Positioning tool for machining

Abstract

Two supporting sliding tables are movably installed in the middle of the upper surface of a workbench, lifting push rods are installed on the two sides of the upper surface of the workbench, auxiliary supporting assemblies are installed at the top telescopic ends of the lifting push rods, and first sliding blocks are fixedly connected to the middles of the lower surfaces of the supporting sliding tables; a first motor is installed on one side of the workbench, one end of a driving shaft of the first motor is fixedly connected with a first double-thread screw, the two first sliding blocks are in threaded sleeve connection with the two sides of the first double-thread screw correspondingly, a clamping box is installed on the upper surface of the supporting sliding table, and a supporting ring cylinder is installed in the middle of the inner side of the clamping box. Supporting gears are rotationally connected to the four corners in the clamping box and located around the supporting ring cylinders, a plurality of pushing blocks used for clamping and positioning the cylindrical parts are installed on the inner sides of the supporting ring cylinders, and the two supporting ring cylinders drive the cylindrical parts to rotate, so that workers can conveniently conduct welding and other machining on the two cylindrical parts; and super-long cylindrical parts and tubular parts can be machined.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a positioning tool for mechanical processing. Background Art

[0002] During the machining process, the initial workpieces are basically of standard sizes. In order to make the workpieces meet actual usage requirements, welding operations are usually required.

[0003] The patent document with the publication number CN114833522A discloses an adjustable clamping and positioning tool for mechanical engineering, which relates to the field of mechanical processing. The adjustable clamping and positioning tool for mechanical engineering has a support mechanism in the middle of the upper surface of the positioning processing table, a support tube at the top of the positioning support frame, an electric hydraulic rod and a sliding tube at the two ends of the support tube, an arc-shaped support plate at the outer surface of the end of the sliding tube, and the output end of the electric hydraulic rod is connected to the sliding tube and the arc-shaped support plate in a transmission manner. The internal rotation of the positioning processing table is connected with a hexagonal drive rod, and the outer surface of the positioning processing table is provided with a drive turntable, which is connected to the support tube in a transmission manner through the hexagonal drive rod. The adjustable clamping and positioning tool for mechanical engineering can simultaneously realize multi-point positioning and fixing of two groups of metal pipe bodies with welding, keep the two groups of metal pipe bodies in the same circular shape, and realize synchronous rotation at the same time, so that the overall fixation is convenient and the welding accuracy is high.

[0004] The above device has the following shortcomings: when in use, the above device cannot process rods and pipes with a long length, and the processing range is narrow; and when in use, the above device cannot process cylindrical parts with a large diameter, and the processing effect is poor. Summary of the invention

[0005] The purpose of the present invention is to provide a positioning tool for mechanical processing in order to address the above-mentioned problems and shortcomings, thereby improving the overall work efficiency.

[0006] The technical problems solved by the present invention are:

[0007] (1) The above device cannot process long rods and pipes when in use, and the processing range is narrow;

[0008] (2) The above device cannot process cylindrical parts with large diameters when used, and the processing effect is poor.

[0009] The purpose of the present invention can be achieved through the following technical solutions: a positioning tool for mechanical processing, comprising a workbench, two supporting slides are movably installed in the middle of the upper surface of the workbench, lifting push rods are installed on both sides of the upper surface of the workbench, and auxiliary support components are installed on the top telescopic ends of the lifting push rods. A first slider is fixedly connected to the middle of the lower surface of the supporting slide, a first motor is installed on one side of the workbench, and a first double-headed screw is fixedly connected to one end of the driving shaft of the first motor. The two first slides are respectively threadedly sleeved on both sides of the first double-headed screw, and a clamp is installed on the upper surface of the supporting slide. A holding box, a supporting ring cylinder is installed in the middle of the inner side of the clamping box, and supporting gears are rotatably connected at the four corners of the clamping box and around the supporting ring cylinder, a plurality of transmission teeth uniformly distributed at equal angles are opened on the outer periphery of the supporting ring cylinder, the supporting ring cylinder is meshed with the supporting gears through the transmission teeth, a plurality of push blocks for clamping and positioning the columnar parts are installed on the inner side of the supporting ring cylinder, a second motor is installed at a top corner of one of the clamping boxes, one end of the driving shaft of the second motor is fixedly connected to a spline shaft, and the spline shaft passes through the support gears at a corner of the top of the two clamping boxes near the second motor.

[0010] As a further scheme of the invention, the inner side wall of the support ring tube is fixedly connected with a plurality of support tubes evenly distributed at equal angles, the support tubes correspond to the push blocks one by one, and the end of the support tube close to the push block is movably sleeved with the push tube, the inner circumference of the push tube is threadedly sleeved with a transmission screw, one end of the transmission screw penetrates the inner side wall of the support ring tube and is rotatably connected to the support ring tube, and the end of the transmission screw located in the support ring tube is fixedly sleeved with a transmission gear disk.

[0011] As a further solution of the invention, a connecting plate is fixedly connected to the push block, a connecting buckle fixedly connected to the connecting plate is installed at one end of the push cylinder, and a plurality of limiting strips evenly distributed at equal angles are fixedly connected to the outer periphery of the push cylinder.

[0012] As a further solution of the invention, a ring groove is provided on one side of the support ring tube close to the lifting push rod, and clamping rings are fixedly connected on both sides of the ring groove of the support ring tube. An adjusting ring is installed on the support ring tube through the clamping ring, and the inner side surface of the adjusting ring is provided with meshing teeth for meshing with the transmission gear disk. The inner and outer two sides of the adjusting ring are fixedly connected with limit rings rotatably connected to the clamping ring.

[0013] As a further solution of the invention, a positioning plate is fixedly connected to the outer surface of the adjusting ring, both ends of the positioning plate are slidingly connected to the side of the supporting ring tube, the middle part of the positioning plate is fixedly connected to a handle rod, both ends of the positioning plate are threaded with positioning bolts, and the positioning bolts are abutted against the supporting ring tube.

[0014] As a further solution of the invention, support slides are respectively installed on both sides of the lower surface of the support slide, and a plurality of support rollers for rolling support are installed on the support slides. The support slide is slidably connected to the workbench through the support slides and the support rollers.

[0015] As a further solution of the invention, the auxiliary support assembly includes a second adjusting box, a first adjusting box is fixedly installed on one side of the lower end of the second adjusting box, a third adjusting box is slidably connected to the upper end of the second adjusting box, a lifting screw is rotatably connected in the second adjusting box, and a second double-headed screw is rotatably connected in both the first adjusting box and the third adjusting box.

[0016] As a further scheme of the invention, a lifting slider is threadedly sleeved on the lifting screw, the lifting slider is slidably connected to the second adjusting box, one end of the lifting slider passes through the side wall of the second adjusting box and is fixedly connected to one end of the third adjusting box, the side wall of the second adjusting box is provided with a sliding groove matching the lifting slider, transmission sliders are threadedly sleeved on both sides of the second double-headed screw, supporting casters are fixedly connected to the opposite side walls of the transmission slider, and the upper end of the lifting screw and one end of the second double-headed screw are fixedly connected to an adjusting wheel for rotation.

[0017] Beneficial effects of the present invention:

[0018] (1) The cylindrical part to be processed is clamped by the push block that converges synchronously toward the center, so that the cylindrical part and the supporting ring tube are quickly and accurately made coaxial, and then the first double-headed screw is driven to rotate by the first motor to converge the clamping boxes on the two supporting slides, so that the cylindrical parts on both sides are gathered toward the center, and the two sections of the cylindrical parts are kept coaxial by the push blocks that converge synchronously, and the first adjustment box is raised and lowered by the lifting push rod, and one side of the cylindrical part is clamped and positioned by the supporting casters by adjusting the spacing between each pair of supporting casters, thereby assisting the clamping box and the push block to support and clamp the cylindrical part to avoid excessive pressure on the supporting ring tube, and then the second motor is started, the spline shaft is rotated, the supporting gear is started, and the supporting ring tube is rotated, so that the two supporting ring tubes drive the cylindrical part to rotate, which is convenient for the staff to perform welding and other processing on the two sections of the cylindrical parts, and can process extra-long cylindrical parts and tubular parts;

[0019] (2) When a cylindrical part is installed from one side of the clamping box to the inside of the clamping box, the handle rod is used to push the adjusting ring to rotate each transmission gear disc, which in turn rotates the transmission screw, which pushes the push cylinder, and limits the position through the limiting strip, so that the push cylinder 25 synchronously pushes each push block to gather inward and abut against the outer peripheral surface of the cylindrical part, clamps and fixes the cylindrical part, and keeps the cylindrical part coaxial with the supporting ring cylinder, and keeps the two sections of the cylindrical part coaxial. Before processing, different push blocks can be replaced by connecting plates and connecting buckles according to the material and processing requirements of the cylindrical part, to ensure that the clamping is stable and does not cause damage to the cylindrical part, and the push cylinder can be retracted and moved to adapt to cylindrical parts of different diameters, and the adaptability range is relatively large. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 It is the front view of the overall structure of the present invention;

[0022] Figure 2 A side view of the internal structure of the clamping box of the present invention;

[0023] Figure 3 It is a side view of the internal structure of the support ring cylinder of the present invention;

[0024] Figure 4 It is a side view of the internal structure of the support tube of the present invention;

[0025] Figure 5 A side view of the internal structure of the first adjustment box of the present invention;

[0026] In the figure: 1, workbench; 2, supporting slide; 3, clamping box; 4, lifting push rod; 5, first motor; 6, first slider; 7, first double-headed screw; 8, first adjusting box; 9, second adjusting box; 10, third adjusting box; 11, second motor; 12, spline shaft; 13, supporting slide; 14, supporting roller; 15, supporting ring cylinder; 16, supporting gear; 17, transmission tooth pattern; 18, adjusting ring; 19, positioning plate; 20, handle bar; 21, positioning bolt; 22, limiting ring; 23, clamping ring; 24, supporting cylinder; 25, pushing cylinder; 26, pushing block; 27, transmission screw; 28, transmission gear disc; 29, connecting plate; 30, connecting buckle; 31, limiting strip; 32, lifting screw; 33, lifting slider; 34, adjusting wheel; 35, second double-headed screw; 36, transmission slider; 37, supporting caster. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0028] See also Figure 1-5 As shown: a positioning tool for mechanical processing, including a workbench 1, two supporting slides 2 are movably installed in the middle of the upper surface of the workbench 1, lifting push rods 4 are installed on both sides of the upper surface of the workbench 1, and auxiliary support components are installed on the top telescopic ends of the lifting push rods 4. A first slider 6 is fixedly connected to the middle of the lower surface of the supporting slide 2, a first motor 5 is installed on one side of the workbench 1, and a first double-headed screw 7 is fixedly connected to one end of the driving shaft of the first motor 5. The two first sliders 6 are respectively threadedly sleeved on both sides of the first double-headed screw 7, and a clamping box 3 is installed on the upper surface of the supporting slide 2. The clamping box 3 is installed in the middle of the inner side. There is a support ring cylinder 15, and support gears 16 are rotatably connected at the four corners of the clamping box 3 and around the support ring cylinder 15. The outer periphery of the support ring cylinder 15 is provided with a plurality of transmission teeth 17 evenly distributed at equal angles. The support ring cylinder 15 is meshed with the support gear 16 through the transmission teeth 17. A plurality of push blocks 26 for clamping and positioning the columnar parts are installed on the inner side of the support ring cylinder 15. A second motor 11 is installed at a corner of the top of one of the clamping boxes 3, and a spline shaft 12 is fixedly connected to one end of the driving shaft of the second motor 11. The spline shaft 12 passes through the support gear 16 at a corner of the top of the two clamping boxes 3 near the second motor 11.

[0029] In this embodiment, the two cylindrical parts to be processed are clamped and fixed by the clamping boxes 3 on both sides respectively, and the cylindrical parts to be processed are clamped by the push blocks 26 that converge synchronously toward the center, so that the cylindrical parts and the support ring tube 15 are quickly and accurately made coaxial, and then the first double-headed screw 7 is driven to rotate by the first motor 5 to gather the clamping boxes 3 on the two support slides 2, so that the cylindrical parts on both sides are gathered toward the center, and the two sections of the cylindrical parts are kept coaxial by the push blocks 26 that converge synchronously, and the auxiliary support assembly is raised and lowered by the lifting push rod 4. One side of the columnar part is clamped and positioned through the auxiliary support assembly, so that the auxiliary clamping box 3 and the push block 26 jointly support and clamp the columnar part to avoid excessive pressure on the support ring tube 15 and improve the stability of the columnar part to be processed. Subsequently, the second motor 11 is started, the spline shaft 12 is rotated, the support gear 16 is rotated, and the support ring tube 15 is rotated, so that the two support ring tubes 15 drive the columnar part to rotate, which is convenient for the staff to weld the two sections of the columnar parts and can process extra-long columnar parts and tubular parts.

[0030] The inner side wall of the support ring tube 15 is fixedly connected with a plurality of support tubes 24 evenly distributed at equal angles, and the support tubes 24 correspond to the push blocks 26 one by one, and one end of the support tube 24 close to the push block 26 is movably sleeved with the push tube 25, and the inner circumference of the push tube 25 is threadedly sleeved with a transmission screw 27, one end of the transmission screw 27 penetrates the inner side wall of the support ring tube 15 and is rotatably connected with the support ring tube 15, and one end of the transmission screw 27 located in the support ring tube 15 is fixedly sleeved with a transmission gear disc 28;

[0031] The push block 26 is fixedly connected with a connecting plate 29, one end of the push cylinder 25 is provided with a connecting buckle 30 fixedly connected with the connecting plate 29, the outer periphery of the push cylinder 25 is fixedly connected with a plurality of limit strips 31 evenly distributed at equal angles, and the inner periphery of the port of the support cylinder 24 is provided with a plurality of slots for sliding connection with the limit strips 31;

[0032] The support ring tube 15 is provided with a ring groove on one side close to the lifting push rod 4, and a clamping ring 23 is fixedly connected to both sides of the ring groove of the support ring tube 15. The support ring tube 15 is installed with an adjusting ring 18 through the clamping ring 23. The inner side surface of the adjusting ring 18 is provided with meshing teeth for meshing with the transmission gear plate 28. The inner and outer sides of the adjusting ring 18 are fixedly connected with a limit ring 22 rotatably connected with the clamping ring 23. A positioning plate 19 is fixedly connected to the outer side surface of the adjusting ring 18. Both ends of the positioning plate 19 are slidably connected to the side of the support ring tube 15. A handle bar 20 is fixedly connected to the middle part of the positioning plate 19. Both ends of the positioning plate 19 are threaded with positioning bolts 21, and the positioning bolts 21 abut against the support ring tube 15.

[0033] Support slides 13 are respectively installed on both sides of the lower surface of the support slide 2, and a plurality of support rollers 14 for rolling support are installed on the support slide 13. The support slide 2 is slidably connected to the workbench 1 through the support slide 13 and the support rollers 14;

[0034] In this embodiment, when a cylindrical part is installed from one side of the clamping box 3 to the inside of the clamping box 3, the handle rod 20 pushes the adjusting ring 18 to rotate each transmission gear disc 28, and the transmission screw 27 is rotated by the transmission gear disc 28, and the push cylinder 25 is pushed by the transmission screw 27, and is limited by the limiting strip 31, so that the push cylinder 25 synchronously pushes each push block 26 to gather inward and abut against the outer peripheral surface of the cylindrical part, clamps and fixes the cylindrical part, and makes the cylindrical part remain coaxial with the support ring tube 15, and makes the two sections of the cylindrical part remain coaxial. Before processing, different push blocks 26 can be replaced by connecting plates 29 and connecting buckles 30 according to the material and processing requirements of the cylindrical part, to ensure that the clamping is firm and no damage is caused to the cylindrical part, and the push cylinder 25 can be telescopically movable to adapt to cylindrical parts of different diameters, and the adaptability range is large.

[0035] The auxiliary support assembly includes a second adjusting box 9, a first adjusting box 8 is fixedly installed on one side of the lower end of the second adjusting box 9, a third adjusting box 10 is slidably connected to the upper end of the second adjusting box 9, a lifting screw 32 is rotatably connected in the second adjusting box 9, a second double-headed screw 35 is rotatably connected in both the first adjusting box 8 and the third adjusting box 10, a lifting slider 33 is threadedly sleeved on the lifting screw 32, the lifting slider 33 is slidably connected to the second adjusting box 9, one end of the lifting slider 33 passes through the side wall of the second adjusting box 9 and is fixedly connected to one end of the third adjusting box 10 The side wall of the second adjustment box 9 is provided with a slide groove for matching the lifting slider 33, and the two sides of the second double-headed screw 35 are threadedly sleeved with transmission sliders 36, and each transmission slider 36 is slidably connected with the first adjustment box 8 and the third adjustment box 10 respectively, and the opposite side walls of the first adjustment box 8 and the third adjustment box 10 are provided with a through groove for matching the sliding of the transmission slider 36, and the opposite side walls of the transmission slider 36 are fixedly connected with a supporting caster 37, and the upper end of the lifting screw 32 and one end of the second double-headed screw 35 are fixedly connected with an adjusting wheel 34 for rotation;

[0036] In this embodiment, the lifting screw 32 and the two second double-headed screws 35 are rotated one by one by adjusting the rotating wheel 34, and the transmission slider 36 is synchronously pushed by the second double-headed screw 35 to gather or separate each pair of supporting casters 37, and the third adjustment box 10 is pushed up and down by the lifting screw 32, and the first adjustment box 8 is lifted and down by the lifting push rod 4, so that each supporting caster 37 clamps and supports the cylindrical part to be processed, and the auxiliary support assembly can adapt to cylindrical parts of different diameters.

[0037] When the present invention is in use, the staff clamps the column to be processed by the push block 26 that gathers synchronously toward the center, so as to quickly and accurately make the column coaxial with the support ring tube 15, and then drives the first double-headed screw 7 to rotate by the first motor 5 to gather the clamping boxes 3 on the two support slides 2, so as to gather the column on both sides toward the center, and the push block 26 that gathers synchronously makes the two sections of the column keep coaxial, and the first adjustment box 8 is raised and lowered by the lifting push rod 4, and each pair of supporting casters 37 is adjusted. The support caster 37 is used to clamp and position one side of the columnar member, thereby assisting the clamping box 3 and the push block 26 to support and clamp the columnar member, thereby preventing the support ring tube 15 from being subjected to excessive pressure, and then starting the second motor 11, rotating the spline shaft 12, starting the support gear 16, and rotating the support ring tube 15, so that the two support ring tubes 15 drive the columnar member to rotate, which is convenient for the staff to weld the two sections of the columnar member, and can process the extra-long columnar member and tubular member;

[0038] When a columnar part is installed from one side of the clamping box 3 to the inside of the clamping box 3, the handle rod 20 pushes the adjusting ring 18 to rotate each transmission toothed disc 28, and the transmission screw 27 is rotated by the transmission toothed disc 28, and the push cylinder 25 is pushed by the transmission screw 27, and the limit strip 31 is used to limit the position, so that the push cylinder 25 synchronously pushes each push block 26 to gather in the middle and abut against the outer peripheral surface of the columnar part, clamps and fixes the columnar part, and keeps the columnar part coaxial with the support ring tube 15, and keeps the two sections of the columnar part coaxial. Before processing, according to the material and processing requirements of the columnar part, the connecting plate 29 can be used. Different push blocks 26 are replaced with connecting buckles 30 to ensure firm clamping without causing damage to the columnar parts. The push cylinder 25 is retractably movable, and the lifting screw 32 and the two second double-headed screws 35 are rotated one by one through the adjusting wheel 34. The transmission slider 36 is synchronously pushed by the second double-headed screw 35 to gather or separate each pair of supporting casters 37. The third adjustment box 10 is lifted and lowered by the lifting screw 32, and the first adjustment box 8 is lifted and lowered by the lifting push rod 4, so that each supporting caster 37 clamps and supports the columnar parts to be processed, thereby adapting to columnar parts of different diameters, and the adaptability range is relatively large.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A positioning tool for mechanical processing, characterized in that: The invention comprises a workbench (1), wherein two supporting slides (2) are movably mounted in the middle of the upper surface of the workbench (1), lifting push rods (4) are mounted on both sides of the upper surface of the workbench (1), and auxiliary supporting components are mounted on the top telescopic ends of the lifting push rods (4), and a first sliding block (6) is fixedly connected to the middle of the lower surface of the supporting slide (2), a first motor (5) is mounted on one side of the workbench (1), and a first double-headed screw (7) is fixedly connected to one end of the driving shaft of the first motor (5), and the two first sliding blocks (6) are respectively threadedly sleeved with the two sides of the first double-headed screw (7), and a clamping box (3) is mounted on the upper surface of the supporting slide (2), and a supporting block (6) is mounted in the middle of the inner side of the clamping box (3). The support ring cylinder (15) is provided with a plurality of transmission teeth (17) evenly distributed at equal angles on the outer circumference of the support ring cylinder (15). The support ring cylinder (15) is meshed with the support gear (16) through the transmission teeth (17). The inner side of the support ring cylinder (15) is provided with a plurality of push blocks (26) for clamping and positioning the columnar member. A second motor (11) is installed at a corner of the top of one of the clamping boxes (3). One end of the drive shaft of the second motor (11) is fixedly connected with a spline shaft (12). The spline shaft (12) passes through the support gears (16) at the top of the two clamping boxes (3).

2. A positioning tool for machining according to claim 1, characterized in that: The inner side wall of the support ring tube (15) is fixedly connected with a plurality of support tubes (24) evenly distributed at equal angles, the support tubes (24) correspond to the push blocks (26) one by one, and one end of the support tube (24) close to the push block (26) is movably sleeved with the push tube (25), the inner circumference of the push tube (25) is threadedly sleeved with a transmission screw (27), one end of the transmission screw (27) penetrates the inner side wall of the support ring tube (15) and is rotatably connected to the support ring tube (15), and one end of the transmission screw (27) located in the support ring tube (15) is fixedly sleeved with a transmission gear disk (28).

3. A positioning tool for machining according to claim 2, characterized in that: A connecting plate (29) is fixedly connected to the pushing block (26), a connecting buckle (30) fixedly connected to the connecting plate (29) is installed at one end of the pushing cylinder (25), and a plurality of limiting inserts (31) evenly distributed at equal angles are fixedly connected to the outer periphery of the pushing cylinder (25).

4. A positioning tool for machining according to claim 1, characterized in that: A ring groove is formed on a side of the support ring tube (15) close to the lifting push rod (4), and clamping rings (23) are fixedly connected to both sides of the ring groove of the support ring tube (15). An adjusting ring (18) is installed on the support ring tube (15) through the clamping ring (23), and meshing teeth for meshing with a transmission gear disk (28) are formed on the inner side surface of the adjusting ring (18), and limiting rings (22) rotatably connected to the clamping ring (23) are fixedly connected to the inner and outer sides of the adjusting ring (18).

5. A positioning tool for machining according to claim 1, characterized in that: A positioning plate (19) is fixedly connected to the outer surface of the adjusting ring (18), both ends of the positioning plate (19) are slidably connected to the side surfaces of the supporting ring tube (15), a handle bar (20) is fixedly connected to the middle of the positioning plate (19), and both ends of the positioning plate (19) are threadedly penetrated with positioning bolts (21), which abut against the supporting ring tube (15).

6. A positioning tool for machining according to claim 1, characterized in that: Support slides (13) are respectively installed on both sides of the lower surface of the support slide (2), and a plurality of support rollers (14) for rolling support are installed on the support slide (13). The support slide (2) is slidably connected to the workbench (1) via the support slide (13) and the support rollers (14).

7. A positioning tool for machining according to claim 1, characterized in that: The auxiliary support assembly comprises a second adjustment box (9), a first adjustment box (8) is fixedly mounted on one side of the lower end of the second adjustment box (9), a third adjustment box (10) is slidably connected to the upper end of the second adjustment box (9), a lifting screw (32) is rotatably connected inside the second adjustment box (9), and a second double-headed screw (35) is rotatably connected inside both the first adjustment box (8) and the third adjustment box (10).

8. A positioning tool for machining according to claim 7, characterized in that: A lifting slider (33) is threadedly sleeved on the lifting screw (32), and the lifting slider (33) is slidably connected to the second adjustment box (9). One end of the lifting slider (33) passes through the side wall of the second adjustment box (9) and is fixedly connected to one end of the third adjustment box (10). The side wall of the second adjustment box (9) is provided with a slide groove matched with the lifting slider (33). Both sides of the second double-headed screw (35) are threadedly sleeved with transmission sliders (36), and the opposite side walls of the transmission slider (36) are fixedly connected with supporting casters (37). The upper end of the lifting screw (32) and one end of the second double-headed screw (35) are fixedly connected with an adjusting wheel (34) for rotation.

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