Material lifting device and mold

Abstract

The utility model belongs to the technical field of stamping dies, and relates to a material lifting device and a die. The material lifting device comprises a mounting frame, a material lifting device and a material conveying device, the material lifting block is rotationally connected to the mounting frame through a rotating shaft, the material lifting block can swing between a first position and a second position around the rotating shaft, and in the die assembly process, the punch is in contact with the material lifting block to drive the material lifting block to rotate from the first position to the second position; and the balancing weight is connected to the material lifting block, and the balancing weight provides power for rotation of the material lifting block from the second position to the first position. According to the utility model, the balancing weight is arranged on the material lifting block, so that the material lifting block can be driven to rotate from the second position to the first position under the action of the balancing weight during demolding, and resetting is realized; the reset mode is simple in structure and convenient to assemble, so that the cost can be effectively reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of stamping die technology, and in particular relates to a material lifting device and a die. Background Technology

[0002] In stamping dies, the lifting mechanism is an important auxiliary device used to lift materials or parts during the stamping process for the next step.

[0003] The design and function of the lifting mechanism are crucial for improving production efficiency and ensuring product quality. For example, patent application number CN201920717429.0 discloses a lifting mechanism with positioning function, including a base. At one end of the base, there is a connecting mounting hole for a lifting block and a mounting hole for an elastic element. The lifting block is pinned into the mounting hole. In the mounting hole for the elastic element, a ball bearing, a ball bearing pad, an elastic element, and a stop screw for adjusting the extension and retraction of the elastic element are installed in sequence. The outer circumference of the ball bearing abuts against one end of the ball bearing pad and the lifting block, and the other end of the ball bearing pad contacts the elastic element.

[0004] However, the aforementioned patent achieves the resetting of the lifting block through an elastic element. To install the spring, mounting holes for the elastic element need to be made in the base, and the elastic element also needs to be installed and fixed using structures such as ball bearing pads and fixing screws; the entire resetting structure consists of multiple parts. On the one hand, manufacturing multiple parts increases production costs; on the other hand, assembling multiple parts also increases production steps and affects production efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a material lifting device and a mold. The material lifting device has a simple structure, is quick to assemble, and can effectively save costs and improve production efficiency.

[0006] In a first aspect, this utility model provides a material lifting device, comprising:

[0007] The mounting bracket is installed on the lower mold.

[0008] The lifting block is rotatably connected to the mounting frame via a rotating shaft. The lifting block can swing around the rotating shaft between the first position and the second position. During the mold closing process, the punch contacts the lifting block and drives the lifting block to rotate from the first position to the second position.

[0009] The counterweight is connected to the lifting block and provides power for the lifting block to rotate from the second position to the first position.

[0010] Optionally, the counterweight is vertically connected to the lifting block.

[0011] Optionally, a limiting mechanism is also included, which restricts the lifting block in the first position from rotating in a direction away from the second position.

[0012] Optional, the limiting mechanism includes:

[0013] The limiting block is set on the mounting frame or counterweight. When the lifting block is in the first position, the two sides of the limiting block are in contact with the mounting frame and the counterweight respectively.

[0014] Optionally, the limiting mechanism may also include:

[0015] The shim is placed on the mounting frame or counterweight. When the lifting block is in the first position, the two sides of the shim are in contact with the mounting frame and the counterweight, respectively.

[0016] Optionally, the pad is an airbag buffer pad, which is in a compressed state when the lifting block is in the first position.

[0017] Optionally, the airbag cushioning pad has air jets that can purge the contact points between the limit block and the mounting bracket.

[0018] Optionally, the lifting block is provided with a chamfer, which is used to guide the movement of the material sheet.

[0019] Optionally, a torsion spring is also included, with the spring body of the torsion spring sleeved outside the rotating shaft, one torsion arm of the torsion spring fixed relative to the lifting block, and the other torsion arm of the torsion spring fixed relative to the mounting bracket.

[0020] Secondly, this utility model provides a mold, including any of the lifting devices described above, wherein multiple lifting devices are spaced apart along the outer edge of the material sheet.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This invention, by setting a counterweight on the lifting block, enables the lifting block to rotate from the second position to the first position during demolding, thereby achieving reset. This reset method has a simple structure and is easy to assemble, thus effectively reducing costs and improving production efficiency. Attached Figure Description

[0023] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0024] Figure 1 This is a diagram showing the state of the present invention during mold closing;

[0025] Figure 2 This is a perspective view of the present utility model;

[0026] Figure 3 This utility model Figure 2 Cross-sectional view;

[0027] Figure 4 This is a schematic diagram showing the installation of the torsion spring and the limiting rod of this utility model;

[0028] Figure 5 This is a perspective view of the material lifting block of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the airbag cushioning pad of this utility model.

[0030] In the diagram: 1. Mounting bracket; 11. Mounting groove; 12. Positioning surface; 13. Guide surface; 14. Base plate; 15. Bracket; 2. Lifting block; 21. Chamfer; 3. Rotating shaft; 4. Punch; 5. Counterweight; 6. Limiting mechanism; 61. Limiting block; 62. Limiting rod; 63. Shim; 631. Airbag buffer pad; 6311. Air jet hole; 7. Torsion spring; 8. Lower die. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0033] Example 1

[0034] Please refer to Figure 1This utility model provides a material lifting device, which includes a mounting frame 1, which is mounted on the upper end face of the lower mold 8. A mounting groove 11 is formed on the mounting frame 1, extending horizontally to both sides of the mounting frame 1. A lifting block 2 is rotatably connected to the mounting groove 11 via a rotating shaft 3. Both the proximal end (closer to the material sheet) and the distal end of the lifting block 2 can extend out of the mounting frame 1 from the mounting groove 11. The proximal end of the lifting block 2 contacts the material sheet, and a counterweight 5 is connected to the distal end of the lifting block 2. The position where the proximal end of the lifting block 2 rotates upward to its highest point is the first position (reference). Figure 3 The position where the near end of lifting block 2 rotates downward to its lowest point is the second position (reference). Figure 1 The counterweight 5 ensures that the lifting block 2 remains in the first position. This invention, by replacing the complex reset mechanism with the counterweight 5, saves production costs and improves work efficiency.

[0035] It should be noted that the lifting block 2 can also be rotatably connected to the outer wall of the mounting frame 1. In this solution, the two ends of the rotating shaft 3 are respectively connected to the two side walls of the mounting groove 11, which can evenly distribute the impact force acting on the rotating shaft 3 and reduce or avoid jamming.

[0036] It should be noted that, for the convenience of subsequent maintenance, the rotating shaft 3 can be detachably installed on the mounting bracket 1; in this solution, the rotating shaft 3 is detachably installed by bolting.

[0037] It should be noted that the counterweight 5 and the lifting block 2 can be connected and fixed by integral molding, or by bolting, snapping, welding or bonding.

[0038] Specifically, during the mold closing process, the upper mold moves to the lower mold 8, and the punch 4 set on the upper mold strikes the near end of the lifting block 2, causing the near end of the lifting block 2 to flip downward around the pivot 3. Correspondingly, the counterweight 5 is driven to flip upward. During this process, the material placed on the lifting block 2 falls into the forming chamber of the lower mold 8 and is formed in the forming chamber.

[0039] During demolding, the upper mold moves upward and gradually moves away from the lower mold 8. When the punch 4 separates from the near end of the lifting block 2, the counterweight 5 rotates downward around the rotating shaft 3 under the action of gravity, thereby driving the near end of the lifting block 2 to rotate from bottom to top, thus achieving reset.

[0040] As a preferred option, refer to Figure 3 When the lifting block 2 is in the first position, the upper surface of the near end of the lifting block 2 remains horizontal, so that the lifting block 2 can form surface contact with the material sheet when it is in the first position.

[0041] As a preferred option, refer to Figure 2 , Figure 3 The mounting frame 1 includes a base plate 14 and a bracket 15 (the mounting groove 11 is set on the bracket 15). The base plate 14 is fixed on the lower mold 8, and the bracket 15 is set on the base plate 14.

[0042] It should be noted that the base plate 14 is preferably fixed to the lower mold 8 by bolting, and the connection between the bracket 15 and the base plate 14 can be by welding or integral molding; the base plate 14 and the bracket 15 form an L-shaped or T-shaped structure.

[0043] It should be noted that the reference Figure 3 The angle α between the counterweight 5 and the lifting block 2 ranges from 0 to 360 degrees.

[0044] As a preferred option, refer to Figure 3 When the lifting block 2 is in the first position, the counterweight 5 is located below the lifting block 2, and the angle α between the counterweight 5 and the lifting block 2 is 90 degrees. This design lowers the center of gravity of the entire structure, increases balance, and improves response speed.

[0045] As a preferred option, refer to Figure 3 A chamfer 21 is provided at the near end of the lifting block 2, preferably a rounded corner. By providing the chamfer 21, the workpiece can be easily dropped during mold closing, and the edges of the lifting block 2 can be prevented from scratching the material sheet during the mold closing process.

[0046] As a preferred option, refer to Figure 4 A torsion spring 7 is also provided, with its spring body sleeved outside the rotating shaft 3. The two torsion arms of the torsion spring 7 are fixed relative to the lifting block 2 and the mounting bracket 1, respectively. This method can absorb the impact force of the punch 4 on the lifting block 2, and also provide power for the lifting block 2 to reset, thereby increasing the reset speed of the lifting block 2.

[0047] It should be noted that the torsion spring 7 can also be replaced by a tension spring (not shown in the figure of this scheme). One end of the tension spring is fixed relative to the counterweight 5 or the lifting block 2, and the other end of the tension spring is fixed relative to the mounting bracket 1. When the lifting block 2 is in the first position, the tension spring is in the natural state, and when the lifting block 2 is in the second position, the tension spring is in the stretched state.

[0048] As a further preferred option, there are two torsion springs 7, symmetrically arranged at both ends of the rotating shaft 3.

[0049] As a preferred option, refer to Figure 3 A limiting mechanism 6 is also provided, which can restrict the lifting block 2 from continuing to rotate upward after the near end of the lifting block 2 reaches the first position.

[0050] It should be noted that, in order to prevent the near end of the lifting block 2 from continuing to rotate downward after reaching the second position, a corresponding limiting structure can also be set to limit the lifting block 2. In this solution, a first limiting surface is set on the lower end surface of the lifting block 2 (when the lifting block 2 is in the first position), and a second limiting surface is set in the mounting groove 11. When the lifting block 2 reaches the second position, the first limiting surface and the second limiting surface fit together to prevent the near end of the lifting block 2 from continuing to rotate downward.

[0051] As a further preferred option, refer to Figure 3 , Figure 5 The limiting mechanism 6 uses a limiting block 61, which is set on the side of the lower end of the counterweight 5 near the support 15 (or the limiting block 61 can be fixed on the support 15 at the corresponding position). When the near end of the lifting block 2 is in a horizontal state (i.e. the lifting block 2 is in the first position), the limiting block 61 contacts the support 15, thereby limiting the near end of the lifting block 2 from continuing to rotate upward.

[0052] It should be noted that the limiting mechanism 6 can also be installed in the mounting slot 11, see reference. Figure 4 For example, the limiting mechanism 6 uses a limiting rod 62. When the proximal end of the lifting block 2 rotates upward to the first position, the limiting rod 62 prevents the proximal end of the lifting block 2 from continuing to rotate upward. Specifically, when the limiting rod 62 is set on the side of the rotating shaft 3 near the proximal end of the lifting block 2, the limiting rod 62 is located above the lifting block 2; when the limiting rod 62 is set on the side of the rotating shaft 3 near the counterweight 5, the limiting rod 62 is located below the lifting block 2.

[0053] Example 2

[0054] Because the impact force when the limiting block 61 contacts the bracket 15 is relatively large, the limiting block 61 or the bracket 15 may be damaged after long-term use, resulting in a decrease in accuracy. The inventors have made further improvements to the limiting mechanism 6 based on Embodiment 1.

[0055] refer to Figure 3 A pad 63 is provided on the bracket 15. The pad 63 is located between the counterweight 5 and the bracket 15 (the lifting block 2 is located in the first position), and the two ends of the pad 63 are in contact with the counterweight 5 and the bracket 15 respectively.

[0056] When the pad 63 is made of a hard material, when the limit block 61 collides with the bracket 15, the counterweight 5 also collides with the pad 63, which increases the contact area during the impact, reduces the impact force that needs to be borne per unit area, and effectively extends the service life of the device.

[0057] It should be noted that the shim 63 can also be fixed to the counterweight 5.

[0058] It should be noted that a mounting hole (preferably a stepped hole) is provided in the middle of the gasket 63, through which the gasket 63 can be bolted to the bracket 15.

[0059] As a preferred embodiment, the gasket 63 is made of elastic material. Before the limiting block 61 comes into contact with the bracket 15, the gasket 63 comes into contact with the counterweight 5. The gasket 63 shrinks to absorb the impact force, thereby reducing the impact force when the limiting block 61 hits the bracket 15 and effectively extending the service life of the device.

[0060] It should be noted that in this solution, the gasket 63 can be a disc spring, a rubber pad, an airbag buffer pad 631, etc.

[0061] As a further preferred option, refer to Figure 6 The gasket 63 is an airbag buffer pad 631, and an air jet hole 6311 is opened on the airbag buffer pad 631. When it is impacted, the airbag is compressed, which can absorb the impact force on the one hand, and spray gas through the air jet hole 6311 on the other hand. The gas blows the contact position between the limit block 61 and the bracket 15 to prevent impurities in the processing process from getting stuck between the limit block 61 and the bracket 15, which would cause the lifting block 2 to fail to reset.

[0062] It should be noted that the reference Figure 6 The airbag cushion 631 is a hollow structure with one end open. In this design, the airbag cushion 631 has an incompressible section and a compressible section that can automatically recover, and the two are connected to each other. The air jet hole 6311 is set on the incompressible section.

[0063] It should be noted that the airbag cushioning pad 631 has an outwardly turned-up skirt at the open end, and the airbag cushioning pad 631 is attached to the bracket 15 by means of the skirt.

[0064] Example 3

[0065] This utility model provides a mold having multiple lifting devices as described in the above embodiments, with the multiple lifting devices respectively disposed at the edge of the material sheet.

[0066] The material sheet is supported by contact between the upper surfaces of multiple lifting blocks 2 (lifting blocks 2 in the first position) and the material sheet. The side of the bracket 15 closest to the material sheet is the positioning surface 12. The positioning surface 12 of multiple mounting brackets 1 limits the outer edge of the material sheet, thus achieving the initial positioning of the material sheet.

[0067] As a preferred embodiment, a guide surface 13 is provided on the top of the positioning surface 12 to guide the material sheet to fall onto the lifting block 2. The guide surface 13 can be either an arc surface or an inclined surface.

[0068] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A material lifting device, characterized in that, include: Mounting bracket (1), which is set on the lower mold (8); The lifting block (2) is rotatably connected to the mounting frame (1) via the rotating shaft (3). The lifting block (2) can swing around the rotating shaft (3) between the first position and the second position. During the mold closing process, the punch (4) contacts the lifting block (2) and drives the lifting block (2) to rotate from the first position to the second position. The counterweight (5) is connected to the lifting block (2) and provides power for the lifting block (2) to rotate from the second position to the first position.

2. The material lifting device according to claim 1, characterized in that, The counterweight (5) is vertically connected to the lifting block (2).

3. The material lifting device according to claim 2, characterized in that, It also includes a limiting mechanism (6), in which the lifting block (2) in the first position is restricted by the limiting mechanism (6) to rotate away from the second position.

4. The material lifting device according to claim 3, characterized in that, The limiting mechanism (6) includes: Limiting block (61) is set on mounting frame (1) or counterweight (5). When lifting block (2) is in the first position, the two sides of limiting block (61) are in contact with mounting frame (1) and counterweight (5) respectively.

5. The material lifting device according to claim 4, characterized in that, The limiting mechanism (6) also includes: The shim (63) is set on the mounting frame (1) or the counterweight (5). When the lifting block (2) is in the first position, the two sides of the shim (63) are in contact with the mounting frame (1) and the counterweight (5) respectively.

6. The material lifting device according to claim 5, characterized in that, The pad (63) is an airbag buffer pad (631). When the lifting block (2) is in the first position, the airbag buffer pad (631) is in a compressed state.

7. The material lifting device according to claim 6, characterized in that, The airbag cushioning pad (631) has a jet hole (6311) that sprays gas to purge the contact point between the limit block (61) and the mounting bracket (1).

8. The material lifting device according to claim 1, characterized in that, The lifting block (2) is provided with a chamfer (21), which is used to guide the movement of the material sheet.

9. The material lifting device according to claim 1, characterized in that, It also includes a torsion spring (7), the spring body of the torsion spring (7) is sleeved outside the rotating shaft (3), one torsion arm of the torsion spring (7) is fixed relative to the lifting block (2), and the other torsion arm of the torsion spring (7) is fixed relative to the mounting bracket (1).

10. A mold comprising the material lifting device according to any one of claims 1-9, characterized in that, Multiple lifting devices are spaced apart along the outer edge of the material sheet.

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