Lower ejection mechanism of press machine

Abstract

According to the lower ejection mechanism of the press machine, a fixing sleeve and a plurality of limiting strips are arranged on an ejector plate, the limiting strips are annularly arranged and distributed at intervals, each limiting strip is provided with an inner arc face, a cylindrical inner cavity is formed between the inner arc faces, and an ejector pin is installed in the cylindrical inner cavity; the fixing sleeve is provided with a limiting cavity, the limiting cavity comprises a first end, an opening is formed in the first end of the limiting cavity, the limiting strip and the ejector pin enter the limiting cavity of the fixing sleeve through the opening, the fixing cover is in threaded connection with the opening of the fixing sleeve, the limiting strip is limited in the limiting cavity, and the limiting cavity tightens the limiting strip. The diameter of the cylindrical inner cavity is consistent with that of the ejector pin, so that the inner cambered surface is fixedly connected with the ejector pin. According to the utility model, by arranging the quick-release structure of the fixing sleeve, the fixing cover and the limiting strip, the disassembly and assembly efficiency of the ejector pin is improved, and the practicability is good.

Description

Technical Field

[0001] This utility model relates to the field of ejector mechanism technology, and more specifically, to a lower ejector mechanism for a press. Background Technology

[0002] The lower ejector mechanism (also known as the lower ejector device) is the core of the press's demolding system. It is used to eject the finished workpiece or waste material from the ejection hole of the lower die (cavity die) to prevent the workpiece from getting stuck in the die due to suction or mechanical clamping. The lower ejector mechanism is usually installed in the frame space below the lower die platen. The lower ejector mechanism includes ejector pins, ejector pin fixing plates, ejector pin support plates, and drive cylinders. The ejection process involves the drive cylinder pushing the ejector pin support plate, aligning the ejector pins with the ejection hole, and then passing the ejector pin through the alignment hole to eject the product. In the prior art, due to issues such as ejector pin breakage, wear, or adjusting the ejector pin height, frequent disassembly of the ejector pins is required. Therefore, a lower ejector mechanism for the press is proposed. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To solve the above problems, this utility model provides a lower ejector mechanism for a press. By setting a quick-release structure with a fixed sleeve, a fixed cover and a limiting strip, it is easy to disassemble the ejector pin. Moreover, the limiting strip and the ejector pin are fastened together, which helps to reduce wear during the disassembly and assembly of the ejector pin.

[0005] (II) Technical Solution

[0006] A lower ejector mechanism for a press includes an ejector pin and an ejector pin plate. The ejector pin plate has a fixed sleeve and several limiting strips. The limiting strips are arranged in a circumferential direction and spaced apart. Each limiting strip has an inner arc surface, and the inner arc surfaces form a cylindrical inner cavity for mounting the ejector pin. The fixed sleeve has a limiting cavity with an opening on one side. The limiting strips enter the limiting cavity through the opening. The limiting cavity is used to tighten the limiting strips as a whole. The fixed sleeve is detachably connected to a fixed cover at the opening. The fixed cover has a through-hole for the ejector pin to pass through. The fixed cover abuts against the end of the limiting strip and limits the limiting strip within the limiting cavity.

[0007] Furthermore, the end of the ejector pin is provided with a limiting circular plate, the diameter of which is larger than that of the ejector pin. The limiting strip is provided with a limiting groove, the limiting grooves of adjacent limiting strips are connected, and several circumferentially distributed limiting grooves are fitted into the limiting circular plate.

[0008] Furthermore, the ejector plate is provided with a connecting hole, and a wear-resistant ring is provided inside the connecting hole. The adjusting sleeve is movably disposed inside the wear-resistant ring, and the adjusting sleeve is connected to the fixing sleeve.

[0009] Furthermore, the adjusting sleeve is equipped with a rack, which is arranged along the length of the adjusting sleeve. The adjusting sleeve is movably connected to a gear, which meshes with the rack. The gear is equipped with a central shaft, which is driven to rotate by a drive device. When the drive device is running, the gear drives the rack to move along the length of the adjusting sleeve.

[0010] Furthermore, the drive device includes a main shaft and a drive motor. A first transmission wheel is provided on the main shaft, and the drive motor has an output shaft. A second transmission wheel is provided on the output shaft. A transmission chain is sleeved between the first transmission wheel and the second transmission wheel, so that the output shaft drives the main shaft to rotate. The main shaft is also provided with a first helical gear, and the central shaft is provided with a second helical gear. Through the meshing of the first helical gear and the second helical gear, the main shaft drives the central shaft to rotate.

[0011] Furthermore, it also includes a first support plate and a second support plate. The first support plate is fixedly connected to the ejector plate, and the second support plate is used to connect to the output end of the push cylinder. The first support plate and the second support plate are connected by adjusting bolts and nuts. Spring washers are sleeved on the outside of the adjusting bolts, and the ends of the spring washers abut against the surfaces of the first support plate and the second support plate, respectively.

[0012] Furthermore, the first support plate is provided with a guide rod, which is used to pass through the guide hole of the lower template of the press, so that the ejector plate fixed with the first support plate moves to the lower template along the direction of the guide rod, and the ejector pin is aligned with the top outlet of the lower template.

[0013] Furthermore, a return spring is sleeved on the outside of the guide rod. One end of the return spring abuts against the ejector plate, and the other end abuts against the lower template. When the ejector plate moves towards the lower template, the distance between the ejector plate and the lower template gradually decreases. As the return spring gradually compresses, it generates a restoring force that returns the ejector plate to its original position.

[0014] (III) Beneficial Effects

[0015] This invention provides a lower ejector mechanism for a press. A limiting strip enters a limiting cavity through an opening. A fixed cover is threaded onto the opening of a fixed sleeve, limiting the limiting strip within the limiting cavity. The limiting cavity tightens the limiting strip, making the diameter of the cylindrical inner cavity match the diameter of the ejector pin, thus securing the ejector pin to the inner arc surface. This invention, through its installation structure of the fixed sleeve, fixed cover, and limiting strip, improves the efficiency of ejector pin assembly and disassembly, is simple to operate, and has good practicality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is an assembly diagram (I) of the wear-resistant ring, adjusting sleeve, fixing sleeve, gear and limiting strip in this utility model (before the adjusting sleeve moves);

[0018] Figure 3 This is an assembly diagram (II) of the wear-resistant ring, adjusting sleeve, fixing sleeve, gear and limiting strip in this utility model (after the adjusting sleeve is moved);

[0019] Figure 4 for Figure 2 Sectional view at point aa;

[0020] Figure 5 This is a separate view of the wear-resistant ring, adjusting sleeve, fixing sleeve, gear, and limiting strip in this utility model;

[0021] Figure 6 This is a schematic diagram of the limiting strip in this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the ejector pin in this utility model;

[0023] Figure 8 This is the bottom view of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Ejector pin; 2. Ejector pin plate; 3. Fixing cover; 4. Fixing sleeve; 5. First transmission wheel; 6. Return spring; 7. Guide rod; 8. Push cylinder; 9. First support plate; 10. Second support plate; 11. Nut; 12. Bolt; 13. Spring washer; 14. Adjusting sleeve; 15. Stop edge; 16. Wear ring; 17. Limiting cavity; 18. Second end; 19. Limiting strip; 20. Gear; 21. Rack; 22. Through port; 23. Cylindrical inner cavity; 24. Drive motor; 25. First end; 26. Strip hole; 27. Limiting groove; 28. Limiting circular plate; 29. ​​Main shaft; 30. Central shaft; 31. Second transmission wheel. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] See Figures 1 to 8This utility model discloses a lower ejector mechanism for a press, comprising an ejector pin 1 and an ejector pin plate 2. The ejector pin plate 2 has a connecting hole, from the edge to the center of which are arranged a wear-resistant ring 16, an adjusting sleeve 14, a fixing sleeve 4, and several limiting strips 19. The wear-resistant ring 16 may be made of hard alloy material to prevent the hole diameter from expanding or deforming due to wear. The adjusting sleeve 14 is slidably disposed within the wear-resistant ring 16, and a stop 15 is provided at the top of the adjusting sleeve 14, which abuts against the end of the wear-resistant ring 16 to limit the lowest descent position of the adjusting sleeve 14. The fixing sleeve 4 and the adjusting sleeve 14 are integrally formed. The limiting strips 19 are arranged in a circumferential direction and spaced apart. The limiting strips 19 have an inner arc surface, and the inner arc surfaces form a cylindrical inner cavity 23 for mounting the ejector pin 1. The fixing sleeve 4 is provided with a limiting cavity 17, which includes a first end 25 and a second end 18. The cross-sectional diameter of the limiting cavity 17 gradually decreases from the first end 25 to the second end 18, forming an inverted frustum shape. The outer surface of the limiting strip 19 is also set as an inclined surface. The inner wall of the limiting cavity 17 fits against the outer surface of the limiting strip 19, so that when the limiting cavity 17 acts on the limiting strip 19, the several circumferentially arranged limiting strips 19 converge as a whole, and the cylindrical inner cavity 23 moves towards the center line ( Figure 4 The dotted line shown is the center line. When the cylinder cavity 23 and the ejector pin 1 are symmetrical, the inner arc surface clamps the ejector pin 1.

[0028] The first end 25 of the limiting cavity 17 has an opening, through which the limiting strip 19 enters the limiting cavity 17. The fixing sleeve 4 is threadedly connected to the fixing cover 3 at the opening. The fixing cover 3 has a through-hole 22 through the ejector pin 1. The through-hole 22 is larger than the diameter of the inner arc surface from the center line of the cylindrical inner cavity 23 but smaller than the diameter of the outermost edge of the limiting strip 19 from the center line of the cylindrical inner cavity 23, so that the fixing cover 3 abuts against the end of the limiting strip 19, limiting the limiting strip 19 within the limiting cavity 17.

[0029] The ejector pin 1 has a limiting circular plate 28 at one end away from the ejector end. The diameter of the limiting circular plate 28 is larger than that of the ejector pin 1. The depth of the cylindrical inner cavity 23 is H. The limiting strip 19 has a limiting groove 27 at a distance greater than 1 / 2H and less than 2 / 3H from the ejector end. The limiting grooves 27 of adjacent limiting strips 19 are connected. Several circumferentially distributed limiting grooves 27 fit into the limiting circular plate 28. This arrangement can ensure that the ejector pin 1 has sufficient depth in the cylindrical inner cavity 23 to ensure the clamping force of the limiting strip 19, and can also avoid repeatedly checking the fitting depth.

[0030] In this embodiment, the rack 21 is disposed on the inner wall of the adjusting sleeve 14, and the gear 20 is movably disposed within the adjusting sleeve 14. However, in actual applications, for ease of assembly, the rack 21 and gear 20 can also be disposed on the outside of the adjusting sleeve 14. The rack 21 is disposed along the length of the adjusting sleeve 14, and the gear 20 meshes with the rack 21. The gear 20 is splined to the central shaft 30, and a second helical gear 20 is disposed on the central shaft 30. A strip hole 26 is disposed on the adjusting sleeve 14, and the central shaft 30 passes through the strip hole 26 and meshes with the first helical gear 20 disposed on the main shaft 29 of the drive device through the second helical gear 20. The drive motor 24 of the drive device is provided with an output shaft, and a second transmission wheel 31 is disposed on the output shaft. A first transmission wheel 5 is disposed on the main shaft 29. Both the first transmission wheel 5 and the second transmission wheel 31 are toothed wheels. A transmission chain is sleeved between the first transmission wheel 5 and the second transmission wheel 31, so that the output shaft drives the main shaft 29 to rotate. The main shaft 29 has first helical gears 20 at both ends, and the central shaft 30 has a second helical gear 20. The two central shafts 30 are symmetrically arranged with respect to the main shaft 29, that is, one main shaft 29 has four central shafts 30. Through the meshing of the first and second helical gears 20, the main shaft 29 drives the central shafts 30 to rotate. The above structure is suitable for small-range adjustment of the height of the ejector pin 1. The linkage structure of the helical gears 20 can realize the rotation of four central shafts 30 by one motor. It can not only adjust the ejector end of the ejector pin 1 to be inside the ejector hole of the lower template or flush with the end face of the ejector hole, but also synchronize the positions of multiple ejector pins 1, keep the ejector ends of the ejector pins 1 flush, and improve work efficiency.

[0031] This utility model also includes a first support plate 9 and a second support plate 10. The first support plate 9 and the ejector plate 2 are fixedly connected. The second support plate 10 is used to connect the output end of the push cylinder 8. The first support plate 9 and the second support plate 10 are connected by an adjusting bolt 12 and a nut 11. A spring washer 13 is sleeved on the outside of the adjusting bolt 12. The structure of the bolt 12, nut 11 and spring washer 13 can strengthen the connection between the first support plate 9 and the second support plate 10, thereby improving the overall strength. The height of the ejector 1 can be adjusted by setting multiple spring washers 13 and appropriately adjusting the distance between the first support plate 9 and the second support plate 10.

[0032] The first support plate 9 is provided with a guide rod 7, which is used to pass through the guide hole of the lower template of the press, so that the ejector plate 2 fixed with the first support plate 9 moves to the lower template along the direction of the guide rod 7, and the ejector 1 is aligned with the top outlet of the lower template.

[0033] A return spring 6 is sleeved on the outside of the guide rod 7. When the push cylinder 8 is not in action, one end of the return spring 6 abuts against the ejector plate 2 and the other end abuts against the lower template. When the ejector plate 2 moves towards the lower template, the distance between the ejector plate 2 and the lower template gradually decreases. When the return spring 6 is gradually compressed, the return spring 6 generates a restoring force that makes the ejector plate 2 return to its original position.

[0034] In this invention, if the workpiece has a large adsorption force in the mold cavity, the pressure of the workpiece on the ejector pin 1 will also be relatively large. This pressure will be concentrated between the gear 20 and the rack 21. At this time, a locking block can be set in the adjusting sleeve 14. The meshing teeth of the locking block can further restrict the rotation of the gear 20, and the locking block can also provide a supporting force to the gear 20, thereby reducing the pressure on the workpiece and avoiding wear on the gear 20 and the rack 21.

[0035] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A lower knockout mechanism of a press machine comprising a knockout pin (1) and a knockout pin plate (2), characterized in that: The ejector plate (2) is provided with a fixed sleeve (4) and a plurality of limiting strips (19), the limiting strips (19) are arranged in a ring shape and are distributed at intervals, the limiting strips (19) are provided with inner arc surfaces, and the inner arc surfaces form a cylindrical inner cavity (23) therebetween, the cylindrical inner cavity (23) is used for mounting the ejector pin (1); the fixed sleeve (4) is provided with a limiting cavity (17), one side of the limiting cavity (17) is provided with an opening, the limiting strips (19) enter the limiting cavity (17) through the opening, the limiting cavity (17) is used for tightening the plurality of limiting strips (19) as a whole, the fixed sleeve (4) is detachably connected with a fixed cover (3) at the opening, the fixed cover (3) is provided with a through hole (22) for the ejector pin (1) to pass through, and the fixed cover (3) abuts against the end of the limiting strip (19) to limit the limiting strip (19) in the limiting cavity (17).

2. A lower ejector mechanism for a press machine according to claim 1, characterized in that An end of the ejector pin (1) is provided with a limiting circular plate (28), the limiting circular plate (28) has a diameter greater than that of the ejector pin (1), the limiting strip (19) is provided with a limiting groove (27), the limiting grooves (27) of adjacent limiting strips (19) are communicated, and a plurality of ring-shaped limiting grooves (27) are embedded in the limiting circular plate (28).

3. A lower ejector mechanism for a press machine as claimed in claim 1, wherein The ejector plate (2) is provided with a connecting hole, the connecting hole is further provided with a wear-resistant ring (16) and an adjusting sleeve (14), the adjusting sleeve (14) is movably arranged in the wear-resistant ring (16), and the adjusting sleeve (14) is connected with the fixed sleeve (4).

4. A lower ejector mechanism for a press machine according to claim 3, characterized in that The adjusting sleeve (14) is provided with a rack (21), the rack (21) is arranged along the length direction of the adjusting sleeve (14), the adjusting sleeve (14) is movably connected with a gear (20), the gear (20) is in meshing connection with the rack (21), the gear (20) is provided with a central shaft (30), the central shaft (30) is driven to rotate through a driving device, and when the driving device operates, the gear (20) drives the rack (21) to move along the length direction of the adjusting sleeve (14).

5. A lower ejector mechanism for a press machine as claimed in claim 4, wherein The driving device comprises a main shaft (29) and a driving motor (24), the main shaft (29) is provided with a first transmission wheel (5), the driving motor (24) is provided with an output shaft, the output shaft is provided with a second transmission wheel (31), a transmission chain is sleeved between the first transmission wheel (5) and the second transmission wheel (31), so that the main shaft (29) rotates; the main shaft (29) is further provided with a first helical gear (20), the central shaft (30) is provided with a second helical gear (20), and the first helical gear (20) and the second helical gear (20) are in meshing connection, so that the main shaft (29) drives the central shaft (30) to rotate.

6. A lower ejector mechanism for a press machine as claimed in claim 1, wherein ,Still further comprise a first support plate (9) and a second support plate (10), the first support plate (9) and the ejector plate (2) are fixedly connected, the second support plate (10) is used for connecting the output end of the push cylinder (8), the first support plate (9) and the second support plate (10) are connected through adjusting bolt (12) and nut (11), the adjusting bolt (12) is externally provided with spring washer (13), and the spring washer (13) is respectively abutted on the plate surface of the first support plate (9) and the second support plate (10).

7. A lower ejector mechanism for a press machine as claimed in claim 6, wherein ,The first support plate (9) is provided with a guide rod (7), the guide rod (7) is used for penetrating into the guide hole of the lower die plate of the press, so that the ejector plate (2) fixed with the first support plate (9) moves to the lower die plate along the direction of the guide rod (7), and the ejector pin (1) is aligned with the top outlet of the lower die plate.

8. A lower knockout mechanism for a press machine according to claim 7, characterized in that ,The guide rod (7) is externally provided with a reset spring (6), one end of the reset spring (6) is abutted on the ejector plate (2), and the other end is abutted on the lower die plate, when the ejector plate (2) moves to the lower die plate, the distance between the ejector plate (2) and the lower die plate gradually decreases, when the reset spring (6) is gradually compressed, the reset spring (6) generates a reset force to make the ejector plate (2) return to the original position.

Images