A plastic mold that is easy to demould

Abstract

The present invention discloses a plastic mold which is convenient for demoulding production, belongs to the technical field of injection mold devices, comprises an upper mold base and a lower mold base matched with the upper mold base, a demoulding plate is arranged between the upper mold base and the lower mold base, and a convex mold is arranged on the lower mold base; by arranging an L-shaped demoulding plate, during the process of rotating the demoulding plate, on the one hand, the product formed on the demoulding plate can be rotated to the side of the lower mold base, so as to facilitate the molded product to fall off from the demoulding plate. Compared with the traditional method of directly ejecting the product, during the demoulding process in this scheme, the product is subjected to more uniform force, which is conducive to avoiding deformation of the product when being ejected, thereby improving the quality of the product. On the other hand, when the molded product is rotated to one side of the lower mold base, the other side of the demoulding plate is attached to the lower mold base, which is conducive to the next operation and makes the overall injection molding operation more coherent.

Description

Technical Field

[0001] The invention relates to the technical field of injection mold devices, and in particular to a plastic mold that is easy to demould. Background Art

[0002] A mold is a tool used to make molded objects. A mold is a variety of molds and tools that are used to obtain the desired products through methods such as injection molding, blow molding, extrusion, and die casting. Different molds are composed of different parts. The shape of the object is processed mainly by changing the physical state of the molded material. The mold has a spatial cavity mold inside. The mold is generally produced in single pieces and small batches. When producing plastic products, a plastic mold production mechanism will be used.

[0003] Chinese patent CN220429002U discloses a plastic mold production mechanism that is easy to demold. A push rod is provided. When demolding, the electric push rod is started, and the electric push rod drives the connecting plate to move up. The connecting plate will squeeze the spring upward, and the connecting plate will drive the push rod to move up. The push rod will push the mold out, and then the demolding work of the mold can be completed. After demolding, the push rod will reset to the inside of the reserved hole again, which improves the convenience during production.

[0004] The above-mentioned device is demoulded by means of a push rod, but in actual use, this method increases the possibility of product deformation due to pressure on the one hand, and on the other hand, when the equipment is placed vertically as a whole, the staff still needs to take out the molded product after the push rod pushes it out, which makes the overall use of the device inconvenient. In summary, there is still room for improvement in the above-mentioned device.

[0005] Therefore, it is necessary to provide a plastic mold that is easy to demould to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a plastic mold that is easy to demold in production, so as to solve the problem that the existing device proposed in the above background technology performs demolding by setting a push rod, but in actual use, on the one hand, this method increases the possibility of product compression and deformation, and on the other hand, when the equipment is placed vertically as a whole, the push rod pushes out the molded product and still requires staff to take it out.

[0007] Based on the above ideas, the present invention provides the following technical solutions: a plastic mold that is convenient for demoulding production, comprising an upper mold base and a lower mold base matched with the upper mold base, a stripping plate is arranged between the upper mold base and the lower mold base, a punch is arranged on the lower mold base, a through groove matched with the punch is opened on the stripping plate, a first hydraulic rod is arranged below the lower mold base, and a telescopic end of the first hydraulic rod passes through the lower mold base and contacts with the stripping plate;

[0008] The stripping plate is configured to be L-shaped, and bosses are fixedly provided at both ends of the stripping plate, the bosses are located on both side surfaces of the stripping plate, vertical plates are provided on both sides of the lower die base, and two support rods are provided between the two vertical plates, the two support rods respectively cooperate with the bosses on the stripping plate, and are used to pull the stripping plate to deflect it, so that the horizontal and vertical parts of the stripping plate can be alternately placed on the lower die base.

[0009] As a further solution of the present invention: the support rod is configured as a U-shaped structure as a whole, and two connecting plates are fixedly provided at the vertical part of the support rod. The two connecting plates are located on both sides of the support rod, and the connecting plates and the vertical plates are matched with each other through a guide assembly. When the support rod pulls one end of the stripping plate to move downward, the guide assembly can drive the support rod to move in a direction away from the lower mold base.

[0010] As a further solution of the present invention: the guide assembly includes a guide block fixedly connected to the connecting plate, and a plurality of guide grooves matching the guide blocks are provided on the side of the vertical plate close to the connecting plate, and the guide grooves are provided with an outer convex portion and an inner concave portion. When the guide block slides along the guide groove and enters the outer convex portion, the connecting plate can move in a direction away from the lower mold base, and when the guide block slides from the guide groove to the inner concave portion, the connecting plate can move in a direction close to the lower mold base.

[0011] As a further solution of the present invention: a positioning plate is fixedly provided at the top position of the support rod, and the positioning plate is located on the side of the support rod away from the lower mold base. When the support rod pulls one end of the stripping plate to flip it 90°, the originally horizontal part of the stripping plate is rotated to a vertical state and is limited between the lower mold base and the positioning plate.

[0012] As a further solution of the present invention: a limiting axis is elastically provided on one side of the boss close to the support rod, a limiting hole matching the limiting axis is provided on the support rod, a top block is provided in the limiting hole, the top block passes through the support rod and is elastically connected to the support rod, a magnet is fixedly provided on one end of the top block passing through the support rod, a strip groove is provided on the vertical plate along its height direction, the magnet slides in the strip groove, a magnetic plate matching the magnet is fixedly embedded on the inner wall of the strip groove, and the magnet has the same magnetic pole on the side opposite to the magnetic plate.

[0013] As a further solution of the present invention: a pressing frame is provided on the sliding sleeve at the transverse part of the support rod.

[0014] As a further solution of the present invention: a second hydraulic rod is arranged below the pressing frame, and a telescopic end of the second hydraulic rod is fixedly connected to the pressing frame.

[0015] As a further solution of the present invention: the lower mold base and the vertical plate are fixedly connected by a fixing strip.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting an L-shaped stripping plate, during the process of rotating the stripping plate, on the one hand, the product formed on the stripping plate can be rotated to the side of the lower mold base, thereby facilitating the molded product to fall off the stripping plate. Compared with the traditional method of directly ejecting the product, during the demolding process in this scheme, the product is subjected to more uniform force, which is conducive to avoiding deformation of the product when being ejected, thereby improving the quality of the product. On the other hand, when the molded product is rotated to one side of the lower mold base, the other side of the stripping plate is attached to the lower mold base, which is conducive to the next operation and makes the overall injection molding operation more coherent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 3 It is a schematic diagram of the connection structure between the boss and the support rod of the present invention;

[0021] Figure 4 It is a schematic diagram of the cooperation between the limit shaft and the support rod of the present invention;

[0022] Figure 5 The present invention Figure 4 A schematic diagram of the enlarged structure at point A;

[0023] Figure 6 It is a schematic structural diagram of a stripping plate of the present invention;

[0024] Figure 7 It is a schematic diagram of the stripping plate of the present invention in an initial state;

[0025] Figure 8 It is a schematic diagram of the stripping plate of the present invention being lifted up and staggered with the male die;

[0026] Fig. 9 It is a schematic diagram of the stripping plate of the present invention when it is deflected with the telescopic end of the first hydraulic rod as a fulcrum;

[0027] Fig.10 It is a schematic diagram of the stripping plate of the present invention after being rotated 90°.

[0028] In the figure: 1. upper die seat; 2. stripper plate; 201. boss; 202. through groove; 3. positioning plate; 4. lower die seat; 401. punch; 5. connecting plate; 6. support rod; 7. pressure frame; 8. fixing strip; 9. vertical plate; 901. guide groove; 9011. outer convex part; 9012. inner concave part; 902. strip groove; 10. first hydraulic rod; 11. top block; 12. magnet; 13. guide block; 14. magnetic plate; 15. limit axis. DETAILED DESCRIPTION

[0029] like Figure 1-3 As shown, a plastic mold for easy demoulding production includes an upper mold base 1 and a lower mold base 4 matched with the upper mold base 1, and a demoulding plate 2 is arranged between the upper mold base 1 and the lower mold base 4. Specifically, a punch 401 is arranged on the lower mold base 4, and a mold cavity matched with the punch 401 is opened on the upper mold base 1. Of course, a guide tube needs to be installed on the upper mold base 1 to facilitate the injection of raw materials into the space formed by the punch 401 and the mold cavity;

[0030] In order to remove the formed product, a stripper plate 2 is provided between the upper die base 1 and the lower die base 4. Figure 1-2 As shown, the stripping plate 2 is provided with a through groove 202 which cooperates with the punch 401, so that the stripping plate 2 can be placed on the lower die base 4. In addition, a first hydraulic rod 10 is arranged below the lower die base 4, and the telescopic end of the first hydraulic rod 10 passes through the lower die base 4 and contacts with the stripping plate 2, and the telescopic end of the first hydraulic rod 10 can slide relative to the lower die base 4. In actual use, the upper die base 1 is pressed against the stripping plate 2. After the injection molding is completed, the stripping plate 2 can be lifted upward by the first hydraulic rod 10, so that the molded product is staggered with the punch 401, which is beneficial for demolding the product.

[0031] Furthermore, the above-mentioned stripping plate 2 is configured to be L-shaped, and bosses 201 are fixedly provided at both ends of the stripping plate 2, and the bosses 201 are located on both side surfaces of the stripping plate 2. Vertical plates 9 are provided on both sides of the lower mold base 4, and the vertical plates 9 can be fixed on the ground. Two support rods 6 are provided between the two vertical plates 9. The two support rods 6 are respectively matched with the two ends of the stripping plate 2 to pull the stripping plate 2 to deflect it. Through this structure, the horizontal and vertical parts of the stripping plate 2 can be alternately placed on the lower mold base 4, so that the overall demolding is more stable and continuous.

[0032] The support rod 6 is configured as a U-shaped structure as a whole, and two connecting plates 5 are fixedly provided at the vertical part of the support rod 6. The two connecting plates 5 are located on both sides of the support rod 6, and the connecting plates 5 are matched with the vertical plates 9 through a guide component. When the support rod 6 pulls one end of the stripping plate 2 to move downward, the guide component can drive the support rod 6 to move in a direction away from the lower die base 4. Through this structure, the support rod 6 is conducive to pulling the stripping plate 2 and deflecting it more labor-savingly and stably.

[0033] like Figure 2-6 As shown, the guide assembly includes a guide block 13 fixedly connected to the connecting plate 5, and the guide block 13 is located on a side of the connecting plate 5 close to the vertical plate 9. Figure 7 As shown, the guide blocks 13 on the same connecting plate 5 are provided with multiple groups and distributed at the four corners of the connecting plate 5. The number of each group of guide blocks 13 is at least one. In this scheme, the number of each group of guide blocks 13 is preferably set to two. The side of the vertical plate 9 close to the connecting plate 5 is provided with multiple groups of guide grooves 901 that match the guide blocks 13. The guide grooves 901 can be regarded as wavy as a whole. For details, refer to Figure 7 The guide groove 901 has an outer protrusion 9011 protruding in the direction away from the lower die base 4 and an inner recess 9012 recessed in the direction close to the lower die base 4. Through this structure, when the guide block 13 slides along the guide groove 901 and enters the outer protrusion 9011, the connecting plate 5 can be offset in the direction away from the lower die base 4. Similarly, when the guide block 13 slides from the guide groove 901 to the inner recess 9012, the connecting plate 5 can be deflected in the direction close to the lower die base 4.

[0034] In order to position the deflected stripping plate 2, a positioning plate 3 is fixedly provided at the top position of the support rod 6 in this solution. The positioning plate 3 is located on the side of the support rod 6 away from the lower die seat 4. Fig.10 As shown, when the support rod 6 pulls one end of the stripper plate 2 to flip it 90°, the originally horizontal part of the stripper plate 2 is rotated to a vertical state and is limited between the lower mold base 4 and the positioning plate 3, so as to maintain the stability of the stripper plate 2 and enable the product thereon to fall stably.

[0035] In order for the support rod 6 to pull the stripper plate 2, a limiting shaft 15 is elastically arranged on one side of the boss 201 close to the support rod 6, and a limiting hole matching the limiting shaft 15 is provided on the support rod 6. When one end of the limiting shaft 15 is inserted into the limiting hole, the support rod 6 can pull the stripper plate 2 and deflect it during the vertical movement.

[0036] Furthermore, when the support rod 6 on one side pulls one end of the stripping plate 2 to deflect it, the other end of the stripping plate 2 needs to disengage from the support rod 6 on the other side. Therefore, in this scheme, a top block 11 is arranged in the limiting hole, and the top block 11 passes through the support rod 6 and is elastically connected to it. A magnet 12 is fixedly arranged at one end of the top block 11 passing through the support rod 6, and a strip groove 902 is opened on the vertical plate 9 along its height direction. The strip groove 902 is arranged opposite to the magnet 12, so that the magnet 12 slides in the strip groove 902, and a magnetic plate 14 that cooperates with the magnet 12 is fixedly embedded on the side of the inner cavity of the strip groove 902 away from the lower mold base 4, and the magnet 12 has the same magnetic pole on the side opposite to the magnetic plate 14, and the magnetic plate 14 is located at a position close to the bottom end of the vertical plate 9.

[0037] In the initial state, the stripping plate 2 is in Figure 7 In the state shown, the lateral part of the stripper plate 2 is fitted to the lower die base 4, and the convex die 401 on the lower die base 4 passes through the through groove 202 on the stripper plate 2. In this state, the limiting shaft 15 on the boss 201 is inserted into the limiting hole of the right support rod 6, so that the stripper plate 2 is connected to the right support rod 6. In addition, the guide blocks 13 on the connecting plate 5 are all in the guide groove 901 and can move in the vertical direction along the guide groove 901, which is conducive to the stable movement of the stripper plate 2 in the vertical direction. After that, the upper die base 1 is driven to move downward and pressed against the stripper plate 2 by an external power device such as a hydraulic cylinder. At this point, the stripper plate 2 is pressed between the upper die base 1 and the lower die base 4, which is conducive to the injection molding operation.

[0038] When demoulding is required, the upper mold base 1 is first driven to move upward and disengage from the demoulding plate 2. Then, the first hydraulic rod 10 is activated so that its telescopic end lifts the demoulding plate 2 upward. Figure 8 As shown, at this time, the through groove 202 on the stripper plate 2 is staggered with the punch 401, and then, the right support rod 6 is driven to move downward. Due to the limit of the telescopic end of the first hydraulic rod 10, the right support rod 6 moves downward and pulls the stripper plate 2, and the stripper plate 2 can be deflected. For details, refer to Fig. 9 As shown;

[0039] As the right support rod 6 continues to move downward, the guide block 13 on the right connecting plate 5 will slide to the outer protrusion 9011 on the guide groove 901, so that the connecting plate 5 and the support rod 6 move in the direction away from the lower die base 4. In this process, the pull rod can drag the stripping plate 2 to move to the right. Subsequently, when the support rod 6 moves downward along the guide groove 901, the stripping plate 2 will contact the side edge of the lower die base 4. Because the pull rod previously pulled the stripping plate 2 in the direction away from the lower die base 4 for a distance, when the stripping plate 2 contacts the side edge of the lower die base 4, the support rod 6 can also easily and stably drive the stripping plate 2 to deflect.

[0040] As the right support rod 6 continues to move downward, the guide block 13 on the right connecting plate 5 will enter the inner concave portion 9012 on the guide groove 901. During this process, the support rod 6 will gradually approach the lower die seat 4. When the guide block 13 passes over the inner concave portion 9012 and continues to slide downward along the guide groove 901, the stripping plate 2 is flipped 90° and is located between the positioning plate 3 and the lower die seat 4. For details, refer to Fig.10 As shown, at this time, the two side surfaces of the stripping plate 2 are in contact with the positioning plate 3 and the opposite side of the lower mold base 4 respectively, so that the stripping plate 2 can move downward stably. When the support rod 6 continues to drive the downward movement, the magnet 12 on the support rod 6 will be aligned with the magnetic plate 14 on the vertical plate 9, and the repulsive force between the two can push the top block 11, so that one end of the limiting shaft 15 is squeezed out from the limiting hole through the top block 11. At this point, the right support rod 6 is disconnected from the stripping plate 2. When the stripping plate 2 falls under the influence of gravity, it will fall on the lower mold base 4 and finally fit with the lower mold base 4 (in the process of the stripping plate 2 falling, since the stripping plate 2 is in contact with the lower mold base 4, the positioning plate 3 and the support rod 6, the stripping plate 2 can always remain stable when falling). In this process, the inertial force is conducive to the separation of the product from the stripping plate 2. At this point, the stripping plate 2 is rotated 90° to make the product on one side fall off, and the other side is attached to the lower mold base 4, which is conducive to the next injection molding;

[0041] Afterwards, the left support rod 6 can be moved upward to be connected with the stripping plate 2, thereby being helpful for preparing for the next demoulding.

[0042] In summary, this device sets an L-shaped stripping plate 2. During the process of rotating the stripping plate 2, on the one hand, it can rotate the product formed on the stripping plate 2 to the side of the lower mold base 4, which is conducive to the molded product falling off the stripping plate 2. Compared with the traditional method of directly ejecting the product, during the demolding process in this scheme, the product is subjected to more uniform force, which is conducive to avoiding deformation of the product when being ejected, thereby improving the quality of the product. On the other hand, when the molded product is rotated to one side of the lower mold base 4, the other side of the stripping plate 2 is attached to the lower mold base 4, which is conducive to the next operation, making the overall injection molding operation more coherent.

[0043] like Figure 1-2 As shown, in order to drive the support rod 6 to move up and down, a pressure frame 7 is slidably sleeved on the lateral part of the support rod 6, and at least one second hydraulic rod is fixedly installed on the ground below the pressure frame 7, and the telescopic end of the second hydraulic rod is fixedly connected to the pressure frame 7. Through this structure, it is helpful to drive the support rod 6 to move in the vertical direction.

[0044] The lower die base 4 and the vertical plate 9 are fixedly connected via a fixing strip 8 .

[0045] Reference Figure 4-5 As shown, a groove that slidably cooperates with the limit shaft 15 is opened on the boss 201, a spring is fixedly arranged between the inner end face of the groove and the limit shaft 15, and a mounting groove is opened on the inner wall of the limiting hole, and a slider that slidably cooperates with the mounting groove is fixedly arranged on the top block 11. In actual use, when the top block 11 is pushed by the repulsive force between the magnet 12 and the magnetic plate 14, the slider can slide along the mounting groove, and when the slider contacts the end face of the mounting groove, the top block 11 stops moving. At this time, the top block 11 moves to the extreme position, and the end face of the top block 11 is aligned with the side face of the support rod 6. In this state, the limit shaft 15 is just pushed out of the limiting hole, so that the support rod 6 is disconnected from the stripping template 2.

[0046] A first spring is fixedly disposed between the magnet 12 and the support rod 6 , and the first spring can be sleeved on the outside of the top block 11 .

[0047] like Figure 1-4 As shown, in actual use, for the quality of the injection molded product, the side of the punch 401 can contact the inner wall of the through groove 202, thereby preventing the injected material from flowing out from between the inner wall of the through groove 202 and the punch 401.

[0048] During specific use, lubricating oil can be applied between the limiting shaft 15 and the limiting hole to reduce the friction between the two. Of course, rubber pads can also be bonded to the side of the support rod 6 and the side surface of the positioning plate 3 close to the lower mold base 4, so that the stripping plate 2 can slowly descend after rotating 90°, thereby reducing the friction between the limiting shaft 15 and the inner wall of the limiting hole.

Claims

1. A plastic mold for easy demoulding production, comprising an upper mold base and a lower mold base matched with the upper mold base, a stripper plate is arranged between the upper mold base and the lower mold base, a convex mold is arranged on the lower mold base, and a through groove matched with the convex mold is opened on the stripper plate, characterized in that: A first hydraulic rod is arranged below the lower die seat, and a telescopic end of the first hydraulic rod passes through the lower die seat and contacts the stripping plate; The stripper plate is configured to be L-shaped, and bosses are fixedly provided at both ends of the stripper plate, the bosses are located on both side surfaces of the stripper plate, vertical plates are provided on both sides of the lower die seat, and two support rods are provided between the two vertical plates, and the two support rods are respectively matched with the bosses on the stripper plate, and are used to pull the stripper plate to deflect it, so that the horizontal and vertical parts of the stripper plate can be alternately placed on the lower die seat; The support rod is configured as a U-shaped structure as a whole, and two connecting plates are fixedly arranged at the vertical part of the support rod, and the two connecting plates are located at both sides of the support rod, and the connecting plates and the vertical plates are matched with each other through a guide assembly. When the support rod pulls one end of the stripping plate to move downward, the guide assembly can drive the support rod to move in a direction away from the lower die seat; The guide assembly includes a guide block fixedly connected to the connecting plate, and a plurality of guide grooves matched with the guide block are provided on the side of the vertical plate close to the connecting plate, and the guide groove is provided with an outer convex portion and an inner concave portion, and when the guide block slides along the guide groove and enters the outer convex portion, the connecting plate can move in a direction away from the lower die seat, and when the guide block slides from the guide groove to the inner concave portion, the connecting plate can move in a direction close to the lower die seat; A positioning plate is fixedly provided at the top end of the support rod, and the positioning plate is located on the side of the support rod away from the lower die seat. When the support rod pulls one end of the stripping plate to flip it 90 degrees, the originally horizontal part of the stripping plate is rotated to a vertical state and is limited between the lower die seat and the positioning plate. A limiting axis is elastically provided on one side of the boss close to the support rod, a limiting hole matching the limiting axis is provided on the support rod, a top block is provided in the limiting hole, the top block passes through the support rod and is elastically connected to the support rod, a magnet is fixedly provided on one end of the top block passing through the support rod, a strip groove is provided on the vertical plate along its height direction, the magnet slides in the strip groove, a magnetic plate matching the magnet is fixedly embedded on the inner wall of the strip groove, and the magnet has the same magnetic pole on a side opposite to the magnetic plate.

2. A plastic mold that is easy to demould according to claim 1, characterized in that: A pressing frame is provided on the sliding sleeve of the transverse part of the support rod.

3. A plastic mold that is easy to demould according to claim 2, characterized in that: A second hydraulic rod is arranged below the pressing frame, and a telescopic end of the second hydraulic rod is fixedly connected to the pressing frame.

4. A plastic mold that is easy to demould according to claim 1, characterized in that: The lower die base and the vertical plate are fixedly connected via a fixing strip.

Images