CN111203729A

CN111203729A - Precision machining jig

Info

Publication number: CN111203729A
Application number: CN202010040076.2A
Authority: CN
Inventors: 汪进; 卢志珍; 喻步贤; 朱立义
Original assignee: Huaian Vocational College of Information Technology
Current assignee: Huaian Vocational College of Information Technology
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2020-05-29

Abstract

The invention discloses a precision machining jig which comprises a first box body, wherein two first translation mechanisms are arranged in an inner cavity of the first box body, a first transmission mechanism is arranged between the two first translation mechanisms, a moving box is arranged at the top of the first translation mechanism, transverse moving mechanisms are arranged on the front side and the rear side of the top of the moving box, and a locking mechanism is arranged on one side of each transverse moving mechanism. The precision machining jig solves the problems that when the jig is used, a machined workpiece needs to be fixed and positioned and guided, the machined workpiece is fixed on the jig through bolts, the fixing efficiency is low, the disassembly is complex, when the positioning and guiding operation is performed on the machined workpiece, the positioning and guiding structure is complex, the positioning and guiding efficiency of the machined workpiece is low, and further the production efficiency of the machined workpiece is low.

Description

Precision machining jig

Technical Field

The invention relates to the technical field of jigs, in particular to a precision machining jig.

Background

The jig is a large-scale tool of carpenter, ironworker, pincers worker, machinery, electric control and some other handicrafts, mainly used as a tool for assisting the control position or action (or both), and can be divided into three types, namely a process assembly type jig, an item test type jig and a circuit board test type jig, and the jig can be classified into three types, namely a process assembly type jig, an item test type jig and a circuit board test type jig, wherein the process assembly type jig comprises an assembly jig, a welding jig, a disassembly jig, a glue dispensing jig, an irradiation jig, an adjustment jig and a shearing jig, and the item test type jig comprises a service life test type jig, a packaging test type jig, an environment test type jig, an optical test type jig, a shielding test type jig, a sound insulation test type jig and the like; circuit board testing fixtures, including ICT testing fixtures, FCT functional fixtures, SMT furnace-through fixtures, BGA testing fixtures, etc., have been widely used in industrial times, including mechanical fixtures, woodworking fixtures, welding fixtures, jewelry fixtures, and other fields, some types of fixtures are also called "molds" or "accessories" and are mainly intended to repeat a certain portion of the reproduction in a repetitive and accurate manner, and an obvious example is that when a key is copied, an original key is usually fixed to the fixture, so that the machine can copy a new key by guiding the appearance of the original key.

Many tools are created for commercial purposes because many types of tools are customized, some for increased productivity, repetition of specific actions, or to make work more accurate because the design of the tool is essentially logical and similar tools may be created separately for use at different times and locations.

The jig needs to fix and position the guide to the processing work piece when using, and the processing work piece is all through the bolt fastening on the jig, and fixed inefficiency and dismantlement are loaded down with trivial details, when carrying out the location guide operation to the processing work piece, and the structure of location guide is more complicated for processing work piece location guide inefficiency, and then make the production efficiency of processing work piece low.

Disclosure of Invention

The invention aims to provide a precision machining jig which has the advantages of convenience in disassembly and assembly of workpieces and convenience in positioning and guiding, and solves the problems that when the jig is used, the machined workpieces need to be fixed and positioned and guided, are fixed on the jig through bolts, are low in fixing efficiency and complex in disassembly, and when the machined workpieces are positioned and guided, the positioning and guiding structure is complex, the positioning and guiding efficiency of the machined workpieces is low, and further the production efficiency of the machined workpieces is low.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a precision finishing tool, includes box one, the inner chamber of box one is provided with two translation mechanism one, is provided with drive mechanism one between two translation mechanism one, the top of translation mechanism one is provided with the removal case, the front side and the rear side at removal roof portion all are provided with lateral shifting mechanism, one side of lateral shifting mechanism is provided with the lock solid mechanism, the top of lateral shifting mechanism is provided with box two, the both sides at box two tops all are provided with splint, the bottom of splint is provided with guiding mechanism, guiding mechanism's bottom is provided with drive mechanism two.

Preferably, translation mechanism one is including two slide bars one that are fixed in an inner chamber of box, the surface cover of slide bar one is equipped with sliding sleeve one, the inner wall and a slide bar sliding connection of sliding sleeve one, the top fixedly connected with connecting block one of sliding sleeve one, the top of connecting block one run through to box one the top and with removal case fixed connection, the spread groove one with a connecting block looks adaptation is all seted up to the both sides at box one top.

Preferably, drive mechanism one includes the lead screw of connecting in box inner chamber front side through the bearing commentaries on classics, the lead screw is located between two slide bars one, the surperficial threaded connection of lead screw has the silk cover, the equal fixedly connected with connecting rod in both sides of silk cover, the one end and the sliding sleeve fixed connection of silk cover are kept away from to the connecting rod, the rear end of lead screw runs through to box rear side and the fixedly connected with handle of one.

Preferably, the transverse moving mechanism comprises two rectangular grooves arranged on the front side and the rear side of the top of the moving box, a second sliding rod is fixedly connected to an inner cavity of each rectangular groove, a second sliding sleeve is sleeved on the surface of the second sliding rod, the inner wall of the second sliding sleeve is connected with the second sliding rod in a sliding mode, and the top of the second sliding sleeve extends to the top of the moving box and is fixedly connected with the second box body.

Preferably, the locking mechanism comprises two rectangular through holes arranged on the front side and the rear side of the movable box, the inner cavity of each rectangular through hole is connected with a fastening screw rod in a sliding manner, one end of each fastening screw rod is fixedly connected with the corresponding sliding sleeve, a fastening solenoid is connected to the surface of each fastening screw rod in a threaded manner, and one side of each fastening solenoid is in contact with the movable box.

Preferably, guiding mechanism is including the slide bar three that is fixed in the two inner chambers of box, the equal sliding connection in both sides on the three surfaces of slide bar has sliding sleeve three, the top fixedly connected with connecting block two of sliding sleeve three, the top of connecting block two run through to the top of box two and with splint fixed connection, the connecting groove two with the adaptation of connecting block two phase is seted up at the top of box two.

Preferably, the transmission mechanism II comprises a first rotating shaft rod fixed at the bottom of the sliding sleeve, the surface of the first rotating shaft rod is connected with a pull rod in a rotating mode, the bottom of an inner cavity of the box body II is connected with a rotating rod in a rotating mode through a bearing, a gear is fixedly connected to the top of the rotating rod, a second rotating shaft rod is fixedly connected to the front side and the rear side of the top of the gear, and the surface of the second rotating shaft rod is connected with the pull rod in a rotating mode.

Preferably, the right side fixedly connected with electric telescopic handle of two inner chamber bottoms of box, electric telescopic handle's output fixedly connected with pinion rack, pinion rack and gear engagement, the rear side of pinion rack is provided with stop gear.

Preferably, the limiting mechanism comprises a limiting sliding groove arranged at the rear side of the inner cavity of the box body, the inner cavity of the limiting sliding groove is connected with a limiting sliding block in a sliding mode, and the front side of the limiting sliding block is fixedly connected with the toothed plate.

Preferably, the front side and the rear side of one side of the box body are welded with installation base blocks.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention can fix and remove the processing workpiece by driving the two clamping plates to move oppositely through the transmission mechanism II and the guide mechanism, thereby avoiding the complexity of bolt disassembly and assembly and achieving the purpose of convenient disassembly and assembly, the fixed processing workpiece can move in a front-and-back translational way through the transmission mechanism I and the translation mechanism I, the fixed processing workpiece can move in a left-and-right translational way and be locked through the transverse moving mechanism and the locking mechanism, thereby achieving the purpose of convenient positioning and guiding, solving the problems that the jig needs to fix and position and guide the processing workpiece when in use, the processing workpiece is fixed on the jig through the bolt, the fixing efficiency is low, the disassembly is complex, when the positioning and guiding operation is carried out on the processing workpiece, the structure of the positioning and guiding is complex, the positioning and guiding efficiency of the processing workpiece is low, and the production efficiency of the processing workpiece is low, this precision finishing tool can make the processing work piece dismouting convenient and location guide convenient, has improved the production efficiency of processing the work piece.

2. The screw rod is driven to move back and forth on the surface of the screw rod by the screw sleeve due to the threaded connection relationship between the screw sleeve and the screw rod, the screw sleeve drives the two sliding sleeves I to move back and forth on the surface of the sliding rod I through the connecting rod, so that the sliding sleeves drive the connecting block I to slide in the inner cavity of the connecting groove I, and further the connecting block I drives the moving box to move back and forth, and the purpose of back and forth translation movement can be achieved.

3. According to the invention, through the matched use of the transverse moving mechanism and the locking mechanism, a user can push the second box body left and right, the second box body drives the second sliding sleeve to slide on the surface of the second sliding rod, the second sliding sleeve drives the fastening screw rod to slide in the inner cavity of the rectangular through hole, after moving to a proper position left and right, the user rotates the fastening screw pipe, and as the fastening screw pipe and the fastening screw rod are in a threaded connection relationship, the fastening screw pipe is driven to approach the moving box and contact with the moving box, so that the second sliding sleeve can be locked through friction force, and the purpose of driving the second box body to move left and right and locking can be achieved.

4. The invention uses the matching of the guide mechanism and the transmission mechanism II, a user places a processing workpiece on the top of the box body II and is positioned between the two clamping plates, the user opens the electric telescopic rod to drive the toothed plate to move left and right, the electric telescopic rod extends to drive the toothed plate to move left, the toothed plate and the gear are in a meshing relationship, the gear is driven to rotate anticlockwise by taking the rotating rod as a shaft, the gear drives the two rotating rod II to move, so that the pull rod rotates on the surface of the rotating rod II, the rotating rod II is further driven to rotate on the surface of the rotating rod I, so that the two sliding sleeves III are driven to move oppositely on the surface of the sliding rod III, the two sliding sleeves III drive the two connecting blocks II to slide oppositely in the inner cavities of the connecting grooves II, the two connecting blocks II drive the two clamping plates to move oppositely to clamp and fix the processing workpiece, when the processing workpiece needs to be, and finally, the two clamping plates move reversely, so that the machined workpiece can be disassembled, the complexity of disassembling and assembling bolts is avoided, and the purpose of convenient disassembling and assembling of the machined workpiece can be achieved.

5. According to the invention, through the arrangement of the limiting mechanism, when the toothed plate moves left and right, the limiting sliding block is driven to slide in the inner cavity of the limiting sliding groove, so that the limiting effect is achieved on the left and right movement of the toothed plate, and the stability of the toothed plate during the left and right movement is improved.

6. According to the jig mounting device, due to the arrangement of the mounting base block, a user can mount the jig on the operating table through the mounting base block, and convenience is brought to the mounting of the jig.

Drawings

FIG. 1 is a schematic sectional front view of the structure of the present invention;

FIG. 2 is a top sectional view of a structure of the case of the present invention;

FIG. 3 is a perspective view of the structure of the mobile case of the present invention;

FIG. 4 is a schematic top sectional view of a second structure of the case of the present invention.

In the figure: 1. a first box body; 2. a first translation mechanism; 21. a first sliding rod; 22. a first sliding sleeve; 23. a first connecting block; 24. connecting a first connecting groove; 3. a first transmission mechanism; 31. a screw rod; 32. sleeving the silk; 33. a connecting rod; 34. a handle; 4. a mobile box; 5. a lateral movement mechanism; 51. a rectangular groove; 52. a second sliding rod; 53. a second sliding sleeve; 6. a locking mechanism; 61. a rectangular through hole; 62. fastening a screw rod; 63. fastening a solenoid; 7. a second box body; 8. a splint; 9. a guide mechanism; 91. a third sliding rod; 92. a third sliding sleeve; 93. a second connecting block; 94. connecting groove two; 10. a second transmission mechanism; 101. a first rotating shaft rod; 102. a pull rod; 103. a rotating rod; 104. a gear; 105. a second rotating shaft rod; 106. an electric telescopic rod; 107. a toothed plate; 108. a limiting mechanism; 1081. a limiting chute; 1082. a limiting slide block; 11. and installing the base block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: a precision machining jig comprises a box body I1, wherein an inner cavity of the box body I1 is provided with two translation mechanisms I2, each translation mechanism I2 comprises two slide rods I21 fixed in the inner cavity of the box body I1, the surfaces of the slide rods I21 are sleeved with sliding sleeves I22, the inner walls of the sliding sleeves I22 are in sliding connection with the slide rods I21, the tops of the sliding sleeves I22 are fixedly connected with connecting blocks I23, the tops of the connecting blocks I23 penetrate through the tops of the box body I1 and are fixedly connected with a movable box 4, two sides of the top of the box body I1 are respectively provided with connecting grooves I24 matched with the connecting blocks I23, a transmission mechanism I3 is arranged between the two translation mechanisms I2, the transmission mechanism I3 comprises a screw rod 31 rotatably connected to the front side of the inner cavity of the box body I1 through a bearing, the screw rod 31 is positioned between the two slide rods I21, the surface of the, one end of the connecting rod 33, which is far away from the screw sleeve 32, is fixedly connected with the first sliding sleeve 22, the rear end of the screw rod 31 penetrates through the rear side of the first box body 1 and is fixedly connected with the handle 34, through the matching use of the first translation mechanism 2 and the first transmission mechanism 3, when a user rotates the operating handle 34, the handle 34 drives the screw rod 31 to rotate, as the screw sleeve 32 and the screw rod 31 are in a threaded connection relationship, the screw sleeve 32 is driven to move back and forth on the surface of the screw rod 31, the screw sleeve 32 drives the two first sliding sleeves 22 to move back and forth on the surface of the first sliding rod 21 through the connecting rod 33, so that the first sliding sleeve 22 drives the first connecting block 23 to slide in an inner cavity of the first connecting groove 24, and further the first connecting block 23 drives the moving box 4 to move back and forth, and then the purpose of the back and forth translation movement can be achieved, the moving box 4, the top of the transverse moving mechanism 5 is provided with a second box body 7, the transverse moving mechanism 5 comprises two rectangular grooves 51 arranged on the front side and the rear side of the top of the moving box 4, the inner cavity of the rectangular groove 51 is fixedly connected with a second sliding rod 52, the surface of the second sliding rod 52 is sleeved with a second sliding sleeve 53, the inner wall of the second sliding sleeve 53 is in sliding connection with the second sliding rod 52, the top of the second sliding sleeve 53 extends to the top of the moving box 4 and is fixedly connected with the second box body 7, one side of the transverse moving mechanism 5 is provided with a locking mechanism 6, the locking mechanism 6 comprises two rectangular through holes 61 arranged on the front side and the rear side of the moving box 4, the inner cavity of the rectangular through hole 61 is in sliding connection with a fastening screw 62, one end of the fastening screw 62 is fixedly connected with the second sliding sleeve 53, the surface of the fastening screw 62 is in threaded connection with a fastening screw 63, one side of the fastening screw, the user can push the box body II 7 left and right, the box body II 7 drives the sliding sleeve II 53 to slide on the surface of the sliding rod II 52, the sliding sleeve II 53 drives the fastening screw rod 62 to slide in the inner cavity of the rectangular through hole 61, after moving left and right to a proper position, the user rotates the fastening screw tube 63, as the fastening screw tube 63 and the fastening screw rod 62 are in threaded connection, the fastening screw tube 63 is driven to approach the moving box 4 and contact with the moving box 4, the sliding sleeve II 53 can be locked by friction, the purpose of driving the box body II 7 to move left and right and lock can be achieved, the clamping plates 8 are arranged on both sides of the top of the box body II 7, the bottom of the clamping plate 8 is provided with the guide mechanism 9, the guide mechanism 9 comprises a sliding rod III 91 fixed in the inner cavity of the box body II 7, the sliding sleeve III 92 is connected on both sides of the surface of the sliding rod III 91 in a sliding manner, the top of the sliding sleeve III 92 is fixedly connected, the top of the second box body 7 is provided with a second connecting groove 94 matched with the second connecting block 93, the bottom of the guide mechanism 9 is provided with a second transmission mechanism 10, the second transmission mechanism 10 comprises a first rotating shaft rod 101 fixed at the bottom of the third sliding sleeve 92, the surface of the first rotating shaft rod 101 is rotatably connected with a pull rod 102, the bottom of the inner cavity of the second box body 7 is rotatably connected with a rotating rod 103 through a bearing, the top of the rotating rod 103 is fixedly connected with a gear 104, the front side and the rear side of the top of the gear 104 are both fixedly connected with a second rotating shaft rod 105, the surface of the second rotating shaft rod 105 is rotatably connected with the pull rod 102, the right side of the bottom of the inner cavity of the second box body 7 is fixedly connected with an electric telescopic rod 106, the output end of the electric telescopic rod 106 is fixedly connected with a toothed plate 107, the toothed plate 107 is meshed with the gear 104, the rear side of the toothed plate 107 is provided with a limiting, the user opens the electric telescopic rod 106 to drive the toothed plate 107 to move left and right, the electric telescopic rod 106 extends to drive the toothed plate 107 to move left, the toothed plate 107 and the gear 104 are in a meshed relationship, the gear 104 is driven to rotate counterclockwise around the rotating rod 103, the gear 104 drives the two rotating rod pairs 105 to move, so that the pull rod 102 rotates on the surface of the rotating rod pair 105, the rotating rod pair 105 rotates on the surface of the rotating rod pair 101, the two sliding sleeves three 92 move oppositely on the surface of the sliding rod pair 91, the two sliding sleeves three 92 drive the two connecting blocks two 93 to slide oppositely in the inner cavities of the connecting grooves two 94, the two connecting blocks two 93 drive the two clamping plates 8 to move oppositely to clamp and fix the machined workpiece, when release is required, the electric telescopic rod 106 retracts to drive the toothed plate 107 to move right, and finally the two clamping plates 8 move reversely, so that the machined workpiece can be detached, avoided the loaded down with trivial details of bolt dismouting, can reach the convenient purpose of processing work piece dismouting, stop gear 108 is including seting up the spacing spout 1081 in two 7 inner chambers rear sides of box, the inner chamber sliding connection of spacing spout 1081 has spacing slider 1082, spacing slider 1082's front side and pinion rack 107 fixed connection, setting through stop gear 108, when pinion rack 107 side-to-side motion, then drive spacing slider 1082 and slide at spacing spout 1081's inner chamber, spacing effect has been played pinion rack 107 side-to-side motion, stability when pinion rack 107 side-to-side motion has been improved, installation base block 11 has all been welded to the front side and the rear side of box 1 both sides, setting through installation base block 11, user's accessible installation base block 11 installs the tool on the operation panel, bring the convenience for the installation of tool.

The working principle is as follows: when the tool is used, the tool is installed on the operating platform through the installation base block 11, then a processing workpiece to be fixed is placed at the top of the box body II 7 and located between the two clamping plates 8, the two clamping plates 8 move oppositely or oppositely to clamp and release the processing workpiece through the matching use of the guide mechanism 9 and the transmission mechanism II 10, the purpose of convenient disassembly and assembly can be achieved, the processing workpiece can horizontally move left and right through the transverse moving mechanism 5 and the locking mechanism 6, and the processing workpiece can horizontally move back and forth through the translation mechanism I2 and the transmission mechanism I3, so that the purpose of convenient positioning and guiding can be achieved.

In summary, the following steps: the precision machining jig has the advantages that the two clamping plates 8 are driven to move oppositely through the second transmission mechanism 10 and the guide mechanism 9, fixing and dismantling of a machined workpiece can be achieved, complexity in assembling and disassembling of bolts is avoided, the purpose of convenience in assembling and disassembling can be achieved, the fixed machined workpiece can be moved in a front-back translational mode through the first transmission mechanism 3 and the first translation mechanism 2, the fixed machined workpiece can be moved in a left-right translational mode and locked through the transverse moving mechanism 5 and the locking mechanism 6, the purpose of convenience in positioning and guiding can be achieved, the problems that the machined workpiece needs to be fixed and positioned and guided when the jig is used, the machined workpiece is fixed on the jig through the bolts, fixing efficiency is low, disassembly is complex, positioning and guiding operation is performed on the machined workpiece, the positioning and guiding efficiency of the machined workpiece is low, and production efficiency of the machined workpiece is low are solved, the workpiece machining device can enable the machined workpiece to be convenient to disassemble and assemble and convenient to position and guide, and improves the production efficiency of the machined workpiece.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.

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

Claims

1. The utility model provides a precision finishing tool, includes box (1), its characterized in that: the inner chamber of box (1) is provided with two translation mechanism (2), is provided with drive mechanism (3) between two translation mechanism (2), the top of translation mechanism (2) is provided with removal case (4), the front side and the rear side at removal case (4) top all are provided with lateral shifting mechanism (5), one side of lateral shifting mechanism (5) is provided with lock solid mechanism (6), the top of lateral shifting mechanism (5) is provided with box two (7), the both sides at box two (7) top all are provided with splint (8), the bottom of splint (8) is provided with guiding mechanism (9), the bottom of guiding mechanism (9) is provided with drive mechanism two (10).

2. The precision machining jig of claim 1, characterized in that: translation mechanism (2) are including two slide bars (21) that are fixed in box (1) inner chamber, the surface cover of slide bar (21) is equipped with sliding sleeve (22), the inner wall and the slide bar (21) sliding connection of sliding sleeve (22), the top fixedly connected with connecting block (23) of sliding sleeve (22), the top of connecting block (23) run through to the top of box (1) and with remove case (4) fixed connection, the spread groove (24) with connecting block (23) looks adaptation are all seted up to the both sides at box (1) top.

3. The precision machining jig of claim 2, characterized in that: drive mechanism (3) include lead screw (31) of connecting in box (1) inner chamber front side through the bearing commentaries on classics, lead screw (31) are located between two slide bars (21), the surperficial threaded connection of lead screw (31) has silk cover (32), the equal fixedly connected with connecting rod (33) in both sides of silk cover (32), the one end and sliding sleeve (22) fixed connection of silk cover (32) are kept away from in connecting rod (33), the rear end of lead screw (31) runs through to the rear side and the fixedly connected with handle (34) of box (1).

4. The precision machining jig of claim 1, characterized in that: horizontal migration mechanism (5) are including two rectangular channel (51) of seting up in removal case (4) top front side and rear side, the inner chamber fixedly connected with slide bar two (52) of rectangular channel (51), the surface cover of slide bar two (52) is equipped with slide sleeve two (53), the inner wall and the slide bar two (52) sliding connection of slide sleeve two (53), the top of slide sleeve two (53) extend to the top of removal case (4) and with box two (7) fixed connection.

5. The precision machining jig of claim 4, wherein: the locking mechanism (6) comprises two rectangular through holes (61) arranged on the front side and the rear side of the movable box (4), the inner cavity of each rectangular through hole (61) is slidably connected with a fastening screw rod (62), one end of each fastening screw rod (62) is fixedly connected with the sliding sleeve II (53), the surface of each fastening screw rod (62) is in threaded connection with a fastening solenoid (63), and one side of each fastening solenoid (63) is in contact with the movable box (4).

6. The precision machining jig of claim 1, characterized in that: guiding mechanism (9) is including being fixed in the slide bar three (91) of box two (7) inner chamber, the equal sliding connection in both sides on slide bar three (91) surface has sliding sleeve three (92), the top fixedly connected with connecting block two (93) of sliding sleeve three (92), the top of connecting block two (93) run through to the top of box two (7) and with splint (8) fixed connection, connecting groove two (94) with connecting block two (93) looks adaptation are seted up at the top of box two (7).

7. The precision machining jig of claim 6, wherein: the transmission mechanism II (10) comprises a first rotating shaft rod (101) fixed at the bottom of the sliding sleeve III (92), the surface of the first rotating shaft rod (101) is connected with a pull rod (102) in a rotating mode, the bottom of the inner cavity of the box body II (7) is connected with a rotating rod (103) in a rotating mode through a bearing, a gear (104) is fixedly connected to the top of the rotating rod (103), a second rotating shaft rod (105) is fixedly connected to the front side and the rear side of the top of the gear (104), and the surface of the second rotating shaft rod (105) is connected with the pull rod (102) in a rotating mode.

8. The precision machining jig of claim 7, wherein: the right side fixedly connected with electric telescopic handle (106) of box two (7) inner chamber bottom, the output fixedly connected with pinion rack (107) of electric telescopic handle (106), pinion rack (107) and gear (104) meshing, the rear side of pinion rack (107) is provided with stop gear (108).

9. The precision machining jig of claim 8, wherein: limiting mechanism (108) are including offering limiting sliding groove (1081) in box two (7) inner chamber rear side, the inner chamber sliding connection of limiting sliding groove (1081) has limiting slide block (1082), the front side and pinion rack (107) fixed connection of limiting slide block (1082).

10. The precision machining jig of claim 1, characterized in that: and mounting base blocks (11) are welded on the front side and the rear side of the two sides of the first box body (1).