure of a rubber product molding injection mold according to claim 2, characterized in that: The lifting plate (502) is in the shape of a right triangle, and the end close to the fingertip (404) is an acute angle. The right-angled side of the lifting plate (502) is in close contact with the outer surface of the hand mold (1). The hinge between the lifting plate (502) and the lifting frame (504) is located at one end of the lifting plate (502) close to the mounting frame (3) and away from the hand mold (1).

4. A demoulding structure of a rubber product molding injection mold according to claim 3, characterized in that: An adaptable section (506) is provided on one end of the lifting plate (502) close to the wrist (401), an adaptable spring sheet (507) is installed inside the adaptable section (506), and the adaptable section (506) is made of wear-resistant flexible material.

5. A demoulding structure of a rubber product molding injection mold according to claim 2, characterized in that: The demoulding assembly comprises a return block (604) and a return spring (603); a plurality of the fingers (403) are coaxially provided with demoulding holes (602); a plurality of the demoulding rods (601) are respectively slidably connected in the plurality of demoulding holes (602); the plurality of the demoulding rods (601) are all made of steel wire and can be bent at a small angle; the plurality of the demoulding holes (602) are connected inside the palm (402) and extend toward the mounting frame (3); the lower end surface of the return block (604) is connected to one end of the plurality of demoulding rods (601) close to the mounting frame (3); the return spring (603) is sleeved on the return block (604), and the upper and lower ends of the return spring (603) are respectively connected to the return block (604) and the lower end of the wrist (401).

6. A demoulding structure of a rubber product molding injection mold according to claim 5, characterized in that: An expansion section (701) is provided between the fingertip (404) and the finger (403), and a plurality of expansion blocks (702) are evenly distributed on the circumference of the expansion section (701). One end of the plurality of expansion blocks (702) close to the palm (402) is hinged on the finger (403), and expansion coil springs (703) are installed at the hinges between the plurality of expansion blocks (702) and the finger (403). A trigger platform is installed on the demoulding rod (601). (704), a trigger ring (705) is slidably sleeved on the demoulding rod (601), and the trigger ring (705) is located on the inner side of the plurality of expansion blocks (702). The longitudinal cross-section of the trigger ring (705) is trapezoidal, and the upper end of the trapezoid is the large end. One end of the plurality of expansion blocks (702) close to the demoulding rod (601) is slidably connected to the trigger ring (705), and the trigger platform (704) is located on the upper side of the trigger ring (705).

7. A demoulding structure of a rubber product molding injection mold according to claim 6, characterized in that: A sealing groove (706) is coaxially provided on one end of the expansion section (701) close to the fingertip (404), and a sealing platform (707) is coaxially provided on one end of the fingertip (404) close to the expansion section (701). The circumferential cross-section of the sealing platform (707) is triangular, and the sealing platform (707) is embedded in the sealing groove (706) when the fingertip (404) and the finger (403) are in contact.

8. A demoulding structure of a rubber product molding injection mold according to claim 7, characterized in that: The transverse cross-section of the expansion block (702) is trapezoidal, and the larger end is located outside the finger (403).

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