Closed type double-point multi-connecting-rod servo press

Abstract

The invention relates to a closed type double-point multi-connecting-rod servo press which comprises a press body, a transmission box, a lead screw, a lower bearing, a lower supporting sleeve, a nut and a driving sliding block. A servo motor is arranged at the upper end of the transmission box; the upper end of the screw rod is connected with the servo motor through a cylindrical pin; an upper lubricating end cover is arranged at the upper end of the driving sliding block, a lower lubricating end cover is arranged at the lower end of the driving sliding block, sealing felt is arranged at the upper end of the upper lubricating end cover, and the driving sliding block, the upper lubricating end cover and the sealing felt are matched to form an upper lubricating cavity. The lower lubricating end cover is connected with a telescopic sleeve arranged on the bottom plate, the driving sliding block, the lower lubricating end cover, the telescopic sleeve and the bottom plate are matched to form a lower lubricating cavity, a circulating oil way is arranged between the upper lubricating cavity and the lower lubricating cavity, lubricating oil in the lower lubricating cavity is conveyed into the upper lubricating cavity through the circulating oil way, and the circulating oil way passes through the lower bearing and is communicated with the lower lubricating cavity. Lubricating oil in the circulating oil way lubricates the lower bearing. The invention has the advantages of reasonable structural design, closed lubrication, good lubrication effect, high transmission precision and the like.

Description

Technical fields:

[0001] This invention relates to the field of servo press technology, specifically to a closed-type dual-point multi-link servo press. Background technology:

[0002] Closed-type double-point presses are widely used in the stamping and forming of sheet metal parts and are an important type of large-scale processing equipment in mechanical equipment. The main structure of existing closed-type double-point presses includes a driver, which is connected to a lifting mechanism. Multi-link mechanisms are connected to both sides of the lifting mechanism, and the two multi-link mechanisms are connected to a slider. For specific structures, refer to the following Chinese patents: a servo edge-sealing press with a lead screw-driven double-elbow mechanism (Publication No.: CN 110355249 A) ​​and an easy-to-maintain servo edge-sealing press (Publication No.: 113510953A). The lifting mechanism mainly uses a lead screw and nut drive, while the driver is preferably a motor.

[0003] Although existing closed-loop two-point presses meet stamping requirements to a certain extent, some shortcomings still exist in practical applications. For example, the connection between the output shaft of the driver and the lead screw is mainly a keyed connection or a splined connection (e.g., ...). Figure 13 As shown in the image, this connection method has transmission backlash, which prevents high-precision transmission and affects the running accuracy of the slider. Although the impact can be mitigated through trial runs and error compensation, long-term operation leads to wear, temperature rise, and lubrication issues, causing uncontrollable fluctuations in the transmission backlash within a certain range. The existence of transmission backlash limits the development of closed-loop two-point presses towards high precision. For example, existing lead screw and nut drives generally use open lubrication, meaning the lubricating oil passes through the lead screw nut (e.g., ...). Figure 14 Lubrication is achieved through the internal lubrication channels on the screw (as shown). The use of open lubrication is primarily due to limitations in installation space, interference from other components (such as multi-link mechanisms), and the lifting and lowering movement of the lead screw and nut. Open lubrication suffers from problems such as easy dust ingress, generally poor lubrication effect, and poor precision in the lead screw and nut fit. This is especially true in closed-type two-point presses, where the lead screw and nut drive is a core component. It not only needs to bear weight, but its transmission accuracy directly affects the running accuracy of the slide block, making existing open lubrication methods insufficient. Therefore, it is necessary to optimize and improve the existing closed-type two-point press to enhance its running accuracy.

[0004] It should be noted that the above content falls within the inventor's technical knowledge and does not necessarily constitute prior art. Summary of the Invention:

[0005] The purpose of this invention is to solve the problems existing in the prior art and provide a closed-loop dual-point multi-link servo press, which has the advantages of reasonable structural design, closed-loop lubrication, good lubrication effect, and high transmission accuracy.

[0006] The present invention achieves the above objectives by adopting the following technical solutions:

[0007] A closed-type double-point multi-link servo press includes a machine body, a transmission box on the machine body, a lead screw that rotates vertically on the transmission box, the lower end of the lead screw being rotatably mounted on a lower support sleeve via a lower bearing, the lower support sleeve being mounted on the bottom plate of the transmission box, a lead screw nut on the lead screw, a drive slider on the lead screw nut, and multi-link mechanisms on both sides of the drive slider and the machine body respectively, with the two multi-link mechanisms respectively connected to the slider;

[0008] The upper end of the transmission box is equipped with a servo motor, and the upper end of the lead screw is connected to the servo motor through a cylindrical pin.

[0009] The drive slider has an upper lubrication end cap at its upper end and a lower lubrication end cap at its lower end. The upper lubrication end cap has a sealing felt at its upper end. The drive slider, the upper lubrication end cap, and the sealing felt cooperate to form an upper lubrication cavity. The lower lubrication end cap is connected to a telescopic sleeve set on the base plate. The drive slider, the lower lubrication end cap, the telescopic sleeve, and the base plate cooperate to form a lower lubrication cavity. A circulating oil passage is provided between the upper and lower lubrication cavities. The circulating oil passage transports the lubricating oil in the lower lubrication cavity to the upper lubrication cavity. The circulating oil passage also passes through the lower bearing, and the lubricating oil in the circulating oil passage lubricates the lower bearing.

[0010] The output shaft of the servo motor is provided with a mounting hole for inserting a lead screw. The inner wall of the mounting hole is provided with a plurality of semi-positioning holes A evenly spaced along the circumferential direction. The upper side wall of the lead screw is provided with a number of semi-positioning holes B evenly spaced along the circumferential direction, equal to the number of semi-positioning holes A. The semi-positioning holes A and B cooperate to form a positioning hole. The positioning hole is provided with a cylindrical pin and is fitted with an interference fit.

[0011] The inner wall of the mounting hole is provided with four semi-positioning holes A evenly spaced along the circumferential direction, and the corresponding upper end side wall of the lead screw is provided with four semi-positioning holes B evenly spaced along the circumferential direction.

[0012] The lower support sleeve has an upper cover at its upper end and a lower cover at its lower end. The circulating oil circuit includes an oil passage on the upper cover of the lower support. The lower cover of the lower support has a lower oil port, and the side wall of the upper lubrication end cover has an upper oil port. The lubricating oil in the lower lubrication chamber enters the lower bearing through the oil passage, passes through the lower bearing, and then enters the lower oil port. The lower oil port has a lower connector, and the upper oil port has an upper connector. The lower connector has a ball valve, and the ball valve is connected to the circulating oil pump through the lower oil pipe. The circulating oil pump is connected to the upper connector through the upper oil pipe.

[0013] The upper lubrication end cover is equipped with a liquid level sensor, which is connected to a controller, and the controller is connected to a circulating oil pump.

[0014] The transmission box includes an upper seat with a hollow design in the middle. A motor seat is provided at the upper end of the upper seat, and a servo motor is vertically provided on the motor seat. Two side plates are spaced apart at the lower end of the upper seat, and a base plate is connected to the lower end of the two side plates.

[0015] The drive slider is provided with two guide protrusions at the front and rear, and drive protrusions on the left and right. The guide protrusions are provided with two vertically arranged guide sleeve mounting holes at intervals. The guide sleeves are provided in the guide sleeve mounting holes. The guide sleeves are slidably mounted on the guide post. The upper end of the guide post is mounted on the motor base, and the lower end is mounted on the base plate.

[0016] The multi-link mechanism includes two long fulcrum plates longitudinally spaced on the machine body, each long fulcrum plate being equipped with a short fulcrum plate. An upper connecting rod pin seat is provided between the long and short fulcrum plates, and an upper connecting rod pin is provided between the two upper connecting rod pin seats. An upper connecting rod is rotatably mounted on the upper connecting rod pin, and the other end of the upper connecting rod is rotatably mounted on an intermediate pin. Two lower connecting rods are rotatably mounted on the intermediate pin at intervals, and the lower ends of the two lower connecting rods are rotatably mounted on the lower connecting rod pin. The lower connecting rod pin is mounted on a slider. A drive mounting hole is longitudinally provided on the drive protrusion, and a drive rod pin is rotatably mounted on the drive mounting hole. Drive rods are respectively mounted on both sides of the drive rod pin via flat keys, and the other end of the drive rod is mounted on the intermediate pin via a flat key.

[0017] The upper connecting rod pin has an upper connecting rod pin end cap at one end, which is installed on the upper connecting rod pin seat by multiple bolts. One end of the upper connecting rod is rotatably mounted on the upper connecting rod pin by two upper connecting rod upper bearings, and the other end is rotatably mounted on the intermediate pin by two upper connecting rod lower bearings. One end of the lower connecting rod is rotatably mounted on the intermediate pin by a lower connecting rod upper bearing, and the other end is rotatably mounted on the lower connecting rod pin by a lower connecting rod lower bearing. The drive rod pin is rotatably mounted on the drive mounting hole by a drive rod pin bearing. Both ends of the drive rod pin are provided with drive rod pin end caps, and both ends of the intermediate pin are provided with intermediate pin end caps.

[0018] The present invention, employing the above-described structure, can bring the following beneficial effects:

[0019] (1) The servo motor and lead screw are directly connected by cylindrical pin transmission. Compared with the existing key transmission and spline transmission, this can effectively eliminate transmission gap and significantly improve transmission accuracy. (2) The lead screw, lead nut transmission and lower bearing are lubricated by a closed lubrication method. This not only has a good dustproof effect, but also a better lubrication effect. In particular, it can form a long-term stable lubricating oil film between the lead screw and lead nut. The lubricating oil film can effectively reduce the fit gap between the lead screw and lead nut and improve the fit accuracy, thereby improving the transmission accuracy. Since the lead screw is set to rotate vertically, the lubrication of the lower bearing is particularly important. By using closed lubrication, the long-term stable lubrication effect can be guaranteed, which helps to improve the rotation accuracy of the lead screw and further improve the transmission accuracy. By using cylindrical pin transmission and closed lubrication method to lubricate the lead screw, lead nut transmission and lower bearing, only the cooperation of the three can truly and significantly improve the transmission accuracy of the closed double-point multi-link servo press. Attached image description:

[0020] Figure 1 This is a top view of the closed-type dual-point multi-link servo press of the present invention.

[0021] Figure 2 for Figure 1 Sectional view along line AA in the middle;

[0022] Figure 3 for Figure 2 Enlarged view of part A in the image;

[0023] Figure 4 This is a perspective view of the closed-type dual-point multi-link servo press of the present invention;

[0024] Figure 5 This is an exploded view of the connection between the servo motor and the lead screw in this invention;

[0025] Figure 6 This is a schematic diagram of the structure of the driving slider of the present invention;

[0026] Figure 7 This is a schematic diagram of the transmission box of the present invention;

[0027] Figure 8 This is a bottom view of the transmission box structure of the present invention;

[0028] Figure 9 This is a schematic diagram of the multi-link mechanism of the present invention;

[0029] Figure 10 This is an exploded view of the multi-link mechanism of the present invention;

[0030] Figure 11 This is a schematic diagram of the structure of the fuselage of the present invention;

[0031] Figure 12This is a structural schematic diagram of the fuselage of the present invention from another perspective;

[0032] Figure 13 A schematic diagram of an existing lead screw using spline drive;

[0033] Figure 14 A schematic diagram of an existing nut lubrication system using an open lubrication channel;

[0034] In the diagram, 1. Body, 2. Transmission box, 201. Upper seat, 202. Motor seat, 203. Side plate, 204. Base plate, 3. Lead screw, 4. Lower bearing, 5. Lower support sleeve, 6. Lead nut, 7. Drive slider, 8. Multi-link mechanism, 801. Long fulcrum plate, 802. Short fulcrum plate, 803. Upper connecting rod pin seat, 804. Upper connecting rod pin, 805. Upper connecting rod, 806. Intermediate pin, 807. Lower connecting rod, 808. Lower connecting rod pin. 809. Drive mounting hole; 810. Drive rod pin; 811. Flat key; 812. Drive rod; 813. Upper connecting rod pin end cap; 814. Bolt; 815. Upper connecting rod upper bearing; 816. Upper connecting rod lower bearing; 817. Lower connecting rod upper bearing; 818. Lower connecting rod lower bearing; 819. Drive rod pin bearing; 820. Drive rod pin end cap; 821. Intermediate pin end cap; 9. Slider; 10. Servo motor; 11. Cylindrical pin; 12. Upper lubrication end cap. 13. Lower lubrication end cap; 14. Sealing felt; 15. Upper lubrication chamber; 16. Telescopic sleeve; 17. Lower lubrication chamber; 18. Circulating oil circuit; 1801. Oil passage; 1802. Lower oil port; 1803. Upper oil port; 1804. Lower connector; 1805. Upper connector; 1806. Ball valve; 1807. Lower oil pipe; 1808. Circulating oil pump; 1809. Upper oil pipe; 1810. Liquid level sensor; 1811. Controller; 19. 20. Output shaft, 21. Mounting hole, 22. Semi-positioning hole A, 23. Semi-positioning hole B, 24. Positioning hole, 25. Lower support upper end cover, 26. Lower support lower end cover, 27. Guide protrusion, 28. Drive protrusion, 29. Guide sleeve mounting hole, 30. Guide sleeve, 31. Guide post, 32. Spline drive, 33. Upper support sleeve, 34. Upper support upper end cover, 35. Pressure cover, 36. Worktable, 37. Open lubrication channel. Detailed implementation method:

[0035] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0037] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] like Figure 1-12 As shown, a closed-type double-point multi-link servo press includes a machine body 1, a transmission box 2 on the machine body 1, a lead screw 3 vertically rotatably mounted on the transmission box 2, the lower end of the lead screw 3 being rotatably mounted on a lower support sleeve 5 via a lower bearing 4, and the upper end of the lead screw 3 being rotatably mounted via an upper support sleeve 32, a bearing, an upper support upper end cover 33, and an upper support lower end cover 34. The upper support sleeve 32 is mounted on a motor base 202, and the lower support sleeve 5 is mounted on a base plate 204 of the transmission box 2. The lead screw 3 is provided with a lead screw nut 6, and the lead screw nut 6 is provided with a drive slider 7. Multi-link mechanisms 8 are respectively provided between the two sides of the drive slider 7 and the machine body 1. The two multi-link mechanisms 8 are respectively connected to sliders 9. Here, sliders 9 are existing press technology. Typically, the machine body is provided with a worktable 36, and sliders 9 cooperate with the worktable 36 to process workpieces.

[0040] The upper end of the transmission box 2 is equipped with a servo motor 10, and the upper end of the lead screw 3 is connected to the servo motor 10 through a cylindrical pin 11.

[0041] The drive slider 7 has an upper lubrication end cover 12 at its upper end and a lower lubrication end cover 13 at its lower end. The upper lubrication end cover 12 has a sealing felt 14 at its upper end. The sealing felt 14 is preferably installed on the upper lubrication end cover 12 by a pressure cap 35 and bolts. The drive slider 7, the upper lubrication end cover 12, and the sealing felt 14 cooperate to form an upper lubrication cavity 15. The lower lubrication end cover 13 is connected to a telescopic sleeve 16 provided on the base plate 204. The drive slider 7, the lower lubrication end cover 13, the telescopic sleeve 16, and the base plate 204 cooperate to form a lower lubrication cavity 17. A circulating oil passage 18 is provided between the upper lubrication cavity 15 and the lower lubrication cavity 17. The circulating oil passage 18 transports the lubricating oil in the lower lubrication cavity 17 to the upper lubrication cavity 15. The circulating oil passage 18 also passes through the lower bearing 4, and the lubricating oil in the circulating oil passage 18 lubricates the lower bearing 4. The servo motor 10 and the lead screw 3 are directly connected by a cylindrical pin 11 drive. Compared with the existing key drive or spline drive 31, this effectively eliminates transmission backlash and significantly improves transmission accuracy. Compared with the existing open lubrication method (mainly through an open lubrication channel 37 designed on the lead screw nut), the closed lubrication method for lubricating the lead screw 3, lead screw nut 6, and lower bearing 4 not only has a good dustproof effect but also a better lubrication effect. In particular, it can form a long-term stable lubricating oil film between the lead screw 3 and lead screw nut 6, which can effectively reduce the fit clearance between the lead screw 3 and lead screw nut 6, improve fit accuracy, and thus improve transmission accuracy. Since the lead screw 3 is vertically rotating, the lubrication of the lower bearing 4 is particularly important. The closed lubrication method ensures a long-term stable lubrication effect, which helps to improve the rotational accuracy of the lead screw 3, thereby further improving the transmission accuracy of the lead screw and lead screw nut. By using cylindrical pin drive and closed lubrication method for lubricating the lead screw 3, lead screw nut 6, and lower bearing 4, the three work together to truly and significantly improve the transmission accuracy of the closed double-point multi-link servo press.

[0042] The output shaft 19 of the servo motor 10 is provided with a mounting hole 20 for inserting and assembling the lead screw 3. Multiple semi-positioning holes A21 are evenly spaced along the circumferential direction on the inner wall of the mounting hole 20. Correspondingly, the upper side wall of the lead screw 3 is evenly spaced along the circumferential direction with the same number of semi-positioning holes B22 as the semi-positioning holes A21. The semi-positioning holes A21 and B22 cooperate to form a positioning hole 23. A cylindrical pin 11 is provided on the positioning hole 23 with an interference fit. This provides a specific structure where the output shaft 19 and the lead screw 3 are directly connected by a cylindrical pin 11, achieving backlash-free transmission and offering advantages such as high transmission accuracy and stable, reliable transmission.

[0043] The inner wall of the mounting hole 20 is provided with four semi-positioning holes A21 evenly spaced along the circumferential direction, and the corresponding upper side wall of the lead screw 3 is provided with four semi-positioning holes B22 evenly spaced along the circumferential direction. Preferably, four cylindrical pins 11 are used to realize the transmission connection between the output shaft 19 and the lead screw 3, which has the advantages of gapless transmission connection and stable and reliable connection.

[0044] The lower support sleeve 5 has an upper cover 24 at its upper end and a lower cover 25 at its lower end. The circulating oil circuit 18 includes an oil passage 1801 on the upper cover 25. The lower cover 25 has a lower oil port 1802, and the upper lubrication end cover 12 has an upper oil port 1803 on its side wall. The lubricating oil in the lower lubrication cavity 17 enters the lower bearing 4 through the oil passage 1801, and then enters the lower oil port 1802 after passing through the lower bearing 4. The lower oil port 1802 has a lower connecting... The head 1804 has an upper connector 1805 on the upper oil port 1803 and a ball valve 1806 on the lower connector 1804. The ball valve 1806 is connected to the circulating oil pump 1808 through the lower oil pipe 1807. In practical applications, the circulating oil pump 1808 can be mounted on the base plate 204 with a bracket. Sufficient length is reserved for the upper oil pipe 1809 and the lower oil pipe 1807 to accommodate lifting. The circulating oil pump 1808 is connected to the upper connector 1805 through the upper oil pipe 1809. The specific structure of the circulating oil circuit 18 is given. It can not only realize closed lubrication of the lower bearing 4, but also transport the lubricating oil in the lower lubrication chamber 17 to the upper lubrication chamber 15, ensuring that there is always sufficient lubricating oil in the upper lubrication chamber 15. The lubricating oil in the upper lubrication chamber 15 can form a lubricating oil film on the surface of the lead screw 3 and the lead nut 6 through the gap between the lead screw 3 and the lead nut 6 and the relative movement. The circulating oil circuit 18 can achieve continuous and stable formation of the lubricating oil film, thereby improving the transmission accuracy.

[0045] A liquid level sensor 1810 is provided on the upper lubrication end cover 12. The liquid level sensor 1810 is connected to a controller 1811, which is connected to a circulating oil pump 1808. The controller 1811 can be the original controller of the press or a new controller can be configured separately. When the lubricating oil in the upper lubrication chamber 15 is lower than the set liquid level line (i.e., the position detected by the liquid level sensor 1810), the controller 1811 controls the circulating oil pump 1808 to start working and transport the lubricating oil in the lower lubrication chamber 17 to the upper lubrication chamber 15. Usually, the working time of the circulating oil pump 1808 is set to ensure that the lubricating oil exceeds the liquid level line but does not exceed the maximum set value of the upper lubrication chamber 15 (of course, a detection can also be set at the maximum set value, and the circulating oil pump 1808 stops working after the liquid level reaches the maximum set value to ensure the liquid level is safe), thereby ensuring that the lubricating oil in the upper lubrication chamber 15 can meet the needs of use for a period of time.

[0046] The transmission box 2 includes an upper base 201 with a hollowed-out central section. A motor mount 202 is located at the upper end of the upper base 201, and a servo motor 10 is vertically mounted on the motor mount 202. Two side plates 203 are spaced apart at the lower end of the upper base 201, and a base plate 204 is connected to the lower ends of the two side plates 203. The specific structure of the transmission box 2 is given; this structure not only facilitates connection to the machine body 1 but also features a compact design, integrating the transmission components onto the transmission box 2.

[0047] The drive slider 7 has two guide protrusions 26 at the front and rear, and drive protrusions 27 on the left and right. Each guide protrusion 26 has two vertically spaced guide sleeve mounting holes 28, and a guide sleeve 29 is mounted on each guide sleeve mounting hole 28. The guide sleeve 29 is slidably mounted on a guide post 30. The upper end of the guide post 30 is mounted on a motor base 202, and the lower end is mounted on a base plate 204. Guide protrusions 26 and drive protrusions 27 are designed to support the vertical movement of the drive slider 7 and the driving of the multi-link mechanism 8. They are designed as a single, integral unit with very high structural strength. The guide protrusions 26, in conjunction with the guide sleeves 29 and guide posts 30 on the transmission box 2, provide precise guidance and support for the vertical movement, thus providing a foundation for the strength and precision required for the drive protrusions 27 to drive the multi-link mechanism 8.

[0048] The multi-link mechanism 8 includes two long fulcrum plates 801 longitudinally spaced on the body 1, each long fulcrum plate 801 being equipped with a short fulcrum plate 802. An upper link pin seat 803 is provided between the long fulcrum plate 801 and the short fulcrum plate 802, and an upper link pin 804 is provided between the two upper link pin seats 803. An upper link 805 is rotatably mounted on the upper link pin 804, and the other end of the upper link 805 is rotatably mounted on an intermediate pin 806. The intermediate pin 806 is... Two lower connecting rods 807 are rotatably mounted on a lower connecting rod pin 808 at their lower ends. The lower connecting rod pin 808 is mounted on the slider 9. A drive mounting hole 809 is longitudinally provided on the drive protrusion 207. A drive rod pin 810 is rotatably mounted on the drive mounting hole 809. Drive rods 812 are mounted on both sides of the drive rod pin 810 via flat keys 811. The other end of the drive rod 812 is mounted on the intermediate pin 806 via a flat key 811. The specific structure of the multi-link mechanism 8 is given. In addition to satisfying basic spatial motion, the multi-link mechanism 8 also needs to improve the connection strength with the body 1 and the drive slider 7. These two connection points are the core support points, which need to withstand not only the weight of the slider 9 but also impacts. To address this, two sets of support points, consisting of a long fulcrum plate 801 and a short fulcrum plate 802, are designed on the fuselage 1. Linkage pin seats 803 are installed at each of the two support points, and link pins 804 are installed on the two upper link pin seats 803. This strengthens the overall structure and enhances its impact resistance. Furthermore, the drive protrusion 27 and guide protrusion 26 are integrally formed with the drive slider 7, and the guide support of the guide protrusion 26 significantly improves the impact resistance of the drive protrusion 27, resulting in high overall structural strength.

[0049] The upper connecting rod pin 804 has an upper connecting rod pin end cap 813 at one end, which is mounted on the upper connecting rod pin seat 803 by multiple bolts 814. The upper connecting rod 805 is rotatably mounted on the upper connecting rod pin 804 at one end by two upper connecting rod upper covers 815, and rotatably mounted on the intermediate pin 806 at the other end by two upper connecting rod lower covers 816. The lower connecting rod 807 is rotatably mounted on the intermediate pin 806 at one end by lower connecting rod upper covers 817, and rotatably mounted on the lower connecting rod pin 808 at the other end by lower connecting rod lower covers 818. The drive rod pin 810 is rotatably mounted on the drive mounting hole 809 by drive rod pin covers 819. The drive rod pin 810 has drive rod pin end caps 820 at both ends, and the intermediate pin 806 has intermediate pin end caps 821 at both ends.

[0050] The lubrication method of the closed-type dual-point multi-link servo press described in this application is as follows:

[0051] The upper lubrication chamber 15 and the lower lubrication chamber 17 form a semi-enclosed chamber. Lubricating oil is injected into both chambers. The lead screw nut 3 moves up and down along the lead screw 6 as the lead screw 6 rotates (driven by the servo motor 10), simultaneously moving the telescopic sleeve 16 up and down. The lubricating oil in the upper lubrication chamber 15 evenly coats the surfaces of the lead screw 3 and lead screw nut 6 through the gap and relative movement, forming a lubricating oil film. Compared to open lubrication, this provides better dust prevention and lubrication, effectively reducing the clearance between the lead screw 3 and lead screw nut 6, improving fit accuracy, and thus improving transmission accuracy. The lubricating oil in the lower lubrication chamber 17 enters the lower bearing 4 through the oil passage 1801, lubricating the lower bearing 4. When the lubricating oil in the upper lubrication chamber 15 is lower than the set liquid level line (which can be detected by the liquid level sensor 1810), the circulating oil pump 1808 starts to work and transports the lubricating oil in the lower lubrication chamber 17 to the upper lubrication chamber 15, thereby ensuring that a continuous and stable lubricating oil film is formed on the surface of the lead screw 3 and the lead nut 6.

[0052] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0053] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A closed-type dual-point multi-link servo press, comprising a machine body, a transmission box on the machine body, a lead screw vertically rotatably mounted on the transmission box, the lower end of the lead screw being rotatably mounted on a lower support sleeve via a lower bearing, the lower support sleeve being mounted on the base plate of the transmission box, a lead screw nut on the lead screw, a drive slider on the lead nut, and multi-link mechanisms respectively provided between the drive slider and the machine body on both sides, the two multi-link mechanisms being respectively connected to the slider, characterized in that... The upper end of the transmission box is equipped with a servo motor, and the upper end of the lead screw is connected to the servo motor through a cylindrical pin. The drive slider has an upper lubrication end cap at its upper end and a lower lubrication end cap at its lower end. The upper lubrication end cap has a sealing felt at its upper end. The drive slider, the upper lubrication end cap, and the sealing felt cooperate to form an upper lubrication cavity. The lower lubrication end cap is connected to a telescopic sleeve set on the base plate. The drive slider, the lower lubrication end cap, the telescopic sleeve, and the base plate cooperate to form a lower lubrication cavity. A circulating oil passage is provided between the upper and lower lubrication cavities. The circulating oil passage transports the lubricating oil in the lower lubrication cavity to the upper lubrication cavity. The circulating oil passage also passes through the lower bearing, and the lubricating oil in the circulating oil passage lubricates the lower bearing.

2. The closed-type dual-point multi-link servo press according to claim 1, characterized in that, The output shaft of the servo motor is provided with a mounting hole for inserting a lead screw. The inner wall of the mounting hole is provided with a plurality of semi-positioning holes A evenly spaced along the circumferential direction. The upper side wall of the lead screw is provided with a number of semi-positioning holes B evenly spaced along the circumferential direction, equal to the number of semi-positioning holes A. The semi-positioning holes A and B cooperate to form a positioning hole. The positioning hole is provided with a cylindrical pin and is fitted with an interference fit.

3. The closed-type dual-point multi-link servo press according to claim 2, characterized in that, The inner wall of the mounting hole is provided with four semi-positioning holes A evenly spaced along the circumferential direction, and the corresponding upper end side wall of the lead screw is provided with four semi-positioning holes B evenly spaced along the circumferential direction.

4. The closed-type dual-point multi-link servo press according to claim 1, 2, or 3, characterized in that, The lower support sleeve has an upper cover at its upper end and a lower cover at its lower end. The circulating oil circuit includes an oil passage on the upper cover of the lower support. The lower cover of the lower support has a lower oil port, and the side wall of the upper lubrication end cover has an upper oil port. The lubricating oil in the lower lubrication chamber enters the lower bearing through the oil passage, passes through the lower bearing, and then enters the lower oil port. The lower oil port has a lower connector, and the upper oil port has an upper connector. The lower connector has a ball valve, and the ball valve is connected to the circulating oil pump through the lower oil pipe. The circulating oil pump is connected to the upper connector through the upper oil pipe.

5. The closed-type dual-point multi-link servo press according to claim 4, characterized in that, The upper lubrication end cover is equipped with a liquid level sensor, which is connected to a controller, and the controller is connected to a circulating oil pump.

6. The closed-type dual-point multi-link servo press according to claim 5, characterized in that, The transmission box includes an upper seat with a hollow design in the middle. A motor seat is provided at the upper end of the upper seat, and a servo motor is vertically provided on the motor seat. Two side plates are spaced apart at the lower end of the upper seat, and a base plate is connected to the lower end of the two side plates.

7. The closed-type dual-point multi-link servo press according to claim 6, characterized in that, The drive slider is provided with two guide protrusions at the front and rear, and drive protrusions on the left and right. The guide protrusions are provided with two vertically arranged guide sleeve mounting holes at intervals. The guide sleeves are provided in the guide sleeve mounting holes. The guide sleeves are slidably mounted on the guide post. The upper end of the guide post is mounted on the motor base, and the lower end is mounted on the base plate.

8. The closed-loop dual-point multi-link servo press according to claim 7, characterized in that, The multi-link mechanism includes two long fulcrum plates longitudinally spaced on the machine body, each long fulcrum plate being equipped with a short fulcrum plate. An upper connecting rod pin seat is provided between the long and short fulcrum plates, and an upper connecting rod pin is provided between the two upper connecting rod pin seats. An upper connecting rod is rotatably mounted on the upper connecting rod pin, and the other end of the upper connecting rod is rotatably mounted on an intermediate pin. Two lower connecting rods are rotatably mounted on the intermediate pin at intervals, and the lower ends of the two lower connecting rods are rotatably mounted on the lower connecting rod pin. The lower connecting rod pin is mounted on a slider. A drive mounting hole is longitudinally provided on the drive protrusion, and a drive rod pin is rotatably mounted on the drive mounting hole. Drive rods are respectively mounted on both sides of the drive rod pin via flat keys, and the other end of the drive rod is mounted on the intermediate pin via a flat key.

9. The closed-type dual-point multi-link servo press according to claim 8, characterized in that, The upper connecting rod pin has an upper connecting rod pin end cap at one end, which is installed on the upper connecting rod pin seat by multiple bolts. One end of the upper connecting rod is rotatably mounted on the upper connecting rod pin by two upper connecting rod upper bearings, and the other end is rotatably mounted on the intermediate pin by two upper connecting rod lower bearings. One end of the lower connecting rod is rotatably mounted on the intermediate pin by a lower connecting rod upper bearing, and the other end is rotatably mounted on the lower connecting rod pin by a lower connecting rod lower bearing. The drive rod pin is rotatably mounted on the drive mounting hole by a drive rod pin bearing. Both ends of the drive rod pin are provided with drive rod pin end caps, and both ends of the intermediate pin are provided with intermediate pin end caps.

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