Precise center vice structure
By using a split internal screw design, a brush ring, and an O-ring to block cutting powder, the problems of rapid wear and zero-point position deviation in the center vise are solved, achieving a long vise life and high-precision machining.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2026-03-24
AI Technical Summary
The clamping blocks of existing center vises wear out quickly and have a short service life due to the coolant containing chips and metal powder. Furthermore, the lack of a fine-tuning mechanism for the center zero point position leads to increased machining accuracy and cost.
It adopts a split internal screw design, combined with a brush ring assembly and an O-ring to block cutting powder. The drive shaft is equipped with external screws with different thread directions and a triangular head adjustment function to achieve fine adjustment of the center zero point position.
It extends the service life of the clamps and drive shaft, reduces maintenance costs, and improves machining accuracy through center zero-point adjustment.
Smart Images
Figure CN224027376U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of mechanical processing machine's technical field, more particularly to a kind of mechanical processing machine accessory parts's technical category. BACKGROUND
[0002] Center vice is the tool for clamping and fixing workpiece to carry out mechanical processing. Its feature is that when clamping workpiece, two clamping blocks on both sides move to the center of vice simultaneously, so that the workpiece can be kept at the center zero point position of vice. This kind of center vice is suitable for clamping and fixing processing of symmetrical workpiece. In addition, when tool machine processes workpiece, cooling liquid is usually applied to cutting tool and workpiece to protect tool and workpiece from overheating and damage, so that the cooling liquid used will contain cutting chips and metal powder.
[0003] However, the two clamping blocks of the existing center vice are designed as a single part, i.e. they are made of two internal threaded parts to provide two external threaded parts combined with a transmission shaft, and the cooling liquid containing cutting chips and metal powder makes the transmission shaft inside be stuck in the chips and powder, and the chips and powder enter the internal threaded parts of the two clamping blocks, which causes rapid wear between the two clamping blocks and the transmission shaft, so that the entire clamping block must be replaced, thereby shortening the service life of the center vice and increasing the processing cost of workpiece.
[0004] Furthermore, the existing center vice does not have a fine adjustment mechanism for center zero point position, i.e. when the center zero point position of the existing center vice deviates after a period of use, it cannot be adjusted to zero, so there is a need to improve the existing center vice based on the above problems. SUMMARY
[0005] Therefore, in view of the above problems of the existing center vice, the main purpose of the utility model is to provide a center vice structure suitable for a wide range of applications; the secondary purpose of the utility model is to provide a center vice structure with chip and metal powder blocking function; another purpose of the utility model is to provide a center vice structure with center zero point position adjustment function.
[0006] To achieve the above object, the utility model discloses a precise center vice structure utilizes the following technical means, the utility model provides a precise center vice structure, it includes: a pedestal is equipped with a containing groove and is communicated with the top surface and two end surfaces of the pedestal, and is equipped with a zero point groove in the middle of the bottom of the containing groove, a plurality of zero point positioning pins are further equipped on the bottom of the pedestal, wherein the plurality of zero point positioning pins are provided to be sleeved on the machining table of the machine tool, a clamp is equipped with a first movable jaw block and a second movable jaw block that are opposite to each other and symmetric to the zero point groove, and a first embedding part and a second embedding part arranged below the first movable jaw block and the second movable jaw block are placed in the containing groove of the pedestal, wherein the first embedding part and the second embedding part are respectively equipped with a first inner screw part and a second inner screw part, and the screw directions of the inner threads of the first inner screw part and the second inner screw part are different, a transmission shaft is equipped with a first outer screw part and a second outer screw part on both sides of the intermediate pivot joint, and the first outer screw part and the second outer screw part are respectively sleeved with the first inner screw part and the second inner screw part of the first embedding part and the second embedding part of the clamp, and both ends of the transmission shaft are sleeved ends, and a bearing is connected with the zero point groove below and connected with the intermediate pivot joint of the transmission shaft above to support and position the transmission shaft, and the clamp holds or releases the workpiece by rotating the transmission shaft after the sleeved end of the transmission shaft is sleeved with the hand tool.
[0007] The zero point groove is a circular groove and is equipped with two combined perforations, the bearing extends a block from a circular base, the block is equipped with a supporting pivot hole to support the intermediate pivot joint of the transmission shaft, and two combined screw holes are arranged on the circular base to correspond to the two combined perforations of the pedestal, so that the bearing is combined with the zero point groove by two screws.
[0008] The intermediate pivot joint of the transmission shaft is a protruding circle, two ring grooves are arranged on both sides of the protruding circle to provide two O-rings, and a cover is arranged on the block of the bearing to cover the supporting pivot hole of the bearing and the intermediate pivot joint of the transmission shaft.
[0009] The first embedding part and the second embedding part of the clamp are separate parts, the first embedding part and the second embedding part are combined with the first movable jaw block and the second movable jaw block by a plurality of screws, and a protrusion and a groove are respectively arranged between the first embedding part and the second embedding part and the first movable jaw block and the second movable jaw block.
[0010] A guide groove and a guide block are respectively arranged between the two side edges of the first embedding part and the second embedding part of the clamp and the two side edges of the containing groove of the pedestal, and the first outer screw part and the second outer screw part are both acme type screw threads.
[0011] The first inner screw part and the second inner screw part of the clamp are provided as separate parts, and the first inner screw part and the second inner screw part are combined with a first sleeve hole and a second sleeve hole provided by the first embedding part and the second embedding part respectively by means of a plurality of screws.
[0012] The first inner screw part and the second inner screw part are provided as a triangular head combined with a screw sleeve, and the triangular head is provided with three equal division grooves to provide the plurality of screws to pass through and be connected, and the first embedding part and the second embedding part are provided with a plurality of screw holes corresponding to the three equal division grooves.
[0013] The inner side edges of the first inner screw part and the second inner screw part of the clamp are additionally provided with two brush ring assemblies, and the two brush ring assemblies are respectively provided as a brush ring and a cover body with a central through hole.
[0014] Two side grooves and two deep embedding grooves located on the two side grooves are provided on the two side edges of the base, and a lower positioning groove, a plurality of positioning holes and two limiting positioning pins are provided in the middle of the bottom of the base.
[0015] The middle of the two side grooves of the base is provided with two upper fixing grooves, and a first scale is respectively provided on the side edge of the base, and a second scale is provided on the top surface of the clamp.
[0016] The utility model discloses the technical means, achieves the following effects:
[0017] 1. The base bottom of the utility model is provided with a plurality of zero point positioning pins or a plurality of positioning holes, and the two side edges, the two side grooves, the two deep embedding grooves or / and the lower positioning groove of the base, so that the utility model clamp is suitable for traditional machining machines, semi-automatic and automatic tools, and the utility model clamp has wide applicability and high practicability.
[0018] 2. The utility model clamp is provided with brush rings or O-rings in the two brush ring assemblies of the clamp, which can block or remove metal chips and powders attached to the first outer screw part and the second outer screw part of the transmission shaft during the machining process, so as to prevent them from entering the first inner screw part and the second inner screw part, reduce the abrasion between the first inner screw part, the second inner screw part and the first outer screw part and the second outer screw part of the transmission shaft, prolong the service life of the first inner screw part, the second inner screw part and the transmission shaft, and maintain the machining accuracy of the workpiece.
[0019] Similarly, the two O-rings of the transmission shaft cooperate with the cover body to block the metal chips and powders from entering the gap between the middle pivot joint of the transmission shaft and the receiving pivot hole of the bearing, which reduces the abrasion and prolongs the service life of the bearing and the transmission shaft, and maintains the smoothness of the rotation transmission of the transmission shaft.
[0020] The first inner screw part and the second inner screw part of the vise are designed in a separated mode, that is, when the service life of the first inner screw part or the second inner screw part ends, only the new first inner screw part or the second inner screw part needs to be replaced, so that the whole clamp can be avoided to be replaced, and the use cost of the vise is reduced.
[0021] In addition, when the center zero point (i.e. the machining reference center point) of the vise has a deviation error, the first inner screw part and the second inner screw part are provided with triangular heads, the triangular heads can be rotated and adjusted, and the first scale on the side of the base is matched, so that the center zero point position of the clamp for clamping a workpiece can be adjusted and calibrated to zero, so that the machining error of the workpiece caused by the error of the center zero point position is avoided, and the machining precision of the workpiece is improved. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a perspective view of the precise center vise structure of the utility model.
[0023] Figure 2 It is a perspective view of the precise center vise structure of the utility model.
[0024] Figure 3 It is a side view of the precise center vise structure of the utility model.
[0025] Figure 4 It is another side view of the precise center vise structure of the utility model.
[0026] Figure 5 It is a top view of the precise center vise structure of the utility model.
[0027] Figure 6 It is a longitudinal sectional view of the precise center vise structure of the utility model.
[0028] Figure 7 It is a longitudinal sectional view of the precise center vise structure of the utility model.
[0029] Figure 8 It is a bottom view of the precise center vise structure of the utility model.
[0030] Figure 9 It is a schematic view of the precise center vise structure of the utility model implemented on a machining table of a machine tool.
[0031] Figure 10 It is a schematic view of the use and center zero point deviation error state of the precise center vise structure of the utility model.
[0032] Explanation of reference numerals: A-precision center vice structure; 1-base; 11-housing groove; 111-guide groove; 12-top surface; 13-end surface; 14-zero point groove; 141-center point; 142-combination through hole; 15-side groove; 151-deep embedding groove; 152-upper fixing groove; 16-zero point positioning pin; 17-lower positioning groove; 18-first scale; 19-positioning hole; 2-clamp; 21-first movable clamp block; 210-protrusion; 211-first embedding part; 2111-groove; 2112-guide block; 2113-screw hole; 212-first inner screw part; 2121-triangular head; 2122-screw sleeve; 2123-screw; 2124-trisection groove; 2125-inner thread; 213-first sleeve hole; 22-second movable clamp block; 220-protrusion; 221-second embedding part; 2211-groove; 2212-guide block; 2213-screw hole; 222-second inner screw part; 2221-triangular head; 2222-screw sleeve; 2223-screw; 2224-trisection groove; 2225-inner thread; 223-second sleeve hole; 23-screw; 24-brush ring assembly; 241-brush ring; 242-cover; 2421-center through hole; 25-second scale; 26-limiting positioning pin; 261-screw hole; 3-transmission shaft; 30-intermediate pivot joint; 301-protruding circle; 302-ring groove; 303-ring groove; 304-O ring; 305-O ring; 31-first outer screw part; 32-second outer screw part; 33-sleeved end; 34-sleeved end; 4-socket; 41-circular base; 411-combination screw hole; 42-block; 421-accepting pivot hole; 43-screw; 44-cover; 441-center through hole; 5-workpiece; 5a-calibration gauge; 6-machining table; 61-positioning hole; 7-hand tool. DETAILED DESCRIPTION
[0033] The utility model provides a precision center vice structure, as shown in Figure 1 , Figure 9 and Figure 10 , provides the workpiece 5 clamping of traditional type processing machine, semi-automatic, full-automatic etc.
[0034] The base 1, as shown in Figure 2 , Figure 6 and Figure 8As shown, a receiving groove 11 is provided and communicates with the top surface 12 and the two end surfaces 13 of the base 1, and a zero point groove 14 is provided in the middle of the bottom of the receiving groove 11, where the zero point refers to the machining reference center point of the workpiece 5, that is, the center point 141 of the zero point groove 14 is the machining reference center point (commonly known as zero point), wherein the zero point groove 14 is provided as a circular groove and is internally provided with two combined through holes 142; further, two side grooves 15 are provided on the two side edges of the base 1, and two deep embedding grooves 151 are provided on the two side grooves 15 and have a relatively deep depth, and two upper fixing grooves 152 are provided in the middle of the two side grooves 15, and a plurality of positioning holes 19 are provided on the bottom of the base 1, wherein the side grooves 15 cooperate with clamps, and the plurality of positioning holes 19 cooperate with an equal number of positioning columns, so that the vise of the utility model can be fixed on the machining table provided on the traditional machining machine; further, a plurality of zero point positioning pins 16 and a lower positioning groove 17 are provided on the bottom of the base 1, wherein the plurality of zero point positioning pins 16 cooperate with the two deep embedding grooves 151 to provide a mechanical hand to grab the vise of the utility model and fix the plurality of zero point positioning pins 16 into a plurality of positioning holes 61 provided on the machining table 6 of the relatively advanced machine tool, so as to facilitate clamping and fixing the workpiece 5 and aligning the zero point for machining.
[0035] As shown, Figures 2 to 4 、 Figure 6 a first movable jaw 21 and a second movable jaw 22 are provided opposite to each other and symmetrically to the center point 141 of the zero point groove 14, and a first embedding part 211 and a second embedding part 221 provided below the first movable jaw 21 and the second movable jaw 22 are placed in the receiving groove 11 of the base 1, and two guide grooves 111 and a guide block 2112 and a guide block 2212 are respectively provided between the two side edges of the first embedding part 211 and the second embedding part 221 and the two side edges of the receiving groove 11 of the base 1; wherein the first embedding part 211 and the second embedding part 221 are respectively provided with a first inner screw part 212 and a second inner screw part 222, and the screw directions of an inner thread 2125 and an inner thread 2225 provided on the first inner screw part 212 and the second inner screw part 222 are different.
[0036] Further, the first embedding part 211 and the second embedding part 221 are both provided as separate components, and a plurality of screws 23 are used to combine the first embedding part 211 and the second embedding part 221 with the first movable jaw 21 and the second movable jaw 22; in addition, a protrusion 210, a recess 2111, a protrusion 220, and a recess 2211 are respectively provided between the first embedding part 211 and the second embedding part 221 and the first movable jaw 21 and the second movable jaw 22; further, the first inner screw part 212 and the second inner screw part 222 of the clamp 2 are both provided as separate components, and a plurality of screws are used to pass through a first sleeve hole 213 and a second sleeve hole 223 provided on the first embedding part 211 and the second embedding part 221 to combine the first inner screw part 212 and the second inner screw part 222.
[0037] Further, the first inner screw portion 212 and the second inner screw portion 222 are provided with a triangular head 2121 and a triangular head 2221, respectively, and the triangular head 2121 and the triangular head 2221 are respectively provided with three equal division grooves 2124 and three equal division grooves 2224, and the first embedding portion 211 and the second embedding portion 221 are respectively provided with a plurality of screw holes 2113 and a plurality of screw holes 2213 corresponding to the three equal division grooves 2124 and the three equal division grooves 2224, so as to provide a plurality of screws 2123 and a plurality of screws 2223 respectively penetrating the three equal division grooves 2124 and the three equal division grooves 2224 and being screwed into the plurality of screw holes 2113 and the plurality of screw holes 2213; in addition, the inner sides of the first inner screw portion 212 and the second inner screw portion 222 are respectively provided with a brush ring assembly 24, and the brush ring assembly 24 is respectively composed of a brush ring 241 (or an O-ring made of rubber or plastic material instead of the brush ring 241) and a cover 242 with a central through hole 2421.
[0038] In addition, two limiting positioning pins 26 are respectively arranged at two ends of the accommodating groove 11 of the base 1, as shown in Figure 6 and Figure 7 , wherein the two limiting positioning pins 26 are locked into corresponding screw holes 261 to limit the excessive opening between the first movable jaw block 21 and the second movable jaw block 22 of the vice 2, so as to prevent the vice from being insufficiently opened, that is, to limit the maximum distance between the first embedding portion 211 and the second embedding portion 221, so as to prevent the opening of the vice from being excessive.
[0039] The transmission shaft 3 is provided with a first outer screw portion 31 and a second outer screw portion 32 at two sides of a middle pivot connection 30, as shown in Figure 2 , Figure 5 and Figure 6 , and the first outer screw portion 31 and the second outer screw portion 32 are respectively sleeved with the first inner screw portion 212 and the second inner screw portion 222 of the first embedding portion 211 and the second embedding portion 221 of the vice 2, and the first outer screw portion 31 and the second outer screw portion 32 are both provided with ACKM threads to improve the situation that the WHITWORTH screw threads are prone to be broken, and to improve the stability and precision of the transmission of the vice; wherein the middle pivot connection 30 is provided with a protruding circle 301, and a ring groove 302 and a ring groove 303 are respectively arranged at two sides of the protruding circle 301 to provide an O-ring 304 and an O-ring 305; in addition, two ends of the transmission shaft 3 are respectively provided with a sleeving end 33 and a sleeving end 34, and in the embodiment, the sleeving end 33 is provided with an inner hexagonal groove, and the sleeving end 34 is provided with a hexagonal head.
[0040] The base 4, as shown in Figure 2 , Figure 5 and Figure 6 , is connected with the zero slot 14 below and the middle pivot 30 of the transmission shaft 3 above to receive and position the transmission shaft 3, and the base 4 is composed of a circular base 41 upwardly extending a block 42, the circular base 41 is circular to have the freedom of deflection, and the block 42 is provided with a receiving pivot hole 421 to receive the middle pivot 30 of the transmission shaft 3, and the circular base 41 is provided with two combination screw holes 411 corresponding to the two combination through holes 142 of the zero slot 14 of the base 1 to facilitate the combination of the base 4 and the zero slot 14 of the base 1 by two screws 43; wherein a cover 44 is added to the block 42 to cover the receiving pivot hole 421 and the middle pivot 30 of the transmission shaft 3.
[0041] Therefore, the utility model provides a kind of better solution to the structure of precision center vice, as shown in Figure 8 and Figure 9 , and the plurality of zero positioning pins 16, the positioning hole 19, the two side slots 15, the two deep embedded slots 151 or / and the lower positioning slot 17 etc. are arranged at the bottom of the base 1, so that the utility model vice is suitable for traditional machining tools, semi-automatic and fully automatic tools, so the utility model vice has wide applicability and high practicability.
[0042] When using the utility model precision center vice structure A, as shown in Figure 1 and Figure 7 , the clamp 2 can be opened in advance, and then the workpiece 5 is placed in the middle and put between the first movable jaw block 21 and the second movable jaw block 22 of the clamp 2 by the second scale 25 on the top surface of the clamp 2, and then the transmission shaft 3 is rotated by sleeving the sleeving end 33 or the sleeving end 34 of the transmission shaft 3 with the hand tool 7, and the first outer screw part 31 and the second outer screw part 32 with different outer thread directions of the transmission shaft 3 are used to rotate the transmission shaft 3 in the forward or reverse direction, which can simultaneously drive the inner thread 2125 and the inner thread 2225 arranged on the first movable jaw block 21 and the second movable jaw block 22 to displace, so that the first movable jaw block 21 and the second movable jaw block 22 can move close to or away from each other, and the first movable jaw block 21 and the second movable jaw block 22 can move close to or away from the center point of the workpiece 5 to clamp or release the workpiece 5.
[0043] Please refer to Figure 2 , Figure 6 and Figure 7As shown, and the utility model vise for prolonging the service life of the first inner screw part 212, the second inner screw part 222 and the transmission shaft 3 and maintaining the machining accuracy of workpiece 5, the two brush ring assemblies 24 of the clamp 2 are used to block or remove the metal chips and powder on the first outer screw part 31 and the second outer screw part 32 of the transmission shaft 3 during the machining process, so as to prevent them from entering the first inner screw part 212 and the second inner screw part 222, thereby reducing the wear between the first inner screw part 212, the second inner screw part 222, the first outer screw part 31 and the second outer screw part 32 of the transmission shaft 3, prolonging the service life of the first inner screw part 212, the second inner screw part 222 and the transmission shaft 3, and maintaining the machining accuracy of workpiece 5; similarly, the O-ring 304 and the O-ring 305 of the transmission shaft 3 cooperate with the cover 44 of the support 4 to block the metal chips and powder from entering the gap between the intermediate pivot joint 30 of the transmission shaft 3 and the receiving pivot hole 421 of the support 4, and can reduce the wear, thereby prolonging the service life of the support and the transmission shaft 3 and maintaining the smoothness of the transmission shaft 3 during operation.
[0044] At the same time, in order to reduce the use cost of the utility model vise, the first inner screw part 212 and the second inner screw part 222 are designed in a separated manner, that is, when the service life of the first inner screw part 212 or the second inner screw part 222 ends, the new first inner screw part 212 or the second inner screw part 222 can be replaced.
[0045] In addition, when the position error of the center zero point (i.e. the machining reference center point) occurs after the utility model vise is used for a period of time, please refer to Figure 6 、 Figure 7 and Figure 10 As shown, the first inner screw part 212 and the second inner screw part 222 are provided with the triangular head 2121 and the three-equal division groove 2124, the triangular head 2221 and the three-equal division groove 2224, so that the position of the triangular head 2121 and the three-equal division groove 2124 relative to the first embedding part 211, and the position of the triangular head 2221 and the three-equal division groove 2224 relative to the second embedding part 221 can be adjusted by loosening the screws 2123 and the screws 2223, and the process of adjusting the position of the zero point is also provided with the screws 43 of the round base 41 of the support 4, which is circular in shape and has a degree of freedom, so that the operation of adjusting the position of the zero point is more convenient; in addition, the first scale 18 on the side of the base 1 can be used to adjust the center zero point position of the workpiece 5 clamped by the clamp 2, so as to avoid the machining error of the workpiece 5 caused by the error of the center zero point position, and further improve the machining accuracy of the workpiece 5. For example, the first movable jaw 21 and the second movable jaw 22 of the utility model vise clamp a correction rule 5a with a standard width of 40mm, and the center zero point position of the workpiece 5 is adjusted by the first scale 18 on the side of the base 1, so that the machining accuracy of the workpiece 5 is improved.Figure 10 As shown, after the transmission shaft 3 is fixed to the bearing 4, the center point of the correction gauge 5a is deviated to the right side, and then the screws 2123 and 2223 are loosened, and the triangular heads 2121 and 2221 are rotated to adjust the three equal division grooves 2124 and 2224, and the threaded sleeves 2122 and 2222 are respectively or simultaneously screwed on the transmission shaft 3 through the internal threads 2125 and 2225 in the sleeves, so as to finely adjust the first and second embedded parts 211 and 221, and drive the first and second movable jaw blocks 21 and 22 to move, and the center point of the correction gauge 5a is adjusted to move to the left side, and then the screws 2123 and 2223 are tightened to fix the positions of the triangular heads 2121 and 2221.
[0046] Therefore, when the machining workpiece 5 is first assembled or initially used, the first and second movable jaw blocks 21 and 22 can be adjusted to the center point zero point or zeroed. The bearing 4 in the center of the screw rod of the transmission shaft 3 and the center point adjustment of the triangular heads 2121 and 2221 on both sides thereof are practical in use. Since the machining precision of the domestic machining machine cannot meet the demand of the integrated vice product, the vice of the present application is provided with the bearing 4 having the circular base 41 below in the middle of the transmission shaft 3, and the triangular heads 2121 and 2221 having the three equal division grooves 2124 and 2224 and the threaded sleeves 2122 and 2222 with internal threads on both sides of the vice, so as to adjust the displacement of the first and second movable jaw blocks 21 and 22 on the transmission shaft 3, and to adjust and control the center point position, so as to effectively correct the zero point before the machining or correction of the workpiece.
Claims
1. A precision center vice structure, characterized by comprising: The utility model relates to a tool holder, comprising: a base provided with a receiving groove, the receiving groove is communicated with the top surface of the base and the two end surfaces of the base, and a zero point groove is arranged in the middle of the bottom of the receiving groove; a plurality of zero point positioning pins are arranged on the bottom of the base, wherein the plurality of zero point positioning pins are provided to be sleeved on the machining table of a tool machine; a clamp is provided with a first movable clamp block and a second movable clamp block which are opposite to each other and symmetrical to the zero point groove, and a first embedding part and a second embedding part arranged below the first movable clamp block and the second movable clamp block are arranged in the receiving groove of the base; wherein the first embedding part and the second embedding part are respectively provided with a first inner screw part and a second inner screw part, and the screw directions of the inner threads of the first inner screw part and the second inner screw part are different; a transmission shaft is provided with a first outer screw part and a second outer screw part on the two sides of the middle pivot joint, the first outer screw part and the second outer screw part are respectively sleeved with the first inner screw part and the second inner screw part of the first embedding part and the second embedding part of the clamp, and the two ends of the transmission shaft are sleeving ends; and a support is arranged below the zero point groove and above the middle pivot joint of the transmission shaft to support and position the transmission shaft; by using a hand tool to sleeve the sleeving end of the transmission shaft and then rotating the transmission shaft, the clamp can clamp or release the workpiece. The zero point groove is a circular groove, two combined through holes are arranged in the circular groove, the support extends a block body upward from a circular base, the block body is provided with a supporting pivot hole to support the middle pivot joint of the transmission shaft, two combined screw holes are arranged on the circular base to correspond to the two combined through holes of the base, and the support is combined with the zero point groove by two screws.
2. The precision center vice structure of claim 1, wherein: The middle pivot joint of the transmission shaft is a protruding circle, two ring grooves are arranged on the two sides of the protruding circle to provide two O-rings, the block body of the support is provided with a cover body with a central through hole to cover the supporting pivot hole of the support and the middle pivot joint of the transmission shaft.
3. The precision center vice structure of claim 2, wherein: The first embedding part and the second embedding part of the clamp are separate bodies, the first embedding part and the second embedding part are combined with the first movable clamp block and the second movable clamp block by a plurality of screws, and a protrusion and a groove are respectively arranged between the first embedding part, the second embedding part, the first movable clamp block and the second movable clamp block.
4. The precision center vice structure of claim 1 wherein: A guide groove and a guide block are respectively arranged between the two side edges of the first embedding part and the second embedding part of the clamp and the two side edges of the receiving groove of the base.
5. The precision center vice structure of claim 4, wherein: The first outer screw part and the second outer screw part are both acme type screw threads.
6. The precision center vice structure of claim 1 wherein: The first inner screw part and the second inner screw part of the clamp are separate bodies, the first inner screw part and the second inner screw part are respectively combined with a first sleeve hole and a second sleeve hole arranged on the first embedding part and the second embedding part by a plurality of screws.
7. The precision center vice structure of claim 6, wherein: The first inner screw part and the second inner screw part are both triangular head combined with a screw pipe sleeve, the triangular head is provided with three equal division grooves to provide the plurality of screws to pass through and connect, and the first embedding part and the second embedding part are respectively provided with a plurality of screw holes corresponding to the three equal division grooves arranged thereon.
8. The precision center vice structure of claim 1 wherein: Two brush ring assemblies are additionally arranged on the inner side edges of the first inner screw part and the second inner screw part of the clamp, and the two brush ring assemblies are respectively composed of a brush ring and a cover body with a central through hole.
9. The precision center vice structure of claim 1 wherein: Two side grooves and two deep embedding grooves are arranged on the two side edges of the base, and a lower positioning groove, positioning holes and two limiting positioning pins are arranged in the middle of the bottom of the base.
10. The precision center vice structure of claim 9, wherein: Two upper fixing grooves are arranged in the middle of the two side grooves of the base, a first scale is arranged on the side edge of the base, and a second scale is arranged on the top surface of the clamp.