Precise adjusting device for lower ejection stroke of hot die forging press

Abstract

The utility model discloses a hot die forging press lower ejection stroke accurate adjusting device which is installed on the opposite side of a hot die forging base lower ejection hydraulic cylinder and located on the outer side of a hot die forging base and comprises a driving mechanism, a box body, a worm, a worm gear, a shaft, a lifting rod and a displacement sensor. The worm and the worm gear are rotationally mounted in the box body, the box body is mounted on the hot die forging base, and the worm is meshed with the worm gear; the lower part of the shaft is in threaded connection with the lifting rod; the displacement sensor is located outside the box body, one end of the displacement sensor is installed on the box body, and the other end is installed on the lifting rod; when the beam moves towards the upper plane of the hot die forging base, the bottom face of the lifting rod makes contact with the beam to limit the stroke of the beam. The lower ejection stroke can be accurately controlled, the failure rate and the manufacturing cost of a traditional hydraulic system are reduced, maintenance is convenient, the stability, the reliability and the maintainability of the whole machine are improved, and the use cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot die forging presses, and particularly relates to a precise adjustment device for the lower ejector stroke of a hot die forging press. Background Art

[0002] A hot die forging press is a commonly used forging equipment at the current stage of industry. After a workpiece is forged, due to the huge impact force, the workpiece will stay in the mold cavity of the mold of the hot die forging press. Therefore, a hot die forging lower ejector device with a corresponding stroke is required to eject and separate the workpiece from the mold cavity. Due to the needs of manufacturers, the same hot die forging press needs to forge different workpieces. Therefore, it is necessary to adjust the lower ejector stroke to adapt to different hot die forging molds.

[0003] The existing lower ejector device of a hot die forging press is as Figure 1 shown. The entire lower ejector device is installed below the hot die forging base 6. The driving force of the lower ejector device is provided by a hydraulic cylinder 1, and then transmitted by a crank plate 3 and an angular lever 4 connected to the head of the hydraulic cylinder, so that the cross beam 2 moves upward to eject three ejector rods 5, completing the ejector process of hot die forging. During the entire ejector process, the stroke of the cross beam is closed-loop controlled by the hydraulic cylinder through a high-frequency response valve and a displacement sensor. This method has a high control accuracy, but has high requirements for the reliability of the hydraulic system and high oil accuracy. Once a failure occurs in the imported high-frequency response valve, it will cause long-term downtime, and the maintenance cost and spare parts cost are relatively high.

[0004] Therefore, based on these problems, it is urgent to develop a lower ejector adjustment mechanism for a hot die forging press to improve the reliability and maintainability of the ejector stroke adjustment, achieve precise adjustment of the ejector position, and reduce the use cost. Summary of the Utility Model

[0005] The utility model provides a precise adjustment device for the lower ejector stroke of a hot die forging press to solve the problems existing in the prior art. This adjustment device can achieve precise control of the lower ejector stroke, reduce the failure rate and manufacturing cost of the traditional hydraulic system, is convenient for maintenance, improves the stability, reliability and maintainability of the whole machine, and reduces the use cost.

[0006] The present utility model is implemented as follows. A precise adjustment device for the lower ejector stroke of a hot forging press is installed on the opposite side of the lower ejector hydraulic cylinder of the hot forging base and is located outside the hot forging base. The adjustment device includes a driving mechanism, a box body, a worm, a worm gear, a shaft, a lifting rod, and a displacement sensor. The output end of the driving mechanism is connected to one end of the worm. The worm and the worm gear are rotatably installed in the box body. The box body is installed on the hot forging base, and the worm and the worm gear are meshed. The upper part of the shaft is provided with spline teeth, and the lower part of the shaft is provided with an external thread. The inner wall of the lifting rod has an internal thread. The upper part of the shaft is spline-connected to the worm gear, and the lower part of the shaft is thread-connected to the lifting rod. The displacement sensor is located outside the box body. One end of the displacement sensor is installed on the box body, and the other end is installed on the lifting rod. When the crossbeam moves towards the upper plane of the hot forging base, the bottom surface of the lifting rod can contact the crossbeam, and the lifting rod restricts the stroke of the crossbeam.

[0007] In the above technical solution, preferably, the adjustment device further includes an upper proximity switch, a lower proximity switch, and a proximity switch contact. The upper proximity switch and the lower proximity switch are respectively used to detect the minimum stroke and the maximum stroke of the lifting rod. The upper proximity switch and the lower proximity switch are both signal-connected to the driving mechanism. The proximity switch contact is installed on the outer side wall of the lifting rod, and the upper proximity switch and the lower proximity switch are respectively installed on the hot forging base corresponding to the proximity switch contact.

[0008] In the above technical solution, preferably, the driving mechanism includes a motor and a coupling. The motor is located on a motor support. The motor support is installed on the hot forging base. The output end of the motor is connected to one end of the coupling, and the other end of the coupling is connected to one end of the worm.

[0009] In the above technical solution, preferably, the shaft is made of 42CrMo material.

[0010] The adjustment device is installed on the hot forging base. The adjustment device outputs power through the motor, drives the worm and worm gear mechanism inside the box body. Below the worm gear is a shaft made of 42CrMo. The upper part of this shaft has spline teeth, and the lower part has an external thread of M100*4, which cooperates with the internal thread inside the lifting rod. A displacement sensor is provided outside the box body, and proximity switches are installed below the motor support.

[0011] Adjust the output power of the motor to drive the rotation of the worm and worm gear mechanism. The worm gear drives the shaft to rotate. Through the thread cooperation, the lifting rod rises and falls to accurately position the mechanical limit position. When the hot forging lower ejector mechanism works, the crossbeam moves towards the upper plane of the hot forging base and is restricted by the lifting rod to change the stroke of the crossbeam. By this method, the purpose of changing the lower ejector stroke is achieved, and the function of accurately adjusting the lower ejector stroke of the hot forging lower ejector mechanism is realized.

[0012] The advantages and positive effects of the present utility model are as follows:

[0013] 1. For the adjustment device of the present utility model, by adding a displacement sensor, the accurate control of the downward ejector stroke can be achieved, with an accuracy of up to 0.1 mm. Compared with the traditional way of controlling the stroke by servo closed-loop, the mechanical adjustment simplifies the hydraulic system, reduces the failure rate of the hydraulic system and the manufacturing cost. The drive motor of the adjustment device is arranged outside the hot die forging base, which is more convenient for maintenance and has a low cost.

[0014] 2. The present utility model combines economy and practicability, improves the stability of the whole machine mechanism, solves the problem of accurately adjusting the downward ejector stroke of the hot die forging press, and achieves the purpose that one press can adjust the corresponding downward ejector stroke according to the replaced product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solutions of the embodiments of the present utility model will be further described in detail below with reference to the drawings. However, it should be understood that these drawings are only designed for the purpose of explanation and therefore do not limit the scope of the present utility model. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0016] Figure 1 is a schematic structural view of the existing downward ejector device of the hot die forging press;

[0017] Figure 2 is a schematic structural view of the accurate adjustment device for the downward ejector stroke of the hot die forging press of the present utility model;

[0018] Figure 3 is a schematic structural view of the worm and worm gear of the adjustment device of the present utility model;

[0019] Figure 4 is an installation schematic view of the accurate adjustment device for the downward ejector stroke of the hot die forging press of the present utility model.

[0020] In the figures: 1. Hydraulic cylinder; 2. Cross beam; 3. Crank plate; 4. Angular lever; 5. Ejector rod; 6. Hot die forging base; 7. Motor; 8. Motor support; 9. Displacement sensor; 10. Box body; 11. Shaft; 12. Lifting rod; 13. Worm; 14. Worm gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the purpose, technical solutions and advantages of the present utility model more clear and understandable, the following embodiments are cited and described in detail in conjunction with the drawings as follows:

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "coupling", "connection", "installation", "fastening" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Please refer to Figures 2 to 4 , an embodiment of the present utility model provides a precise adjustment device for the lower knockout stroke of a hot die forging press. The adjustment device is installed on the opposite side of the lower knockout hydraulic cylinder 1 of the hot die forging base 6 and is located outside the hot die forging base 6. The adjustment device includes a driving mechanism, a box body 10, a worm 13, a worm gear 14, a shaft 11, a lifting rod 12, and a displacement sensor 9. The output end of the driving mechanism is connected to one end of the worm 13. The worm 13 and the worm gear 14 are rotatably installed in the box body 10. The box body 10 is installed on the hot die forging base 6. The worm 13 and the worm gear 14 are meshed; the upper part of the shaft 11 is provided with spline teeth, and the lower part of the shaft 11 is provided with an external thread. The inner wall of the lifting rod 12 has an internal thread; the upper part of the shaft 11 is spline-connected to the worm gear 14, and the lower part of the shaft 11 is thread-connected to the lifting rod 12; the displacement sensor 9 is located outside the box body 10. One end of the displacement sensor 9 is installed on the box body 10, and the other end is installed on the lifting rod 12; when the crossbeam moves towards the upper plane of the hot die forging base 6, the bottom surface of the lifting rod 12 can contact the crossbeam 2, and the lifting rod 12 restricts the stroke of the crossbeam 2.

[0025] As a preferred embodiment, the adjustment device further includes an upper proximity switch, a lower proximity switch, and a proximity switch contact. The upper proximity switch and the lower proximity switch are respectively used to detect the minimum stroke and the maximum stroke of the lifting rod 12. The upper proximity switch and the lower proximity switch are both signal-connected to the driving mechanism; the proximity switch contact is installed on the outer side wall of the lifting rod 12, and the upper proximity switch and the lower proximity switch are respectively installed on the hot die forging base 6 corresponding to the proximity switch contact. The maximum and minimum strokes of the lifting rod 12 can be detected through the upper proximity switch and the lower proximity switch, and the motor signal is controlled to start and stop working.

[0026] As a preferred embodiment, the driving mechanism includes a motor 7 and a coupling. The motor 7 is located on a motor support 8, and the motor support 8 is installed on the hot die forging base 6. The output end of the motor 7 is connected to one end of the coupling, and the other end of the coupling is connected to one end of a worm 13. The motor 7 outputs power, which is convenient for adjustment, and transmits motion and torque through the coupling, improving the performance and reliability of the entire device.

[0027] As a preferred embodiment, the shaft 11 is made of 42CrMo material, ensuring the strength of the shaft 11.

[0028] This adjustment device outputs power through the motor 7. The motor 7 is arranged outside the hot die forging base 6, making maintenance more convenient. The motor 7 drives a worm 13 and worm gear 14 mechanism located inside the box body 10. Below the worm gear 14 is a shaft 11 made of 42CrMo. The upper part of this shaft 11 is a spline tooth, and the lower part is an external thread of M100*4, which cooperates with the internal thread inside the lifting rod 12. A displacement sensor 9 is arranged outside the box body 10, which can accurately control the downward blanking stroke, and the accuracy can reach 0.1 mm. A proximity switch is installed below the motor support 8.

[0029] During operation, the adjustment motor 7 outputs power to drive the rotation of the worm 13 and worm gear 14 mechanism. The worm gear 14 drives the shaft 11 to rotate, and through the thread cooperation, the lifting rod 12 rises and falls to accurately position the mechanical limit position. When the hot die forging downward blanking mechanism works, the cross beam 2 moves towards the upper plane of the hot die forging base 6 and is restricted by the lifting rod 12, changing the stroke of the cross beam 2. By this method, the purpose of changing the downward blanking stroke is achieved, and the function of accurately adjusting the downward blanking stroke of the hot die forging downward blanking mechanism is realized.

[0030] The adjustment device of the present utility model, compared with the traditional way of servo closed-loop control of the stroke, simplifies the hydraulic system by adopting mechanical adjustment, reduces the failure rate and manufacturing cost of the hydraulic system. The present utility model combines economy and practicability, improves the stability of the whole machine mechanism, solves the problem of accurately adjusting the blanking stroke of the hot die forging press, and achieves the purpose that a press can adjust the corresponding blanking stroke according to the replaced product.

[0031] The above is only a preferred embodiment of the present utility model, and it does not impose any form of limitation on the present utility model. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model all fall within the scope of the technical solution of the present utility model.

Claims

1. A precise adjustment device for the lower ejector stroke of a hot die forging press, which is installed on the opposite side of the lower ejector hydraulic cylinder of the hot die forging base and is located outside the hot die forging base, characterized in that: The adjustment device includes a driving mechanism, a housing, a worm, a worm wheel, a shaft, a lifting rod, and a displacement sensor. The output end of the driving mechanism is connected to one end of the worm, and the worm and the worm wheel are rotatably installed in the housing. The housing is installed on a hot die forging base, and the worm and the worm wheel are meshed; the upper part of the shaft is provided with spline teeth, the lower part of the shaft is provided with external threads, and the inner wall of the lifting rod has internal threads; the upper part of the shaft is spline-connected with the worm wheel, and the lower part of the shaft is threadedly connected with the lifting rod; the displacement sensor is located outside the housing, one end of the displacement sensor is installed on the housing, and the other end is installed on the lifting rod; when the crossbeam moves toward the plane on the hot die forging base, the bottom surface of the lifting rod contacts the crossbeam, and the lifting rod limits the stroke of the crossbeam.

2. The device for accurately adjusting the lower ejector stroke of a hot die forging press according to claim 1, characterized in that: The adjustment device also includes an upper proximity switch, a lower proximity switch and a proximity switch contact. The upper proximity switch and the lower proximity switch are respectively used to detect the minimum stroke and the maximum stroke of the lifting rod. The upper proximity switch and the lower proximity switch are both connected to the drive mechanism signal; the proximity switch contact is installed on the outer side wall of the lifting rod, and the upper proximity switch and the lower proximity switch are respectively installed on the hot forging base corresponding to the proximity switch contact.

3. The device for accurately adjusting the lower ejector stroke of a hot die forging press according to claim 1, characterized in that: The driving mechanism comprises a motor and a coupling. The motor is located on a motor support, and the motor support is mounted on a hot die forging base. The output end of the motor is connected to one end of the coupling, and the other end of the coupling is connected to one end of the worm.

4. The device for accurately adjusting the lower ejector stroke of a hot die forging press according to claim 1, characterized in that: The shaft is made of 42CrMo material.

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