CN116394047A

CN116394047A - Mechanical arm for numerical control machine tool

Info

Publication number: CN116394047A
Application number: CN202310561475.7A
Authority: CN
Inventors: 肖丽红
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2023-07-07

Abstract

The invention relates to a mechanical arm for a numerical control machine tool, which comprises a base and a grabbing device, wherein a horizontal rotary positioner is arranged in the middle of the top surface of the base, a rotating column coaxial with the upper end surface of the position changing part of the horizontal rotary positioner is arranged on the upper end surface of the position changing part of the horizontal rotary positioner, two opposite sides of the upper section of the column body of the rotating column are both connected with a cross arm arranged along the radial direction of the upper section of the column body in a sliding manner along the axial direction of the upper section of the column body, and the outer end part of the cross arm is provided with the grabbing device capable of grabbing a workpiece; the rotary column body is provided with a fixed sleeve in a rotary sleeve manner, and the fixed sleeve is movably supported on the cross arm. According to the invention, as the transverse arms with the grabbing devices are arranged on the two opposite sides of the rotating column, the mechanical arm can grab and transfer the workpiece to be processed and the processed workpiece at the same time, so that the function of synchronously feeding and discharging is realized, and the working efficiency is improved.

Description

Mechanical arm for numerical control machine tool

Technical Field

The invention relates to the technical field, in particular to a mechanical arm for a numerical control machine tool.

Background

The numerical control machine tool is short for numerical control machine tool, and is an automatic machine tool with a program control system. The control system is able to logically process a program defined by control codes or other symbolic instructions, and to decode it, expressed in coded numbers, and input to the numerical control device via the information carrier. The numerical control device sends out various control signals to control the action of the machine tool through operation processing, and parts are automatically machined according to the shape and the size required by the drawing.

When the existing numerical control machine tool processes parts, in order to reduce labor force, the workpiece to be processed and the processed workpiece can be automatically taken by the mechanical arm and placed at a designated position.

Currently, a mechanical arm for a numerical control machine tool is disclosed in the prior art, for example, a mechanical arm for a numerical control machine tool disclosed in chinese patent publication No. CN108673481a, a mechanical arm for a numerical control machine tool disclosed in chinese patent publication No. CN208914170U, and a mechanical arm for a numerical control machine tool disclosed in chinese patent publication No. CN214213085U, each of the mechanical arms has only one grabbing structure, a worker needs to take down a workpiece machined on the numerical control machine tool first, then place the workpiece to be machined on the numerical control machine tool, and the mechanical arm action is not only repeatedly complicated, but also affects the material changing efficiency.

The existing mechanical arm is generally fixedly mounted on or near a numerical control machine tool through bolts, when the position of the mechanical arm is adjusted, the mechanical arm needs to be disassembled and assembled, time and energy of workers are wasted in the disassembly and assembly process, the working efficiency of the workers is reduced, and due to the fact that manufacturing, measurement and mounting tolerances exist, the mechanical arm can be further caused to exceed required errors after being mounted, the mechanical arm needs to be mounted again, and time and labor are wasted.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a robot arm for a numerical control machine tool.

The invention realizes the above purpose through the following technical scheme:

the mechanical arm for the numerical control machine comprises a base and a grabbing device, wherein a horizontal rotary positioner is arranged in the middle of the top surface of the base, a rotating column coaxial with the horizontal rotary positioner is arranged on the upper end surface of a position changing part of the horizontal rotary positioner, two opposite sides of the upper section of a column body of the rotating column are both connected with a cross arm arranged along the radial direction of the upper section of the column body in a sliding manner along the axial direction of the upper section of the column body, and the outer end part of the cross arm is provided with the grabbing device capable of grabbing a workpiece; the rotary column body is rotatably sleeved with a fixed sleeve, and the fixed sleeve is movably supported on the cross arm;

the base is also provided with a first driving mechanism for driving the fixed sleeve to lift.

Preferably, the upper section of the rotating column is a flat square, two vertical surfaces of the flat square are respectively provided with a vertical first sliding rail pair, the sliding part of the first sliding rail pair is provided with a special-shaped sliding block with the bottom surface in sliding fit with the fixed sleeve, and the special-shaped sliding block is connected with a corresponding cross arm.

Preferably, the upper end of the fixing sleeve is detachably connected with a matching sleeve, the upper end face of the matching sleeve is an inclined plane, and the upper end face of the matching sleeve is in sliding fit with the special-shaped sliding block.

Preferably, the lower end of the matching sleeve is connected with the upper end of the fixed sleeve through a flange, and the matching sleeve is connected with the column shaft of the rotary column through a sliding bearing.

Preferably, the first driving mechanism comprises a mounting frame and a second sliding rail pair, the upper end part of the mounting frame is correspondingly and fixedly connected with the fixing sleeve, two second sliding rail pairs which are parallel to each other are symmetrically arranged on the top surface of the base, the upper end surfaces of sliding parts of the second sliding rail pairs are inclined planes, and the upper end surfaces of the sliding parts of the two second sliding rail pairs are positioned on the same plane and are both supported on the bottom surface of the mounting frame in a sliding manner;

the first driving mechanism further comprises a transmission screw rod which is rotationally connected to the base, the transmission screw rod is arranged in parallel with the second sliding rail pair, a first thread slide block is matched with the transmission screw rod body in a transmission manner, and the first thread slide block is correspondingly and fixedly connected with the sliding parts of the two second sliding rail pairs;

the first driving mechanism further comprises a driving motor for driving the transmission screw to rotate.

Preferably, the first driving mechanism further comprises a third sliding rail pair vertically installed on the base, and the sliding part of the third sliding rail pair is correspondingly and fixedly connected with the mounting frame; and a diagonal bracing for increasing the strength of the third sliding rail pair fixing part is arranged between the third sliding rail pair fixing part and the top surface of the base.

Preferably, the base comprises an X-axis sliding table structure, the X-axis sliding table structure comprises a fixed frame and a sliding table, fourth sliding rail pairs are arranged on two side parts of the top surface of the fixed frame along the length direction of the fixed frame, and the bottom surface of the sliding table is correspondingly and fixedly connected with all sliding parts of the fourth sliding rail pairs;

the middle part of the fixing frame is provided with a transmission screw rod parallel to the fourth sliding rail pair, the transmission screw rod body is matched with a second threaded sliding block in transmission and fixedly connected with the bottom surface of the sliding table correspondingly, and one end part of the transmission screw rod is provided with a driving structure.

Preferably, the driving structure comprises a worm wheel fixedly sleeved on the lever body at the end part of the transmission screw, one side of the worm wheel is meshed with a worm, and one end part of the worm is provided with a rotating handle.

Preferably, the driving structure further comprises a box body positioned outside the worm wheel and the worm, the worm rod body is rotationally connected with the box body, one end of the worm is rotationally extended out of the box body, and the rotating handle is arranged.

Preferably, the base further comprises a Y-axis sliding table structure, and the Y-axis sliding table structure and the X-axis sliding table structure form a cross sliding table structure.

The beneficial effects are that:

1. because the two opposite sides of the rotating column are respectively provided with the cross arm with the grabbing device, the mechanical arm can grab and transfer the workpiece to be processed and the processed workpiece at the same time, the function of synchronously feeding and discharging is realized, and the working efficiency is improved;

2. the acting forces of the two cross arms with the grabbing devices on the rotating column are opposite, so that the stress on the rotating column is uniform, the radial force on the rotating column is reduced, and the service life of the rotating column is prolonged;

3. because the upper end surface of the matching sleeve is provided with an inclined surface, the two cross arms have characteristic height difference, and after the rotating column rotates 180 degrees, the positions of the two cross arms are exchanged, so that the feeding and discharging operation can be completed under the condition that the feeding platform and the workbench of the numerical control machine tool have the height difference;

4. because the base includes the cross slip table structure that comprises X axle slip table structure and Y axle slip table structure, can carry out position compensation to the part of the base top after the installation through the cross slip table structure, solved among the prior art because of the existence of preparation, measurement and installation tolerance, surpass the requirement error after leading to the arm installation, need install again technical problem.

Additional features and advantages of the invention will be set forth in the description which follows, or may be learned by practice of the invention.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the structure of the present invention from another perspective;

FIG. 3 is a front view of the present invention;

FIG. 4 is a sectional view I-I of FIG. 3;

FIG. 5 is a schematic view of an explosive assembly of a rotating column, a first sliding rail pair, a special-shaped sliding block, a fixed sleeve and a picture matching sleeve in the invention;

fig. 6 is a schematic representation of the distribution of the present invention when in use.

The reference numerals are explained as follows:

1. a base; A. an X-axis sliding table structure; B. a Y-axis sliding table structure; 11. a fixing frame; 12. a sliding table; 13. a fourth slide rail pair; 14. a transmission screw; 15. a second thread slide; 16. a driving structure; 161. a worm wheel; 162. a worm; 163. rotating the handle; 164. a case; 2. a horizontal rotary positioner; 3. rotating the column; 31. the first sliding rail pair; 32. a special-shaped sliding block; 4. a cross arm; 5. a gripping device; 6. a fixed sleeve; 61. a matching sleeve; 7. a first driving mechanism; 71. a mounting frame; 72. the second sliding rail pair; 73. the third sliding rail pair; 74. diagonal bracing; 75. a drive screw; 76. a first thread slide; 77. a driving motor; 8. a step-by-step transmission device; 9. and (5) a numerical control machine tool.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use of the inventive product, are merely for convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present invention, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.

1-5, a mechanical arm for a numerical control machine tool comprises a base 1 and a grabbing device 5, wherein a horizontal rotary positioner 2 is arranged in the middle of the top surface of the base 1, a rotating column 3 coaxial with the horizontal rotary positioner 2 is arranged on the upper end surface of a position changing part of the horizontal rotary positioner 2, cross arms 4 arranged along the radial direction of the two opposite sides of the upper section of the rotating column 3 are connected in a sliding manner along the axial direction of the rotating column, and the grabbing device 5 capable of grabbing a workpiece is arranged at the outer end part of the cross arms 4; the gripping device 5 may be a finger cylinder or a manipulator, as required.

Further, as shown in fig. 5, the upper section of the rotating column 3 is a flat square, two vertical surfaces of the flat square are provided with vertical first sliding rail pairs 31, the sliding part of the first sliding rail pairs 31 is provided with special-shaped sliding blocks 32 with bottom surfaces in sliding fit with the fixed sleeves 6, and the special-shaped sliding blocks 32 are connected with corresponding cross arms 4; that is, both side portions of the upper end of the rotating column 3 are provided with vertical planes, and the two planes are parallel to each other, and the planes are provided with the first slide rail pair 31.

The column shaft of the rotary column 3 is rotatably sleeved with a fixed sleeve 6, and the fixed sleeve 6 is movably supported on the cross arm 4; the base 1 is also provided with a first driving mechanism 7 for driving the fixed sleeve 6 to lift.

According to the requirement, the upper end of the fixed sleeve 6 is detachably connected with a matching sleeve 61, and the upper end surface of the matching sleeve 61 is in sliding fit with the special-shaped sliding block 32;

specifically, the lower end of the matching sleeve 61 is connected with the upper end of the fixed sleeve 6 through a flange, and the matching sleeve 61 is connected with the column shaft of the rotating column 3 through a sliding bearing.

Further, when the height difference exists between the plane on which the workpiece to be processed is placed and the processed workpiece and the table top of the workbench of the numerical control machine tool, the top surface of the matching sleeve 61 is an inclined surface, in particular an inclined surface which is inclined up and down; when the surface of the workpiece to be processed and the processed workpiece are in height consistent with the table surface of the workbench of the numerical control machine tool, the top surface of the matching sleeve 61 is a horizontal surface.

During the use, can drive fixed cover 6 through first actuating mechanism 7 and descend, two xarm 4 downwardly moving under the effect of gravity at this moment, the grabbing device 5 on two xarm 4 also downwardly moving this moment for grabbing device 5 can snatch the work piece of appointed position, a grabbing device 5 snatchs the work piece of waiting to process, another snatchs the work piece after processing, then rethread first actuating mechanism 7 drives fixed cover 6 and rises, the work piece that is snatched at this moment rises, then rethread horizontal rotation positioner 2 drives the rotation post 3 and rotates 180 degrees, the position of two xarm 4 exchanges this moment, then according to the action principle of snatching the work piece, put down the work piece, the work piece that waiting to process this moment is located the processing region of digit control machine tool, the work piece that waits to process is located the original position of work piece that waits to process.

The setting can snatch the transfer simultaneously the work piece of treating processing and the work piece after the processing like this, has realized the function that goes on in step with the unloading, has improved work efficiency to the rotor column 3 opposite sides all has xarm 4 and grabbing device 5, has consequently reduced the radial force that rotor column 3 received, has improved rotor column 3 life.

In one implementation, as shown in fig. 2, the first driving mechanism 7 includes a mounting frame 71 and a second sliding rail pair 72, where the upper end of the mounting frame is correspondingly and fixedly connected with the fixing sleeve 6, two second sliding rail pairs 72 parallel to each other are symmetrically arranged on the top surface of the base 1, the upper end surfaces of sliding parts of the second sliding rail pairs 72 are inclined planes, and the upper end surfaces of sliding parts of the two second sliding rail pairs 72 are located on the same plane and are both slidably supported on the bottom surface of the mounting frame 71;

the first driving mechanism 7 further comprises a driving screw 75 rotatably connected to the base 1, the driving screw 75 is arranged in parallel with the second sliding rail pairs 72, a first thread slide block 76 is matched with a rod body of the driving screw 75 in a driving manner, and the first thread slide block 76 is correspondingly and fixedly connected with sliding parts of the two second sliding rail pairs 72;

the first drive mechanism 7 further includes a drive motor 77 for driving the rotation of the drive screw 75.

The drive motor 77 can drive the drive screw 75 to rotate, the drive screw 75 rotates to drive the first threaded sliding block 76 and the second sliding rail pair 72 sliding part to move, the second sliding rail pair 72 sliding part upwards supports the mounting frame 71, the mounting frame 71 ascends, the fixed sleeve 6 is further controlled to ascend, and the fixed sleeve 6 can be controlled to descend in the same way.

In another embodiment, the first driving mechanism 7 may be at least two vertically arranged telescopic devices uniformly arranged along the circumferential direction of the fixed sleeve 6, and the fixed sleeve 6 is driven to lift by the vertical telescopic devices.

In the second embodiment, on the basis of the first embodiment, as shown in fig. 2; in order to ensure the stability of the mounting frame 71 and prevent the fixing sleeve 6 from rotating, the first driving mechanism 7 further comprises a third sliding rail pair 73 vertically arranged on the base 1, and the sliding part of the third sliding rail pair 73 is correspondingly and fixedly connected with the mounting frame 72;

further, in order to increase the strength of the third slide rail pair 73, a diagonal brace 74 is provided between the fixing portion of the third slide rail pair 73 and the top surface of the base 1 to increase the strength of the fixing portion of the third slide rail pair 73.

In the third embodiment, as shown in fig. 1-2, in order to solve the problem that the mechanical arm can exceed the required error after being installed and needs to be installed again due to the existence of some manufacturing, measuring and installing tolerances; the base 1 comprises an X-axis sliding table structure A and a Y-axis sliding table structure B, and the Y-axis sliding table structure B and the X-axis sliding table structure A form a cross sliding table structure;

the position of the cross arm 4 on the horizontal plane after installation can be adjusted through the cross sliding table structure formed by the Y-axis sliding table structure B and the X-axis sliding table structure A, so that the rotating column 3 is positioned on the central point of a connecting line between a workpiece to be processed and the processed workpiece;

specifically, as shown in fig. 6, when the workpiece to be processed and the processed workpiece are transported by the step-type transporting device 8, the step-type transporting device 8 is located at one side of the numerically-controlled machine tool 9, at this time, the mechanical arm is installed between the step-type transporting device 8 and the numerically-controlled machine tool 9, at this time, the mechanical arm may be located at a position approximately in the middle between the step-type transporting device 8 and the numerically-controlled machine tool 9, that is, at this time, a larger error may exist in the position of the mechanical arm relative to the position of the step-type transporting device 8 in the middle between the numerically-controlled machine tools 9, only the error is required to be controlled within the range of the stroke of the cross sliding table structure, and then the error may be compensated by the cross sliding table structure, so that the mechanical arm is located at the middle position between the step-type transporting device 8 and the numerically-controlled machine tool 9; when the dislocation condition exists in the two cross arms 4, the horizontal rotation positioner 2 can be used for carrying out rotation compensation, so that the two grabbing devices 5 can grab corresponding workpieces simultaneously; when the horizontal rotary positioner 2 is specifically used, the horizontal rotary positioner 2 can be set to zero degrees, and then the horizontal rotary positioner 2 can be operated at +/-180 degrees on the basis of the zero degrees during specific work.

Because the X-axis sliding table structure A and the Y-axis sliding table structure B compensate the position of the grabbing device 5 when the mechanical arm is installed, the number of times of use is small, and manual adjustment and supplement can be performed to reduce the manufacturing cost;

specifically, as shown in fig. 1, the X-axis sliding table structure a includes a fixed frame 11 and a sliding table 12, wherein both side portions of the top surface of the fixed frame 11 are respectively provided with a fourth sliding rail pair 13 along the length direction of the fixed frame, and the bottom surface of the sliding table 12 is correspondingly and fixedly connected with sliding portions of all the fourth sliding rail pairs 13;

the middle part of the fixed frame 11 is provided with a transmission screw rod 14 parallel to the fourth sliding rail pair 13, the transmission screw rod 14 is matched with a second thread slide block 15 correspondingly and fixedly connected with the bottom surface of the sliding table 12 in a transmission way, and one end part of the transmission screw rod 14 is provided with a driving structure 16.

Further, in order to fix the position of the horizontal rotary positioner 2 after adjustment, the driving structure 16 includes a worm wheel 161 fixedly sleeved on the lever body at the end of the transmission screw 14, a worm 162 is meshed with one side of the worm wheel 161, and a rotating handle 163 is arranged at one end of the worm 162;

further, the driving structure 16 further includes a housing 164 disposed outside the worm wheel 161 and the worm 162, the shaft of the worm 162 is rotatably connected to the housing 164, and one end of the worm 162 is rotatably extended out of the housing 164 and provided with a rotation handle 163.

The Y-axis sliding table structure B is manufactured by adopting the same structure as the X-axis sliding table structure A according to the requirement.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and their equivalents.

Claims

1. The utility model provides a manipulator for digit control machine tool, includes base (1), grabbing device (5), base (1) top surface middle part is equipped with horizontal rotation machine (2) that shift, horizontal rotation machine (2) that shifts up end is equipped with rather than coaxial pivoted post (3), its characterized in that: two opposite sides of the upper section of the column body of the rotating column (3) are connected with a cross arm (4) arranged along the radial direction of the column body in a sliding manner along the axial direction of the column body, and the outer end part of the cross arm (4) is provided with a grabbing device (5) capable of grabbing a workpiece; the column shaft of the rotating column (3) is rotatably sleeved with a fixed sleeve (6), and the fixed sleeve (6) is movably supported on the cross arm (4);

the base (1) is also provided with a first driving mechanism (7) for driving the fixed sleeve (6) to lift.

2. The mechanical arm for a numerical control machine tool according to claim 1, wherein: the upper section of the rotating column (3) is a flat square, two vertical surfaces of the flat square are respectively provided with a vertical first sliding rail pair (31), the sliding part of the first sliding rail pair (31) is provided with a special-shaped sliding block (32) with the bottom surface being in sliding fit with the fixed sleeve (6), and the special-shaped sliding block (32) is connected with a corresponding cross arm (4).

3. The mechanical arm for a numerical control machine tool according to claim 2, wherein: the upper end of the fixed sleeve (6) is detachably connected with a matching sleeve (61), the upper end face of the matching sleeve (61) is an inclined plane, and the upper end face of the matching sleeve (61) is in sliding fit with the special-shaped sliding block (32).

4. A robot arm for a numerical control machine tool according to claim 3, characterized in that: the lower end of the matching sleeve (61) is connected with the upper end of the fixed sleeve (6) through a flange, and the matching sleeve (61) is connected with the column shaft of the rotating column (3) through a sliding bearing.

5. The mechanical arm for a numerical control machine tool according to claim 1, wherein: the first driving mechanism (7) comprises a mounting frame (71) and a second sliding rail pair (72), the upper end part of the mounting frame is correspondingly and fixedly connected with the fixing sleeve (6), two second sliding rail pairs (72) which are parallel to each other are symmetrically arranged on the top surface of the base (1), the upper end surfaces of sliding parts of the second sliding rail pairs (72) are inclined planes, the upper end surfaces of the sliding parts of the two second sliding rail pairs (72) are positioned on the same plane, and the two sliding rail pairs are both supported on the bottom surface of the mounting frame (71) in a sliding manner;

the first driving mechanism (7) further comprises a transmission screw (75) rotatably connected to the base (1), the transmission screw (75) is arranged in parallel with the second sliding rail pairs (72), a first thread slide block (76) is matched with a rod body of the transmission screw (75) in a transmission manner, and the first thread slide block (76) is correspondingly and fixedly connected with sliding parts of the two second sliding rail pairs (72);

the first driving mechanism (7) further comprises a driving motor (77) for driving the transmission screw (75) to rotate.

6. The mechanical arm for a numerical control machine tool according to claim 5, wherein: the first driving mechanism (7) further comprises a third sliding rail pair (73) vertically arranged on the base (1), and a sliding part of the third sliding rail pair (73) is correspondingly and fixedly connected with the mounting frame (72); and a diagonal brace (74) for increasing the strength of the fixing part of the third sliding rail pair (73) is arranged between the fixing part of the third sliding rail pair (73) and the top surface of the base (1).

7. The mechanical arm for a numerical control machine tool according to claim 1, wherein: the base (1) comprises an X-axis sliding table structure (A), the X-axis sliding table structure (A) comprises a fixing frame (11) and a sliding table (12), fourth sliding rail pairs (13) are arranged on two side parts of the top surface of the fixing frame (11) along the length direction of the fixing frame, and the bottom surface of the sliding table (12) is correspondingly and fixedly connected with sliding parts of all the fourth sliding rail pairs (13);

the middle part of the fixing frame (11) is provided with a transmission screw (14) parallel to the fourth sliding rail pair (13), the transmission screw (14) is matched with a second threaded slider (15) correspondingly fixedly connected with the bottom surface of the sliding table (12) in a transmission manner, and one end part of the transmission screw (14) is provided with a driving structure (16).

8. The mechanical arm for a numerical control machine tool according to claim 7, wherein: the driving structure (16) comprises a worm wheel (161) fixedly sleeved on the lever body at the end part of the transmission screw (14), one side of the worm wheel (161) is meshed with a worm (162), and one end part of the worm (162) is provided with a rotating handle (163).

9. The mechanical arm for a numerical control machine tool according to claim 8, wherein: the driving structure (16) further comprises a box body (164) positioned outside the worm wheel (161) and the worm (162), the rod body of the worm (162) is rotationally connected with the box body (164), one end of the worm (162) rotationally extends out of the box body (164), and the rotating handle (163) is arranged.

10. The mechanical arm for a numerical control machine tool according to any one of claims 7 to 9, characterized in that: the base (1) further comprises a Y-axis sliding table structure (B), and the Y-axis sliding table structure (B) and the X-axis sliding table structure (A) form a cross sliding table structure.