Quick die changing device of closed double-point press and die changing method thereof

Abstract

The present application belongs to the technical field of press equipment, especially to a quick die changing device and method of closed double-point press; the present application comprises: a pair of die changing mechanisms symmetrically arranged on the press frame; the die changing mechanism is used for assisting the installation of the die on the lower die holder on the upper die holder; two die pushing hydraulic cylinders are symmetrically arranged on both sides of the lower die holder and used for driving the die changing mechanism to move; the die changing mechanism comprises: a connecting seat connected with the die pushing hydraulic cylinder; a lifting seat connected with the inner surface of the connecting seat and used for driving the die to lift; a pair of support plates connected with the lifting seat and used for supporting the bottom of the die; the lower die holder is provided with a groove matched with the support plate; the present application can drive the die to lift and correct the front and rear and left and right positions of the die, so as to quickly correct the position of the die and improve the die changing efficiency.

Description

Technical Field

[0001] This invention relates to the field of press equipment technology, and in particular to a quick mold changing device and method for a closed-type two-point press. Background Technology

[0002] Sheet metal pressing and punching all require the use of press equipment and the necessary molds. Different molds are needed for different workpieces. In the process of multi-variety small-batch production, the interval between mold changes is getting shorter and shorter, and the frequency of mold changes is also getting higher and higher. At present, mold changes of presses mostly adopt mold changing carriage devices. This device is arranged on one side of the press. When changing molds, the mold is pushed in and pulled out through hooks.

[0003] Traditional mold changing methods mostly rely on manual replacement. The mold is placed on the lower mold base, and the mold position is not precise due to skew. The position of the lower mold base needs to be adjusted manually. Since the mold itself is heavy, adjusting the mold position is not only time-consuming and laborious, but the movement of the mold on the lower mold base will also cause certain wear on the surface of the lower mold base. Therefore, long-term use will damage the press platform and make it difficult to meet the use requirements of the press. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a quick mold changing device and method for a closed-type dual-point press. By installing mold changing mechanisms on both sides of the machine base, the mold changing mechanisms can drive the mold to rise and automatically correct its position, thus solving the problem of cumbersome mold changing in the prior art.

[0005] To achieve the above technical objectives, the specific technical solution of the present invention is as follows: The present invention proposes a quick mold changing device for a closed-type double-point press, comprising: a pair of mold changing mechanisms symmetrically arranged on the press frame; the mold changing mechanisms are used to assist in installing the mold on the lower mold base onto the upper mold base; two push-mold hydraulic cylinders are symmetrically arranged on both sides of the lower mold base to drive the mold changing mechanisms to move.

[0006] The mold changing mechanism includes: a connecting seat connected to the push mold hydraulic cylinder; a lifting seat connected to the inner surface of the connecting seat for driving the mold to rise and fall; and a pair of support plates connected to the lifting seat for supporting the bottom of the mold. The lower mold base is provided with a groove that cooperates with the support plate.

[0007] As a preferred embodiment of the present invention, a worm gear is connected to the lifting seat, a guide rod is fixedly connected to the worm gear, a lifting motor is installed on the connecting seat, a worm wheel that meshes with the worm gear is connected to the lifting motor, and a guide block that is slidably connected to the guide rod is fixedly connected to the connecting seat.

[0008] In a preferred embodiment of the present invention, a threaded rod is connected to the lifting seat, one end of which is connected to a first gear. A rack that meshes with the first gear is fixedly connected to the inner surface of the connecting seat. A threaded block is connected to the threaded rod, and a connecting frame is fixedly connected to the threaded block. The connecting frame is fixedly connected to the support plate, and the lifting seat is provided with a limiting guide rail for sliding and limiting the connecting frame. When the lifting seat rises, the first gear rotates along the rack, driving the threaded rod to rotate. When the threaded rod rotates, it drives the threaded block to move outward, thereby driving the support plate to move outward.

[0009] As a preferred embodiment of the present invention, the support plate is provided with a plurality of circular grooves, and a support wheel assembly that can change orientation is rotatably connected in the circular grooves for supporting the mold.

[0010] As a preferred embodiment of the present invention, the side of the support plate is provided with a receiving groove, and a movable connecting rod is connected in the receiving groove. One end of the connecting rod is connected to a pushing mechanism. The connecting rod is provided with a support rod corresponding to each of the support wheel assemblies. The support wheel assembly is connected with a shaft, and a connecting rod is connected between the shaft and the support rod. The pushing mechanism drives the connecting rod to move, causing each support wheel assembly to rotate simultaneously to different directions, so that the mold can move in different directions.

[0011] As a preferred embodiment of the present invention, the connecting rod is provided with a pair of stops for limiting the movement position of the connecting rod.

[0012] As a preferred embodiment of the present invention, a driving mechanism is connected to the support plate for moving the mold on the support plate; the driving mechanism includes: a positioning wheel mounted on the mounting frame, the positioning wheel being used to position the mold and move it; a driving motor for driving the positioning wheel to rotate; a second gear is mounted on the driving motor, a third gear meshing with the second gear is connected to the positioning wheel, and a coaxially rotating transmission wheel is connected to the second gear, and a transmission belt is connected between the two transmission wheels.

[0013] As a preferred embodiment of the present invention, a positioning plate for positioning one side of the mold is fixedly connected to the connecting seat.

[0014] As a preferred embodiment of the present invention, a support rod is rotatably connected to the lower surface of the lifting seat, and a roller for supporting the support plate is connected to the support rod, and a tension spring is fixedly connected between the support rod and the lifting seat.

[0015] A rapid mold changing method for a closed-loop two-point press includes the following steps:

[0016] Step 1: The mold is placed on the lower mold base. The two push mold hydraulic cylinders drive the two mold changing mechanisms to move closer to the mold, and the support plate moves into the groove.

[0017] Step 2: The lifting motor drives the lifting seat to rise, which in turn drives the mold to rise. During the process of the lifting seat rising, both support plates on the same lifting seat move towards the mold. The positioning wheel contacts the side of the mold and pushes the mold to move on the support plate, thus correcting its left and right position.

[0018] Step 3: The pushing mechanism drives the connecting rod to move, and the connecting rod drives the support wheel assembly to rotate 90° so that its rolling direction is parallel to the conveying direction of the positioning wheel; the drive motor drives the positioning wheel to rotate, and moves the mold to the positioning plate position to correct its front and rear position;

[0019] Step 4: After the mold is aligned in all four directions, the upper mold base is lowered and inserted into the mold. The mold is then secured using bolts.

[0020] The beneficial effects of this invention are as follows: By providing a pair of mold changing mechanisms on both sides of the lower mold base, when the mold changing mechanism changes the mold, the lifting seat drives the mold to rise, and during the rising process, the support plate moves outward, the positioning wheel contacts the mold surface, automatically corrects the left and right position of the mold, and the drive motor drives the positioning wheel to rotate, driving the mold to move on the support plate, correcting the front and rear position of the mold, achieving the purpose of quickly correcting the mold position, and improving the efficiency of mold changing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a quick mold changing device for a closed-type two-point press proposed in this invention.

[0022] Figure 2 This is a schematic diagram of the structure of the lower mold base of the present invention.

[0023] Figure 3 This is a schematic diagram of the mold changing mechanism of the present invention.

[0024] Figure 4 for Figure 3 A partial structural diagram.

[0025] Figure 5 This is a schematic diagram of the mold changing mechanism of the present invention from another angle.

[0026] Figure 6 This is a bottom view schematic diagram of the mold changing mechanism of the present invention.

[0027] Figure 7 This is a schematic diagram of the support plate of the present invention.

[0028] Figure 8 This is a schematic diagram of the connecting rod and support wheel assembly of the present invention.

[0029] In the diagram: 1. Press frame; 2. Lower die holder; 21. Groove; 3. Die; 4. Upper die holder; 5. Die changing mechanism; 51. Connecting seat; 52. Lifting seat; 53. Support plate; 531. Connecting rod; 532. Support wheel assembly; 533. Shaft; 534. Connecting rod; 535. Support rod; 536. Stop; 537. Pushing mechanism; 538. Circular groove; 539. Receiving groove; 54. Drive mechanism; 540. Mounting bracket; 541. Second gear; 542. 543. Transmission wheel; 544. Positioning wheel; 545. Third gear; 546. Transmission belt; 547. Drive motor; 58. Connecting frame; 59. Limiting guide rail; 50. Threaded rod; 510. Threaded block; 511. First gear; 52. Rack; 53. Worm gear; 542. Guide rod; 543. Worm wheel; 544. Lifting motor; 55. Positioning plate; 56. Support rod; 57. Roller; 58. Tension spring; 59. Guide block; 60. Push mold hydraulic cylinder. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Example 1

[0032] This embodiment discloses a quick mold changing device for a closed-loop two-point press, such as... Figures 1-8 As shown, the present invention includes a pair of mold changing mechanisms 5 symmetrically arranged on the press frame 1; the mold changing mechanism 5 is used to assist in installing the mold 3 on the lower mold base 2 onto the upper mold base 4; two push mold hydraulic cylinders 6 are installed on the press frame 1 and symmetrically arranged on both sides of the lower mold base 2. The push mold hydraulic cylinders 6 are used to drive the mold changing mechanism 5 to move closer to the mold 3, and when the mold changing mechanism 5 is not in use, it moves to the positions on both sides of the lower mold base 2 without affecting the normal operation of the press.

[0033] like Figure 3 and Figure 5 As shown, the mold changing mechanism 5 includes: a connecting seat 51 connected to the mold pushing hydraulic cylinder 6, the connecting seat 51 having a U-shaped structure; a lifting seat 52 connected to the inner surface of the connecting seat 51, which can move up and down, the connecting seat 51 being used to drive the mold 3 to rise and fall; a worm gear 511 connected to the lifting seat 52, a guide rod 512 fixedly connected to the worm gear 511, a lifting motor 514 mounted on the back of the connecting seat 51, a worm wheel 513 meshing with the worm gear 511 connected to the lifting motor 514, and a guide block 519 slidably connected to the guide rod 512 fixedly connected to the connecting seat 51; the lifting motor 514 drives the worm wheel 513 to rotate, and when the worm wheel 513 rotates, it drives the worm gear 511 and the lifting seat 52 to rise.

[0034] like Figure 4 As shown, a threaded rod 57 is connected to the lifting seat 52. A pair of threaded rods 57 are symmetrically connected to the lifting seat 52. One end of each threaded rod 57 is connected to a first gear 59. A rack 510 meshing with the first gear 59 is fixedly connected to the inner surface of the connecting seat 51. A threaded block 58 is connected to the threaded rod 57 and slidably connected to the surface of the lifting seat 52. A connecting frame 55 is fixedly connected to the threaded block 58. A support plate 53 is fixedly connected to one end of the connecting frame 55. The support plate 53 supports the bottom of the mold 3. The lower mold base 2 has a groove 21 that mates with the support plate 53, without affecting the normal use of the lower mold base 2. The lifting seat 52 has a limiting guide rail 56 for limiting the sliding movement of the connecting frame 55. The limiting guide rail 56 has an inverted L-shaped structure, ensuring stable left and right positions when the support plate 53 moves. The limiting guide rail 56 also limits the sliding movement of the connecting frame 55. The frame 55 applies downward pressure. Due to the large pressure of the mold 3's own weight on the support plate 53, the limiting guide rail 56 ensures the stability of the support plate 53 in supporting the mold 3. The push mold hydraulic cylinder 6 drives the mold changing mechanism 5 to move closer to the lower mold base 2, so that the support plate 53 is inserted into the groove 21, and the support plate 53 moves to the position below the mold 3. When the lifting motor 514 drives the lifting seat 52 to rise, the support plate 53 supports the mold 3 and drives the mold 3 to rise, so that the mold 3 is separated from the lower mold base 2. During the rising process of the lifting seat 52, the first gear 59 rotates along the rack 510, which drives the threaded rod 57 to rotate. When the two threaded rods 57 rotate, they drive the two threaded blocks 58 to move outward, which in turn drives the support plate 53 to move outward, increasing the contact area between the support plate 53 and the mold 3 and improving the stability of the support for the mold 3.

[0035] like Figure 7As shown, a drive mechanism 54 is connected to the support plate 53. The drive mechanism 54 is located at one end of the support plate 53 near the connecting seat 51. The drive mechanism 54 is used to drive the mold 3 to move back and forth on the support plate 53 to correct the front and back position of the mold 3. In this embodiment, the drive mechanism 54 includes: a positioning wheel 543, which is mounted on the mounting bracket 540. The mounting bracket 540 is fixedly connected to the support plate 53. The positioning wheel 543 is used to position the mold 3 in the left and right directions and drive it to move; a drive motor 546, which is mounted on the mounting bracket 540 and is used to drive the positioning wheel 543 to rotate. The two drive mechanisms 54 share a drive motor 546. A second gear 541 is mounted on the drive motor 546, and a gear 541 is connected to the positioning wheel 543. The third gear 544 meshes with the second gear 541, and a coaxially rotating transmission wheel 542 is connected to the second gear 541. A transmission belt 545 connects the two transmission wheels 542. When the lifting seat 52 rises, the support plate 53 moves outward until the positioning wheel 543 contacts the side of the mold 3. As the support plate 53 continues to move outward, the positioning wheel 543 squeezes the sides of the mold 3, causing the mold 3 to move. Since the mold 3 is initially tilted on the support plate 53, the four positioning wheels 543 limit the sides of the mold 3, thus correcting its left and right positions. The drive motor 546 drives the positioning wheel 543 to rotate. When the positioning wheel 543 rotates, it causes the mold 3 to move back and forth on the support plate 53, thus correcting its front and back positions.

[0036] Preferably, a positioning plate 515 for positioning one side of the mold 3 is fixedly connected to the connecting seat 51. The mold 3 moves to the position of the positioning plate 515 to make its front and back positions accurate.

[0037] Preferred, such as Figure 6 As shown, since the mold 3 itself is relatively heavy, in order to prevent the support plate 53 from being bent and damaged, a support rod 516 is rotatably connected to the lower surface of the lifting seat 52. A roller 517 for supporting the support plate 53 is connected to the support rod 516. The roller 517 contacts the lower surface of the support plate 53, and a tension spring 518 is fixedly connected between the support rod 516 and the lifting seat 52. The tension spring 518 applies tension to the support rod 516, and the tension of the tension spring 518 makes the roller 517 support the support plate 53 stably.

[0038] Example 2

[0039] Based on the structure of Embodiment 1 above, the difference lies in that, because the mold 3 itself is relatively heavy, the friction between the mold 3 and the support plate 53 is large when it moves on the support plate 53, resulting in poor movement and the possibility that the driving force is insufficient to move the mold. To facilitate smooth movement of the mold 3, as follows... Figures 7-8As shown, the support plate 53 has several circular grooves 538. A support wheel assembly 532, whose orientation can be changed, is rotatably connected within each groove 538. The support wheel assembly 532 is existing technology and includes a support wheel and a wheel frame. The support wheel assembly 532 protrudes from the circular grooves 538 to support the mold 3, significantly reducing the friction between the mold 3 and the support plate 53. Furthermore, the side of the support plate 53 has a receiving groove 539, within which a movable connecting rod 531 is connected. One end of the connecting rod 531 is connected to… The pushing mechanism 537, which can be an electric push rod, is mounted on the connecting frame 55. The connecting rod 531 has support rods 535 corresponding to the support wheel assemblies 532. A shaft 533 is connected to the support wheel assembly 532, and a connecting rod 534 connects the shaft 533 and the support rods 535. The pushing mechanism 537 drives the connecting rod 531 to move. When the connecting rod 531 moves, it can simultaneously rotate each support wheel assembly 532 to different directions, thus enabling the mold 3 to rotate. It can move in different directions; a pair of stops 536 are provided on the connecting rod 531 to limit the movement position of the connecting rod 531; when the stop 536 at the left end of the connecting rod 531 contacts the inner wall of the receiving groove 539, the conveying direction of the support wheel assembly 532 is perpendicular to the length direction of the support plate 53, and the mold 3 can move back and forth on the support plate 53 to correct its back and forth position; after the connecting rod 531 moves, when the stop 536 at the right end contacts the inner wall of the receiving groove 539, the support wheel assembly 532 rotates 90°, and the conveying direction of the support wheel assembly 532 is parallel to the length of the support plate 53, and the mold 3 can move left and right on the support plate 53 to correct its left and right position; in this embodiment, by providing a movable connecting rod 531 and a rotatable support wheel assembly 532, the movement of the connecting rod 531 can drive the support wheel assembly 532 to rotate 90°, changing the conveying direction of the support wheel assembly 532, so that the mold 3 can move in four directions, which facilitates the correction of the mold position.

[0040] The rapid mold change method based on Embodiment 2 above includes the following steps:

[0041] Step 1: The mold 3 is placed on the lower mold base 2. The two push mold hydraulic cylinders 6 drive the two mold changing mechanisms 5 to move closer to the mold 3, and the support plate 53 moves into the groove 21.

[0042] Step 2: The lifting motor 514 drives the lifting seat 52 to rise, which in turn drives the mold 3 to rise. During the rising process of the lifting seat 52, the two support plates 53 on the same lifting seat 52 move towards the mold 3. The positioning wheel 543 contacts the side of the mold 3 and pushes the mold 3 to move on the support plate 53 to correct its left and right position.

[0043] Step 3: The pushing mechanism 537 drives the connecting rod 531 to move, and the connecting rod 531 drives the support wheel assembly 532 to rotate 90° so that its rolling direction is parallel to the conveying direction of the positioning wheel 543; the drive motor 546 drives the positioning wheel 543 to rotate, and drives the mold 3 to the position of the positioning plate 515 to correct its front and rear position.

[0044] Step 4: After the four directions of mold 3 are corrected, the upper mold base 4 is lowered and inserted into mold 3, and the mold is fixed by bolt assembly.

[0045] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A quick mold changing device for a closed-type two-point press, characterized in that, include: A pair of mold changing mechanisms (5) are symmetrically arranged on the press frame (1); The mold changing mechanism (5) is used to assist in installing the mold (3) on the lower mold base (2) onto the upper mold base (4); Two push-die hydraulic cylinders (6) are symmetrically arranged on both sides of the lower die base (2) to drive the die changing mechanism (5) to move; The mold changing mechanism (5) includes: The connecting seat (51) is connected to the push mold hydraulic cylinder (6); The lifting seat (52) is connected to the inner surface of the connecting seat (51) and is used to drive the mold (3) to rise and fall; A pair of support plates (53) are provided and connected to the lifting seat (52) for supporting the bottom of the mold (3). The lower mold seat (2) is provided with a groove (21) that cooperates with the support plate (53). A worm gear (511) is connected to the lifting seat (52), a guide rod (512) is fixedly connected to the worm gear (511), a lifting motor (514) is installed on the connecting seat (51), a worm wheel (513) meshing with the worm gear (511) is connected to the lifting motor (514), and a guide block (519) slidably connected to the guide rod (512) is fixedly connected to the connecting seat (51). A threaded rod (57) is connected to the lifting seat (52), and a first gear (59) is connected to one end of the threaded rod (57). A rack (510) that meshes with the first gear (59) is fixedly connected to the inner surface of the connecting seat (51). A threaded block (58) is connected to the threaded rod (57), and a connecting frame (55) is fixedly connected to the threaded block (58). The connecting frame (55) is fixedly connected to the support plate (53), and a limiting guide rail (56) for sliding limit of the connecting frame (55) is provided on the lifting seat (52). When the lifting seat (52) rises, the first gear (59) rotates along the rack (510), which drives the threaded rod (57) to rotate. When the threaded rod (57) rotates, it drives the threaded block (58) to move outward, which in turn drives the support plate (53) to move outward. The support plate (53) has several circular grooves (538), and a support wheel assembly (532) that can change orientation is rotatably connected in the circular grooves (538) for supporting the mold (3).

2. The quick mold changing device for a closed-type two-point press according to claim 1, characterized in that, The support plate (53) has a receiving groove (539) on its side. A movable connecting rod (531) is connected in the receiving groove (539). A pushing mechanism (537) is connected to one end of the connecting rod (531). A support rod (535) is provided on the connecting rod (531) and corresponds to the support wheel assembly (532). A shaft (533) is connected to the support wheel assembly (532). A connecting rod (534) is connected between the shaft (533) and the support rod (535). The pushing mechanism (537) drives the connecting rod (531) to move, and drives each support wheel assembly (532) to rotate simultaneously to different directions, so that the mold (3) can move in different directions.

3. The quick mold changing device for a closed-type two-point press according to claim 2, characterized in that, The connecting rod (531) is provided with a pair of stops (536) for limiting the movement position of the connecting rod (531).

4. A quick mold changing device for a closed-type two-point press according to claim 1 or 3, characterized in that, A drive mechanism (54) is connected to the support plate (53) for driving the mold (3) to move on the support plate (53); the drive mechanism (54) includes: a positioning wheel (543) mounted on the mounting frame (540), the positioning wheel (543) for positioning the mold (3) and driving it to move; a drive motor (546) for driving the positioning wheel (543) to rotate; a second gear (541) is mounted on the drive motor (546), a third gear (544) meshing with the second gear (541) is connected to the positioning wheel (543), and a coaxially rotating transmission wheel (542) is connected to the second gear (541), and a transmission belt (545) is connected between the two transmission wheels (542).

5. A quick mold changing device for a closed-type two-point press according to claim 4, characterized in that, A positioning plate (515) for positioning one side of the mold (3) is fixedly connected to the connecting seat (51).

6. A quick mold changing device for a closed-type two-point press according to claim 5, characterized in that, A support rod (516) is rotatably connected to the lower surface of the lifting seat (52). A roller (517) for supporting the support plate (53) is connected to the support rod (516), and a tension spring (518) is fixedly connected between the support rod (516) and the lifting seat (52).

7. A rapid die-changing method for a closed-loop two-point press, utilizing the rapid die-changing device for a closed-loop two-point press as described in claim 6, characterized in that... Includes the following steps: Step 1: The mold (3) is placed on the lower mold base (2). The two push mold hydraulic cylinders (6) drive the two mold changing mechanisms (5) to move closer to the mold (3). The support plate (53) moves into the groove (21). Step 2: The lifting motor (514) drives the lifting seat (52) to rise, which in turn drives the mold (3) to rise. During the rising process of the lifting seat (52), the two support plates (53) on the same lifting seat (52) move towards the mold (3). The positioning wheel (543) contacts the side of the mold (3) and pushes the mold (3) to move on the support plate (53) to correct its left and right position. Step 3: The pushing mechanism (537) drives the connecting rod (531) to move, and the connecting rod (531) drives the support wheel assembly (532) to rotate 90° so that its rolling direction is parallel to the conveying direction of the positioning wheel (543); the drive motor (546) drives the positioning wheel (543) to rotate, and drives the mold (3) to move to the position of the positioning plate (515) to correct its front and rear position; Step 4: After the four directions of the mold (3) are corrected, the upper mold base (4) is lowered and inserted into the mold (3), and the mold is fixed by bolt assembly.

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