Multi-link drive synchronous reverse ejection mechanism for injection mold

Abstract

The present invention relates to a multi-link drive synchronous reverse ejection mechanism of an injection mold, comprising a movable mold, a slider and a ejector block, wherein the slider is slidably arranged on the movable mold, a ejector rod is horizontally movably penetrated in the slider, the ejector block is located in the slider and mounted on the end of the ejector rod, a guide groove is formed on the ejector rod, a groove wall of the guide groove is a first guide slope inclined at 45°, a driving rod is vertically movably penetrated in the slider, an inclined groove is formed on the top of the driving rod, the groove bottom of the inclined groove is a second guide slope inclined at 45°, the second guide slope contacts the first guide slope, so that the driving rod and the ejector rod are connected at 90°, a guide driving block is provided at the bottom of the driving rod, a guide block is further provided below the driving rod, the guide block is fixed on the movable mold, a third guide slope inclined at 45° is formed on the guide block, and the guide driving block contacts the third guide slope. The present invention installs the guide block on the movable mold side, realizes synchronous reverse ejection of the ejector block through multi-link transmission, has a wide range of application, and is more practical.

Description

Technical Field

[0001] The invention relates to a multi-link driving synchronous reverse ejection mechanism for an injection mold, belonging to the technical field of injection molds. Background Art

[0002] The spring block is one of the most common mechanisms in the mold. Generally, when there are relatively deep ribs on the product, a spring block needs to be designed to prevent the product from sticking to the slider and deforming and being scrapped during demolding. In order to achieve the synchronous ejection of the spring block when the slider is withdrawn, the spring block generally needs to be designed with a guide block on the fixed mold side. When the mold is opened, the guide block of the fixed mold supports the ejector rod of the spring block and does not move, while the slider retreats under the drive of the inclined guide column, thereby realizing the reverse ejection of the spring block. The drive of the conventional spring block depends on the fixed mold guide block, and the conventional spring block only moves during the mold opening process, with a small scope of application and poor practicality. In addition, when the slider has a long stroke and needs to be driven by a cylinder, the slider does not move during the mold opening process. Therefore, the conventional spring block solution driven by the fixed mold guide block during the mold opening process is not valid, that is, the conventional spring block technology cannot be implemented on the cylinder slider. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-link driven synchronous reverse ejection mechanism suitable for an injection mold of an oil cylinder driven slide block structure in view of the shortcomings of the prior art.

[0004] To achieve the purpose, the technical solution adopted by the present invention is:

[0005] The multi-link driven synchronous anti-top mechanism of the injection mold comprises a movable mold, a slider and a top block, the slider is slidably arranged on the movable mold, a top rod is horizontally movably penetrated in the slider, the top block is located in the slider and installed at the end of the top rod, a guide groove is formed on the top rod, a groove wall of the guide groove is a first guide inclined surface inclined at 45°, a driving rod is vertically movably penetrated in the slider, an inclined groove is formed on the top of the driving rod, the groove bottom of the inclined groove is a second guide inclined surface inclined at 45°, the second guide inclined surface contacts the first guide inclined surface, so that the driving rod and the top rod are connected at 90°, a guide driving block is provided at the bottom of the driving rod, a guide block is also provided below the driving rod, the guide block is fixed on the movable mold, a third guide inclined surface inclined at 45° is formed on the guide block, and the guide driving block contacts the third guide inclined surface.

[0006] As a further optimization of the above technical solution: a reset slope is also formed on the guide block, the reset slope and the third guide slope have opposite inclination directions, and the highest part of the guide block is formed between the reset slope and the third guide slope.

[0007] As a further optimization of the above technical solution: a push rod hole for horizontal movement of the push rod is formed in the sliding block, the end of the push rod hole is connected with a spring hole, the diameter of the spring hole is larger than the push rod hole, a contact step is formed between the spring hole and the push rod hole, a first return spring is sleeved on the push rod, a nut is installed at the end of the push rod, the first return spring and the nut are both located in the spring hole, and the two ends of the first return spring are in contact with the contact step and the nut respectively.

[0008] As a further optimization of the above technical solution: a second return spring is provided on the top of the driving rod, a pressure block is provided above the driving rod, the pressure block is fixed on the sliding block, and both ends of the second return spring are in contact with the driving rod and the bottom of the pressure block respectively.

[0009] As a further optimization of the above technical solution: a limit block is installed on the side of the driving rod, a driving hole for vertical movement of the driving rod is formed in the sliding block, a limit groove is formed on the side of the driving hole, the limit block is located in the limit groove and can move up and down in the limit groove, a stop block is provided at the bottom of the limit groove, the stop block is fixed on the sliding block, the limit block moves up and down synchronously with the driving rod, and when the limit block contacts the stop block, the limit block and the driving rod stop moving downward.

[0010] As a further optimization of the above technical solution: the guide drive block is a plurality of rollers hinged on the bottom of the drive rod, and the rollers are in contact with the third guide inclined surface.

[0011] As a further optimization of the above technical solution: there are two rollers in total, a pin is passed through the bottom of the driving rod, and the two rollers are respectively installed at both ends of the pin.

[0012] As a further optimization of the above technical solution: the inclined groove occupies 1 / 3 of the thickness of the top of the driving rod, and a spring groove is formed on the other 2 / 3 of the thickness of the top of the driving rod, the end of the second return spring is located in the spring groove, and the two ends of the second return spring are respectively in contact with the bottom of the spring groove and the bottom of the pressure block.

[0013] Compared with the prior art, the present invention installs the guide block on the movable mold side, can realize the reverse ejection of the ejector block on the structure of the oil cylinder driving the slider, and can adjust the installation position of the guide block and the position of the roller on the third guide inclined plane, so that the ejector block on the slider can be reversed at any stage and the displacement of the reverse ejection of the ejector block can be adjusted, so the application range is wide and more practical; the multi-link transmission is realized by the driving rod and the ejector rod, so that the ejector block can be reversed, the structure is ingenious, the demoulding is stable, the occupied space is saved, the manufacturing cost is reduced, and it is more practical; the third guide inclined plane is inclined at 45°, and the second guide inclined plane and the first guide inclined plane are both inclined at 45°, so that the reverse ejection distance D3 of the ejector block is equal to the backward distance D1 of the slider, so that the ejector block can realize synchronous reverse ejection during the movement of the slider, and the reverse ejection ejector block loosens or ejects the features such as deep ribs that are easy to stick to the mold from the mold surface, so as to prevent the product from sticking to the slider and deforming and being scrapped during demoulding; the elastic force release of the second reset spring and the first reset spring and the guidance of the reset inclined plane make the ejector block automatically reset after the reverse ejection, so as to prevent interference with the subsequent undercut demoulding process of the slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention during mold closing.

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the top block during the top-up process of the present invention.

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure after the top block inverts in the present invention.

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the present invention.

[0018] Figure 5 It is a schematic diagram of the three-dimensional structure of the driving rod in the present invention.

[0019] Figure 6 It is a three-dimensional structural schematic diagram of the ejector rod and ejector block in the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Figure 1-6As shown, the multi-link driven synchronous anti-elevation mechanism of the injection mold includes a movable mold 14, a slider 13 and an ejector block 1. The slider 13 is slidably arranged on the movable mold 14. The ejector rod 2 is horizontally and movably penetrated in the slider 13. The ejector block 1 is located in the slider 13 and mounted on the end of the ejector rod 2. A guide groove 21 is formed in the middle of the ejector rod 2. One groove wall of the guide groove 21 is a first guide slope 22 inclined at 45°. A driving rod 3 is vertically and movably penetrated in the slider 13. An inclined groove 31 is formed on the top of the driving rod 3. The groove bottom of the inclined groove 31 is a second guide slope 32 inclined at 45°. The second guide slope 32 contacts the first guide slope 22, so that the driving rod 3 and the ejector rod 2 are connected at 90°. A guide driving block is provided at the bottom of the driving rod 3. A guide block 8 is also provided below the driving rod 3. The guide block 8 is fixed on the movable mold 14. A third guide slope 81 inclined at 45° is formed on the guide block 8. The guide driving block contacts the third guide slope 81.

[0021] In the above technical solution: the guide driving block is a plurality of rollers 10 hinged to the bottom of the driving rod 3 , and the rollers 10 are in contact with the third guide inclined surface 81 .

[0022] In the above technical solution: a reset slope 82 is also formed on the guide block 8, and the reset slope 82 and the third guide slope 81 are inclined in opposite directions. The reset slope 82 and the third guide slope 81 make the top of the guide block 8 triangular, and the highest part 83 of the guide block 8 is formed between the reset slope 82 and the third guide slope 81.

[0023] In the above technical solution: a push rod hole 131 is formed in the slider 13 for the push rod 2 to move horizontally, and the end of the push rod hole 131 is connected to a spring hole 132, the diameter of the spring hole 132 is larger than the push rod hole 131, and a contact step 133 is formed between the spring hole 132 and the push rod hole 131. A first return spring 7 is sleeved on the push rod 2, and a nut 6 is installed at the end of the push rod 2. The first return spring 7 and the nut 6 are both located in the spring hole 132, and the two ends of the first return spring 7 are in contact with the contact step 133 and the nut 6 respectively.

[0024] In the above technical solution, a second return spring 4 is provided on the top of the driving rod 3. A pressing block 5 is provided above the driving rod 3, and the pressing block 5 is fixed on the slider 13. The two ends of the second return spring 4 are in contact with the driving rod 3 and the bottom of the pressing block 5 respectively.

[0025] In the above technical solution: a limit block 12 is installed on the side of the bottom end of the driving rod 3, a driving hole for the vertical movement of the driving rod 3 is formed in the slider 13, and a limit groove 134 is formed on the side of the driving hole. The limit block 12 is located in the limit groove 134 and can move up and down in the limit groove 134. A stop block 11 is provided at the bottom of the limit groove 134, and the stop block 11 is fixed on the slider 13. The limit block 12 moves up and down synchronously with the driving rod 3. When the limit block 12 contacts the stop block 11, the limit block 12 and the driving rod 3 stop moving downward, and the downward reset stroke of the driving rod 3 is controlled.

[0026] In the above technical solution: the inclined groove 31 occupies 1 / 3 of the thickness of the top of the driving rod 3, and a spring groove 33 is formed on the other 2 / 3 of the thickness of the top of the driving rod 3. The end of the second return spring 4 is located in the spring groove 33, and the two ends of the second return spring 4 are respectively in contact with the bottom of the spring groove 33 and the bottom of the pressure block 5.

[0027] In the above technical solution: there are two rollers 10 in total, a pin shaft 9 is passed through the bottom of the driving rod 3, and the two rollers 10 are respectively installed at both ends of the pin shaft 9.

[0028] The working process of the present invention is as follows: after the injection molding machine is finished, the mold is opened. Figure 1 As shown, the roller 10 is in contact with the third guide slope 81, and the limit block 12 is in contact with the stop block 11, preventing the drive rod 3 from moving downward under the guidance of the roller 10 and the third guide slope 81. At this time, the mechanism is in a stationary state.

[0029] When the slider 13 is driven by the oil cylinder, the slider 13 drives the driving rod 3 and the roller 10 to start retreating (moving to the left), the roller 10 moves upward along the third guide slope 81 synchronously, the roller 10 drives the driving rod 3 to move upward, and the second return spring 4 is compressed; under the guidance of the second guide slope 32 and the first guide slope 22, the upward driving rod 3 causes the ejector rod 2 to move rightward relative to the slider 13, so that the ejector block 1 is ejected to the right relative to the slider 13, as shown in FIG. Figure 2 As shown, the reverse ejection of the ejection block 1 is achieved, and at this time the first return spring 7 is compressed.

[0030] When the slider 13 retreats a distance of D1, and the slider 13 drives the driving rod 3 and the roller 10 to generate a horizontal displacement of D1 at the same time, the roller 10 drives the driving rod 3 to move upward a distance of D2 under the guidance of the third guide slope 81, and the upward driving rod 3 causes the ejector rod 2 and the ejector block 1 to generate a horizontal movement distance of D3 relative to the slider 13, that is, the ejector block 1 is ejected in the opposite direction relative to the slider 13 by a distance of D3; because the third guide slope 81 is inclined at 45°, according to the principle that the two straight sides of an isosceles right triangle are equal, D2=D1; and because the second guide slope 32 and the first guide slope 22 are both inclined at 45°, according to the principle that the two straight sides of an isosceles right triangle are equal, D3=D2. Therefore, D3=D2=D1, and the distance D3 of the ejector block 1 ejected in the reverse direction is equal to the distance D1 of the slider 13 retreated, so that the ejector block 1 can realize synchronous reverse ejection during the movement of the slider 13. The reverse ejector block 1 can loosen or eject the deep ribs and other features that are easy to stick to the mold from the mold surface, so as to prevent the product from sticking to the slider during demolding and being deformed and scrapped. Figure 2 In the process, the roller 10 moves to the highest part 83 of the guide block 8, which is the maximum value of D2 and D3. After the top block 1 pushes back to loosen the deep ribs or other features that are easy to stick to the mold or pushes them out of the mold surface, it is not necessary to keep the top state during the whole process of the slider 13 pulling the core.

[0031] When the slider 13 continues to retreat (move to the left), the bottom of the roller 10 is separated from the highest part 83, the lower end of the roller 10 loses support, and the elastic force of the second return spring 4 is released, so that the roller 10 starts to move down along the return slope 82, and the drive rod 3 moves down synchronously; the elastic force of the first return spring 7 is released, so that the ejector rod 2 and the ejector block 1 move to the left relative to the slider 13 and reset; until the limit block 12 moves down to contact the stop block 11, the drive rod 3 stops moving down, and the ejector block 1 is reset. Figure 3 Afterwards, the driving rod 3, the ejector rod 2, the ejector block 1 and other structures continue to move leftward and backward along with the slider 13 until the slider 13 completes the undercut demoulding.

[0032] Similarly, when the slider 13 starts to move rightward and reset, the drive rod 3, the push rod 2 and the push block 1 move in the reverse direction of the above-mentioned moving process until they are restored to the right position. Figure 1 original state.

[0033] In the present invention, the guide block 8 is installed on the movable mold side, and the top block can be reversed on the structure of the oil cylinder driving the slider. By adjusting the installation position of the guide block 8 and the position of the roller 10 on the third guide inclined surface 81, the top block 1 on the slider 13 can be reversed at any stage and the displacement of the top block 1 can be adjusted. The application range is wide and more practical. The multi-link transmission is realized by the driving rod 3 and the top rod 2, so that the top block 1 can be reversed. The structure is ingenious, the demoulding is stable, the occupied space is saved, the manufacturing cost is reduced, and it is more practical. The third guide inclined surface 81 is 45 The second guide bevel 32 and the first guide bevel 22 are all inclined at 45°, so that the distance D3 of the top block 1 being ejected in the reverse direction is equal to the distance D1 of the slider 13 being retreated, so that the top block 1 can be synchronously reversed during the movement of the slider 13, and the reversed top block 1 can loosen or eject the deep ribs and other features that are easy to stick to the mold from the mold surface, so as to prevent the product from sticking to the slider and being deformed and scrapped during demolding; the elastic force of the second reset spring 4 and the first reset spring 7 is released and the reset bevel 82 is guided so that the top block 1 is automatically reset after being reversed, so as to prevent interference with the subsequent undercut demolding process of the slider 13.

[0034] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should fall within the protection scope of the present invention.

Claims

1. A multi-link driven synchronous reverse ejection mechanism for an injection mold, comprising a movable mold (14), a slider (13) and an ejection block (1), wherein the slider (13) is slidably arranged on the movable mold (14), and is characterized in that A push rod (2) is horizontally movably provided in the slider (13), the push block (1) is located in the slider (13) and mounted on the end of the push rod (2), a guide groove (21) is formed on the push rod (2), a groove wall of the guide groove (21) is a first guide inclined surface (22) inclined at 45 degrees, a driving rod (3) is vertically movably provided in the slider (13), a top of the driving rod (3) is formed with an inclined groove (31), and the bottom of the inclined groove (31) is a second guide inclined surface inclined at 45 degrees. (32), the second guide inclined surface (32) contacts the first guide inclined surface (22), so that the driving rod (3) and the push rod (2) are connected at 90 degrees, a guide driving block is provided at the bottom of the driving rod (3), and a guide block (8) is further provided below the driving rod (3), the guide block (8) is fixed on the movable mold (14), and a third guide inclined surface (81) inclined at 45 degrees is formed on the guide block (8), and the guide driving block contacts the third guide inclined surface (81).

2. The multi-link driven synchronous ejection mechanism for injection mold according to claim 1, characterized in that The guide block (8) is also provided with a reset slope (82), the reset slope (82) and the third guide slope (81) having inclination directions opposite to each other, and the highest portion (83) of the guide block (8) is formed between the reset slope (82) and the third guide slope (81).

3. The multi-link driven synchronous ejection mechanism for injection mold according to claim 1, characterized in that The slider (13) is provided with a push rod hole (131) for the push rod (2) to move horizontally. The end of the push rod hole (131) is connected to a spring hole (132). The diameter of the spring hole (132) is larger than that of the push rod hole (131). A contact step (133) is formed between the spring hole (132) and the push rod hole (131). A first return spring (7) is sleeved on the push rod (2). A nut (6) is installed at the end of the push rod (2). The first return spring (7) and the nut (6) are both located in the spring hole (132). The two ends of the first return spring (7) are in contact with the contact step (133) and the nut (6) respectively.

4. The multi-link driven synchronous ejection mechanism for injection mold according to claim 1, characterized in that A second return spring (4) is provided at the top of the driving rod (3), a pressure block (5) is provided above the driving rod (3), the pressure block (5) is fixed on the slider (13), and two ends of the second return spring (4) are in contact with the bottom of the driving rod (3) and the pressure block (5), respectively.

5. The multi-link driven synchronous ejection mechanism for injection mold according to claim 1, characterized in that A limit block (12) is installed on the side of the driving rod (3); a driving hole for vertical movement of the driving rod (3) is formed in the slider (13); a limit slot (134) is formed on the side of the driving hole; the limit block (12) is located in the limit slot (134) and can move up and down in the limit slot (134); a stop block (11) is provided at the bottom of the limit slot (134); the stop block (11) is fixed on the slider (13); the limit block (12) moves up and down synchronously with the driving rod (3); when the limit block (12) contacts the stop block (11), the limit block (12) and the driving rod (3) stop moving downward.

6. The multi-link driven synchronous ejection mechanism for injection mold according to claim 1, characterized in that The guide drive block is a plurality of rollers (10) hinged to the bottom of the drive rod (3), and the rollers (10) are in contact with the third guide inclined surface (81).

7. The multi-link driven synchronous ejection mechanism for injection mold according to claim 6, characterized in that There are two rollers (10) in total, a pin shaft (9) is passed through the bottom of the driving rod (3), and the two rollers (10) are respectively mounted on both ends of the pin shaft (9).

8. The multi-link driven synchronous ejection mechanism for injection mold according to claim 4, characterized in that The inclined groove (31) occupies 1 / 3 of the thickness of the top of the driving rod (3), and a spring groove (33) is formed on the other 2 / 3 of the thickness of the top of the driving rod (3). The end of the second return spring (4) is located in the spring groove (33), and the two ends of the second return spring (4) are respectively in contact with the bottom of the spring groove (33) and the bottom of the pressure block (5).

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