A plunger type pre-pressing, locking and mold adjusting device and its use method

Abstract

The present invention is a plunger type pre-stressing locking mold adjustment device and a method of using the same, and relates to the field of high-speed precision forming. The technical solution is a plunger type pre-stressing locking mold adjustment device, comprising a slider, a guide fixing seat is fixed on the slider, an adjusting nut is arranged inside the guide fixing seat, a piston 1 is arranged between one end of the adjusting nut and the guide fixing seat, an adjusting screw is threadedly connected inside the adjusting nut, a cavity is arranged inside the adjusting screw, an oil guide column is arranged inside the cavity, a piston 2 is fixed to one end of the oil guide column, a sealing guide device is sleeved on the outer circumferential surface of the piston 2, the sealing guide device is tightly attached to the inner wall of the cavity, a pre-tightening nut is fixed to the other end of the oil guide column, a first oil circuit connected to the cavity is arranged on the oil guide column, and a second oil circuit connected to the piston 1 is also arranged on the oil guide column. The beneficial effects of the present invention are that the bidirectional pressure enhances the uniformity of the force applied by the hydraulic oil, improves the adjustment accuracy, and eliminates the influence of the motion gap on the bottom dead point of the slider.

Description

Technical Field

[0001] The invention relates to the field of high-speed precision forming, and in particular to a plunger-type pre-pressing, locking and mould-adjusting device and a use method thereof. Background Art

[0002] In addition to high-precision molds, the production of high-quality products is also directly related to the accuracy of the press. Especially in high-speed presses, the importance of the mold adjustment device cannot be ignored. The mold adjustment device plays a key role in maintaining the stable operation of the machine, ensuring product quality and improving production efficiency. First of all, the mold adjustment device can quickly and accurately adjust the position and spacing of the mold according to production needs to adapt to the production of parts of different specifications and sizes. This not only simplifies the operation process, but also significantly improves production efficiency. Secondly, the precise control of the mold adjustment device effectively avoids the frequent contact and separation between the moving pairs when the press is running at high speed, causing strong collisions and violent vibrations, thereby causing improper mold clearance and resulting in part damage or quality degradation, thereby ensuring the stability of product quality. In addition, the mold adjustment device can effectively reduce the failure rate of the machine, extend its service life and reduce maintenance costs. In short, the mold adjustment device of the high-speed press plays a pivotal role in improving production efficiency, ensuring product quality and reducing operating costs.

[0003] In order to improve the accuracy of the mold adjustment device, the existing technology mainly relies on the interaction between hydraulic oil and mechanical parts to eliminate the gap. As shown in the patent with announcement number CN202200575U and announcement date 2012.04.25, a downward force is applied to the screw through hydraulic oil to eliminate the gap between the screw and the worm gear.

[0004] However, the existing mold adjustment device applies a unidirectional force to the screw through hydraulic oil, which will lead to uneven pressure distribution, low adjustment accuracy, easy collision and vibration, and unstable bottom dead point. When the pressure is too high, it is easy to damage the worm gear, and when the pressure is too low, the clearance elimination effect is not ideal. Summary of the invention

[0005] In view of the problem that the existing mold adjusting device has uneven pressure distribution and low adjustment accuracy, which leads to unstable bottom dead point, the present invention provides a plunger-type pre-pressure locking mold adjusting device with uniform pressure distribution, high adjustment accuracy and capable of ensuring the stability of the bottom dead point position, and a method for using the same.

[0006] In order to solve the above problems, the technical solution adopted by the present invention is a plunger-type pre-stressing, locking and adjusting mold device, including a slider, a guide fixing seat is fixed on the slider, an adjusting nut is arranged inside the guide fixing seat, a piston 1 is arranged between one end of the adjusting nut and the guide fixing seat, an adjusting screw is threadedly connected inside the adjusting nut, a cavity is arranged inside the adjusting screw, an oil guide column is arranged inside the cavity, a piston 2 is fixed to one end of the oil guide column, a sealing guide device is sleeved on the outer circumferential surface of the piston 2, the sealing guide device is tightly attached to the inner wall of the cavity, a pre-tightening nut is fixed to the other end of the oil guide column, a first oil circuit connected to the cavity is arranged on the oil guide column, and a second oil circuit connected to the piston 1 is also arranged on the oil guide column; a guide oil circuit is arranged on the guide fixing seat, a main oil circuit is arranged inside the oil guide column, the guide oil circuit is connected to the second oil circuit, the second oil circuit is connected to the main oil circuit, and the main oil circuit is connected to the first oil circuit. The pre-tightening nut can pre-tighten the oil guide column to ensure that the position of the oil guide column remains unchanged. The first oil circuit on the oil guide column can inject hydraulic oil into the cavity. Piston 2 seals the hydraulic oil in the cavity. The hydraulic oil exerts an outward and downward force on the adjusting screw, eliminating the movement gap between the adjusting screw and the adjusting nut. The second oil circuit on the oil guide column can inject hydraulic oil into piston 1. The hydraulic oil can fill the gap of piston 1 and exert an upward force on the adjusting nut. The adjusting screw has a tendency to move downward, and the adjusting nut has a tendency to move upward. Therefore, bidirectional pressure can make the force exerted by the hydraulic oil more uniform and the adjustment accuracy higher. It can ensure that the movement gap between the adjusting screw and the adjusting nut is completely eliminated under the premise of protecting the device. The guide oil circuit provides hydraulic oil to the main oil circuit, and the hydraulic oil is diverted from the main oil circuit to the first oil circuit and the second oil circuit to ensure that the device is fully locked during the pressurization process.

[0007] Preferably, a pre-tightening groove is provided inside the pre-tightening nut, a pre-tightening piston is installed inside the pre-tightening groove, a pre-tightening oil circuit is provided on the pre-tightening nut, and the pre-tightening oil circuit is connected to the pre-tightening groove. Hydraulic oil flows from the pre-tightening oil circuit into the pre-tightening groove, exerts pressure on the pre-tightening piston, and ensures that the precise position of the oil guide column is fixed.

[0008] Preferably, the device further comprises a worm gear box, wherein a worm gear is arranged inside the worm gear box, the inner wall of the worm gear is fixedly connected to the outer wall of the adjusting nut, and a worm matched with the worm gear is arranged inside the worm gear box. Driven by the worm gear, the worm gear rotates and drives the adjusting nut to rotate synchronously, thereby ensuring the precise matching between the adjusting nut and the worm gear and improving the stability and reliability of the device.

[0009] Preferably, a transmission key is provided on the adjusting nut, one side of the transmission key is fixedly connected to the outer wall of the adjusting nut, and the other side of the transmission key is fixedly connected to the inner wall of the worm wheel. The transmission key plays a connecting and guiding role, ensuring reliable transmission and vertical movement between the worm wheel and the adjusting nut, so that the rotation of the worm wheel can be synchronously transmitted to the adjusting nut. The transmission key enhances the stability and reliability of the device, ensuring precise control and efficient operation of the device.

[0010] Preferably, a fixed pressure plate is fixed to the other end of the adjusting nut, and the fixed pressure plate is in close contact with the side of the transmission key. The fixed pressure plate provides a reliable limit for the transmission key, ensuring that it remains stable during operation, thereby improving the reliability of the transmission key.

[0011] Preferably, a fixed sealing plate is provided at the lower end of the worm gear box, a sealing groove is provided on the fixed sealing plate, and a sealing ring is provided inside the sealing groove. The sealing ring in the sealing groove plays a key sealing role, providing a tight sealing effect for the worm gear box and ensuring zero leakage of hydraulic oil.

[0012] Preferably, one end of the adjusting screw away from the adjusting nut is hinged with a connecting rod, which can be reliably connected to the crank of the press to ensure effective transmission of motion and force.

[0013] A method for using a plunger-type pre-pressing, locking and adjusting mold device, the method comprising the following steps:

[0014] ①Pre-adjustment pressure relief: release the pressure of the hydraulic oil in the gap between the cavity and the piston, and part of the hydraulic oil flows back to the oil tank through the oil guide column and the guide fixing seat;

[0015] ②Height adjustment: drive the worm to rotate and adjust the height of the slider; during height adjustment, the motor drives the worm to rotate, the worm drives the worm wheel to rotate, and the worm wheel and the adjusting nut rotate synchronously under the action of the transmission key. Since the adjusting nut and the adjusting screw are connected by a thread pair, the rotation of the adjusting nut will drive the adjusting screw to move up and down, and then drive the slider to move up and down to achieve height adjustment. The worm gear mechanism efficiently transmits the motor rotation to the adjusting nut, and the height adjustment of the adjusting screw is accurately achieved through the thread pair between the adjusting nut and the adjusting screw;

[0016] ③ Pressurize after adjustment: Re-inject the hydraulic oil into the gap between the cavity and the piston until the required pressure is reached.

[0017] It can be seen from the above technical solutions that the advantages of the present invention are: the pre-tightening nut pre-tightens the oil guide column to ensure its stable position. The first oil circuit on the oil guide column injects hydraulic oil into the cavity, and piston two seals the hydraulic oil in the cavity. The hydraulic oil exerts a downward force on the adjusting screw. The second oil circuit on the oil guide column injects hydraulic oil into piston one. The hydraulic oil fills the gap of piston one and exerts an upward force on the adjusting nut, thereby eliminating the movement gap between the adjusting screw and the adjusting nut. The adjusting screw tends to move downward, while the adjusting nut tends to move upward. In summary, the device significantly improves the uniformity of the force applied by the hydraulic oil through bidirectional pressure, improves the adjustment accuracy, and eliminates the influence of the gap between the components on the bottom dead point of the slider. Under the premise of the protective device, it is ensured that the movement gap between the adjusting screw and the adjusting nut is completely eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0020] Figure 2 It is a cross-sectional view of a specific embodiment of the present invention.

[0021] Figure 3 for Figure 2 Sectional view of AA.

[0022] Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0023] Figure 5 for Figure 2 A partial enlarged view of point C in the middle.

[0024] Figure 6 for Figure 2 A partial enlarged view of point D in the middle.

[0025] Figure 7 for Figure 3 A partial enlarged view of point E in the middle.

[0026] Figure 8 for Figure 3 A partial enlarged view of point F in the middle.

[0027] In the figure: 1. slider, 2. guide fixing seat, 21. guide oil circuit, 3. oil guide column, 31. main oil circuit, 32. first oil circuit, 33. second oil circuit, 34. piston two, 35. locking nut, 36. piston one, 37. sealing guide device, 38. cavity, 4. worm gear box, 41. worm, 42. worm gear, 43. fixed sealing plate, 431. sealing groove, 432. sealing ring, 5. adjusting screw, 6. adjusting nut, 61. transmission key, 62. fixed pressure plate, 7. connecting rod, 71. pin, 72. locking cover, 8. pre-tightening nut, 81. pre-tightening groove, 82. pre-tightening piston, 83. pre-tightening oil circuit. DETAILED DESCRIPTION

[0028] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0029] Embodiment 1: A plunger type pre-stressing locking mold adjustment device comprises a slider 1, a guide fixing seat 2 is arranged on the slider 1, the guide fixing seat 2 is fixedly connected to the upper surface of the slider 1 by bolts, an adjusting nut 6 is arranged inside the guide fixing seat 2, an adjusting screw 5 is threadedly connected inside the adjusting nut 6, and a connecting rod 7 is hinged at one end of the adjusting screw 5 away from the adjusting nut 6. A driving device is arranged above the guide fixing seat 2, and the driving device can rotate the adjusting nut 6 to move the adjusting screw 5 up and down, thereby adjusting the height of the slider 1. Specifically, as Figure 1-3 shown.

[0030] In this specific embodiment, the guide fixing seat 2 specifically adopts the following structure: a stepped cylindrical cavity with different diameters is arranged inside the guide fixing seat 2, a circular piston 36 is arranged inside the guide fixing seat 2, one side of the piston 36 abuts against a stepped surface of the guide fixing seat 2, and the other side of the piston 36 abuts against one end of the adjusting nut 6, and a guide oil circuit 21 is arranged on the guide fixing seat 2, and the guide oil circuit 21 provides hydraulic oil for locking the device.

[0031] In this specific embodiment, the adjusting nut 6 specifically adopts the following structure: a keyway is provided on the outer wall of the other end of the adjusting nut 6. In this embodiment, two keyways are provided, and the two keyways are evenly distributed around the axis of the adjusting nut 6. A transmission key 61 is installed in each of the two keyways. Figure 7As shown, one side of the transmission key 61 is stuck in the keyway of the adjusting nut 6, and a fixed pressure plate 62 is provided on the end face of the adjusting nut 6 close to the keyway. The fixed pressure plate 62 is fixed to the adjusting nut 6 by bolts. The fixed pressure plate 62 is tightly attached to the side of the transmission key 61, thereby restricting the transmission key 61 in the keyway.

[0032] In this specific embodiment, the driving device specifically adopts the following structure: the driving device includes a worm gear box 4, which is fixed on a bracket. A worm wheel 42 is arranged inside the worm gear box 4. A keyway is arranged on the inner wall of the worm wheel 42. In this embodiment, there are two keyways, which are evenly distributed around the axis of the worm wheel 42. The keyway of the worm wheel 42 is the same as the keyway of the adjusting nut 6. The other side of the transmission key 61 is stuck in the keyway of the worm wheel 42. The transmission key 61 fixes the worm wheel 42 and the adjusting nut 6 together, and the worm wheel 42 and the adjusting nut 6 can rotate synchronously. A worm 41 cooperating with the worm wheel 42 is also arranged inside the worm gear box 4. One end of the worm 41 is connected to a motor. The motor can drive the worm 41 to rotate, thereby driving the worm wheel 42 and the adjusting nut 6 to rotate synchronously. Figure 6 As shown, a fixed sealing plate 43 is provided at the lower end of the worm gear box 4, and the fixed sealing plate 43 is fixedly connected to the worm gear box 4 by bolts. A sealing groove 431 is provided on the fixed sealing plate 43, and a sealing ring 432 is provided inside the sealing groove 431. The sealing ring 432 in the sealing groove 431 provides a tight sealing effect for the worm gear box 4 to ensure zero leakage of hydraulic oil.

[0033] In this specific embodiment, the adjusting screw 5 specifically adopts the following structure: one end of the adjusting screw 5 is connected to the adjusting nut 6 by a thread, the other end of the adjusting screw 5 is provided with a through hole, a pin 71 is installed in the through hole, locking covers 72 are provided at both ends of the pin 71, the locking covers 72 fix the pin 71 in the through hole, and the connecting rod 7 is sleeved on the pin 71. A cavity 38 is provided inside the adjusting screw 5, and an oil guide column 3 is provided inside the cavity 38.

[0034] In this specific embodiment, the oil guide column 3 specifically adopts the following structure: threads are provided at both ends of the oil guide column 3, and the end of the oil guide column 3 close to the connecting rod 7 is seamlessly sleeved with the piston 2 34, and the outer circumferential surface of the piston 2 34 is sleeved with a sealing guide device 37, and the sealing guide device 37 is tightly attached to the inner wall of the cavity 38. In this embodiment, the sealing guide device 37 adopts a rubber ring, and the sealing guide device 37 ensures that the piston 2 34 seals the hydraulic oil in the cavity 38. The end of the oil guide column 3 close to the connecting rod 7 is also provided with a locking nut 35, and the locking nut 35 is located on the outer side of the piston 2 34. The locking nut 35 fixes the piston 2 34 on the oil guide column 3, and the other end of the oil guide column 3 passes through the adjusting nut 6 and the guide fixing seat 2, and the other end of the oil guide column 3 is installed with a pre-tightening nut 8, such as Figure 8As shown, a pre-tightening groove 81 is provided inside the pre-tightening nut 8, a pre-tightening piston 82 is installed inside the pre-tightening groove 81, and a pre-tightening oil circuit 83 is provided on the pre-tightening nut 8, which is connected to the pre-tightening groove 81. The hydraulic oil flows from the pre-tightening oil circuit 83 into the pre-tightening groove 81, exerts pressure on the pre-tightening piston 82, and tightens the oil guide column 3, the guide fixing seat 2, the adjusting nut 6 and the adjusting screw 5 together. Figure 4 , 5 As shown, a main oil circuit 31 is provided inside the oil guide column 3, and the two ends of the main oil circuit 31 are respectively connected to the first oil circuit 32 and the second oil circuit 33, the first oil circuit 32 is connected to the cavity 38, the second oil circuit 33 is connected to the piston 1 36, and the piston 1 36 is connected to the guide oil circuit 21, that is, the second oil circuit 33 and the guide oil circuit 21 are connected through the piston 1 36.

[0035] Embodiment 2: A method for using the plunger type pre-stressing locking mold adjustment device in Embodiment 1: Before starting the height adjustment, first perform the pre-adjustment pressure relief operation to release the hydraulic oil pressure in the gap between the cavity 38 and the piston 36 and eliminate the locking force. In this process, part of the hydraulic oil flows back to the main oil circuit 31 through the oil guide column 3 and the guide fixing seat 2, and finally flows back to the oil tank. Subsequently, the worm 41 is driven by the motor to rotate, and the worm 41 drives the worm wheel 42 to rotate. Under the action of the transmission key 61, the worm wheel 42 and the adjusting nut 6 realize synchronous rotation. Since the adjusting nut 6 and the adjusting screw 5 are connected by a threaded pair, the rotation of the adjusting nut 6 will drive the adjusting screw 5 to move up and down, and then drive the connecting rod 7 to move up and down, and accurately achieve the required height adjustment. After the height adjustment is completed, the pressurization process begins. The hydraulic oil is injected into the second oil circuit 33 from the guide oil circuit 21, and enters the first oil circuit 32 from the main oil circuit 31. With the injection of the hydraulic oil, the gap between the cavity 38 and the piston 36 is gradually pressurized until the required pressure value is reached. At this point, the process of injecting hydraulic oil stops.

[0036] It can be seen from the above embodiments that the beneficial effect of the present invention is that the pre-tightening nut pre-tightens the oil guide column to ensure its stable position. The first oil circuit on the oil guide column injects hydraulic oil into the cavity, and piston two seals the hydraulic oil in the cavity. The hydraulic oil exerts a downward force on the adjusting screw. The second oil circuit on the oil guide column injects hydraulic oil into piston one. The hydraulic oil fills the gap of piston one and exerts an upward force on the adjusting nut, thereby eliminating the movement gap between the adjusting screw and the adjusting nut. The adjusting screw tends to move downward, while the adjusting nut tends to move upward. In summary, the device significantly improves the uniformity of the force applied by the hydraulic oil through bidirectional pressure, improves the adjustment accuracy, and eliminates the influence of the gap between the components on the bottom dead point of the slider. Under the premise of the protective device, it is ensured that the movement gap between the adjusting screw and the adjusting nut is completely eliminated.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plunger-type pre-pressing, locking and adjusting mold device, comprising a slider (1), characterized in that: The slide block (1) is fixed with a guide fixing seat (2), an adjusting nut (6) is arranged inside the guide fixing seat (2), a piston 1 (36) is arranged between one end of the adjusting nut (6) and the guide fixing seat (2), an adjusting screw (5) is threadedly connected inside the adjusting nut (6), and a connecting rod (7) is hingedly connected to one end of the adjusting screw (5) away from the adjusting nut (6); a cavity (38) is arranged inside the adjusting screw (5), an oil guide column (3) is arranged inside the cavity (38), a piston 2 (34) is fixed to one end of the oil guide column (3), and an outer circumferential surface of the piston 2 (34) is provided with a piston 2 (34). A sealing guide device (37) is sleeved, the sealing guide device (37) is tightly attached to the inner wall of the cavity (38), a pre-tightening nut (8) is fixed to the other end of the oil guide column (3), a first oil path (32) communicating with the cavity (38) is provided on the oil guide column (3), and a second oil path (33) communicating with the piston 1 (36) is also provided on the oil guide column (3); a guide oil path (21) is provided on the guide fixing seat (2), the guide oil path (21) is communicated with the piston 1 (36), a main oil path (31) is provided inside the oil guide column (3), and the two ends of the main oil path (31) are respectively connected to the first The oil circuit (32) and the second oil circuit (33) are connected, and the guide oil circuit (21) and the second oil circuit (33) are connected via a piston (36); a pre-tightening groove (81) is provided inside the pre-tightening nut (8), a pre-tightening piston (82) is installed inside the pre-tightening groove (81), a pre-tightening oil circuit (83) is provided on the pre-tightening nut (8), and the pre-tightening oil circuit (83) is connected to the pre-tightening groove (81); and the worm gear box (4) is also provided with a worm gear (42) inside the worm gear box (4), the inner wall of the worm gear (42) is fixedly connected to the outer wall of the adjusting nut (6), and the inner wall of the worm gear (42) is also fixedly connected to the outer wall of the adjusting nut (6), and the inner wall of the worm gear box (4) is also provided with a pre-tightening piston (82) connected to the worm gear (81). 42) is matched with a worm (41); a fixed sealing plate (43) is provided at the lower end of the worm gear box (4), a sealing groove (431) is provided on the fixed sealing plate (43), and a sealing ring (432) is provided inside the sealing groove (431); a transmission key (61) is provided on the adjusting nut (6), one side of the transmission key (61) is fixedly connected to the outer wall of the adjusting nut (6), and the other side of the transmission key (61) is fixedly connected to the inner wall of the worm gear (42); a fixed pressure plate (62) is fixed to the other end of the adjusting nut (6), and the fixed pressure plate (62) is in close contact with the side of the transmission key (61).

2. A method for using the plunger type pre-loading, locking and mold adjusting device according to claim 1, characterized in that: The following steps are involved: ① Pressure relief before adjustment: the hydraulic oil in the gap between the cavity (38) and the piston (36) is relieved, and part of the hydraulic oil flows back to the oil tank through the oil guide column (3) and the guide fixing seat (2); ② Height adjustment: the worm (41) is driven to rotate to adjust the height of the slider (1); during the height adjustment, the worm (41) is driven to rotate by the motor, the worm (41) drives the worm wheel (42) to rotate, the worm wheel (42) and the adjusting nut (6) rotate synchronously under the action of the transmission key (61), and since the adjusting nut (6) and the adjusting screw (5) are connected by means of a thread pair, the rotation of the adjusting nut (6) drives the adjusting screw (5) to move up and down, thereby driving the slider (1) to move up and down, thereby achieving height adjustment; ③ Pressurization after adjustment: The hydraulic oil is injected from the guide oil passage (21) into the second oil passage (33), and then enters the first oil passage (32) from the main oil passage (31), and the hydraulic oil is re-injected into the gap between the cavity (38) and the piston (36) until the required pressure is reached.

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