A rapid tool changing engraving and milling machine

Abstract

The utility model discloses a can realize quick tool changing's engraving machine, including base and setting the rack of base top surface, the rack top forms the crossbeam, the base top surface removal is provided with the workstation below the crossbeam, the crossbeam side wall removal is provided with X axle drive mechanism, removal is provided with Z axle drive mechanism on X axle drive mechanism, is provided with the main shaft and the cutter of installing in the main shaft bottom on Z axle drive mechanism, the crossbeam bottom is provided with the tool magazine, the tool magazine includes the upper fixed plate of fixed on the crossbeam, the upper casing of connection in the upper fixed plate front end, the lower casing of hinged in the upper casing bottom, the sliding plate of removal setting in the upper fixed plate bottom and the tool holder of connection in the sliding plate front end. The utility model discloses the cooperation of tool magazine and X axle drive mechanism, Z axle drive mechanism to realize automatic tool changing to main shaft to the time of greatly reduced manual tool changing and unsafe factor, effectively improved the efficiency of processing.

Description

Technical Field

[0001] This utility model relates to the field of precision carving technology, specifically a precision carving machine that can achieve rapid tool changing. Background Technology

[0002] A CNC engraving machine is a type of CNC machine tool capable of non-contact cutting and drilling of metal, non-metal sheets, and pipes. It is particularly suitable for laser cutting of materials such as aluminum alloys, glass, plastics, and acrylic sheets. During engraving, a CNC engraving machine requires tool changes to accommodate different patterns. Although existing CNC engraving machines are equipped with tool magazines, manual tool changing is still necessary, which wastes time, reduces production efficiency, and poses safety hazards. Utility Model Content

[0003] The purpose of this invention is to provide a precision engraving machine that enables rapid tool changing. By cooperating with the tool magazine and the X-axis drive mechanism and Z-axis drive mechanism, automatic tool changing of the spindle is achieved, thereby greatly reducing the time and safety risks of manual tool changing and effectively improving processing efficiency, thus solving the problem of inconvenient tool changing in existing precision engraving machines mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A precision engraving machine capable of rapid tool changing includes a base and a frame disposed on the top surface of the base. A crossbeam is formed at the top of the frame. A worktable located below the crossbeam is movably disposed on the top surface of the base. An X-axis drive mechanism is movably disposed on the side wall of the crossbeam. A Z-axis drive mechanism is movably disposed on the X-axis drive mechanism. A spindle and a tool mounted on the bottom end of the spindle are disposed on the Z-axis drive mechanism. A tool magazine is disposed at the bottom of the crossbeam. The tool magazine includes an upper fixed plate fixed to the crossbeam, an upper shell connected to the front end of the upper fixed plate, a lower shell hinged to the bottom end of the upper shell, a slide plate movably disposed at the bottom of the upper fixed plate, and a tool holder connected to the front end of the slide plate.

[0006] Preferably, the tool holder includes a base plate and a tool storage plate detachably mounted on the base plate. The tool storage plate has a plurality of tool storage holes arranged in a linear pattern, and the base plate has through holes corresponding to the tool storage holes for the lower end of the tool to pass through.

[0007] Preferably, the tool magazine includes a swing arm, one end of which is hinged to the tool holder and the other end of which is hinged to the lower housing. As the slide plate slides out relative to the upper fixed plate, the tool holder drives the lower housing to swing downward and open.

[0008] Preferably, the upper and lower shell covers have L-shaped cross-sections so that the lower and upper shell covers can be tightly fastened together.

[0009] Preferably, the tool magazine includes a third slide rail, a third screw, a third nut sleeve, and a third servo motor. The two third slide rails are arranged parallel to each other on the bottom surface of the upper fixed plate. The slide plate is movably arranged on the two third slide rails. The third screw is rotatably arranged on the bottom surface of the upper fixed plate. The third nut sleeve connected to the slide plate is threaded onto the third screw.

[0010] Preferably, the tool magazine includes side cover plates connected to both sides of the upper fixed plate and a bottom cover plate connected to the bottom ends of the two side cover plates. The bottom cover plate, the two side cover plates and the upper fixed plate form a cavity to accommodate the third slide rail, the third screw, the third nut sleeve and the third servo motor.

[0011] Preferably, the X-axis drive mechanism includes a first slide rail, a first slide block, a first screw, and a first servo motor. There are two first slide rails, which are arranged in parallel on the side of the crossbeam. The first slide block is movably mounted on the two first slide rails. The first screw is rotatably mounted on the side of the crossbeam. The output shaft of the first servo motor is connected to one end of the first screw. The bottom of the first slide block is connected to a first nut sleeve that is threadedly connected to the first screw.

[0012] Preferably, the Z-axis drive mechanism includes a second slide rail, a second slide block, a second screw, and a second servo motor. There are two second slide rails, which are arranged parallel to the side of the second slide block and perpendicular to the first slide rail. The second slide block is movably mounted on the two second slide rails. The second screw is rotatably mounted on the side of the first slide block and extends vertically. The output shaft of the second servo motor is connected to one end of the second screw. The bottom of the second slide block is connected to a second nut sleeve that is threadedly connected to the second screw. The main shaft is located on the lower side of the second slide block.

[0013] Preferably, outer protective plates are respectively provided on the outer sides of the two second slide rails, a motor fixing plate for mounting the second servo motor is provided on the top of the first slide block, a first bellows cover is provided between the two outer protective plates and the two ends are respectively connected to the motor fixing plate and the second slide block, and a protective cover covering the outer periphery of the main shaft is provided on the side of the second slide block; the two side walls of the protective cover are respectively connected to the second bellows cover.

[0014] Preferably, the base is provided with a Y-axis drive mechanism, which includes a fourth slide rail, a fourth slide block, a fourth screw, and a fourth servo motor. There are two fourth slide rails, which are arranged parallel to each other on the top surface of the base. The fourth slide block is movably mounted on the two fourth slide rails. The fourth screw is rotatably mounted on the top surface of the base. The fourth servo motor is horizontally mounted on the top surface of the base. The output shaft of the fourth servo motor is connected to one end of the fourth screw. The bottom of the fourth slide block is connected to a fourth nut sleeve that is threadedly connected to the fourth screw.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by cooperating with the tool magazine and the X-axis drive mechanism and the Z-axis drive mechanism, automatic tool changing of the spindle is realized, thereby greatly reducing the time and safety factors of manual tool changing and effectively improving the processing efficiency; by cooperating with the Y-axis drive mechanism and the X-axis drive mechanism and the Z-axis drive mechanism, the machining of the workpiece on the worktable by the tool on the spindle is realized, with a high degree of automation. Attached Figure Description

[0016] Figure 1 This is a perspective view of the engraving machine of this utility model that enables rapid tool changing;

[0017] Figure 2 This is a perspective view of the interior of the outer protective cover of this utility model;

[0018] Figure 3 This is a perspective view of the X-axis drive mechanism and the Z-axis drive mechanism of this utility model;

[0019] Figure 4 This is a perspective view of the tool magazine of this utility model;

[0020] Figure 5 This is a cross-sectional view of the tool magazine of this utility model;

[0021] Figure 6 This is an exploded view of the tool magazine of this utility model;

[0022] Figure 7 This is an exploded view of the Y-axis drive mechanism of this utility model.

[0023] In the diagram: 1. Base; 2. Frame; 21. Crossbeam; 3. Worktable; 4. X-axis drive mechanism; 41. First slide rail; 42. First slide block; 43. First screw; 44. First servo motor; 45. Outer protective plate; 46. Motor mounting plate; 47. First bellows cover; 5. Z-axis drive mechanism; 51. Second slide block; 52. Second screw; 53. Second servo motor; 54. Protective cover; 55. Second bellows cover; 6. Spindle; 7. Tool; 8. Tool magazine; 81. Upper fixing plate; 82. Upper shell cover; 83. Lower shell cover; 84. Slide plate; 85. Tool holder; 86. 1. Base plate; 852. Knife storage plate; 86. Swing arm; 87. Third slide rail; 88. Third screw; 89. Third nut sleeve; 810. Third servo motor; 811. Side cover plate; 812. Bottom cover plate; 813. Angle plate; 9. Y-axis drive mechanism; 91. Fourth slide rail; 92. Fourth slide block; 921. Clearance hole; 93. Fourth screw; 94. Fourth servo motor; 95. Fourth nut sleeve; 10. Splash-proof structure; 101. End guard plate; 102. Side guard plate; 1021. Slide groove; 103. Top cover plate; 104. Third bellows cover; 11. Outer cover. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-3 A precision engraving machine capable of rapid tool changing includes a base 1 and a frame 2 disposed on the top surface of the base 1. A crossbeam 21 is formed at the top of the frame 2. A worktable 3 is movably disposed on the top surface of the base 1 below the crossbeam 21. An X-axis drive mechanism 4 is movably disposed on the side wall of the crossbeam 21. A Z-axis drive mechanism 5 is movably disposed on the X-axis drive mechanism 4. A spindle 6 and a tool 7 mounted at the bottom end of the spindle 6 are disposed on the Z-axis drive mechanism 5. A tool magazine 8 is disposed at the bottom of the crossbeam 21. (See also...) Figure 4-6 The tool magazine 8 includes an upper fixed plate 81 fixed to the crossbeam 21, an upper housing 82 connected to the front end of the upper fixed plate 81, a lower housing 83 hinged to the bottom end of the upper housing 82, a sliding plate 84 movably disposed at the bottom of the upper fixed plate 81, and a tool holder 85 connected to the front end of the sliding plate 84. In this embodiment, the number of spindles 6 can be set according to the workpiece processing requirements and is not limited to one.

[0026] Please see Figure 4-6 The tool holder 85 includes a base plate 851 and a tool storage plate 852 detachably mounted on the base plate 851. The tool storage plate 852 has a plurality of linearly arranged tool storage holes, and the base plate 851 has through holes corresponding to the tool storage holes for the lower end of the tool 7 to pass through. In this embodiment, the tool storage plate 852 is bolted to the top surface of the base plate 851, which facilitates the replacement of the tool storage plate 852 and the replacement of tool storage plates 852 of different specifications, thereby making more types of tools 7 available and expanding the processing range; the inner circumferential surface of the tool storage holes is provided with an annular step to restrict the downward movement of the tool 7.

[0027] During tool changing, as the slide plate 84 slides out relative to the upper fixed plate 81, the lower housing 83 swings open, exposing the tool holder 85 at the front end of the slide plate 84 from inside the upper housing 82 and the lower housing 83. When the tool holder 85 moves below the spindle 6, the X-axis drive mechanism 4 drives the spindle 6 on the Z-axis drive mechanism 5 to align with the empty tool storage hole on the tool holder 85. The Z-axis drive mechanism 5 drives the spindle 6 to descend until the tool 7 is placed back into the tool storage hole. Then, the Z-axis drive mechanism 5 drives the spindle 6 to rise, and the X-axis drive mechanism 4 drives the spindle 6 on the Z-axis drive mechanism 5 to align with the required tool 7 on the tool holder 85. The Z-axis drive mechanism 5 drives the spindle 6 to descend, completing the tool 7 replacement. Finally, the Z-axis drive mechanism 5 drives the spindle 6 and the tool 7 to rise, and the tool holder 85 retracts into the upper housing 82 and the lower housing 83 under the action of the slide plate 84. Subsequently, the tool 7 can process the workpiece on the worktable 3 under the action of the spindle 6. By cooperating with the tool magazine 8, the X-axis drive mechanism 4, and the Z-axis drive mechanism 5, automatic tool changing of the spindle 6 is achieved, which greatly reduces the time and safety risks of manual tool changing and effectively improves machining efficiency.

[0028] Please see Figure 3 The X-axis drive mechanism 4 includes a first slide rail 41, a first slide block 42, a first screw 43, and a first servo motor 44. Two first slide rails 41 are arranged parallel to each other on the side of the crossbeam 21. The first slide block 42 is movably mounted on the two first slide rails 41. The first screw 43 is rotatably mounted on the side of the crossbeam 21. The output shaft of the first servo motor 44 is connected to one end of the first screw 43. A first nut sleeve (not shown) is threadedly connected to the bottom of the first slide block 42 and is connected to the first screw 43. When the first servo motor 44 drives the first screw 43 to rotate, the first nut sleeve and the first slide block 42 move axially along the first screw 43.

[0029] Please see Figure 3 The Z-axis drive mechanism 5 includes a second slide rail (not shown), a second slide block 51, a second screw 52, ​​and a second servo motor 53. There are two second slide rails, arranged parallel to the side of the second slide block 51 and perpendicular to the first slide rail 41. The second slide block 51 is movably mounted on the two second slide rails. The second screw 52 is rotatably mounted on the side of the first slide block 42 and extends vertically. The output shaft of the second servo motor 53 is connected to one end of the second screw 52. A second nut sleeve (not shown) is threadedly connected to the second screw 52 at the bottom of the second slide block 51. The main shaft 6 is located on the lower side of the second slide block 51. When the second servo motor 53 drives the second screw 52 to rotate, the second nut sleeve and the second slide block 51 move axially along the second screw 52.

[0030] In this embodiment, outer protective plates 45 are respectively provided on the outer sides of the two second slide rails, and a motor fixing plate 46 for mounting the second servo motor 53 is provided at the top of the first slide block 42. A first bellows cover 47 is provided between the two outer protective plates 45, with its two ends respectively connected to the motor fixing plate 46 and the second slide block 51. The first bellows cover 47, together with the outer protective plates 45, protects the second slide rails and the second screw 52. A protective cover 54 covering the outer periphery of the main shaft 6 is provided on the side of the second slide block 51 for protecting the main shaft 6; second bellows covers 55 are respectively connected to the two side walls of the protective cover 54.

[0031] The tool magazine 8 includes a swing arm 86, one end of which is hinged to the tool holder 85, and the other end is hinged to the lower housing 83. As the sliding plate 84 slides out relative to the upper fixed plate 81, the tool holder 85 drives the lower housing 83 to swing downwards and open. In this embodiment, the upper housing 82 and the lower housing 83 have L-shaped cross-sections so that the lower housing 83 and the upper housing 82 can be tightly fastened together. The lower housing 83 and the upper housing 82 protect the tools 7 on the tool holder 85, preventing machining debris from splashing onto the tool holder 85.

[0032] Please see Figure 4-6 The tool magazine 8 includes a third slide rail 87, a third screw 88, a third nut sleeve 89, and a third servo motor 810. The two third slide rails 87 are arranged parallel to each other on the bottom surface of the upper fixed plate 81. The slide plate 84 is movably arranged on the two third slide rails 87. The third screw 88 is rotatably arranged on the bottom surface of the upper fixed plate 81. The third nut sleeve 89, which is connected to the slide plate 84, is threaded onto the third screw 88.

[0033] The tool magazine 8 includes side cover plates 811 connected to both sides of the upper fixed plate 81 and a bottom cover plate 812 connected to the bottom ends of the two side cover plates 811. The bottom cover plate 812, the two side cover plates 811, and the upper fixed plate 81 form a cavity to accommodate the third slide rail 87, the third screw 88, the third nut sleeve 89, and the third servo motor 810, thereby providing protection. An angle plate 813 fixed to the crossbeam 21 is connected to the top surface of the upper fixed plate 81.

[0034] Please see Figure 2 as well as Figure 7A Y-axis drive mechanism 9 is provided on the base 1. The Y-axis drive mechanism 9 includes a fourth slide rail 91, a fourth slide block 92, a fourth screw 93, and a fourth servo motor 94. There are two fourth slide rails 91, which are arranged parallel to each other on the top surface of the base 1. The fourth slide block 92 is movably arranged on the two fourth slide rails 91. The fourth screw 93 is rotatably arranged on the top surface of the base 1. The fourth servo motor 94 is horizontally arranged on the top surface of the base 1. The output shaft of the fourth servo motor 94 is connected to one end of the fourth screw 93. The bottom of the fourth slide block 92 is connected to a fourth nut sleeve 95 that is threadedly connected to the fourth screw 93.

[0035] In this embodiment, the worktable 3 is connected to the top of the fourth slide 92. A tool setter is provided on the side of the worktable 3 to quickly detect key dimensions such as the tool length and diameter of the tool 7, so as to ensure the accuracy of the tool 7 data before processing.

[0036] Please see Figure 7 To protect the Y-axis drive mechanism 9 and prevent debris from falling into it, a splash-proof structure 10 is provided on the base 1. The splash-proof structure 10 includes end guards 101, side guards 102, an upper cover 103, and third bellows covers 104. Two end guards 101 are arranged opposite each other at the front and rear ends of the fourth slide rail 91. Two side guards 102 are respectively arranged on the outer sides of the two fourth slide rails 91 in the left and right directions. Each side guard 102 is connected to both ends of the two end guards 101. The upper cover 103 is connected to the top ends of the two end guards 101. Two third bellows covers 104 are provided, each connected at one end to the fourth slide block 92 and at the other end to the end guard 101.

[0037] In this embodiment, the two side guard plates 102 are respectively provided with sliding grooves 1021 along their length direction, and the two ends of the third bellows cover 104 are respectively movably disposed in the sliding grooves 1021; the fourth slide 92 is provided with a clearance hole 921 for the upper cover plate 103 to pass through.

[0038] In this embodiment, an outer protective cover 11 is provided on the outer edge of the top surface of the base 1, which surrounds the frame 2, the X-axis drive mechanism 4, and the Z-axis drive mechanism 5.

[0039] The working principle of this precision engraving machine capable of rapid tool changing is as follows: During tool changing, the third servo motor 810 drives the third screw 88 to rotate. Under the action of the third screw 88, the slide plate 84 moves relative to the upper fixed plate 81 downwards from the spindle 6. During this process, the slide plate 84 drives the lower housing 83 to swing open via the swing arm 86, exposing the tool holder 85 at the front end of the slide plate 84 from inside the upper housing 82 and the lower housing 83. Figure 6As shown; when the tool holder 85 moves below the spindle 6, the first servo motor 44 drives the first screw 43 to rotate. Under the action of the first screw 43, the first slide 42, together with the spindle 6 on the second slide 51, moves along the X-axis until it is aligned with the empty tool storage hole of the tool storage plate 852. Then, the second servo motor 53 drives the second screw 52 to rotate. Under the action of the second screw 52, ​​the second slide 51 drives the spindle 6 to descend until the tool 7 is placed back into the tool storage hole. Then, the second slide 51 drives the spindle 6 to rise, and the first slide 42 drives the spindle 6 on the second slide 51 to move along the X-axis, so that the spindle 6 is aligned with the tool storage plate 852. The corresponding cutting tool 7 is moved on the second slide 51, which drives the spindle 6 to descend, thus completing the replacement of the cutting tool 7. Finally, the second slide 51 drives the spindle 6 and the cutting tool 7 to rise, and the tool holder 85 is also retracted into the upper shell 82 and the lower shell 83 under the action of the slide plate 84. Then, the cutting tool 7 can process the workpiece on the worktable 3 under the action of the spindle 6. During this process, the fourth servo motor 94 drives the fourth screw 93 to rotate. Under the action of the fourth screw 93, the fourth slide 92 and the worktable 3 on it move along the Y-axis, so that the cutting tool 7 can process the workpiece in different parts of the worktable 3, or process different parts of the workpiece on the worktable 3.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precision engraving machine capable of rapid tool changing, comprising a base (1) and a frame (2) disposed on the top surface of the base (1), wherein a crossbeam (21) is formed at the top of the frame (2), characterized in that: The base (1) is movably provided with a worktable (3) located below the crossbeam (21) on its top surface. The crossbeam (21) is movably provided with an X-axis drive mechanism (4) on its side wall. The X-axis drive mechanism (4) is movably provided with a Z-axis drive mechanism (5). The Z-axis drive mechanism (5) is provided with a spindle (6) and a tool (7) installed at the bottom of the spindle (6). The bottom of the crossbeam (21) is provided with a tool magazine (8). The tool magazine (8) includes an upper fixed plate (81) fixed on the crossbeam (21), an upper shell cover (82) connected to the front end of the upper fixed plate (81), a lower shell cover (83) hinged to the bottom end of the upper shell cover (82), a sliding plate (84) movably provided at the bottom of the upper fixed plate (81), and a tool holder (85) connected to the front end of the sliding plate (84).

2. The engraving machine capable of rapid tool changing according to claim 1, characterized in that: The tool holder (85) includes a base plate (851) and a tool storage plate (852) detachably mounted on the base plate (851). The tool storage plate (852) has a plurality of tool storage holes arranged in a linear pattern. The base plate (851) has through holes corresponding to the tool storage holes so that the lower end of the tool (7) can pass through.

3. The engraving machine capable of rapid tool change according to claim 1 or 2, characterized in that: The tool magazine (8) includes a swing arm (86), one end of which is hinged to the tool holder (85) and the other end is hinged to the lower cover (83). When the slide plate (84) slides out relative to the upper fixed plate (81), the tool holder (85) drives the lower cover (83) to swing downward and open.

4. The engraving machine capable of rapid tool changing according to claim 3, characterized in that: The upper shell (82) and the lower shell (83) have L-shaped cross sections so that the lower shell (83) and the upper shell (82) can be tightly fastened together.

5. The engraving machine capable of rapid tool changing according to claim 1, characterized in that: The tool magazine (8) includes a third slide rail (87), a third screw (88), a third nut sleeve (89), and a third servo motor (810). The two third slide rails (87) are arranged parallel to each other on the bottom surface of the upper fixed plate (81). The slide plate (84) is movably arranged on the two third slide rails (87). The third screw (88) is rotatably arranged on the bottom surface of the upper fixed plate (81). The third nut sleeve (89) connected to the slide plate (84) is threaded onto the third screw (88).

6. The engraving machine capable of rapid tool changing according to claim 5, characterized in that: The tool magazine (8) includes side cover plates (811) respectively connected to both sides of the upper fixed plate (81) and bottom cover plate (812) connected to the bottom ends of the two side cover plates (811). The bottom cover plate (812), the two side cover plates (811) and the upper fixed plate (81) form a cavity to accommodate the third slide rail (87), the third screw (88), the third nut sleeve (89) and the third servo motor (810).

7. The engraving machine capable of rapid tool changing according to claim 1, characterized in that: The X-axis drive mechanism (4) includes a first slide rail (41), a first slide block (42), a first screw (43), and a first servo motor (44). There are two first slide rails (41), which are arranged parallel to each other on the side of the crossbeam (21). The first slide block (42) is movably arranged on the two first slide rails (41). The first screw (43) is rotatably arranged on the side of the crossbeam (21). The output shaft of the first servo motor (44) is connected to one end of the first screw (43). The bottom of the first slide block (42) is connected to a first nut sleeve that is threadedly connected to the first screw (43).

8. The engraving machine capable of rapid tool changing according to claim 7, characterized in that: The Z-axis drive mechanism (5) includes a second slide rail, a second slide block (51), a second screw (52), and a second servo motor (53). There are two second slide rails, which are arranged parallel to the side of the second slide block (51) and perpendicular to the first slide rail (41). The second slide block (51) is movably arranged on the two second slide rails. The second screw (52) is rotatably arranged on the side of the first slide block (42) and extends in the vertical direction. The output shaft of the second servo motor (53) is connected to one end of the second screw (52). The bottom of the second slide block (51) is connected to a second nut sleeve that is threadedly connected to the second screw (52). The main shaft (6) is arranged on the lower side of the second slide block (51).

9. The engraving machine capable of rapid tool changing according to claim 8, characterized in that: The outer sides of the two second slide rails are respectively provided with outer protective plates (45), the top of the first slide (42) is provided with a motor fixing plate (46) for mounting the second servo motor (53), the two outer protective plates (45) are respectively provided with a first bellows cover (47) connected to the motor fixing plate (46) and the second slide (51) at both ends, and the side of the second slide (51) is provided with a protective cover (54) covering the outer periphery of the main shaft (6); the two side walls of the protective cover (54) are respectively connected with the second bellows cover (55).

10. The engraving machine capable of rapid tool changing according to claim 1, characterized in that: The base (1) is provided with a Y-axis drive mechanism (9), which includes a fourth slide rail (91), a fourth slide block (92), a fourth screw (93), and a fourth servo motor (94). There are two fourth slide rails (91), which are arranged parallel to each other on the top surface of the base (1). The fourth slide block (92) is movably arranged on the two fourth slide rails (91). The fourth screw (93) is rotatably arranged on the top surface of the base (1). The fourth servo motor (94) is horizontally arranged on the top surface of the base (1). The output shaft of the fourth servo motor (94) is connected to one end of the fourth screw (93). The bottom of the fourth slide block (92) is connected to a fourth nut sleeve (95) that is threadedly connected to the fourth screw (93).

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