Engraving and milling machine with granite lathe bed

Abstract

The invention discloses an engraving and milling machine with a granite lathe bed, and belongs to the technical field of numerical control machine tools, the engraving and milling machine with the granite lathe bed comprises a mounting bottom frame, a machining workbench is fixedly mounted at the upper end of the mounting bottom frame, and first linear driving mechanisms are symmetrically mounted on the two sides of the mounting bottom frame; a second linear driving mechanism is mounted above the mounting bottom frame, a tool storage mechanism is fixedly mounted on one side of the second linear driving mechanism, a fine carving driving assembly is mounted on one side of the tool storage mechanism, and an automatic tool changing mechanism is fixedly arranged between the tool storage mechanism and the fine carving driving assembly; according to the invention, the cutter quick-mounting mechanism and the automatic cutter changing mechanism are matched for use, so that the automation degree of the device is higher, the device can realize continuous processing, production interruption caused by cutter replacement is reduced, and the production process is smoother.

Description

Technical Field

[0001] The invention belongs to the technical field of numerically controlled machine tools, and in particular relates to a precision engraving machine for a granite bed. Background Art

[0002] Granite bed usually refers to the basic support structure made of granite material, which is widely used in the support and stability of mechanical equipment, instruments and other heavy equipment. At the same time, granite is a natural hard rock with excellent compressive strength and wear resistance. The bed made of it can provide very stable support, reduce machine vibration, and improve the accuracy and reliability of the equipment. Although granite is relatively hard, it can be cut and polished through special processing equipment to produce a bed structure that meets specific requirements. The precision engraving machine is equipped with high-performance cutting tools and a powerful power system, which can efficiently process hard materials. At the same time, the precision engraving machine can cut at the micron level to ensure that the processed bed meets the design requirements and provides high-precision surfaces and geometric shapes.

[0003] During the processing of the granite bed precision engraving machine, different cutting methods may be required (such as roughing, finishing, engraving, etc.). Each cutting method may require tools of different shapes and types. For example, a larger diameter tool is used in roughing to increase the removal rate, while a smaller and sharper tool is required in finishing to obtain a higher surface finish. However, the existing precision engraving machine requires the operator to manually replace and install the engraving tool during use. Manual tool replacement takes a lot of time, especially in the case of frequent tool changes, which may significantly reduce production efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a precision engraving machine for a granite bed.

[0005] The technical solution adopted to solve the above technical problems is: a precision engraving machine for a granite bed, comprising a mounting base, a processing workbench fixedly mounted on the upper end of the mounting base, a first linear drive mechanism symmetrically mounted on both sides of the mounting base, a second linear drive mechanism installed above the mounting base, a tool storage mechanism fixedly mounted on one side of the second linear drive mechanism, a precision engraving drive assembly installed on one side of the tool storage mechanism, an automatic tool changing mechanism fixedly arranged between the tool storage mechanism and the precision engraving drive assembly; the tool storage mechanism comprises a tool storage seat fixedly connected to the second linear drive mechanism, a tool quick-loading mechanism is arranged below the tool storage seat and the precision engraving drive assembly, an engraving assembly is installed in the tool quick-loading mechanism, and a limiting mechanism is arranged on one side of the processing workbench.

[0006] Through the above technical solution, the tool quick-loading mechanism and the automatic tool changing mechanism are used in conjunction, making the device more automated, the device can achieve continuous processing, reducing production interruptions caused by tool replacement, and making the production process smoother.

[0007] Furthermore, the first linear drive mechanism includes a fixed plate fixedly connected to the mounting base, fixed plates are slidably connected on both sides of the mounting base, a first cylinder is fixedly installed on one side of the fixed plate, a telescopic rod is fixedly connected to the output end of the first cylinder, the telescopic rod is fixedly connected to the moving platform, a guide rod is fixedly connected between the fixed plates, and the moving platform and the guide rod are slidably connected.

[0008] Through the above technical solution, when the longitudinal position needs to be adjusted, the first cylinder is started, and the first cylinder drives the movable platform to move along the direction of the guide rod through the telescopic rod, so that the longitudinal position of the engraving component is adjusted.

[0009] Furthermore, the second linear drive mechanism includes a support frame fixedly connected to the movable table, a fixed back plate fixedly connected to the upper end of the support frame, a bearing frame fixedly installed on the fixed back plate, a threaded rod rotatably connected between the bearing frames, a first motor fixedly connected to one end of the fixed back plate, a driving shaft fixedly installed on the output end of the first motor, an end of the driving shaft away from the first motor is fixedly connected to the threaded rod, a connecting block is threadedly connected to the threaded rod, linear rails are symmetrically fixedly installed on the fixed back plate, a slider is slidably connected to the linear rails, the slider is fixedly connected to the moving frame, and a connecting frame is fixedly installed on the side of the moving frame away from the fixed back plate.

[0010] Through the above technical solution, when the lateral position needs to be adjusted, the first motor power supply is started, and the output end of the first motor drives the threaded rod to rotate through the driving shaft. When the threaded rod rotates, the connecting block can drive the mechanism on the moving frame through the slider along the direction of the linear track to adjust the lateral position.

[0011] Furthermore, the precision carving drive assembly includes a precision carving drive shell slidably connected to the connecting frame, the upper end of the precision carving drive shell is fixedly connected to the output end of the second cylinder, the second cylinder is fixedly installed on the connecting frame, and an installation cover is fixedly connected to the bottom of the precision carving drive shell.

[0012] Through the above technical solution, the output end of the second cylinder drives the precision carving drive housing to move, thereby realizing the movement of the axial position of the precision carving drive housing, and at the same time, the motor drive end in the precision carving drive housing can drive the rotation.

[0013] Furthermore, the tool quick-loading mechanism includes a connecting table rotatably connected to the precision carving drive assembly, a plurality of positioning grooves are evenly arranged on the circumference of the lower end of the connecting table, steel balls are respectively installed in the plurality of positioning grooves, a moving cylinder is slidably connected to the outer side of the connecting table, a fixing ring is fixedly installed on the inner wall of the moving cylinder, a second spring is installed between the fixing ring and the connecting table, the second spring is sleeved on the outer wall of the connecting table, and a support seat is fixedly installed on the lower surface of the moving cylinder.

[0014] Through the above technical solution, the movable cylinder drives the fixed ring to slide upward to release the locking of the steel ball by the fixed ring, and the movable cylinder drives the fixed ring to slide downward to lock the steel ball in the engaging groove.

[0015] Furthermore, a steel ring groove is provided at the lower end of the connecting platform, and a steel ring is fixedly sleeved on the steel ring groove.

[0016] Furthermore, the engraving component includes a mounting head slidably connected to the connecting table, one end of the mounting head is fixedly connected to a mounting protrusion, an outer wall of the mounting head is provided with a locking groove, the lower end of the mounting head is fixedly connected to a fine carving knife, and a mounting ring is fixedly installed on the fine carving knife.

[0017] Through the above technical solution, the cooperation between the steel ball and the engaging groove makes the installation and disassembly of the fine carving tool more convenient. At the same time, the design of the fine carving tool makes the installation and disassembly process of the tool quick and efficient, reducing the downtime during processing, thereby improving the overall work efficiency.

[0018] Furthermore, the automatic tool changing mechanism includes a connecting shell fixedly connected to the moving frame, a mounting column slidably connected in the connecting shell, a connecting column fixedly connected to the upper end of the mounting column, a fixed gear ring fixedly connected to the upper end of the connecting column, a base plate rotatably connected to the end of the connecting column away from the mounting column, the upper surface of the base plate is fixedly connected to the output end of the third cylinder, the third cylinder is fixedly installed with the connecting shell, a gear is meshed and transmitted on one side of the fixed gear ring, the gear is fixedly connected to the output end of the second motor, the second motor is fixedly connected to the connecting shell, the lower end of the mounting column is fixedly connected to the tool changing platform, a tool changing arm is fixedly installed on the tool changing platform, the two ends of the tool changing arm are semi-arc-shaped, the upper surfaces of the two ends of the tool changing arm are fixedly connected to the driving platform, a cavity is opened in the driving platform, a fourth cylinder is fixedly connected in the cavity, and the output end of the fourth cylinder is fixedly connected to the top platform.

[0019] Through the above technical solution, the output end of the second motor drives the gear to rotate, and the gear drives the fixed gear ring to rotate by meshing with the fixed gear ring, so that the mounting column at the lower end of the connecting column drives the tool changing arm to rotate. At the same time, the output end of the fourth cylinder drives the top platform to move upward, so that the moving cylinder drives the fixed ring to slide, thereby releasing the lock of the fixed ring on the position of the steel ball. Furthermore, the tool changing arm drives the mounting head to be pulled outward through the mounting ring, and the steel ball is pushed out of the engagement groove by the mounting protrusion.

[0020] Furthermore, the limiting mechanism includes an installation shaft slidably connected to the processing workbench, one side of the installation shaft is fixedly connected to a limiting plate, the other side of the installation shaft is fixedly connected to a fixing rod, a fixing handle is installed on the fixing rod, and a first spring is sleeved on the outer side of the installation shaft.

[0021] Through the above technical solution, the staff will press one side against the limit plate. The limit plate is compressed by the thrust of the granite bed and the first spring pushes the installation axis to slide outward. When the other end of the granite bed can be placed in the processing workbench, let go. At this time, the first spring pushes the limit plate to press the granite bed against the processing workbench to fix its engraving position.

[0022] The beneficial effects of the present invention are as follows: (1) The present invention sets an automatic tool changing mechanism, which can complete tool replacement within a few seconds, significantly reducing the downtime in the production process. At the same time, the automatic tool changing mechanism reduces the manual operation links, reducing the risk of improper tool installation or incorrect cutting parameter setting due to human factors during the tool changing process, and the operator does not need to frequently contact the tool, thereby reducing the risk of injury; (2) The present invention makes the installation and disassembly of the fine carving knife more convenient through the cooperation between the steel ball and the engaging groove. At the same time, the design of the fine carving knife makes the installation and disassembly process of the tool quick and efficient, reducing the downtime during processing, thereby improving the overall work efficiency. At the same time, the tool quick installation mechanism and the automatic tool changing mechanism are designed to be used in combination, so that the device has a higher degree of automation, the device can realize continuous processing, and reduces production interruptions caused by tool replacement, making the production process smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a first-view stereoscopic structural diagram of the present invention;

[0024] Figure 2 It is a second perspective three-dimensional structural diagram of the present invention;

[0025] Figure 3 is a three-dimensional structural diagram of the second linear drive mechanism of the present invention;

[0026] Figure 4 It is a three-dimensional structural diagram of the knife storage mechanism of the present invention;

[0027] Figure 5 It is a three-dimensional structural diagram of the precision carving drive assembly structure of the present invention;

[0028] Figure 6 is a cross-sectional view of the knife quick-loading mechanism of the present invention;

[0029] Figure 7 It is the internal structure diagram of the movable cylinder of the present invention;

[0030] Figure 8 It is a three-dimensional structural diagram of the automatic tool changing mechanism of the present invention;

[0031] Fig. 9 It is a cross-sectional structural diagram of the driving platform of the present invention.

[0032] Figure numerals: 1, mounting base; 11, processing workbench; 2, first linear drive mechanism; 21, fixed plate; 22, moving table; 23, first cylinder; 24, telescopic rod; 25, guide rod; 3, second linear drive mechanism; 30, connecting frame; 31, supporting frame; 32, fixed back plate; 33, bearing frame; 34, threaded rod; 35, first motor; 36, driving shaft; 37, linear rail; 38, connecting block; 39, slider; 310, moving frame; 4, limiting mechanism; 41, mounting shaft; 42, limiting plate; 43, fixed rod; 44, fixed handle; 45, first spring; 5, knife storage mechanism; 51, knife storage seat; 6, fine carving drive assembly; 61, fine carving drive housing; 62 , second cylinder; 63, mounting cover; 7, tool quick-loading mechanism; 71, connecting platform; 72, positioning groove; 73, steel ring groove; 74, steel ball; 75, steel ring; 76, second spring; 77, moving cylinder; 78, fixed ring; 79, support seat; 8, carving component; 81, mounting protrusion; 82, engaging groove; 83, fine carving knife; 84, mounting ring; 85, mounting head; 9, automatic tool changing mechanism; 90, connecting shell; 91, third cylinder; 92, base plate; 93, connecting column; 94, fixed gear ring; 95, mounting column; 96, tool changing platform; 97, tool changing arm; 98, driving platform; 99, top platform; 910, gear; 911, second motor; 912, cavity; 913, fourth cylinder. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] like Figure 1-Figure 2As shown, a precision engraving machine for a granite bed of the present embodiment comprises a mounting base 1, a processing workbench 11 is fixedly mounted on the upper end of the mounting base 1, a first linear drive mechanism 2 is symmetrically mounted on both sides of the mounting base 1, a second linear drive mechanism 3 is mounted above the mounting base 1, a tool storage mechanism 5 is fixedly mounted on one side of the second linear drive mechanism 3, a precision engraving drive assembly 6 is mounted on one side of the tool storage mechanism 5, and an automatic tool changing mechanism 9 is fixedly arranged between the tool storage mechanism 5 and the precision engraving drive assembly 6; the tool storage mechanism 5 comprises a tool storage seat 51 fixedly connected to the second linear drive mechanism 3, a tool quick-loading mechanism 7 is arranged below the tool storage seat 51 and the precision engraving drive assembly 6, an engraving assembly 8 is installed in the tool quick-loading mechanism 7, a limiting mechanism 4 is arranged on one side of the processing workbench 11, and the tool quick-loading mechanism 7 and the automatic tool changing mechanism 9 cooperate The use of the device makes the automation degree higher, the device can realize continuous processing, reduces the production interruption caused by tool replacement, and makes the production process smoother; the limiting mechanism 4 includes a mounting shaft 41 which is slidably connected to the processing workbench 11, one side of the mounting shaft 41 is fixedly connected to the limiting plate 42, and the other side of the mounting shaft 41 is fixedly connected to the fixing rod 43, and a fixing handle 44 is installed on the fixing rod 43. A first spring 45 is sleeved on the outer side of the mounting shaft 41. The staff presses one side against the limiting plate 42, and the limiting plate 42 is compressed by the thrust of the granite bed. The first spring 45 pushes the mounting shaft 41 to slide outward. When the other end of the granite bed can be placed in the processing workbench 11, let go. At this time, the first spring 45 pushes the limiting plate 42 to press the granite bed against the processing workbench 11, so that its engraving position is fixed.

[0035] like Figure 1-Figure 3As shown, the first linear drive mechanism 2 includes a fixed plate 21 fixedly connected to the mounting base 1, and the mounting base 1 is slidably connected with the fixed plates 21 on both sides, and a first cylinder 23 is fixedly installed on one side of the fixed plate 21, and a telescopic rod 24 is fixedly connected to the output end of the first cylinder 23, and the telescopic rod 24 is fixedly connected to the moving platform 22, and a guide rod 25 is fixedly connected between the fixed plates 21, and the moving platform 22 is slidably connected to the guide rod 25. When the longitudinal position needs to be adjusted, the first cylinder 23 is started, and the first cylinder 23 drives the moving platform 22 to move along the direction of the guide rod 25 through the telescopic rod 24, so that the longitudinal position of the engraving component 8 is adjusted; the second linear drive mechanism 3 includes a support frame 31 fixedly connected to the moving platform 22, and a fixed back plate 32 is fixedly connected to the upper end of the support frame 31, and a bearing frame 33 is fixedly installed on the fixed back plate 32. A threaded rod 34 is rotatably connected between 33, a first motor 35 is fixedly connected to one end of the fixed back plate 32, a driving shaft 36 is fixedly installed on the output end of the first motor 35, the driving shaft 36 is fixedly connected to the threaded rod 34 at one end away from the first motor 35, a connecting block 38 is threadedly connected to the threaded rod 34, a linear rail 37 is symmetrically fixedly installed on the fixed back plate 32, a slider 39 is slidably connected to the linear rail 37, the slider 39 is fixedly connected to the moving frame 310, and a connecting frame 30 is fixedly installed on the side of the moving frame 310 away from the fixed back plate 32. When the lateral position needs to be adjusted, the power supply of the first motor 35 is started, and the output end of the first motor 35 drives the threaded rod 34 to rotate through the driving shaft 36. When the threaded rod 34 rotates, the connecting block 38 can drive the mechanism on the moving frame 310 to adjust the lateral position through the slider 39 along the direction of the linear rail 37.

[0036] like Figure 1-Figure 7As shown, the fine carving drive assembly 6 includes a fine carving drive shell 61 that is slidably connected to the connecting frame 30, the upper end of the fine carving drive shell 61 is fixedly connected to the output end of the second cylinder 62, the second cylinder 62 is fixedly installed on the connecting frame 30, and a mounting cover 63 is fixedly connected to the bottom of the fine carving drive shell 61, and the output end of the second cylinder 62 drives the fine carving drive shell 61 to move, so as to realize the movement of the axial position of the fine carving drive shell 61, and at the same time, the motor driving end in the fine carving drive shell 61 can drive 07 to rotate; the tool quick-loading mechanism 7 includes a connecting platform 71 that is rotatably connected to the fine carving drive assembly 6, and a plurality of positioning grooves 72 are evenly arranged on the circumference of the lower end of the connecting platform 71, and steel balls 74 are respectively installed in the plurality of positioning grooves 72, and a moving cylinder 77 is slidably connected to the outer side of the connecting platform 71, and a fixing ring 78 is fixedly installed on the inner wall of the moving cylinder 77, and a second spring 76 is installed between the fixing ring 78 and the connecting platform 71, and the second spring 76 is sleeved on the connecting platform 7 1 outer wall, a support seat 79 is fixedly installed on the lower surface of the moving cylinder 77. The moving cylinder 77 drives the fixing ring 78 to slide upward to release the locking of the steel ball 74 by the fixing ring 78, and the moving cylinder 77 drives the fixing ring 78 to slide downward to lock the steel ball 74 in the engaging groove 82; a steel ring groove 73 is provided at the lower end of the connecting platform 71, and a steel ring 75 is fixedly sleeved on the steel ring groove 73; the engraving component 8 includes a mounting head 85 slidably connected to the connecting platform 71, one end of the mounting head 85 is fixedly connected to a mounting protrusion 81, the outer wall of the mounting head 85 is provided with an engaging groove 82, the lower end of the mounting head 85 is fixedly connected to a fine carving knife 83, and a mounting ring 84 is fixedly installed on the fine carving knife 83. The cooperation between the steel ball 74 and the engaging groove 82 makes the installation and removal of the fine carving knife 83 more convenient. At the same time, the design of the fine carving knife 83 makes the installation and removal process of the tool quick and efficient, reducing the downtime in processing, thereby improving the overall work efficiency.

[0037] like Figure 1-Figure 9As shown, the automatic tool changing mechanism 9 includes a connecting shell 90 fixedly connected to the moving frame 310, a mounting column 95 is slidably connected in the connecting shell 90, a connecting column 93 is fixedly connected to the upper end of the mounting column 95, a fixed gear ring 94 is fixedly connected to the upper end of the connecting column 93, a base plate 92 is rotatably connected to the end of the connecting column 93 away from the mounting column 95, an upper surface of the base plate 92 is fixedly connected to the output end of the third cylinder 91, the third cylinder 91 is fixedly installed with the connecting shell 90, a gear 910 is meshed and transmitted on one side of the fixed gear ring 94, the gear 910 is fixedly connected to the output end of the second motor 911, the second motor 911 is fixedly connected to the connecting shell 90, a tool changing platform 96 is fixedly connected to the lower end of the mounting column 95, a tool changing arm 97 is fixedly installed on the tool changing platform 96, both ends of the tool changing arm 97 are arranged in a semi-arc shape, and the tool changing arm 97 A driving platform 98 is fixedly connected to the upper surface of both ends, a cavity 912 is opened in the driving platform 98, and a fourth cylinder 913 is fixedly connected in the cavity 912. The output end of the fourth cylinder 913 is fixedly connected to the top platform 99, and the output end of the second motor 911 drives the gear 910 to rotate. The gear 910 drives the fixed gear ring 94 to rotate by engaging with the fixed gear ring 94, so that the mounting column 95 at the lower end of the connecting column 93 drives the tool changing arm 97 to rotate. At the same time, the output end of the fourth cylinder 913 drives the top platform 99 to move upward, so that the moving cylinder 77 drives the fixed ring 78 to slide, thereby releasing the locking of the fixed ring 78 on the position of the steel ball 74. Further, the tool changing arm 97 drives the mounting head 85 to be pulled outward through the mounting ring 84, and the steel ball 74 is pushed out of the engaging groove 82 by the mounting protrusion 81.

[0038] The working principle of this embodiment is as follows. When changing the tool, the second motor 911 is started, and the output end of the second motor 911 drives the gear 910 to rotate. The gear 910 drives the fixed gear ring 94 to rotate by meshing with the fixed gear ring 94, so that the mounting column 95 at the lower end of the connecting column 93 drives the tool changing arm 97 to rotate. When the tool changing arm 97 rotates into the mounting ring 84, the fourth cylinder 913 is started, and the output end of the fourth cylinder 913 drives the top platform 99 to move upward. The top platform 99 moves up to abut against the support seat 79, so that the moving cylinder 77 slides upward along the connecting platform 71, and the moving cylinder 77 drives the fixed ring 78 to slide, thereby releasing the locking of the fixed ring 78 on the position of the steel ball 74, and the third cylinder 91 is started. The third cylinder 91 drives the entire tool changing arm 97 to move downward, and the tool changing arm 97 drives the mounting head 85 to be pulled outward through the mounting ring 84. The steel ball 74 is pushed out of the engaging groove 82 by the mounting protrusion 81, so that the mounting head 85 can be removed from the tool quick-installing mechanism 7;

[0039] Continue to rotate the tool changing arm 97. When the tool changing arm 97 drives the two fine carving knives 83 to rotate to the opposite position, start the third cylinder 91. The third cylinder 91 drives the entire tool changing arm 97 to move upward, and aligns the mounting head 85 with the connecting platform 71 and inserts it. At this time, the movable cylinder 77 moves upward under the action of the top platform 99, and the fourth cylinder 913 drives the top platform 99 to move downward and return to its original position. The movable cylinder 77 loses the force of the top platform 99 and drives the fixed ring 78 to slide, so that the fixed ring 78 applies a pressure to the steel ball 74, and the steel ball 74 engages with the engagement groove 82 through the positioning groove 72, thereby completing the fixed installation between the mounting head 85 and the fine carving drive assembly 6.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A fine carving machine for a granite bed, comprising a mounting frame (1), a processing workbench (11) being fixedly mounted on the upper end of the mounting frame (1), a first linear drive mechanism (2) being symmetrically mounted on both sides of the mounting frame (1), a second linear drive mechanism (3) being mounted above the mounting frame (1), a tool storage mechanism (5) being fixedly mounted on one side of the second linear drive mechanism (3), a fine carving drive assembly (6) being mounted on one side of the tool storage mechanism (5), and an automatic tool changing mechanism (9) being fixedly mounted between the tool storage mechanism (5) and the fine carving drive assembly (6); The tool storage mechanism (5) comprises a tool storage seat (51) fixedly connected to the second linear drive mechanism (3); a tool quick-loading mechanism (7) is provided below the tool storage seat (51) and the fine carving drive assembly (6); an engraving assembly (8) is installed in the tool quick-loading mechanism (7); and a limiting mechanism (4) is provided on one side of the processing workbench (11).

2. The granite bed engraving machine according to claim 1, characterized in that: The first linear drive mechanism (2) comprises a fixed plate (21) fixedly connected to the mounting base (1), the mounting base (1) is slidably connected to the fixed plates (21) on both sides, a first cylinder (23) is fixedly mounted on one side of the fixed plate (21), a telescopic rod (24) is fixedly connected to the output end of the first cylinder (23), the telescopic rod (24) is fixedly connected to the moving platform (22), a guide rod (25) is fixedly connected between the fixed plates (21), and the moving platform (22) and the guide rod (25) are slidably connected.

3. The granite bed engraving machine according to claim 2, characterized in that: The second linear drive mechanism (3) comprises a support frame (31) fixedly connected to the moving platform (22); a fixed back plate (32) is fixedly connected to the upper end of the support frame (31); a bearing frame (33) is fixedly mounted on the fixed back plate (32); a threaded rod (34) is rotatably connected between the bearing frames (33); a first motor (35) is fixedly connected to one end of the fixed back plate (32); a driving shaft (36) is fixedly mounted on the output end of the first motor (35); an end of the driving shaft (36) away from the first motor (35) is fixedly connected to the threaded rod (34); a connecting block (38) is threadedly connected to the threaded rod (34); a linear track (37) is symmetrically fixedly mounted on the fixed back plate (32); a slider (39) is slidably connected to the linear track (37); the slider (39) is fixedly connected to the moving frame (310); and a connecting frame (30) is fixedly mounted on the side of the moving frame (310) away from the fixed back plate (32).

4. The granite bed engraving machine according to claim 1, characterized in that: The fine carving drive assembly (6) comprises a fine carving drive housing (61) slidably connected to a connecting frame (30); an upper end of the fine carving drive housing (61) is fixedly connected to an output end of a second cylinder (62); the second cylinder (62) is fixedly mounted to the connecting frame (30); and a mounting cover (63) is fixedly connected to the bottom of the fine carving drive housing (61).

5. The granite bed engraving machine according to claim 1, characterized in that: The tool quick-loading mechanism (7) comprises a connecting platform (71) rotatably connected to the fine carving drive assembly (6); a plurality of positioning grooves (72) are evenly arranged on the circumference of the lower end of the connecting platform (71); steel balls (74) are respectively installed in the plurality of positioning grooves (72); a moving cylinder (77) is slidably connected to the outer side of the connecting platform (71); a fixing ring (78) is fixedly installed on the inner wall of the moving cylinder (77); a second spring (76) is installed between the fixing ring (78) and the connecting platform (71); the second spring (76) is sleeved on the outer wall of the connecting platform (71); and a support seat (79) is fixedly installed on the lower surface of the moving cylinder (77).

6. The granite bed precision engraving machine according to claim 5, characterized in that: A steel ring groove (73) is formed at the lower end of the connecting platform (71), and a steel ring (75) is fixedly sleeved on the steel ring groove (73).

7. The granite bed engraving machine according to claim 1, characterized in that: The engraving assembly (8) comprises a mounting head (85) slidably connected to the connecting platform (71); one end of the mounting head (85) is fixedly connected to a mounting protrusion (81); an outer wall of the mounting head (85) is provided with a snap-fit ​​groove (82); a lower end of the mounting head (85) is fixedly connected to a fine carving knife (83); and a mounting ring (84) is fixedly mounted on the fine carving knife (83).

8. The granite bed engraving machine according to claim 1, characterized in that: The automatic tool changing mechanism (9) comprises a connecting shell (90) fixedly connected to the moving frame (310), a mounting column (95) is slidably connected inside the connecting shell (90), a connecting column (93) is fixedly connected to the upper end of the mounting column (95), a fixed gear ring (94) is fixedly connected to the upper end of the connecting column (93), a base plate (92) is rotatably connected to one end of the connecting column (93) away from the mounting column (95), an upper surface of the base plate (92) is fixedly connected to the output end of the third cylinder (91), the third cylinder (91) is fixedly installed on the connecting shell (90), and a gear (910) is meshed and transmitted on one side of the fixed gear ring (94). The gear (910) is fixedly connected to the output end of the second motor (911), the second motor (911) is fixedly connected to the connecting shell (90), the lower end of the mounting column (95) is fixedly connected to a tool changing platform (96), a tool changing arm (97) is fixedly installed on the tool changing platform (96), the two ends of the tool changing arm (97) are arranged in a semi-arc shape, the upper surfaces of the two ends of the tool changing arm (97) are fixedly connected to a driving platform (98), a cavity (912) is provided in the driving platform (98), a fourth cylinder (913) is fixedly connected in the cavity (912), and the output end of the fourth cylinder (913) is fixedly connected to the top platform (99).

9. The granite bed precision engraving machine according to claim 1, characterized in that: The limiting mechanism (4) comprises a mounting shaft (41) slidably connected to the processing workbench (11); one side of the mounting shaft (41) is fixedly connected to a limiting plate (42); the other side of the mounting shaft (41) is fixedly connected to a fixing rod (43); a fixing handle (44) is mounted on the fixing rod (43); and a first spring (45) is sleeved on the outer side of the mounting shaft (41).

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