Servo stamping equipment

Abstract

The utility model discloses servo stamping equipment which comprises a workbench, a lower die assembly arranged on the workbench and an installation frame erected above the lower die assembly, a lifting seat movably arranged on the installation frame in a lifting mode, an upper die assembly matched with the lower die assembly is connected to the lifting seat, and a crank connecting rod mechanism connected with the lifting seat is arranged on the installation frame. The crank connecting rod mechanism comprises a crankshaft rotationally arranged on the mounting frame and a connecting arm connected between the crankshaft and the lifting seat, the crankshaft is connected with a servo motor for driving the crankshaft to rotate, an encoder is arranged on a rotating shaft of the servo motor, and the encoder is electrically connected with a control module for controlling the rotating speed of the servo motor; the upper die assembly can be driven to be quickly assembled with the lower die assembly before the upper die assembly makes contact with a workpiece, and when the upper die assembly makes contact with the workpiece, the upper die assembly can be driven to slowly get close to the lower die assembly, rotation of the servo motor is suspended so as to prolong the assembling time, the stamping speed can be controlled in a segmented mode, and the stamping action can be freely adjusted according to the machining requirement so as to achieve the corresponding forming quality.

Description

Technical Field

[0001] This utility model relates to a servo stamping device. Background Technology

[0002] Traditional stamping equipment uses a motor to drive a crank, which in turn moves a slider up and down via a connecting rod. The slider is connected to the upper die of the stamping mold, and a lower die matching the upper die is mounted on the worktable. The motor drives the crank-connecting rod-slider mechanism to reciprocate up and down, causing the upper die to continuously close and separate from the lower die. The contact time between the upper and lower dies and the stamping speed are determined by the motor speed. High-speed operation of the motor enables rapid stamping production.

[0003] However, for some workpieces with high resilience, if the mold closing time between the upper and lower dies is too short, the workpiece will recover part of its deformation after stamping, resulting in deviations in the dimensional accuracy of the workpiece. If the motor speed is reduced to extend the mold closing time, the stamping action will be very slow, and the production efficiency will be severely reduced.

[0004] In addition, during the high-speed operation of the stamping equipment, the assembly points of the crank, connecting rod, and slide are prone to wear and heat. Therefore, in the existing technology, it is necessary to add lubricating oil to the relatively moving parts between the components regularly. If the lubricating oil is not added in time, abnormal wear will occur. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the purpose of this invention is to provide a servo stamping device that allows for segmented control of the stamping rate and adjustment of the mold closing time, thereby enabling free adjustment of the stamping action according to processing needs to achieve the corresponding forming quality.

[0006] A servo stamping device according to an embodiment of the present invention includes: a worktable, on which a lower die assembly and a mounting frame mounted above the lower die assembly are provided; a lifting seat is movably mounted on the mounting frame; an upper die assembly cooperating with the lower die assembly is connected to the lifting seat; a crank-connecting rod mechanism connected to the lifting seat is provided on the mounting frame; the crank-connecting rod mechanism includes a crankshaft rotatably mounted on the mounting frame and a connecting arm connecting the crankshaft and the lifting seat; a servo motor driving the crankshaft to rotate is connected to the crankshaft; an encoder is provided on the shaft of the servo motor; the encoder is electrically connected to a control module for controlling the rotational speed of the servo motor; the control module controls the servo motor to accelerate its rotation so that the upper die assembly quickly approaches or moves away from the lower die assembly; the control module controls the servo motor to decelerate its rotation or pause its rotation to prolong the time when the upper die assembly and the lower die assembly are in contact.

[0007] A servo stamping device according to an embodiment of the present utility model has at least the following beneficial effects:

[0008] The above servo stamping equipment can use the control module to freely control the speed of the servo motor to realize the lifting speed of the upper die assembly at different height positions. Before contacting the workpiece, it can drive the upper die assembly to quickly close with the lower die assembly. When contacting the workpiece, it can drive the upper die assembly to slowly approach the lower die assembly and pause the rotation of the servo motor to extend the mold closing time. This enables segmented control of the stamping rate and adjustment of the mold closing time, and allows for free adjustment of the stamping action according to processing needs to achieve the corresponding forming quality.

[0009] In some embodiments of this utility model, the mounting frame is fixed to the workbench by four columns located at the four corners of a rectangle, the lower mold assembly is located within the space enclosed by the four columns, and a feeding gap is formed between two adjacent columns to allow materials to enter the lower mold assembly.

[0010] In some embodiments of this utility model, the crankshaft is arranged horizontally relative to the worktable, and bearings are provided between the two ends of the crankshaft and the mounting frame. The connecting arm includes a bushing assembly sleeved on the eccentric part of the crankshaft and a ball joint connected to the bushing assembly. A ball joint seat is provided in the middle of the lifting seat. The ball head of the ball joint extends downward and is rotatably connected to the ball joint seat. The lifting seat is provided with multiple guide posts extending downward through the mounting frame on the outer periphery of the ball joint seat. The lower end of the guide posts is connected to the upper mold assembly. The contact position between the ball head and the ball joint seat, the contact position between the guide post and the mounting frame, the contact position between the bushing assembly and the crankshaft, and the rolling element of the bearing all constitute a lubrication part. Each lubrication part is connected to the oil circulation system.

[0011] In some embodiments of this utility model, the oil circulation system includes an oil tank, an oil pipe connecting the oil tank and each of the parts to be lubricated, and a pump body that drives the oil in the oil pipe to circulate.

[0012] In some embodiments of this utility model, the oil pipe includes an oil supply pipe and an oil return pipe connected to the oil tank. The oil supply pipe is connected to an oil distributor. The oil distributor has multiple oil supply branches corresponding one-to-one with the parts to be lubricated. Each oil supply branch is equipped with a flow control valve. The mounting frame includes a support base mounted on the lower mold assembly. The guide post passes through the support base. The support base has an oil collection channel inside that communicates with all the parts to be lubricated. The oil return pipe is connected to the oil collection channel.

[0013] In some embodiments of this utility model, the mounting bracket is provided with a sealed lubrication box on the outside of each of the two bearings. The sealed lubrication box is connected to one of the oil supply branches. The sealed lubrication box is connected to a drainage pipe that guides the oil to the outer peripheral wall of one of the guide columns. The support base is provided with a sleeve through which the guide column passes. The gap between the sleeve and the guide column can connect to the oil collection channel.

[0014] In some embodiments of this utility model, a bearing shell is fixedly provided on the outer peripheral wall of the eccentric portion of the crankshaft, and the bushing assembly includes an upper bushing and a lower bushing that are sleeved on the outside of the bearing shell and spliced ​​into a whole. The rod portion of the ball joint is fixedly connected to the lower bushing, and an oil passage is provided through the ball joint along its rod direction. An oil supply branch is connected between the upper bushing and the bearing shell, and between the lower bushing and the bearing shell.

[0015] In some embodiments of this utility model, the ball head seat has a spherical cavity that mates with the ball head, and an oil drain hole is provided through the bottom of the spherical cavity that is opposite to the oil passage hole. The oil between the lower bushing and the bearing can flow back to the oil collection channel through the oil passage hole and the oil drain hole in sequence.

[0016] In some embodiments of this utility model, the lifting seat and the upper mold assembly are both rectangular plates, the ball head seat is located at the center of the lifting seat, and the four guide columns are respectively connected between the four corners of the lifting seat and the four corners of the upper mold assembly.

[0017] In some embodiments of this utility model, a central column passing through the mounting frame is further provided between the lifting seat and the upper mold assembly. The center of the ball head seat, the geometric center of the lifting seat, and the geometric center of the upper mold assembly are all located on the axis of the central column, and the diameter of the central column is larger than the diameter of the guide column.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the structure of one embodiment of the servo stamping equipment of this utility model;

[0021] Figure 2 for Figure 1A partial structural diagram of the embodiment where a portion of the mounting bracket is removed;

[0022] Figure 3 for Figure 2 A cross-sectional schematic diagram;

[0023] Figure 4 for Figure 2 Another cross-sectional diagram.

[0024] Figure label:

[0025] Workbench 100; Column 110; Lower mold assembly 200; Mounting bracket 300; Support base 310; Sleeve 311; Oil collection channel 320; Sealed lubrication box 330; Lifting seat 400; Ball head seat 410; Spherical cavity 411; Oil drain hole 412; Guide column 420; Upper mold assembly 500; Crankshaft 610; Bearing 611; Bearing bush 612; Connecting arm 620; Bushing assembly 621; Ball head rod 622; Oil passage hole 623; Servo motor 630; Oil circulation system 700; Oil tank 710; Oil pipe 720; Pump body 730; Oil distributor 740; Oil supply branch 750; Drain pipe 760; Center column 800. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] See Figures 1 to 4 This utility model discloses a servo stamping device, comprising: a worktable 100, on which a lower die assembly 200 and a mounting frame 300 mounted above the lower die assembly 200 are provided; a lifting seat 400 is movably and vertically mounted on the mounting frame 300; the lifting seat 400 is connected to an upper die assembly 500 that cooperates with the lower die assembly 200; and a crank-connecting rod mechanism connected to the lifting seat 400 is provided on the mounting frame 300. The crank-connecting rod mechanism includes a crankshaft 610 rotatably mounted on the mounting frame 300 and a connecting rod 610 connected to the upper die assembly 500. The connecting arm 620 between the lifting seats 400 is connected to the crankshaft 610, which is connected to a servo motor 630 that drives its rotation. The shaft of the servo motor 630 is equipped with an encoder, which is electrically connected to a control module for controlling the rotation speed of the servo motor 630. The control module controls the servo motor 630 to accelerate its rotation so that the upper mold assembly 500 quickly approaches or moves away from the lower mold assembly 200. The control module also controls the servo motor 630 to decelerate its rotation or pause to prolong the time when the upper mold assembly 500 and the lower mold assembly 200 are in contact.

[0031] The above servo stamping equipment can use the control module to freely control the speed of the servo motor 630 to realize the lifting speed of the upper die assembly 500 at different height positions. Before contacting the workpiece, it can drive the upper die assembly 500 to quickly close with the lower die assembly 200. When contacting the workpiece, it can drive the upper die assembly 500 to slowly approach the lower die assembly 200 and pause the rotation of the servo motor 630 to extend the mold closing time. This enables segmented control of the stamping rate and adjustment of the mold closing time, and allows for free adjustment of the stamping action to achieve the corresponding forming quality according to processing needs.

[0032] See Figure 1In some embodiments of this utility model, the mounting frame 300 is fixed to the workbench 100 by four columns 110 located at the four corners of a rectangle. The lower die assembly 200 is located within the space enclosed by the four columns 110, and a feeding gap is formed between adjacent columns 110 to allow material to enter the lower die assembly 200. It can be understood that the four columns 110 support the mounting frame 300 on the workbench 100, forming four feeding gaps in the left-right and front-back directions. Material can come to the lower die assembly 200 from four directions, which is beneficial for multi-part stamping assembly.

[0033] See Figure 1 , Figure 3 and Figure 4 In some embodiments of this utility model, the crankshaft 610 is arranged horizontally relative to the worktable 100. Bearings 611 are provided between both ends of the crankshaft 610 and the mounting bracket 300. The connecting arm 620 includes a bushing assembly 621 sleeved on the eccentric part of the crankshaft 610 and a ball joint 622 connected to the bushing assembly 621. A ball joint seat 410 is provided in the middle of the lifting seat 400. The ball head of the ball joint 622 extends downward and is rotatably connected within the ball joint seat 410. The lowering seat 400 is provided with multiple guide posts 420 that pass downward through the mounting frame 300 on the outer periphery of the ball head seat 410. The lower end of the guide post 420 is connected to the upper mold assembly 500. The contact position between the ball head and the ball head seat 410, the contact position between the guide post 420 and the mounting frame 300, the contact position between the bushing assembly 621 and the crankshaft 610, and the rolling element of the bearing 611 all constitute a lubrication part. Each of the lubrication parts is connected to the oil circulation system 700. Understandably, the servo motor 630 drives the crankshaft 610 to rotate, and the rotation of the crankshaft 610 causes the connecting arm 620 to swing. The connecting arm 620 drives the lifting seat 400 to slide up and down through the cooperation of the ball joint rod 622 and the ball joint seat 410. The guide column 420 guides the up and down sliding of the lifting seat 400. At the contact positions of the ball joint head and the ball joint seat 410, the contact positions of the guide column 420 and the mounting bracket 300, the contact positions of the bushing assembly 621 and the crankshaft 610, and the rolling elements of the two bearings 611, continuous lubrication and cooling are required. The oil circulation system 700 can lubricate and cool the above-mentioned parts, avoid abnormal wear, and extend the service life of the servo stamping equipment.

[0034] See Figure 1In some embodiments of this utility model, the oil circulation system 700 includes an oil tank 710, an oil pipe 720 connecting the oil tank 710 and each of the parts to be lubricated, and a pump body 730 that drives the oil in the oil pipe 720 to circulate. Specifically, the pump body 730 supplies the oil in the oil tank 710 to each part to be lubricated, and then returns it to the oil tank 710 through the oil pipe 720, completing the cyclic flow for lubrication and cooling.

[0035] See Figure 1 and Figure 2 In some embodiments of this utility model, the oil pipe 720 includes an oil supply pipe and an oil return pipe connected to the oil tank 710. The oil supply pipe is connected to an oil distributor 740. The oil distributor 740 has multiple oil supply branches 750 corresponding to the parts to be lubricated. Each oil supply branch 750 is equipped with a flow control valve. The mounting bracket 300 includes a support base 310 mounted on the lower mold assembly 200. The guide post 420 passes through the support base 310. The support base 310 has an oil collection channel 320 inside that communicates with all the parts to be lubricated. The oil return pipe is connected to the oil collection channel 320. Understandably, the oil distributor 740 is equipped with multiple oil supply branches 750 to supply oil to each part to be lubricated. According to different flow requirements, the oil supply of each oil supply branch 750 can be individually adjusted by the flow control valve to adapt to the oil flow required by different parts to be lubricated. Then, the oil passing through these parts to be lubricated finally flows back to the oil collection channel 320 and then returns to the oil tank 710 for circulation.

[0036] See Figures 2 to 4 In some embodiments of this utility model, the mounting bracket 300 is provided with a sealed lubrication box 330 on the outside of each of the two bearings 611. The sealed lubrication box 330 is connected to one of the oil supply branches 750. The sealed lubrication box 330 is connected to a drain pipe 760 that guides the oil to the outer peripheral wall of one of the guide posts 420. The support base 310 is provided with a sleeve 311 through which the guide post 420 passes. The gap between the sleeve 311 and the guide post 420 can connect to the oil collection channel 320. It can be understood that the two oil supply branches 750 input oil into the two sealed lubrication boxes 330. After the oil lubricates and cools the bearings 611, it reaches the inner wall of the sleeve 311 through the drain pipe 760, which can reduce the number of oil supply branches 750.

[0037] See Figure 3 and Figure 4In some embodiments of this utility model, a bearing 612 is fixedly provided on the outer peripheral wall of the eccentric portion of the crankshaft 610. The bushing assembly 621 includes an upper bushing and a lower bushing that are sleeved on the outside of the bearing 612 and spliced ​​into a whole. The rod portion of the ball joint 622 is fixedly connected to the lower bushing. An oil passage 623 is provided through the ball joint 622 along its rod direction. An oil supply branch 750 is connected between the upper bushing and the bearing 612, and between the lower bushing and the bearing 612. With the above structure, the oil after the contact position between the lubricating bushing assembly 621 and the crankshaft 610 can be guided to the contact position between the ball head and the ball head seat 410, which can reduce the number of oil supply branches 750 and reduce the difficulty of guiding the oil to the ball head.

[0038] See Figure 3 and Figure 4 In some embodiments of this utility model, the ball head seat 410 has a spherical cavity 411 that mates with the ball head. An oil drain hole 412, opposite to the oil passage 623, is provided through the bottom of the spherical cavity 411. Oil located between the lower bushing and the bearing 612 can flow back into the oil collection channel 320 via the oil passage 623 and the oil drain hole 412. It should be noted that the oil lubricates the contact surface between the spherical cavity 411 and the ball head, and then flows back into the oil collection channel 320 via the oil drain hole 412, eliminating the need for additional pipelines for oil return.

[0039] See Figure 2 and Figure 3 In some embodiments of this utility model, in order to better transmit the downward pressure to the lifting seat 400 and ensure that the lifting seat 400 can move smoothly up and down, both the lifting seat 400 and the upper mold assembly 500 are rectangular plates. The ball head seat 410 is located at the center of the lifting seat 400, and the four guide columns 420 are respectively connected between the four corners of the lifting seat 400 and the four corners of the upper mold assembly 500.

[0040] In some embodiments of this utility model, when the middle part of the lifting seat 400 is pushed downward by the connecting arm 620, in order to prevent the center position of the lifting seat 400 from undergoing slight concavity deformation, a central column 800 passing through the mounting frame 300 is provided between the lifting seat 400 and the upper mold assembly 500. The center of the ball head seat 410, the geometric center of the lifting seat 400, and the geometric center of the upper mold assembly 500 are all located on the axis of the central column 800, and the diameter of the central column 800 is larger than the diameter of the guide column 420.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A servo stamping device, characterized in that, include: A workbench (100) is provided, on which a lower mold assembly (200) and a mounting frame (300) are mounted above the lower mold assembly (200). A lifting seat (400) is movably and vertically mounted on the mounting frame (300). An upper mold assembly (500) that cooperates with the lower mold assembly (200) is connected to the lifting seat (400). A crank-connecting rod mechanism connected to the lifting seat (400) is provided on the mounting frame (300). The crank-connecting rod mechanism includes a crankshaft (610) rotatably mounted on the mounting frame (300) and a crankshaft (610) connected to the lifting seat (500). The crankshaft (610) is connected to the connecting arm (620) between the upper mold assembly (500) and the lower mold assembly (200). The crankshaft (610) is connected to a servo motor (630) that drives its rotation. The servo motor (630) has an encoder on its shaft. The encoder is electrically connected to a control module for controlling the rotation speed of the servo motor (630). The control module controls the servo motor (630) to accelerate its rotation so that the upper mold assembly (500) quickly approaches or moves away from the lower mold assembly (200). The control module also controls the servo motor (630) to decelerate its rotation or pause to prolong the time when the upper mold assembly (500) and the lower mold assembly (200) are in contact.

2. The servo stamping equipment according to claim 1, characterized in that: The mounting frame (300) is fixed to the workbench (100) by four columns (110) located at the four corners of the rectangle. The lower mold assembly (200) is located within the space enclosed by the four columns (110). A feeding gap is formed between two adjacent columns (110) to allow materials to enter the lower mold assembly (200).

3. The servo stamping equipment according to claim 1, characterized in that: The crankshaft (610) is horizontally arranged relative to the worktable (100). Bearings (611) are provided between both ends of the crankshaft (610) and the mounting bracket (300). The connecting arm (620) includes a bushing assembly (621) sleeved on the eccentric part of the crankshaft (610) and a ball joint rod (622) connected to the bushing assembly (621). A ball joint seat (410) is provided in the middle of the lifting seat (400). The ball head of the ball joint rod (622) extends downward and is rotatably connected within the ball joint seat (410). The lifting seat (400) Multiple guide posts (420) are provided on the outer periphery of the ball head seat (410) and pass downward through the mounting bracket (300). The lower end of the guide post (420) is connected to the upper mold assembly (500). The contact position between the ball head and the ball head seat (410), the contact position between the guide post (420) and the mounting bracket (300), the contact position between the bushing assembly (621) and the crankshaft (610), and the rolling element of the bearing (611) all constitute a lubrication part. Each lubrication part is connected to the oil circulation system (700).

4. A servo stamping device according to claim 3, characterized in that: The oil circulation system (700) includes an oil tank (710), an oil pipe (720) connecting the oil tank (710) and each of the parts to be lubricated, and a pump body (730) for driving the oil in the oil pipe (720) to circulate.

5. A servo stamping device according to claim 4, characterized in that: The oil pipe (720) includes an oil supply pipe and an oil return pipe connected to the oil tank (710). The oil supply pipe is connected to an oil distributor (740). The oil distributor (740) has multiple oil supply branches (750) corresponding to the parts to be lubricated. Each oil supply branch (750) is equipped with a flow control valve. The mounting bracket (300) includes a support base (310) mounted on the lower mold assembly (200). The guide column (420) passes through the support base (310). The support base (310) has an oil collection channel (320) inside that communicates with all the parts to be lubricated. The oil return pipe is connected to the oil collection channel (320).

6. A servo stamping device according to claim 5, characterized in that: The mounting bracket (300) is provided with a sealing lubrication box (330) on the outside of each of the two bearings (611). The sealing lubrication box (330) is connected to one of the oil supply branches (750). The sealing lubrication box (330) is connected to a drain pipe (760) that guides the oil to the outer peripheral wall of one of the guide posts (420). The support base (310) is provided with a sleeve (311) through which the guide post (420) passes. The gap between the sleeve (311) and the guide post (420) can connect to the oil collection channel (320).

7. A servo stamping device according to claim 5, characterized in that: The outer peripheral wall of the eccentric part of the crankshaft (610) is fixedly provided with a bearing shell (612). The bushing assembly (621) includes an upper bushing and a lower bushing that are sleeved on the outside of the bearing shell (612) and spliced ​​into a whole. The rod of the ball joint (622) is fixedly connected to the lower bushing. The ball joint (622) is provided with an oil passage hole (623) through it along its rod direction. There is an oil supply branch (750) connecting the upper bushing and the bearing shell (612) and the lower bushing and the bearing shell (612).

8. A servo stamping device according to claim 7, characterized in that: The ball head seat (410) has a spherical cavity (411) that mates with the ball head. The bottom of the spherical cavity (411) is provided with an oil drain hole (412) that is opposite to the oil passage hole (623). The oil between the lower bushing and the bearing (612) can flow back to the oil collection channel (320) through the oil passage hole (623) and the oil drain hole (412) in sequence.

9. A servo stamping device according to claim 3, characterized in that: Both the lifting seat (400) and the upper mold assembly (500) are rectangular plates. The ball head seat (410) is located at the center of the lifting seat (400). The four guide columns (420) are respectively connected between the four corners of the lifting seat (400) and the four corners of the upper mold assembly (500).

10. A servo stamping device according to claim 9, characterized in that: A central column (800) passing through the mounting frame (300) is also provided between the lifting seat (400) and the upper mold assembly (500). The center of the ball head seat (410), the geometric center of the lifting seat (400), and the geometric center of the upper mold assembly (500) are all located on the axis of the central column (800). The diameter of the central column (800) is larger than the diameter of the guide column (420).

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