Steel ball pressing equipment for retainer
By designing a retainer pressing steel ball device for synchronous adsorption material rack, synchronous feeding and continuous pressing of large and small ring material racks are realized, solving the problem of low equipment utilization in the existing technology and improving the steel ball pressing efficiency.
Patent Information
- Application Number
- CN202520285021.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing technologies cannot process large and small ring material racks simultaneously, requiring machine shutdown and station switching, resulting in low steel ball pressing efficiency and low equipment utilization.
Design a cage pressing steel ball device, which uses two rows of suction nozzles on the material rack suction cup to simultaneously adsorb small ring material racks and large ring material racks, and uses the four-station intermittent rotation of the material rack rotating cross to cooperate with the double-head frame to alternately press steel balls, so as to achieve synchronous feeding and continuous pressing.
This technology solves the problems of existing technologies, such as the inability to simultaneously process large and small ring material racks, the need to stop the machine to switch workstations, and the low efficiency of steel ball pressing. It enables synchronous feeding and continuous pressing of the two types of material racks, thereby improving production efficiency.
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Figure CN223825465U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of frame steel ball, especially to a retainer frame steel ball equipment. BACKGROUND
[0002] In the production process of precision parts such as bearing retainer, it is usually necessary to press-fit steel balls on small and large ring material racks respectively, and then combine the two into finished products. In the traditional process, the steel ball press-fitting of small and large ring material racks relies on semi-automatic equipment or manual operation: for example, the small and large ring material racks are clamped by independent feeding mechanisms respectively, and then steel balls are installed one by one by manual or simple mechanical devices. Such equipment often needs to frequently switch tooling or adjust the clamping mechanism, resulting in low production efficiency, and manual intervention is prone to introduce errors, affecting product consistency.
[0003] In the prior art, some automatic equipment attempts to adopt a split design, that is, independent small ring material rack processing stations and large ring material rack processing stations are set up, and the two are sequentially transferred to the pressing area by a conveying mechanism. However, such a scheme still has obvious defects: first, the split stations need to position and transfer the material racks multiple times, resulting in large equipment footprint and complex process; second, the steel ball installation mechanism is usually a single-head structure, which needs to stop and switch the small and large ring steel ball discharge trays, making it difficult to realize continuous operation; third, the material rack clamping mechanism is usually a single suction nozzle or clamp, which cannot simultaneously process material racks of different sizes, resulting in low equipment utilization.
[0004] Therefore, the inventors designed a retainer frame steel ball equipment to solve the above problems. UTILITY MODEL CONTENTS
[0005] In view of the defects of the prior art, the utility model provides a retainer frame steel ball equipment to solve the problem that the prior art cannot simultaneously process small and large ring material racks, needs to stop and switch stations, and has low steel ball press-fitting efficiency.
[0006] To achieve the above object, the technical scheme adopted by the utility model is: a cage steel ball pressing equipment, including a machine table, a steel ball discharging device, a rack discharging device and a rotary pressing discharging device are arranged on the machine table, the rack discharging device includes a small ring rack discharging mechanism, a large ring rack discharging mechanism and a rack discharging drive mechanism, an output end of the rack discharging drive mechanism is provided with a rack suction cup, two rows of suction nozzles are arranged on the rack suction cup, one row of suction nozzles is matched with the adsorption position of the small ring rack, and the other row of suction nozzles is matched with the adsorption position of the large ring rack, the rotary pressing discharging device includes a rack mounting rotating mechanism and a steel ball discharging rotating mechanism, the rack mounting rotating mechanism includes a rack rotating cross and four rack mounting tables, the steel ball discharging rotating mechanism includes a double head frame and a large ring steel ball mounting assembly and a small ring steel ball mounting assembly at the two ends of the double head frame, the rack suction cup simultaneously clamps the small ring rack and the large ring rack through the two rows of suction nozzles and synchronously moves the small ring rack and the large ring rack to the rack mounting table, and the double head frame alternately installs steel balls to the large ring rack and the small ring rack at the two ends.
[0007] Based on the above, the cage steel ball pressing equipment has the beneficial effects of solving the problems that the existing technology cannot synchronously process the small ring rack and the large ring rack, needs to stop and switch the station and the steel ball pressing efficiency is low, mainly embodied in the following aspects: the utility model synchronously adsorbs the small ring rack and the large ring rack through the two rows of suction nozzles of the rack suction cup, and through the intermittent rotation of the four stations of the rack rotating cross, drives the rack mounting table to sequentially complete the processes of feeding, pressing and discharging, cooperates with the large ring steel ball mounting assembly and the small ring steel ball mounting assembly at the two ends of the double head frame to alternately press the steel balls, realizes the synchronous feeding and continuous pressing of the two racks, thereby, the pressing efficiency of the steel balls is accelerated without stopping and switching the tooling.
[0008] Further, the steel ball discharging device includes a steel ball discharging machine, a small ring steel ball discharging disc, a large ring steel ball discharging disc and a steel ball discharging drive mechanism, the small ring steel ball discharging disc and the large ring steel ball discharging disc are connected with the output end of the steel ball discharging drive mechanism through a connecting plate, and the steel ball discharging machine is arranged above the steel ball discharging drive mechanism.
[0009] Based on the above, the steel ball discharging drive mechanism has the beneficial effects of synchronously driving the small ring steel ball discharging disc and the large ring steel ball discharging disc to move horizontally through the connecting plate, realizing the cooperative feeding of the two specifications of steel ball discharging discs and avoiding the efficiency loss of the step-by-step operation of the traditional equipment.
[0010] Further, the steel ball discharging drive mechanism includes a mounting frame, a cylinder drive assembly mounted at the lower end of the mounting frame and sliding blocks mounted at the upper ends of the two sides of the mounting frame, the connecting plate is slidingly matched between the two sliding blocks, and the small ring steel ball discharging disc and the large ring steel ball discharging disc are fixed at the lower end of the connecting plate.
[0011] Based on the above, the beneficial effects of the electric cylinder driving assembly are that the driving connecting plate moves smoothly along the guide of the sliding block, and the horizontal displacement accuracy of the small ring steel ball discharge disc and the large ring steel ball discharge disc is ensured.
[0012] Further, the connecting plate is provided with a hole part through which the steel balls pass, and the steel ball discharge rotating mechanism takes the small ring steel ball discharge disc and the large ring steel ball discharge disc through the hole part.
[0013] Based on the above, the beneficial effects of the hole part design of the connecting plate are that the steel ball discharge rotating mechanism provides an unobstructed taking path, avoids interference between the steel balls and the connecting plate during the transfer process, and ensures the continuity and reliability of the double-head frame alternating taking.
[0014] Further, the small ring material rack discharge mechanism and the large ring material rack discharge mechanism each include a material rack lifting electric cylinder, a large ring positioning frame, and a small ring positioning frame, the inner wall of the large ring positioning frame is provided with a large ring material rack matching groove, and the outer wall of the small ring positioning frame is provided with a small ring material rack matching groove.
[0015] Based on the above, the large ring material rack matching groove of the large ring positioning frame and the small ring material rack matching groove of the small ring positioning frame are respectively adapted to the shape of the material rack, and in combination with the lifting drive of the material rack lifting electric cylinder, the beneficial effects are that the accurate positioning and stable transfer of the large and small ring material racks are achieved, and the manual adjustment link is reduced.
[0016] Further, the output end of the material rack lifting electric cylinder is provided with a ring-shaped jacking block, the ring-shaped jacking block passes through the material rack discharge mounting table and is located between the large ring positioning frame and the small ring positioning frame.
[0017] Based on the above, the beneficial effects of the ring-shaped jacking block are that the large ring material rack or the small ring material rack is jacked up in the matching groove of the large ring positioning frame or the small ring positioning frame through a vertical lifting action, and uniform support is formed by the outer ring or the inner ring structure of the large ring material rack or the small ring material rack and the outer wall or the inner wall of the large ring material rack or the small ring material rack, avoiding tilting or deviation of the large ring material rack or the small ring material rack during the transfer process.
[0018] Further, the rotating and pressing discharge device further includes a pressing frame, the material rack mounting rotating mechanism and the steel ball discharge rotating mechanism are respectively mounted on both sides of the pressing frame, and the material rack mounting tables at the four ends of the material rack rotating cross frame sequentially pass through the workstations of the material rack discharge driving mechanism, the steel ball discharge rotating mechanism, and the finished product discharge mechanism.
[0019] Based on the above, the layout of the two sides of the pressing frame enables the material rack mounting rotating mechanism and the steel ball discharge rotating mechanism to work cooperatively, through the intermittent rotation of the four workstations of the material rack rotating cross frame, the continuous circulation of the feeding, pressing, and discharging processes is realized, and the redundant action of workstation switching is reduced.
[0020] Further, the large ring steel ball mounting assembly comprises a large ring steel ball suction disc, and the small ring steel ball mounting assembly comprises a small ring steel ball suction disc, and the suction holes of the large ring steel ball suction disc and the small ring steel ball suction disc correspond to the steel ball channels of the large ring steel ball discharge disc and the small ring steel ball discharge disc respectively.
[0021] Based on the above, the beneficial effects of the precise alignment of the suction holes of the large ring steel ball suction disc and the small ring steel ball suction disc with the steel ball channels of the small ring steel ball discharge disc and the large ring steel ball discharge disc are to ensure the rapid transfer of steel balls from the discharge disc to the rack, and the independent design of the two suction discs adapts to the pressing needs of racks of different specifications.
[0022] Further, the rack mounting rotating mechanism further comprises a rack mounting rotating motor, and the rack mounting rotating motor drives the rack rotating cross to rotate intermittently by 90 degrees.
[0023] Based on the above, the beneficial effects of the 90-degree intermittent rotation control of the rack mounting rotating motor are to make the four rack mounting tables of the rack rotating cross accurately stop at each station, realize the automatic circulation of feeding, pressing and discharging, and improve the production continuity.
[0024] Further, the finished product discharging mechanism is located at one end of the pressing frame outside and close to the rack mounting rotating mechanism, and discharges the rack with installation completed through the clamping structure.
[0025] Based on the above, the beneficial effects of the cooperation of the clamping structure of the finished product discharging mechanism and the rotating station of the rack mounting table are to directly clamp the finished product rack and move it out after pressing, avoid manual intervention, improve the discharging efficiency and vacate the feeding space for the next cycle.
[0026] In order to make the above features of the utility model and the purposes to be achieved more clearly, the utility model will be further described in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 It is a perspective view of the utility model;
[0028] Figure 2 It is a schematic view of the steel ball discharging device of the utility model;
[0029] Figure 3 It is a schematic view of another view of the steel ball discharging device of the utility model;
[0030] Figure 4 It is a schematic view of the rack discharging device of the utility model;
[0031] Figure 5 It is a schematic view of the small ring rack discharging mechanism and the large ring rack discharging mechanism of the utility model;
[0032] Figure 6 :for Figure 5 An enlarged schematic diagram of part A;
[0033] Figure 7 : This is a schematic diagram of the rotary pressing and discharging device of this utility model.
[0034] Reference numerals: 1-Machine base, 2-Steel ball discharge device, 21-Steel ball discharge machine, 22-Small ring steel ball discharge plate, 23-Large ring steel ball discharge plate, 24-Steel ball discharge drive mechanism, 241-Mounting bracket, 242-Electric cylinder drive assembly, 243-Sliding block, 25-Connecting plate, 3-Material rack discharge device, 31-Small ring material rack discharge mechanism, 311-Material rack lifting electric cylinder, 3111-Annular lifting block, 312-Large ring positioning bracket, 3121-Large ring material rack matching slot, 313-Small ring positioning bracket, 3131-Small ring material rack matching slot, 32-Large ring material rack discharge mechanism, 33- Material rack discharge drive mechanism, 3323-material rack suction cup, 33231-suction nozzle, 34-material rack discharge mounting platform, 4-rotary pressing discharge device, 41-material rack mounting rotation mechanism, 411-material rack mounting rotation motor, 412-material rack rotating cross, 413-material rack mounting platform, 42-steel ball discharge rotation mechanism, 422-double-head frame, 423-large ring steel ball mounting assembly, 4232-large ring steel ball suction cup, 424-small ring steel ball mounting assembly, 4242-small ring steel ball suction cup, 43-finished product discharge mechanism, 44-pressing frame, 100-small ring material rack, 200-large ring material rack. Detailed Implementation
[0035] like Figures 1-7 As shown, a cage-pressed steel ball device includes a machine base 1, on which a steel ball discharge device 2, a rack discharge device 3, and a rotary pressing discharge device 4 are provided. The rack discharge device 3 includes a small ring rack discharge mechanism 31, a large ring rack discharge mechanism 32, and a rack discharge drive mechanism 33. The output end of the rack discharge drive mechanism 33 is provided with a rack suction cup 3323. The rack suction cup 3323 is provided with two rows of suction nozzles 33231, one row of suction nozzles matching the adsorption position of the small ring rack 100, and the other row of suction nozzles matching the adsorption position of the large ring rack 200. The rotary pressing discharge device 4 includes... The device includes a material rack mounting and rotating mechanism 41 and a steel ball discharging and rotating mechanism 42. The material rack mounting and rotating mechanism 41 includes a material rack rotating cross 412 and four material rack mounting platforms 413. The steel ball discharging and rotating mechanism 42 includes a double-headed frame 422 and large ring steel ball mounting assemblies 423 and small ring steel ball mounting assemblies 424 at both ends. The material rack suction cup 3323 simultaneously clamps the small ring material rack 100 and the large ring material rack 200 through two rows of suction nozzles and synchronously transfers them to the material rack mounting platform 413. The two ends of the double-headed frame 422 alternately install steel balls on the large ring material rack 200 and the small ring material rack 100.
[0036] The steel ball discharging device 2 comprises a steel ball discharging machine 21, a small-ring steel ball discharging disc 22, a large-ring steel ball discharging disc 23, and a steel ball discharging driving mechanism 24. The small-ring steel ball discharging disc 22 and the large-ring steel ball discharging disc 23 are connected with the output end of the steel ball discharging driving mechanism 24 through a connecting plate 25. The steel ball discharging machine 21 is arranged above the steel ball discharging driving mechanism 24.
[0037] The steel ball discharging driving mechanism 24 comprises a mounting frame 241, a cylinder driving assembly 242 mounted at the lower end of the mounting frame 241, and sliding blocks 243 mounted at the upper end of the mounting frame 241. The connecting plate 25 is slidingly fitted between the two sliding blocks 243. The small-ring steel ball discharging disc 22 and the large-ring steel ball discharging disc 23 are fixed at the lower end of the connecting plate 25.
[0038] The connecting plate 25 is provided with a hole portion through which the steel balls pass. The steel ball discharging rotating mechanism 42 takes the material from the small-ring steel ball discharging disc 22 and the large-ring steel ball discharging disc 23 through the hole portion.
[0039] The small-ring rack discharging mechanism 31 and the large-ring rack discharging mechanism 32 each comprise a rack lifting cylinder 311, a large-ring positioning frame 312, and a small-ring positioning frame 313. The inner wall of the large-ring positioning frame 312 is provided with a large-ring rack matching groove 3121. The outer wall of the small-ring positioning frame 313 is provided with a small-ring rack matching groove 3131.
[0040] The output end of the rack lifting cylinder 311 is provided with an annular jacking block 3111. The annular jacking block 3111 passes through a rack discharging mounting table 34 and is located between the large-ring positioning frame 312 and the small-ring positioning frame 313.
[0041] The rotating and pressing discharging device 4 further comprises a pressing frame 44. The rack mounting rotating mechanism 41 and the steel ball discharging rotating mechanism 42 are respectively mounted at the two sides of the pressing frame 44. The rack mounting table 413 at the four ends of the rack rotating cross frame 412 sequentially passes through the rack discharging driving mechanism 33, the steel ball discharging rotating mechanism 42, and the finished product discharging mechanism 43.
[0042] The large-ring steel ball mounting assembly 423 comprises a large-ring steel ball suction cup 4232. The small-ring steel ball mounting assembly 424 comprises a small-ring steel ball suction cup 4242. The suction holes of the large-ring steel ball suction cup 4232 and the small-ring steel ball suction cup 4242 respectively correspond to the steel ball passages of the large-ring steel ball discharging disc 23 and the small-ring steel ball discharging disc 22.
[0043] The rack mounting rotating mechanism 41 further comprises a rack mounting rotating motor 411. The rack mounting rotating motor 411 drives the rack rotating cross frame 412 to intermittently rotate by 90 degrees.
[0044] The finished product discharge mechanism 43 is located on the outside of the pressing frame 44, near the end of the material rack mounting rotating mechanism 41, and discharges the installed material rack through a clamping structure.
[0045] In summary, the specific embodiments of this utility model are as follows:
[0046] First, the lifting cylinders 311 of the small ring material rack discharge mechanism 31 and the large ring material rack discharge mechanism 32 drive the annular lifting block 3111 to rise vertically, lifting the stacked small ring material rack 100 and large ring material rack 200 to the highest positions of the small ring material rack matching slot 3131 of the small ring positioning frame 313 and the large ring material rack matching slot 3121 of the large ring positioning frame 312, respectively. At this time, the small ring material rack 100 and the large ring material rack 200 are precisely positioned, and the material rack discharge drive mechanism 33... The suction cup 3323 sequentially adsorbs the small ring material rack 100 and the large ring material rack 200 located at the highest position on the small ring material rack discharge mechanism 31 and the large ring material rack discharge mechanism 32 through two rows of suction nozzles 33231. Then, the material rack discharge drive mechanism 33 drives the material rack suction cup 3323 to move horizontally to the material rack mounting platform 413 of the material rack rotating cross 412 of the material rack mounting rotating mechanism 41, and releases the small ring material rack 100 and the large ring material rack 200 onto the empty material rack mounting platform 413.
[0047] The rotating motor 411 drives the rotating crossbar 412 of the material rack to rotate 90 degrees clockwise, so that the material rack mounting platform 413, which contains the material rack, enters the working position of the steel ball discharge rotating mechanism 42. The electric cylinder drive assembly 242 of the steel ball discharge drive mechanism 24 pushes the connecting plate 25 to slide along the sliding block 243, so that the steel ball channels of the small ring steel ball discharge plate 22 and the large ring steel ball discharge plate 23 on the connecting plate 25 are aligned with the outlet of the steel ball discharge machine 21 in sequence. The steel balls fall into the corresponding discharge plates through the holes of the connecting plate 25. The small ring steel ball suction cup 4 of the small ring steel ball mounting assembly 424 of the double-head frame 422... The large ring steel ball suction cup 4232 of the large ring steel ball mounting assembly 423 sequentially picks up steel balls from the corresponding discharge plate. After the small ring steel ball mounting assembly 424 first picks up the steel ball on the small ring steel ball discharge plate 22, the double-head frame 422 rotates 180 degrees and transfers the steel ball to the preset hole position of the small ring material rack 100 of the material rack mounting platform 413 for pressing. At the same time, after the large ring steel ball mounting assembly 423 picks up the steel ball on the large ring steel ball discharge plate 23, the double-head frame 422 rotates 180 degrees again and transfers the steel ball to the preset hole position of the large ring material rack 200 of the material rack mounting platform 413 for pressing.
[0048] After the steel ball is pressed, the rack rotating cross 412 rotates 90 degrees again, so that the rack mounting table 413 loaded with the finished product rack moves to the work station of the finished product discharging mechanism 43, the clamping structure of the finished product discharging mechanism 43 clamps the finished product rack to be mounted, and the finished product rack is moved out of the rack mounting table 413, and meanwhile, the rack rotating cross 412 continues to rotate to the initial work station, and waits for the feeding of the next cycle.
[0049] The above merely describes the optimal solution embodiment of the present application, and is not used to limit the present application. Various modifications or replacements of the present application made by those skilled in the art without departing from the essence and protection scope of the present application shall be within the protection scope of the present application.
Claims
1. A cage-pressing steel ball device, comprising a machine base (1), characterized in that: The machine base (1) is equipped with a steel ball discharge device (2), a material rack discharge device (3), and a rotary pressing discharge device (4); the material rack discharge device (3) includes a small ring material rack discharge mechanism (31), a large ring material rack discharge mechanism (32), and a material rack discharge drive mechanism (33). The output end of the material rack discharge drive mechanism (33) is equipped with a material rack suction cup (3323). The material rack suction cup (3323) is equipped with two rows of suction nozzles (33231), one row of suction nozzles matching the adsorption position of the small ring material rack (100), and the other row of suction nozzles matching the adsorption position of the large ring material rack (200); the rotary pressing discharge device (4) includes a material rack mounting rotation mechanism. (41) and a steel ball discharge rotating mechanism (42), wherein the material rack mounting rotating mechanism (41) includes a material rack rotating cross (412) and four material rack mounting platforms (413), and the steel ball discharge rotating mechanism (42) includes a double-headed frame (422) and large ring steel ball mounting components (423) and small ring steel ball mounting components (424) at both ends; the material rack suction cup (3323) clamps the small ring material rack (100) and the large ring material rack (200) simultaneously through two rows of suction nozzles, and moves them synchronously to the material rack mounting platform (413), and the two ends of the double-headed frame (422) alternately install steel balls on the large ring material rack (200) and the small ring material rack (100).
2. The cage-pressing steel ball device according to claim 1, characterized in that: The steel ball discharge device (2) includes a steel ball discharge machine (21), a small ring steel ball discharge plate (22), a large ring steel ball discharge plate (23), and a steel ball discharge drive mechanism (24). The small ring steel ball discharge plate (22) and the large ring steel ball discharge plate (23) are connected to the output end of the steel ball discharge drive mechanism (24) through a connecting plate (25). The steel ball discharge machine (21) is mounted above the steel ball discharge drive mechanism (24).
3. The cage-pressing steel ball device according to claim 2, characterized in that: The steel ball discharge drive mechanism (24) includes a mounting frame (241), an electric cylinder drive assembly (242) mounted on the lower end of the mounting frame (241), and sliding blocks (243) mounted on both sides of the upper end of the mounting frame (241). The connecting plate (25) is slidably fitted between the two sliding blocks (243), and the small ring steel ball discharge plate (22) and the large ring steel ball discharge plate (23) are fixed on the lower end of the connecting plate (25).
4. The cage-pressing steel ball device according to claim 3, characterized in that: The connecting plate (25) is provided with a hole for steel balls to pass through, and the steel ball discharge rotating mechanism (42) takes materials from the small ring steel ball discharge plate (22) and the large ring steel ball discharge plate (23) through the hole.
5. The cage-pressing steel ball device according to claim 1, characterized in that: The small ring material rack discharge mechanism (31) and the large ring material rack discharge mechanism (32) both include a material rack lifting electric cylinder (311), a large ring positioning frame (312) and a small ring positioning frame (313). The inner wall of the large ring positioning frame (312) is provided with a large ring material rack matching groove (3121), and the outer wall of the small ring positioning frame (313) is provided with a small ring material rack matching groove (3131).
6. The cage-pressing steel ball device according to claim 5, characterized in that: The output end of the material rack lifting cylinder (311) is provided with an annular lifting block (3111), which passes through the material rack discharge mounting platform (34) and is located between the large ring positioning frame (312) and the small ring positioning frame (313).
7. The cage-pressing steel ball device according to claim 1, characterized in that: The rotary pressing and discharging device (4) also includes a pressing frame (44). The material rack mounting rotation mechanism (41) and the steel ball discharging rotation mechanism (42) are respectively installed on both sides of the pressing frame (44). The material rack mounting platforms (413) at the four ends of the material rack rotating cross (412) pass through the work stations of the material rack discharging drive mechanism (33), the steel ball discharging rotation mechanism (42), and the finished product discharging mechanism (43) in sequence.
8. The cage-pressing steel ball device according to claim 1, characterized in that: The large ring steel ball mounting assembly (423) includes a large ring steel ball suction cup (4232), and the small ring steel ball mounting assembly (424) includes a small ring steel ball suction cup (4242). The suction holes of the large ring steel ball suction cup (4232) and the small ring steel ball suction cup (4242) correspond to the steel ball channels of the large ring steel ball discharge plate (23) and the small ring steel ball discharge plate (22), respectively.
9. The cage-pressing steel ball device according to claim 1, characterized in that: The material rack mounting rotation mechanism (41) also includes a material rack mounting rotation motor (411), which drives the material rack rotation cross (412) to rotate intermittently by 90 degrees.
10. A cage-pressing steel ball device according to claim 7, characterized in that: The finished product discharge mechanism (43) is located on the outside of the pressing frame (44) near the end of the material rack mounting rotating mechanism (41), and discharges the installed material rack through the clamping structure.