A vertical machining center machine tool

Abstract

The present invention relates to the field of mechanical manufacturing technology, and specifically discloses a vertical machining center machine tool, comprising a machine tool body, a workpiece seat fixedly arranged on a workpiece table on the machine tool body, at least two positioning bars fixedly arranged on the workpiece seat, an up and down moving drive device comprising a connecting frame, a telescopic driving device fixedly arranged on the connecting frame, a movable frame fixedly arranged at the movable end of the telescopic driving device, and two top surface grabbing devices respectively located above the two sides of the workpiece seat; the vertical machining center machine tool of the present invention can control the telescopic driving device to drive the top surface grabbing device to move up and down, and the top surface grabbing device can absorb the machining top surface of the workpiece when moving down, and can lift the workpiece when the top surface grabbing device moves up, so that the machining top surface of the workpiece is pressed against the limiting surface of the positioning bar, so that the machining top surface of the workpiece becomes horizontal, so that the machining top surface of the workpiece is kept perpendicular to the tool, thereby preventing cutting deviation, thereby improving cutting accuracy and improving workpiece quality.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a vertical machining center machine tool. Background Art

[0002] A vertical machining center is a machine tool whose main axis is perpendicular to the workpiece table. It is mainly suitable for processing complex parts such as plates, discs, molds and small shells. It can complete milling, drilling and tapping processes. A vertical machining center is at least three-axis two-linkage, and generally can achieve three-axis three-linkage. Some can perform five-axis or six-axis control. The workpiece of the vertical machining center is easy to clamp, the tool movement trajectory is easy to observe, and the debugging program is easy to check and measure, so problems can be discovered in time.

[0003] When a current vertical machining center machine tool processes a workpiece, it generally places the workpiece on a workpiece table with the surface to be processed facing upward and facing the tool, then clamps and fixes the side of the workpiece, and finally cuts the top surface of the workpiece.

[0004] However, the above method is suitable for machining workpieces whose top and bottom surfaces are parallel to each other. Figure 1 As shown, if the top surface 71 and the bottom surface 72 of the workpiece 70 are not parallel due to the shape of the workpiece 70 itself or the low processing accuracy of the top surface and the bottom surface of the workpiece 70, when the bottom surface 72 of the workpiece 70 is placed on the horizontal worktable 80, the top surface 71 of the workpiece 70 is not horizontal. The processed top surface 71 of the workpiece 70 is not perpendicular to the tool 90, which will cause cutting deviation, seriously reduce the cutting accuracy, and cause the workpiece quality to decline. Summary of the invention

[0005] The present invention provides a vertical machining center machine tool, aiming to solve the problem in the related art that the vertical machining center machine tool cannot ensure that the machining top surface of the workpiece is perpendicular to the tool, which will cause cutting deviation and affect the cutting accuracy.

[0006] The vertical machining center machine tool of the present invention comprises a machine tool body, the machine tool body has a workpiece table, and further comprises:

[0007] A workpiece seat is fixedly mounted on the workpiece table of the machine tool body for placing the workpiece;

[0008] At least two positioning bars are fixedly mounted on the workpiece seat, each of the positioning bars has a limiting surface, and the limiting surface is a horizontal surface;

[0009] The up-and-down moving driving device comprises a connecting frame fixedly mounted on the workpiece table of the machine tool body, a telescopic driving device is fixedly mounted on the connecting frame, and a moving frame is fixedly mounted on the movable end of the telescopic driving device;

[0010] Two top surface grabbing devices are respectively located above the two sides of the workpiece seat, and each of the top surface grabbing devices includes an elastic telescopic part fixedly mounted on the movable frame, a grabbing frame is fixedly mounted on the elastic telescopic part, and a suction device is installed on the grabbing frame, and the suction device can suck the processed top surface of the workpiece.

[0011] The workpiece is placed on the workpiece seat with the processed top surface facing upwards, and the telescopic driving device is controlled to contract to drive the top surface grasping device to move downwards through the moving frame, so that the suction device can contact the processed top surface of the workpiece, and then the suction device is controlled to adsorb the processed top surface of the workpiece, and then the telescopic driving device is controlled to extend to drive the top surface grasping device to move upwards through the moving frame, so that the workpiece adsorbed on the suction device can be lifted up until the processed top surface of the workpiece contacts and presses against the limiting surface on the limiting part, so that the processed top surface of the workpiece becomes horizontal under the guidance of the limiting surface, and the telescopic driving device is continued to be controlled to extend to force the elastic telescopic part to extend through the moving frame, and the elastic force of the elastic telescopic part can keep the processed top surface of the workpiece close to the limiting surface, so as to keep the processed top surface of the workpiece in a horizontal state.

[0012] Preferably, the workpiece seat comprises a bearing plate, the top surface of the bearing plate is a horizontal plane, a connecting block is fixedly provided at the bottom of the bearing plate, and the connecting block is fixedly provided on the workpiece table of the machine tool body.

[0013] Preferably, the number of the positioning bars is four, and the four positioning bars are arranged in groups of two. The two groups of positioning bars are respectively fixed on both sides of the supporting plate, and the two positioning bars in each group are arranged in an "eight" shape.

[0014] Preferably, the positioning bar has a connecting portion and a limiting portion connected to the connecting portion, the connecting portion is fixed on the upper surface of the supporting plate, and the height of the connecting portion is greater than the height of the workpiece, and the limiting surface is arranged at the bottom of the limiting portion.

[0015] Preferably, the elastic telescopic member includes a third sleeve rod, the top of the third sleeve rod is fixed on the movable frame, the outer surface of the third sleeve rod is slidably connected with a third sleeve, an elastic member is fixed between the inner wall of the third sleeve and the third sleeve rod, and the bottom of the third sleeve is fixed on the grabbing frame.

[0016] Preferably, the suction device comprises a conversion tube and at least two suction cups, both of which are fixed on the grabbing frame, each of the suction cups is connected to the conversion tube through an air pipe, and the conversion tube is connected to a negative pressure pump through the air pipe.

[0017] Preferably, it also includes a clamping mechanism;

[0018] The clamping mechanism includes a driving mechanism and four guide grooves opened on the supporting plate, the four guide grooves are evenly distributed around the center position of the supporting plate, each of the guide grooves is slidably connected with a clamping member in a single degree of freedom, the driving mechanism is connected to each clamping member, and the driving mechanism can drive each clamping member to move along the guide groove.

[0019] Preferably, each of the clamping members includes a clamping block and a limiting block, the bottom of the clamping block is slidably connected to the upper surface of the supporting plate, the clamping block has an inclined surface, and the inclined surface gradually approaches the center position of the supporting plate from top to bottom, the cross-section of the inclined surface is arc-shaped, the limiting block is T-shaped, and the limiting block is fixed to the bottom of the clamping block after passing through the guide groove.

[0020] Preferably, the driving mechanism includes a first telescopic member and four second telescopic members, the first telescopic member is fixed on a connecting frame, the movable end of the first telescopic member is fixedly connected to a movable frame, the four second telescopic members are all fixed on a workpiece seat, the movable ends of the four second telescopic members are respectively fixedly connected to four limiting blocks one by one, and the first telescopic member and the four second telescopic members are transmission connected.

[0021] Preferably, the first telescopic member comprises a first sleeve fixedly mounted on the connecting frame, the inner wall of the first sleeve is sealed and slidably connected with a first piston, a cavity enclosed between the first sleeve and the first piston contains hydraulic medium, a first set of rods is fixedly mounted on the first piston, and the first set of rods is fixedly mounted on the moving frame;

[0022] The second telescopic member includes a second sleeve fixedly mounted on the workpiece seat, the inner wall of the second sleeve is sealed and slidably connected with a second piston, the cavity enclosed between the second sleeve and the second piston contains hydraulic medium, the hydraulic medium in the second sleeve and the hydraulic medium in the first sleeve are connected to each other through a pipeline, a second sleeve rod is fixedly mounted on the second piston, and the second sleeve rod is fixedly mounted on the limiting block.

[0023] The beneficial effect of the present invention is that when in use, the workpiece is placed on the workpiece seat with the machined top surface facing upwards, and the telescopic driving device is controlled to retract to drive the top surface grasping device to move downwards through the moving frame, so that the suction device can contact the machined top surface of the workpiece, and then the suction device is controlled to adsorb the machined top surface of the workpiece, and then the telescopic driving device is controlled to extend to drive the top surface grasping device to move upwards through the moving frame, so that the workpiece adsorbed on the suction device can be lifted up until the machined top surface of the workpiece contacts and presses against the limiting surface on the limiting part, so that the machined top surface of the workpiece becomes horizontal under the guidance of the limiting surface, and the telescopic driving device is continued to be controlled to extend to force the elastic telescopic part to extend through the moving frame, and the elastic force of the elastic telescopic part can keep the machined top surface of the workpiece close to the limiting surface, and keep the machined top surface of the workpiece in a horizontal state, so that the machined top surface of the workpiece is kept perpendicular to the tool, thereby preventing cutting deviation, thereby improving cutting accuracy and improving workpiece quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the prior art in the present invention.

[0025] Figure 2 It is a schematic structural diagram of the first embodiment of the present invention.

[0026] Figure 3 It is a schematic structural diagram of a workpiece seat, a positioning bar, an up and down moving driving device and a top surface grabbing device in the first embodiment of the present invention.

[0027] Figure 4 It is a schematic structural diagram of a workpiece seat and a positioning bar in the first embodiment of the present invention.

[0028] Figure 5 It is a schematic structural diagram of the top surface grasping device of the first embodiment of the present invention.

[0029] Figure 6 It is a cross-sectional view of the elastic stretchable member according to the first embodiment of the present invention.

[0030] Figure 7 It is a structural schematic diagram of the top surface grasping device of the first embodiment of the present invention in the state of lifting a workpiece.

[0031] Figure 8 It is a schematic structural diagram of the second embodiment of the present invention.

[0032] Fig. 9 It is a schematic structural diagram of the clamping mechanism of the second embodiment of the present invention.

[0033] Fig.10 It is a schematic structural diagram of the driving mechanism of the second embodiment of the present invention.

[0034] Fig.11It is a schematic structural diagram of a second sleeve, a second sleeve rod and a clamping member in a second embodiment of the present invention.

[0035] Fig.12 It is a structural schematic diagram of the clamping block of the second embodiment of the present invention clamping a workpiece.

[0036] Reference numerals:

[0037] 10. Machine tool body; 20. Workpiece seat; 21. Loading plate; 22. Connecting block; 30. Positioning strip; 31. Connecting part; 32. Limiting part; 33. Limiting surface; 40. Up and down moving drive device; 41. Connecting frame; 42. Telescopic drive device; 43. Moving frame; 50. Top surface grabbing device; 51. Elastic telescopic member; 511. Third set of rods; 512. Third sleeve; 513. Elastic member; 52. Grabbing frame; 521. Upper Connecting plate; 522, connecting frame; 523, lower connecting plate; 53, suction device; 531, conversion tube; 532, suction cup; 60, clamping mechanism; 61, driving mechanism; 611, first sleeve; 612, first piston; 613, first set of rods; 614, second sleeve; 615, second piston; 616, second set of rods; 62, guide groove; 63, clamping member; 631, clamping block; 6311, inclined surface; 632, limiting block. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0039] refer to Figures 2 to 7 As shown, the first embodiment of the vertical machining center machine tool of the present invention mainly includes a machine tool body 10, the machine tool body 10 is provided with a workpiece table, a workpiece seat 20 is fixedly installed on the workpiece table on the machine tool body 10, the workpiece can be placed on the workpiece seat 20, at least two positioning strips 30 are fixedly installed on the workpiece seat 20, an up and down moving drive device 40 is installed on the workpiece table on the machine tool body 10, two top surface grasping devices 50 are fixedly installed on the movable end of the up and down moving drive device 40, the two top surface grasping devices 50 can grasp the workpiece, the up and down moving drive device 40 can drive each top surface grasping device 50 to move up and down, and can drive the workpiece to fit on each positioning strip 30.

[0040] refer to Figures 2 to 4As shown, the workpiece seat 20 includes a supporting plate 21, the top surface of the supporting plate 21 is a horizontal plane, and the workpiece to be processed can be placed on the top surface of the supporting plate 21. In the present embodiment, the supporting plate 21 is shaped like a "cross" to reduce the space occupied by the supporting plate 21. A connecting block 22 is welded to the bottom of the supporting plate 21, and the connecting block 22 is fixedly connected to the workpiece table of the machine tool body 10 to support the supporting plate 21.

[0041] refer to Figures 2 to 4 As shown, each positioning bar 30 is welded on the carrier plate 21. In the present embodiment, the number of the positioning bars 30 is four, and the four positioning bars 30 are grouped in pairs. The two groups of positioning bars 30 are respectively welded on both sides of the carrier plate 21, and the two positioning bars 30 on each group are arranged in an "eight" shape. In the present embodiment, each positioning bar 30 is L-shaped, and the positioning bar 30 includes a connecting portion 31 and a limiting portion 32 connected to the connecting portion 31. The connecting portion 31 is welded on the upper surface of the carrier plate 21, and the height of the connecting portion 31 is greater than the height of the workpiece, so that the workpiece can be placed between the upper surface of the carrier plate 21 and the limiting portion 32. The bottom of the limiting portion 32 has a limiting surface 33, and the limiting surface 33 is a horizontal surface. The upward movement of the workpiece can make the machined top surface of the workpiece fit on the limiting surface 33. Since the limiting surface 33 is a horizontal surface, under the guidance of the limiting surface 33, the machined top surface of the workpiece can be forced to be adjusted to a horizontal state.

[0042] refer to Figure 2 and Figure 3 As shown, the up and down moving drive device 40 includes a connecting frame 41, which is welded to the workpiece table of the machine tool body 10, and a telescopic drive device 42 is fixedly installed on the connecting frame 41. In this embodiment, the telescopic drive device 42 is a hydraulic cylinder. In other embodiments, the telescopic drive device 42 can be replaced by a cylinder or an electric telescopic rod. The movable end of the telescopic drive device 42 is fixedly connected to a moving frame 43 for connecting two top surface grasping devices 50.

[0043] refer to Figure 2 , Figure 3 , Figures 5 to 7 As shown, the two top surface grasping devices 50 are respectively located above the two sides of the supporting plate 21, and each top surface grasping device 50 includes an elastic telescopic member 51, which can be retracted and retracted. The top of the elastic telescopic member 51 is fixedly connected to the moving frame 43, and the bottom of the elastic telescopic member 51 is fixedly connected to a grasping frame 52, on which a suction device 53 is installed. The suction device 53 can adsorb the processed top surface of the workpiece, and the moving frame 43 can move up and down to drive the grasping frame 52 to move synchronously through the elastic telescopic member 51, and the movement of the grasping frame 52 can drive the suction device 53 to move synchronously.

[0044] Controlling the top surface grasping device 50 to move downward can make the suction device 53 contact the machined top surface of the workpiece, and then controlling the suction device 53 to adsorb the machined top surface of the workpiece, and then controlling the top surface grasping device 50 to move upward can lift the workpiece adsorbed on the suction device 53 until the machined top surface of the workpiece contacts and presses against the limiting surface 33 on the limiting portion 32, so that the machined top surface on the workpiece becomes horizontal under the guidance of the limiting surface 33.

[0045] Exemplarily, the elastic telescopic member 51 includes a third rod 511, the top of the third rod 511 is welded to the movable frame 43, the outer surface of the third rod 511 is slidably connected to the third sleeve 512, and an elastic member 513 is fixedly connected between the inner wall of the third sleeve 512 and the third rod 511. In this embodiment, the elastic member 513 is a tension spring, and the bottom of the third sleeve 512 is welded to the grabbing frame 52. The third rod 511 can overcome the elastic force of the elastic member 513 and slide in the third sleeve 512 to realize the telescopic function of the elastic telescopic member 51.

[0046] It should be noted that when the top surface grabbing device 50 is driven to move downward, the suction device 53 on the top surface grabbing device 50 will first contact the workpiece and stop moving downward, and then the force driving the top surface grabbing device 50 to move downward will force the third set rod 511 to compress the elastic member 513, and make the third set rod 511 slide in the third sleeve 512, so that the elastic telescopic member 51 is in a contracted state as a whole. On the one hand, the contraction of the elastic telescopic member 51 can relieve the downward pressure of the top surface grabbing device 50, and on the other hand, the contraction of the elastic telescopic member 51 can prevent the driving force of the top surface grabbing device 50 from crushing the top surface grabbing device 50 and the workpiece. Secondly, the elastic force of the elastic member 513 will eventually drive the suction device 53 to keep close to the workpiece through the grabbing frame 52; when the top surface grabbing device 50 is driven to move upward, the top surface grabbing device 5 0 The adsorbed workpiece will first contact the limiting surface 33 on the limiting portion 32 and stop moving upward. Subsequently, the force driving the top surface grabbing device 50 to continue moving upward will force the third set rod 511 to stretch the elastic member 513, and make the third set rod 511 slide in the third sleeve 512, so that the elastic telescopic member 51 is in a stretched state as a whole. On the one hand, the stretching of the elastic telescopic member 51 can release the upward pulling force of the top surface grabbing device 50. On the other hand, the stretching of the elastic telescopic member 51 can prevent the driving force of the top surface grabbing device 50 from damaging the top surface grabbing device 50 and the positioning bar 30. Secondly, the elastic force of the elastic member 513 will also drive the workpiece to move upward through the grabbing frame 52 and the suction device 53, so as to keep the processed top surface of the workpiece close to the limiting surface 33 on the limiting portion 32, so that the processed top surface of the workpiece remains in a horizontal state.

[0047] Exemplarily, the grab frame 52 includes an upper connecting plate 521 welded to the bottom of the third sleeve 512, at least two connecting frames 522 are welded to the lower surface of the upper connecting plate 521, and the bottom of each connecting frame 522 is welded to a lower connecting plate 523. The suction device 53 includes a conversion tube 531 and at least two suction cups 532. The conversion tube 531 is welded to each connecting frame 522, and each suction cup 532 is fixedly connected to the lower connecting plate 523, and each suction cup 532 is evenly distributed on the lower connecting plate 523. Each suction cup 532 is connected to the conversion tube 531 through an air pipe. The air hole of the conversion tube 531 is connected to the negative pressure pump through the air pipe, and the negative pressure pump is installed in the machine tool body 10. After the suction cup 532 on the suction device 53 contacts the workpiece, the negative pressure pump is controlled to evacuate air from the suction cup 532 through the conversion tube 531 and the air pipe, so that the suction cup 532 is adsorbed on the processing top surface of the workpiece to achieve the connection between the top surface grasping device 50 and the workpiece; the negative pressure pump is controlled to inflate air in the suction cup 532 through the conversion tube 531 and the air pipe, so that the suction cup 532 is separated from the processing top surface of the workpiece to achieve the separation of the top surface grasping device 50 from the workpiece.

[0048] When in use, the workpiece is placed on the upper surface of the carrying plate 21 with the processed top surface facing upwards, and the telescopic driving device 42 is controlled to contract to drive the top surface grasping device 50 to move downwards through the moving frame 43, so that the suction device 53 can contact the processed top surface of the workpiece, and then the suction device 53 is controlled to absorb the processed top surface of the workpiece; then the telescopic driving device 42 is controlled to extend through the moving frame 43 to drive the top surface grasping device 50 to move upwards, and at the same time, the workpiece absorbed on the suction device 53 can be lifted up until the processed top surface on the workpiece contacts and presses against the limiting surface 33 on the limiting portion 32, as shown in FIG. Figure 7 As shown, the machined top surface of the workpiece is finally made horizontal under the guidance of the limiting surface 33. Continuing to control the extension of the telescopic drive device 42 can force the elastic telescopic member 51 to extend through the movable frame 43. The elastic force of the elastic telescopic member 51 can keep the machined top surface of the workpiece close to the limiting surface 33.

[0049] In the above embodiment, the workpiece is fixed mainly by the suction force of the suction device 53 on the workpiece and the friction between the workpiece and the positioning bar 30. Its fixing ability is weak and the workpiece may fall off the suction device 53. Therefore, a second embodiment is proposed to strengthen the fixing force of the workpiece to overcome the above problem.

[0050] like Figures 8 to 12 FIG. 2 shows a second embodiment of the vertical machining center machine tool of the present invention. The difference from the first embodiment is that the second embodiment further includes a clamping mechanism 60 .

[0051] refer to Figure 8As shown, the clamping mechanism 60 includes a driving mechanism 61 and four guide grooves 62 opened on the supporting plate 21, the four guide grooves 62 are evenly distributed around the center position of the supporting plate 21, and the four guide grooves 62 are all connected with clamping members 63 in a single-degree-of-freedom sliding manner. The four clamping members 63 are also evenly distributed around the center position of the supporting plate 21. The driving mechanism 61 can drive each clamping member 63 to move so that all the clamping members 63 are close to each other or away from each other. All the clamping members 63 can be close to the four sides of the workpiece when they are close to each other to achieve clamping of the workpiece; all the clamping members 63 can be away from the workpiece when they are away from each other to achieve loosening of the workpiece.

[0052] refer to Fig. 9 and Fig.11 As shown, each clamping member 63 includes a clamping block 631 and a limiting block 632. The bottom of the clamping block 631 is slidably connected to the upper surface of the carrier plate 21. The side of the clamping block 631 close to the center of the carrier plate 21 is an inclined surface 6311, and the inclined surface 6311 gradually approaches the center of the carrier plate 21 from top to bottom. The cross section of the inclined surface 6311 is an arc. The limiting block 632 is T-shaped, and the limiting block 632 passes through the guide groove 62 and is welded to the bottom of the clamping block 631, so that the entire clamping member 63 is limited to slide in a single degree of freedom direction in the guide groove 62. The driving mechanism 61 is connected to the four limiting blocks 632 and can drive the four limiting blocks 632 to move.

[0053] refer to Fig. 9 and Fig.10 As shown, the driving mechanism 61 includes a first telescopic member and four second telescopic members, the four second telescopic members correspond one to one with four limiting blocks 632, the movable end of the first telescopic member is fixedly connected to the movable frame 43, the movable end of the second telescopic member is fixedly connected to the limiting block 632, the first telescopic member and the four second telescopic members both have hydraulic medium, and the hydraulic medium in the first telescopic member and the hydraulic medium in the four second telescopic members are connected through pipelines.

[0054] The first telescopic member includes a first sleeve 611 fixedly connected to the connecting frame 41, the inner wall of the first sleeve 611 is sealed and slidably connected with a first piston 612, the edge of the first piston 612 is made of elastic rubber material, so that the edge of the first piston 612 can abut against the inner wall of the first sleeve 611 to maintain the seal between the first piston 612 and the first sleeve 611, and the cavity enclosed by the inner wall of the first sleeve 611 and the first piston 612 contains hydraulic medium. In this embodiment, the hydraulic medium is hydraulic oil, and the first piston 612 is fixedly connected to the first rod 613, and the first rod 613 is fixedly connected to the moving frame 43.

[0055] The second telescopic member includes a second sleeve 614 fixedly connected to the bottom of the bearing plate 21, the inner wall of the second sleeve 614 is sealed and slidably connected with a second piston 615, the edge of the second piston 615 is made of elastic rubber material, so that the edge of the second piston 615 can abut against the inner wall of the second sleeve 614 to maintain the seal between the second piston 615 and the second sleeve 614, and the cavity surrounded by the inner wall of the second sleeve 614 and the second piston 615 contains hydraulic medium. In this embodiment, the hydraulic medium is hydraulic oil, the second sleeve 614 and the first sleeve 611 are connected by a pipeline, and the hydraulic medium in the second sleeve 614 can be connected with the hydraulic medium in the first sleeve 611 through the pipeline, so that the hydraulic medium between the two can flow to each other, and the second piston 615 is fixedly connected to the second rod 616, and the second rod 616 is fixedly connected to the limiting block 632.

[0056] After the machined top surface of the workpiece is in close contact with the limit surface 33, the telescopic drive device 42 is continuously controlled to extend, so that the elastic telescopic member 51 can be forced to extend through the movable frame 43. At the same time, the upward movement of the movable frame 43 will drive the first piston 612 of the first telescopic member to retract into the first sleeve 611. The hydraulic medium in the first sleeve 611 is pressed into the four second sleeves 614 through the pipeline. The hydraulic medium entering each second sleeve 614 will push the second piston 615 to move. The movement of the second piston 615 drives the second sleeve rod 616 to move to extend out of the second sleeve 614. The movement of the second sleeve rod 616 drives the limiting block 632 to move. The movement of the limiting block 632 drives the clamping block 631 to press against the workpiece. Fig.12 Conversely, if the telescopic drive device 42 is controlled to contract, negative pressure is formed in the first sleeve 611, and the hydraulic medium in the four second sleeves 614 can be drawn back into the first sleeve 611, so that the four clamping members 63 move away from each other to release the clamping of the workpiece.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A vertical machining center machine tool, comprising a machine tool body, wherein the machine tool body has a workpiece table, characterized in that: Also includes: A workpiece seat is fixedly mounted on the workpiece table of the machine tool body for placing the workpiece with the top surface facing upward; At least two positioning bars are fixedly mounted on the workpiece seat, each of the positioning bars has a limiting surface, and the limiting surface is a horizontal surface; The up-and-down moving driving device comprises a connecting frame fixedly mounted on the workpiece table of the machine tool body, a telescopic driving device is fixedly mounted on the connecting frame, and a moving frame is fixedly mounted on the movable end of the telescopic driving device; Two top surface grabbing devices are respectively located above the two sides of the workpiece seat, each of the top surface grabbing devices comprises an elastic telescopic member fixedly mounted on the movable frame, a grabbing frame is fixedly mounted on the elastic telescopic member, a suction device is installed on the grabbing frame, and the suction device can adsorb the processed top surface of the workpiece; Controlling the telescopic drive device to retract can drive the top surface grasping device to move downward through the mobile frame, so that the suction device contacts the machined top surface of the workpiece; controlling the suction device to adsorb the machined top surface of the workpiece; controlling the telescopic drive device to extend can drive the top surface grasping device to move upward through the mobile frame, and can lift the workpiece adsorbed on the suction device until the machined top surface of the workpiece is pressed against the limit surface, so as to force the machined top surface of the workpiece to become horizontal under the guidance of the limit surface; continuing to control the telescopic drive device to extend can force the elastic telescopic part to extend through the mobile frame, and the elastic force of the elastic telescopic part can keep the machined top surface of the workpiece close to the limit surface, so as to keep the machined top surface of the workpiece in a horizontal state.

2. The vertical machining center machine tool according to claim 1, characterized in that: The workpiece seat comprises a bearing plate, the top surface of the bearing plate is a horizontal plane, a connecting block is fixedly arranged at the bottom of the bearing plate, and the connecting block is fixedly arranged on the workpiece table of the machine tool body.

3. The vertical machining center machine tool according to claim 2, characterized in that: The number of the positioning bars is four, and the four positioning bars are arranged in groups of two. The two groups of positioning bars are respectively fixed on both sides of the bearing plate, and the two positioning bars in each group are arranged in an "eight" shape.

4. The vertical machining center machine tool according to claim 3, characterized in that: The positioning bar has a connecting portion and a limiting portion connected to the connecting portion. The connecting portion is fixed on the upper surface of the supporting plate, and the height of the connecting portion is greater than the height of the workpiece. The limiting surface is arranged at the bottom of the limiting portion.

5. The vertical machining center machine tool according to claim 1, characterized in that: The elastic telescopic member includes a third sleeve rod, the top of the third sleeve rod is fixed on the moving frame, the outer surface of the third sleeve rod is slidably connected with a third sleeve, an elastic member is fixed between the inner wall of the third sleeve and the third sleeve rod, and the bottom of the third sleeve is fixed on the grabbing frame.

6. The vertical machining center machine tool according to claim 1, characterized in that: The suction device comprises a conversion tube and at least two suction cups which are fixedly mounted on the grabbing frame, each of the suction cups is connected to the conversion tube through an air pipe, and the conversion tube is connected to a negative pressure pump through the air pipe.

7. The vertical machining center machine tool according to claim 2, characterized in that: Also included is a clamping mechanism; The clamping mechanism includes a driving mechanism and four guide grooves opened on the supporting plate, the four guide grooves are evenly distributed around the center position of the supporting plate, each of the guide grooves is slidably connected with a clamping member in a single degree of freedom, the driving mechanism is connected to each clamping member, and the driving mechanism can drive each clamping member to move along the guide groove.

8. The vertical machining center according to claim 7, characterized in that: Each of the clamping members includes a clamping block and a limiting block. The bottom of the clamping block is slidably connected to the upper surface of the supporting plate. The clamping block has an inclined surface, and the inclined surface gradually approaches the center position of the supporting plate from top to bottom. The cross-section of the inclined surface is arc-shaped. The limiting block is T-shaped, and the limiting block is fixed to the bottom of the clamping block after passing through the guide groove.

9. The vertical machining center according to claim 8, characterized in that: The driving mechanism includes a first telescopic member and four second telescopic members, the first telescopic member is fixed on the connecting frame, the movable end of the first telescopic member is fixedly connected to the moving frame, the four second telescopic members are all fixed on the workpiece seat, the movable ends of the four second telescopic members are respectively fixedly connected to four limiting blocks one by one, and the first telescopic member and the four second telescopic members are transmission connected.

10. The vertical machining center according to claim 9, characterized in that: The first telescopic member comprises a first sleeve fixedly mounted on the connecting frame, the inner wall of the first sleeve is sealed and slidably connected with a first piston, a cavity enclosed between the first sleeve and the first piston contains a hydraulic medium, a first rod is fixedly mounted on the first piston, and the first rod is fixedly mounted on the moving frame; The second telescopic member includes a second sleeve fixedly mounted on the workpiece seat, the inner wall of the second sleeve is sealed and slidably connected with a second piston, the cavity enclosed between the second sleeve and the second piston contains hydraulic medium, the hydraulic medium in the second sleeve and the hydraulic medium in the first sleeve are connected to each other through a pipeline, a second sleeve rod is fixedly mounted on the second piston, and the second sleeve rod is fixedly mounted on the limiting block.

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