Feeding and discharging mechanism of machining center

Abstract

The invention relates to the technical field of part machining, and particularly discloses a machining center feeding and discharging mechanism which comprises a rack and a conveying frame installed on the rack, a bearing plate is vertically connected to the rack in a sliding mode, a machining unit for machining workpieces is installed on the bearing plate, and an air cylinder used for driving the bearing plate to vertically slide is arranged on the rack; a lifting frame is vertically connected into the rack in a sliding mode, and a lifting mechanism used for driving the lifting frame to vertically slide is arranged between the lifting frame and the rack. In the process, the lifting frame is driven to move upwards by completely utilizing the upward resetting stroke of the bearing plate, and the machined workpieces are discharged passively through the cooperation of the lifting frame and the rack in the upward moving stroke, so that the working efficiency of the discharging mechanism is greatly improved; and moreover, the mechanism is realized in a passive manner in the resetting stroke of the bearing plate, and the blanking of the workpiece can be realized without independently arranging a driving source, so that the energy consumption can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of part processing, and specifically to a loading and unloading mechanism for a machining center. Background Art

[0002] A CNC machining center is a highly efficient automated machine tool composed of mechanical equipment and a numerical control system, suitable for machining complex parts. It is one of the numerically controlled machine tools with the highest output and the widest application in the world currently. It has strong comprehensive processing capabilities. After a workpiece is clamped once, it can complete more processing contents, and the processing accuracy is relatively high. For batch workpieces with medium processing difficulty, its efficiency is 5 to 10 times that of ordinary equipment. In particular, it can complete many processes that ordinary equipment cannot perform, and is more suitable for single-piece processing or small and medium batch production of various products with relatively complex shapes and high precision requirements. It integrates functions such as milling, drilling, tapping, and threading on one device, making it have a variety of processing means.

[0003] Currently, most vertical machining centers still rely on manual operation in the loading and unloading process. This not only increases the operating costs of enterprises because a large amount of human resources need to be invested in this cumbersome and repetitive work. Moreover, the staff performing the loading and unloading operations for a long time is prone to fatigue, which may not only affect the processing efficiency and quality, but also may lead to potential safety hazards due to negligence.

[0004] To solve the above problems, in the prior art, such as a Chinese patent with the authorization announcement number CN222903338U and the name of a vertical numerical control machining center convenient for loading and unloading, the above patent discloses a vertical numerical control machining center convenient for loading and unloading, including a numerical control machine tool body and a loading and unloading mechanism; the loading and unloading mechanism includes a base, and support frames are arranged on both sides of the base; a cross beam is installed at the upper end of the support frame, and a first linear module is fixedly installed on one side of the cross beam; a movable plate is fixedly connected to the first linear module, and a second linear module is installed on one side of the movable plate, and a support plate is arranged on the other side of the movable plate; a lifting cylinder is arranged side by side on one side of the support plate; a third linear module is arranged above the base, and a workpiece placement table is arranged on the third linear module.

[0005] For another example, there is a Chinese patent with the authorization announcement number CN213622168 and the name of an automatic loading and unloading mechanism for an impact specimen processing center. The above patent discloses an automatic loading and unloading mechanism for an impact specimen processing center, belonging to the technical field of processing centers. The automatic loading and unloading mechanism for the impact specimen processing center includes a rotating mechanism, a translation mechanism, and a clamping mechanism. The first motor is connected to one side of the support, the output rod is installed on the output shaft of the first motor, the support plate is connected to one end of the output rod, the round rod is installed on one side of the support plate, there are four round rods, the round rods are distributed around the output rod, the slider is connected to one end of the round rod, a chute is opened on one side of the support, the slider is slidably connected in the chute, a first through hole is opened on the inner surface of the support plate, the translation mechanism is connected to one side of the support plate, the clamping plate is installed on the output shaft of the second hydraulic cylinder, the anti-slip pattern is arranged on one side of the clamping plate, and the support plate is connected to one side of the clamping plate.

[0006] In the prior art such as the above patent, it can meet the loading and unloading of workpieces to a certain extent. However, as is well known, when the workpiece is processed, it is necessary to unlock the workpiece and then use an additional driving part to drive the workpiece to unload. Since the processing die needs to move upward for resetting after processing to meet the processing requirements of subsequent workpieces, at this time, a large number of driving sources will be mixed, which will not only increase the floor space of the entire equipment but also increase the production cost and energy consumption, and there are certain deficiencies. Summary of the Invention

[0007] The purpose of the present invention is to provide a loading and unloading mechanism for a processing center to solve the problems raised in the above background technology.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A loading and unloading mechanism for a processing center includes a frame and a conveying frame installed on the frame. A bearing plate is vertically slidably connected to the frame. A processing unit for processing workpieces is installed on the bearing plate. A cylinder for driving the bearing plate to slide vertically is arranged on the frame. A lifting frame is vertically slidably connected inside the frame. A lifting mechanism for driving the lifting frame to slide vertically is arranged between the lifting frame and the frame. The lifting mechanism and the bearing plate are intermittently driven and connected through a linkage mechanism. A pushing member is slidably connected to the lifting frame. When the lifting frame slides upward, the pushing member is passively driven to slide horizontally on the lifting frame to push out the workpiece on the lifting frame.

[0009] Further, the lifting mechanism includes a rotating rod rotatably connected to the frame. An intermittent gear is installed on the rotating rod. A driving rack is fixedly connected to the lifting frame through an extension plate. The intermittent gear is intermittently engaged with the driving rack. A plurality of reset springs are also arranged between the extension plate and the frame.

[0010] Furthermore, the linkage mechanism includes a first linkage rod rotatably connected to the frame, a spur gear is installed on the first linkage rod, and a trigger rack meshing with the spur gear is installed on the supporting plate, and the trigger rack meshes with the spur gear; a second linkage rod is also rotatably connected to the frame, and the second linkage rod is connected to the first linkage rod through a one-way transmission member; the second linkage rod is connected to the rotating rod through a synchronization unit.

[0011] Furthermore, the one-way transmission unit includes a wedge-shaped rod slidably connected to the second linkage rod, a slot is provided on the first linkage rod, and a positioning spring is provided between the wedge-shaped rod and the second linkage rod, and the elastic force of the positioning spring drives the wedge-shaped rod to be clamped in the slot.

[0012] Furthermore, the pushing member includes a push plate slidably connected to the lifting frame, a trigger rod is fixedly connected to the push plate, and the trigger rod is slidably connected to the lifting frame through a slide groove, and an inclined wedge-shaped groove is provided on the frame, and the trigger rod intermittently abuts against the wedge groove; when the lifting frame slides upward, the push plate is driven to slide on the lifting frame through the cooperation of the trigger rod and the wedge-shaped groove, thereby pushing out the workpiece.

[0013] Furthermore, a conveying plate for conveying workpieces is slidably connected to the conveying frame, and a conveying portion for driving the conveying plate to slide is provided on the frame, and the conveying portion is transmission-connected to the linkage mechanism.

[0014] Furthermore, the conveying part includes a conveying screw rod rotatably connected to the conveying frame, a screw sleeve is fixed on the conveying plate, and the conveying screw rod is threadedly connected to the screw sleeve; and a second bevel gear is installed on the conveying screw rod, and a first bevel gear is installed on the second linkage rod, and the first bevel gear is meshed with the second bevel gear.

[0015] Furthermore, a pushing slide is slidably connected to the conveying plate through a positioning portion, and an extrusion spring is provided between the pushing slide and the conveying plate; the positioning portion includes a positioning block fixedly connected to the pushing slide, and the positioning block is slidably connected to the conveying plate through a positioning groove.

[0016] Furthermore, the frame is also provided with a discharge portion for driving the workpiece to be unloaded from the conveying plate.

[0017] Furthermore, the unloading part includes a unloading plate slidably connected to the frame, and a mounting spring is provided between the unloading plate and the frame; and a trigger surface is provided on the unloading plate, and a buffer pad is provided on the side of the unloading plate away from the trigger surface.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: For the loading and unloading mechanism of this machining center, during use, when machining operations need to be performed on a workpiece, the workpiece is installed inside the machining groove. Then, after driving the carrier table downward to a predetermined position, the machining unit is used to perform machining operations on the workpiece. After the workpiece is machined, a cylinder is needed to drive the carrier plate to drive the machining unit to reset upward. During the upward reset travel of the machining unit, the linkage mechanism is used to drive the lifting mechanism to move. The lifting mechanism drives the lifting frame upward to convey the workpiece to a predetermined position. Specifically, when the lifting mechanism drives the lifting frame upward, during the travel of the passive pusher on the frame, the workpiece on the lifting frame is pushed out, thereby enabling the unloading of the workpiece. During this process, it is completely by using the upward reset travel of the carrier plate to drive the lifting frame upward, and through the cooperation between the upward travel of the lifting frame and the frame, the machined workpiece is unloaded passively, greatly improving the working efficiency of this unloading mechanism. Moreover, this mechanism is realized passively during the reset travel of the carrier plate, and the unloading of the workpiece can be achieved without separately setting a driving source. It can not only save energy consumption but also ensure the continuity of the mechanism during operation, with better use effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0020] Figure 1 Schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 Schematic diagram of the structure with the frame hidden provided by an embodiment of the present invention; Figure 3 Schematic diagram of the linkage mechanism provided by an embodiment of the present invention; Figure 4 Schematic diagram of the connection mode between the lifting mechanism and the linkage mechanism provided by an embodiment of the present invention; Figure 5 Schematic diagram of the lifting frame provided by an embodiment of the present invention; Figure 6 Schematic diagram of the unlocking plate provided by an embodiment of the present invention; Figure 7 Partial cross-sectional view of the one-way transmission member provided by an embodiment of the present invention.

[0021] Explanation of the accompanying drawings: 1. frame; 2. conveying frame; 3. bearing plate; 4. cylinder; 5. lifting frame; 6. pushing member; 61. pushing plate; 62. trigger rod; 63. slide; 64. wedge groove; 7. linkage mechanism; 71. first linkage rod; 72. spur gear; 73. trigger rack; 74. one-way transmission member; 741. wedge-shaped insertion rod; 742. positioning spring; 743. slot; 75. second linkage rod; 8. lifting mechanism; 81. rotating rod; 82. driving rack; 83. intermittent gear; 84. return spring; 9. synchronization unit; 10. conveying plate; 11. workpiece; 12. pushing slide; 13. extrusion spring; 14. conveying part; 141. screw sleeve; 142. conveying screw; 143. first bevel gear; 142. second bevel gear; 15. unloading plate; 16. mounting spring; 17. buffer pad; 18. trigger surface. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figures 1-7 The present invention provides a technical solution: a loading and unloading mechanism of a machining center, comprising a frame 1 and a conveyor frame 2 installed on the frame 1, a supporting plate 3 is vertically slidably connected to the frame 1, a processing unit for processing a workpiece 11 is installed on the supporting plate 3, and a cylinder 4 for driving the supporting plate 3 to slide vertically is provided on the frame 1; a lifting frame 5 is vertically slidably connected inside the frame 1, and a lifting mechanism 8 for driving the lifting frame 5 to slide vertically is provided between the lifting frame 5 and the frame 1, and the lifting mechanism 8 is intermittently transmitted to the supporting plate 3 through a linkage mechanism 7; a pushing piece 6 is slidably connected to the lifting frame 5, and when the lifting frame 5 slides upward, the pushing piece 6 is passively driven to slide horizontally on the lifting frame 5, thereby pushing out the workpiece 11 on the lifting frame 5.

[0024] Specifically, it includes a frame 1 and a conveyor frame 2 installed on the frame 1, wherein a supporting plate 3 is vertically slidably connected to the frame 1, and a processing unit for processing the workpiece 11 is installed on the supporting plate 3. Specifically, a servo mechanism is also provided between the processing unit and the supporting plate 3, which is used to control the multi-dimensional sliding of the processing unit on the supporting plate 3 to meet subsequent processing operations. A cylinder 4 is provided on the frame 1 for driving the supporting plate 3 to slide vertically, providing power for the vertical sliding of the supporting plate 3. A lifting frame 5 is vertically slidably connected inside the frame 1, and a lifting mechanism 8 is provided between the lifting frame 5 and the frame 1 for driving the lifting frame 5 to slide vertically. The lifting mechanism 8 is used to drive the lifting frame 5 to move upward, thereby facilitating the unloading of the workpiece 11 and meeting work needs. At the same time, the lifting mechanism 8 and the carrier plate 3 are intermittently connected through the linkage mechanism 7, which can achieve the lifting mechanism 8 being driven to move during the stroke in which the cylinder 4 drives the carrier plate 3 to return upward, so that the lifting mechanism 8 drives the lifting frame 5 to move upward, ejecting the workpiece 11 to a predetermined position to meet the working needs. Specifically, a pusher 6 is slidably connected to the lifting frame 5. When the lifting frame 5 slides upward, the pusher 6 is passively driven to slide horizontally on the lifting frame 5, thereby ejecting the workpiece 11 on the lifting frame 5. Therefore, during use, when the workpiece 11 needs to be processed, the workpiece 11 is installed in the processing groove, and then the carrier is driven to move downward to a predetermined position, and the processing unit is used to process the workpiece 11. After the processing of the workpiece 11 is completed, the cylinder 4 is needed to drive the carrier plate 3 to drive the processing unit to reset upward. During the upward reset stroke of the processing unit, the lifting mechanism 8 is driven to move through the linkage mechanism 7, and the lifting mechanism 8 drives the lifting frame 5 to move upward to transport the workpiece 11 to a predetermined position. Specifically, when the lifting mechanism 8 drives the lifting frame 5 to move upward, the lifting mechanism 8 is passively pushed through the pusher 6. During the sliding stroke on the frame 1, the workpiece 11 located on the lifting frame 5 is pushed out, so that the workpiece 11 can be unloaded. In this process, the lifting frame 5 is driven to move upward by the upward reset stroke of the supporting plate 3, and the unloading of the processed workpiece 11 is passively realized by the cooperation with the frame 1 during the upward movement of the lifting frame 5, which greatly improves the working efficiency of the unloading mechanism. Moreover, the mechanism is passively realized during the reset stroke of the supporting plate 3, and the unloading of the workpiece 11 can be realized without setting up a separate driving source. It can not only save energy, but also realize the continuity of the mechanism operation, and the use effect is better.

[0025] In the embodiment provided by the present invention, the lifting mechanism 8 includes a rotating rod 81 rotatably connected to the frame 1. An intermittent gear 83 is mounted on the rotating rod 81. A drive rack 82 is fixedly connected to the lifting frame 5 via an extension plate, with the intermittent gear 83 intermittently meshing with the drive rack 82. Multiple sets of return springs 84 are also interposed between the extension plate and the frame 1. The rotating rod 81 is rotatably connected to the frame 1, and the intermittent gear 83 is mounted on the rotating rod 81. Next, the extension plate is fixedly connected to the lifting frame 5, and the drive rack 82 is mounted on the extension plate, allowing intermittent meshing between the drive rack 82 and the intermittent gear 83. Furthermore, multiple sets of return springs 84 are installed between the extension plate and the frame 1 to reset the lifting frame 5 under certain conditions. When the intermittent gear 83 is not meshed with the drive rack 82, the elastic force of the return springs 84 returns the lifting frame 5 to its initial position, ready for the next loading and unloading operation.

[0026] In the embodiment provided by the present invention, the linkage mechanism 7 includes a first linkage rod 71 rotatably connected to the frame 1. A spur gear 72 is mounted on the first linkage rod 71, and a trigger rack 73 is mounted on the support plate 3, meshing with the spur gear 72. The trigger rack 73 meshes with the spur gear 72. A second linkage rod 75 is also rotatably connected to the frame 1. The second linkage rod 75 is transmission-connected to the first linkage rod 71 via a one-way transmission member 74. The second linkage rod 75 is transmission-connected to the rotation rod 81 via a synchronization unit 9. First, the first linkage rod 71 is rotationally connected to the frame 1, and the spur gear 72 is mounted thereon. The trigger rack 73 is then mounted on the support plate 3 and meshes with the spur gear 72. Consequently, when the support plate 3 changes position, the meshing of the trigger rack 73 and the spur gear 72 drives the first linkage rod 71 to rotate. Next, the second linkage rod 75 is rotatably connected to the frame 1 and is connected to the first linkage rod 71 via a one-way transmission member 74, so that the rotation of the first linkage rod 71 can be unidirectionally transmitted to the second linkage rod 75. Finally, the second linkage rod 75 is connected to the rotating rod 81 via the synchronization unit 9, achieving synchronous rotation of the second linkage rod 75 and the rotating rod 81, thereby driving the intermittent gear 83 to rotate and control the lifting and lowering of the lifting frame 5.

[0027] In the embodiments provided by the present invention, the one-way transmission unit includes a wedge-shaped plug rod 741 slidably connected to the second linkage rod 75. A slot 743 is formed in the first linkage rod 71, and a positioning spring 742 is arranged between the wedge-shaped plug rod 741 and the second linkage rod 75. The elastic force of the positioning spring 742 drives the wedge-shaped plug rod 741 to be clamped in the slot 743. The wedge-shaped plug rod 741 is slidably connected to the second linkage rod 75, the slot 743 is formed in the first linkage rod 71, and the positioning spring 742 is arranged between the wedge-shaped plug rod 741 and the second linkage rod 75, so that the elastic force of the positioning spring 742 always drives the wedge-shaped plug rod 741 to be clamped in the slot 743. When the first linkage rod 71 rotates clockwise, the wedge-shaped plug rod 741 slides out of the slot 743 under the action of force. At this time, the first linkage rod 71 is disconnected from the second linkage rod 75, that is, one-way transmission is realized; when the first linkage rod 71 rotates counterclockwise, the wedge-shaped plug rod 741 is clamped into the slot 743 under the action of the positioning spring 742, and the first linkage rod 71 and the second linkage rod 75 are linked, and the power is transmitted.

[0028] In the embodiments provided by the present invention, the pushing member includes a push plate 61 slidably connected to the lifting frame 5. A trigger rod 62 is fixedly connected to the push plate 61, and the trigger rod 62 is slidably connected to the lifting frame 5 through a chute 63. A wedge-shaped groove 64 is formed in an inclined shape on the frame 1, and the trigger rod 62 is intermittently abutted against the wedge-shaped groove 64; when the lifting frame 5 slides upward, the push plate 61 is driven to slide on the lifting frame 5 through the cooperation of the trigger rod 62 and the wedge-shaped groove 64, and the workpiece 11 is pushed out. The push plate 61 is slidably connected to the lifting frame 5, and the trigger rod 62 is fixedly connected to the push plate 61. The trigger rod 62 is slidably connected to the lifting frame 5 through the chute 63. At the same time, the wedge-shaped groove 64 is formed in an inclined shape on the frame 1, so that the trigger rod 62 and the wedge-shaped groove 64 can be intermittently abutted. When the lifting frame 5 slides upward, the trigger rod 62 slides along the wedge-shaped groove 64. Under the action of the inclined surface of the wedge-shaped groove 64, the trigger rod 62 drives the push plate 61 to slide on the lifting frame 5, so as to smoothly and accurately push the workpiece 11 out of the lifting frame 5, and complete the blanking operation of the workpiece 11.

[0029] In the embodiment provided by the present invention, a conveying plate 10 for conveying a workpiece 11 is also slidably connected to the conveying frame 2, and a conveying portion 14 for driving the conveying plate 10 to slide is provided on the frame 1. The conveying portion 14 is transmission-connected to the linkage mechanism 7. The conveying portion 14 includes a conveying screw 142 rotatably connected to the conveying frame 2, a screw sleeve 141 is fixed on the conveying plate 10, and the conveying screw 142 is threadedly connected to the screw sleeve 141; and a second bevel gear 142 is installed on the conveying screw 142, and a first bevel gear 143 is installed on the second linkage rod 75, and the first bevel gear 143 is meshed with the second bevel gear 142. The conveying screw 142 is rotatably connected to the conveying frame 2, and the screw sleeve 141 is fixedly connected to the conveying plate 10, so that the conveying screw 142 is threadedly connected to the screw sleeve 141. A second bevel gear 142 is mounted on the conveying screw 142, and a first bevel gear 143 is mounted on the second linkage rod 75, so that the first bevel gear 143 and the second bevel gear 142 mesh with each other. When the linkage mechanism 7 drives the second linkage rod 75 to rotate, the meshing of the first bevel gear 143 and the second bevel gear 142 drives the conveying screw 142 to rotate, thereby causing the conveying plate 10, which is threadedly connected to the conveying screw 142, to slide stably and accurately on the conveying frame 2, thereby conveying the workpiece 11.

[0030] In the embodiment provided by the present invention, a push slide 12 is slidably connected to the conveying plate 10 via a positioning portion, and an extrusion spring 13 is provided between the push slide 12 and the conveying plate 10; the positioning portion includes a positioning block fixedly connected to the push slide 12, and the positioning block is slidably connected to the conveying plate 10 via a positioning groove. The push slide 12 is slidably connected to the conveying plate 10 via the positioning portion, and an extrusion spring 13 is provided between the push slide 12 and the conveying plate 10. The specific structure of the positioning portion is: a positioning block fixedly connected to the push slide 12, and the positioning block is slidably connected to the conveying plate 10 via a positioning groove. When the workpiece 11 is placed on the conveying plate 10, under the elastic force of the extrusion spring 13, the push slide 12 can play a certain clamping and fixing role on the workpiece 11, preventing the workpiece 11 from being displaced during the conveying process, ensuring the conveying accuracy and stability of the workpiece 11, and facilitating subsequent loading and unloading operations.

[0031] In the embodiment provided by the present invention, a discharging part for driving the workpiece 11 to unload from the conveying plate 10 is further arranged on the rack 1. The discharging part includes a discharging plate 15 slidably connected to the rack 1, and an installation spring 16 is further arranged between the discharging plate 15 and the rack 1; a triggering surface 18 is formed on the discharging plate 15, and a buffer pad 17 is arranged on the side of the discharging plate 15 away from the triggering surface 18. The discharging plate 15 is slidably connected to the rack 1, and the installation spring 16 between the discharging plate 15 and the rack 1 is provided to provide a certain elastic acting force. The triggering surface 18 is formed on the discharging plate 15. When the workpiece 11 contacts the triggering surface 18, through a certain mechanical transmission, the discharging plate 15 slides on the rack 1 to complete the discharging operation of the workpiece 11. At the same time, the buffer pad 17 is arranged on the side of the discharging plate 15 away from the triggering surface 18. During the unloading process of the workpiece 11, the buffer pad 17 can effectively reduce the collision impact between the workpiece 11 and the edge of the discharging plate 15 or other components such as the rack 1, playing a buffering and protecting role, avoiding damage to the workpiece 11, and improving the integrity and safety of the workpiece 11.

[0032] It should be noted that the electrical equipment and the like involved in this application can be powered by a storage battery or an external power supply.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, terms such as "installation", "provided with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An up-and-down feeding mechanism for a machining center, comprising a machine frame (1) and a conveying frame (2) mounted on the machine frame (1). A bearing plate (3) is vertically slidably connected to the machine frame (1), and a machining unit for machining a workpiece (11) is mounted on the bearing plate (3). It is characterized in that: A cylinder (4) for driving the vertical sliding of the bearing plate (3) is provided on the machine frame (1); A lifting frame (5) is vertically slidably connected inside the machine frame (1), and a lifting mechanism (8) for driving the vertical sliding of the lifting frame (5) is provided between the lifting frame (5) and the machine frame (1), and the lifting mechanism (8) is intermittently drivingly connected to the bearing plate (3) through a linkage mechanism (7); A pusher (6) is slidably connected to the lifting frame (5); During the upward sliding stroke of the lifting frame (5), the pusher (6) is passively driven to horizontally slide on the lifting frame (5) to push out the workpiece (11) on the lifting frame (5).

2. The loading and unloading mechanism of a machining center according to claim 1, characterized in that: The lifting mechanism (8) includes a rotating rod (81) rotatably connected to the machine frame (1), an intermittent gear (83) is mounted on the rotating rod (81), and a driving rack (82) is fixedly connected to the lifting frame (5) through an extension plate. The intermittent gear (83) is intermittently engaged with the driving rack (82); A plurality of reset springs (84) are further provided between the extension plate and the machine frame (1).

3. The loading and unloading mechanism of a machining center according to claim 2, characterized in that: The linkage mechanism (7) includes a first linkage rod (71) rotatably connected to the machine frame (1), a spur gear (72) is mounted on the first linkage rod (71), and a trigger rack (73) engaged with the spur gear (72) is mounted on the bearing plate (3). The trigger rack (73) is engaged with the spur gear (72); A second linkage rod (75) is also rotatably connected to the machine frame (1), and the second linkage rod (75) is drivingly connected to the first linkage rod (71) through a one-way transmission member (74); The second linkage rod (75) is drivingly connected to the rotating rod (81) through a synchronization unit (9).

4. The loading and unloading mechanism of a machining center according to claim 3, characterized in that: The one-way transmission unit includes a wedge-shaped insertion rod (741) slidably connected to the second linkage rod (75). A slot (743) is formed on the first linkage rod (71), and a positioning spring (742) is provided between the wedge-shaped insertion rod (741) and the second linkage rod (75). The elastic force of the positioning spring (742) drives the wedge-shaped insertion rod (741) to be clamped in the slot (743).

5. The loading and unloading mechanism of a machining center according to claim 2, characterized in that: The pusher includes a push plate (61) slidably connected to the lifting frame (5), a trigger rod (62) is fixedly connected to the push plate (61), and the trigger rod (62) is slidably connected to the lifting frame (5) through a chute (63). A wedge-shaped groove (64) in an inclined shape is formed on the machine frame (1), and the trigger rod (62) intermittently abuts against the wedge-shaped groove (64); When the lifting frame (5) slides upward, the push plate (61) is driven to slide on the lifting frame (5) through the cooperation of the trigger rod (62) and the wedge-shaped groove (64) to push out the workpiece (11).

6. The loading and unloading mechanism of a machining center according to claim 3, characterized in that: The conveying frame (2) is also slidably connected to a conveying plate (10) for conveying workpieces (11), and the frame (1) is provided with a conveying portion (14) for driving the conveying plate (10) to slide, and the conveying portion (14) is transmission-connected to the linkage mechanism (7).

7. The loading and unloading mechanism of a machining center according to claim 6, characterized in that: The conveying portion (14) includes a conveying screw (142) rotatably connected to the conveying frame (2); a screw sleeve (141) is fixed on the conveying plate (10); the conveying screw (142) is threadedly connected to the screw sleeve (141); a second bevel gear (142) is installed on the conveying screw (142); and a first bevel gear (143) is installed on the second linkage rod (75); the first bevel gear (143) is meshed with the second bevel gear (142).

8. The loading and unloading mechanism of a machining center according to claim 6, characterized in that: A pushing slide plate (12) is slidably connected to the conveying plate (10) via a positioning portion, and a compression spring (13) is provided between the pushing slide plate (12) and the conveying plate (10); The positioning portion comprises a positioning block fixedly connected to the pushing slide plate (12), and the positioning block is slidably connected to the conveying plate (10) via a positioning groove.

9. The loading and unloading mechanism of a machining center according to claim 7, characterized in that: The frame (1) is also provided with a discharge portion for driving the workpiece (11) to be discharged from the conveying plate (10).

10. The loading and unloading mechanism of a machining center according to claim 9, characterized in that: The discharge portion comprises a discharge plate (15) slidably connected to the frame (1), and a mounting spring (16) is further provided between the discharge plate (15) and the frame (1); A trigger surface (18) is provided on the discharge plate (15), and a buffer pad (17) is provided on a side of the discharge plate (15) away from the trigger surface (18).

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