CN114211263A - Concealed machine tool beam structure with adjustable precision - Google Patents

Abstract

The invention relates to the technical field of machine tools, in particular to a concealed machine tool beam structure with adjustable precision, which comprises an outer beam frame body and an inner beam, wherein the outer beam frame body and the inner beam extend along the left and right transverse directions; the outer crossbeam framework includes backup pad and the first backup pad of going up after first, the inner beam includes back holding surface and goes up the holding surface, all wear to be equipped with precision adjusting bolt on backup pad and the first backup pad after first, precision adjusting bolt can adjust the interval between backup pad and the back holding surface after first and the interval between backup pad and the last holding surface after first, all set up the mounting hole that supplies precision adjusting bolt to pass on backup pad and the first backup pad after first.

Description

Concealed machine tool beam structure with adjustable precision

Technical Field

The invention relates to the technical field of machine tools, in particular to a concealed machine tool beam structure with adjustable precision.

Background

The existing numerical control machine tool, such as a milling machine, a boring machine and a lathe, is large in size, and a cross beam is used as a bearing part to install other heavy guide rails, main shafts and other parts. The crossbeam of lathe mostly adopts integrated into one piece's casting, and the knife rest of lathe also can be under the direction of crossbeam, and reciprocating motion is made back and forth along the X axle direction, nevertheless because the crossbeam span is big, and knife rest and crossbeam dead weight are heavier, will lead to the crossbeam to take place to warp to the radial runout of work piece is processed in the influence, and then influences the processingquality of being processed the work piece. Therefore, a reinforcing structure is usually arranged in the existing machine tool beam to resist bending deformation, such as a welding beam for a numerical control machine tool disclosed in chinese patent with application number 201821715764.9, which includes a rectangular beam frame with a hollow inner cavity, an X-shaped reinforcing rib plate penetrating through the whole rectangular beam frame is fixed in the inner cavity of the rectangular beam frame along the length direction, and a plurality of longitudinal reinforcing rib plates are fixed in the inner cavity of the rectangular beam frame at equal intervals in the direction perpendicular to the X-shaped reinforcing rib plate, the longitudinal reinforcing rib plates are fixedly connected with the X-shaped reinforcing rib plate, the longitudinal reinforcing rib plates are connected with the X-shaped reinforcing rib plate to form an end face whole reinforcing rib plate, a plurality of welding through holes are uniformly arranged on two corresponding sides of the rectangular beam frame respectively, and the welding through holes correspond to the longitudinal reinforcing rib plates respectively. The welding beam of this patent cooperatees through vertical deep floor, X type deep floor and rectangle crossbeam framework, forms whole full-welded formula structure, and whole rigidity is good, stability is good, difficult easy deformation, but only strengthens obviously that intensity is limited through deep floor.

Disclosure of Invention

The invention is to improve the problems existing in the prior art, namely the invention aims to provide a concealed machine tool beam structure with adjustable precision, which comprises an outer beam frame body and an inner beam, wherein the outer beam frame body and the inner beam extend along the left and right transverse directions; the outer crossbeam framework is including being located the inner beam rear just is the first back backup pad of upright form and is located the inner beam top just is the first backup pad of going up of tiling form, the inner beam includes towards the rear and is the back holding surface of upright form and towards the top and be the last holding surface of tiling form, first back backup pad with all wear to be equipped with precision adjusting bolt on the first backup pad, precision adjusting bolt can adjust first back backup pad with interval between the back holding surface and first last backup pad with go up interval between the holding surface, first back backup pad with all seted up the confession on the first backup pad the mounting hole that precision adjusting bolt passed.

Preferably, the precision adjusting bolt includes a screw rod and an adjusting nut screwed on the screw rod, the screw rod passes through the outer beam frame body, one end of the screw rod abuts against the inner beam, the adjusting nut includes a top pulling portion, a moving portion and a rotating portion which are fixedly connected in sequence, the top pulling portion is located between the outer beam frame body and the inner beam, the cross-sectional area of the top pulling portion is larger than the size of the mounting hole, the moving portion is arranged in the mounting hole in a penetrating manner and can move along the screw rod, and the rotating portion is located outside the outer beam frame body.

Preferably, four precision adjusting bolts arranged in a shape like a Chinese character tian are arranged in the middle of the first upper support plate in the left-right direction, a plurality of vertical rib plates and first connecting rib plates perpendicular to the first upper support plate are further fixed on the first upper support plate, the vertical rib plates extend in the front-back direction, the front end and the rear end of each vertical rib plate are fixed on the inner wall of the outer cross beam frame body, the vertical rib plates are arranged side by side in the left-right direction, the first connecting rib plates are fixed between any two adjacent vertical rib plates, the first connecting rib plates extend in the left-right direction, the two ends of each first connecting rib plate are respectively and fixedly connected with the vertical rib plates, and each precision adjusting bolt is surrounded by the front first connecting rib plate, the rear connecting rib plate and the left-right connecting rib plates.

Preferably, the upright rib plates and the first connecting rib plates are located between two adjacent annular rib plates, second connecting rib plates perpendicular to the first upper support plate are fixedly connected between the upright rib plates and the annular rib plates, the second connecting rib plates extend in the left-right direction, one end of each second connecting rib plate is fixedly connected with the upright rib plate, and the other end of each second connecting rib plate is fixedly connected with the annular rib plate.

Preferably, the first rear support plate is provided with two precision adjusting bolts which are consistent in height and located between two adjacent annular rib plates at the middle position in the left-right direction, the first rear support plate is further fixed with two straight rib plates perpendicular to the first rear support plate, the right ends of the straight rib plates are fixedly connected with the right annular rib plate, the left ends of the straight rib plates are fixedly connected with the left annular rib plate, and the two straight rib plates are located above and below the precision adjusting bolts respectively.

Preferably, the annular rib plate is perpendicular to the first rear support plate, and the outer edge of the annular rib plate is completely attached to and fixedly connected with the inner wall of the outer cross beam frame body.

Preferably, any two adjacent annular rib plates form a V-shaped structure with consistent angles with each other.

Preferably, the inner edge of the annular rib plate is provided with a supporting edge which extends along the front-back direction and is positioned below the inner cross beam, and the lower surface of the inner cross beam is in a flat-laying shape.

Preferably, the inner cross beam is internally provided with a second cavity, the second cavity is internally provided with a plurality of second rib plates which are distributed along the left-right direction, the second rib plates are perpendicular to the rear supporting surface, and the outer edges of the second rib plates are completely attached to and fixedly connected with the inner wall of the inner cross beam.

Preferably, any two adjacent second rib plates form a V-shaped structure with consistent angles with each other.

Has the advantages that:

the inner cross beam fills most of the space of the first cavity, the strength of the outer cross beam frame body is further improved, and the collapse of the middle part of the outer cross beam frame body towards the front lower part is effectively reduced; the annular rib plate can not only support the outer cross beam frame body outwards to improve the strength of the outer cross beam frame body, but also play a role in pulling when the outer cross beam frame body sinks forwards and downwards, so that the part above the rear part of the outer cross beam frame body pulls the part below the front part through the annular rib plate, and the degree of sinking of the outer cross beam frame body forwards and downwards is reduced;

utilize precision adjusting bolt to enlarge the interval of the back holding surface of first back backup pad and inner beam and the interval of the last holding surface of first back backup pad and inner beam, under the prerequisite of inner beam rigidity, the displacement upwards produces in the first backup pad, the backup pad produces the displacement backwards behind the second, make outer beam framework whole by back top lift, thereby carry the part of collapsing down to the front in the outer beam framework back top lift, eliminate outer beam framework and collapse down to the front, and then ensure the position accuracy of knife rest.

Drawings

FIG. 1 is a schematic view of an outer beam frame in a precision adjustable concealed machine tool beam structure according to the present invention;

FIG. 2 is a schematic structural view of an outer beam frame;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a schematic structural view of an annular rib plate;

FIG. 5 is a schematic layout view of annular rib plates;

FIG. 6 is a schematic view of the structure and mounting position of the precision adjusting bolt;

FIG. 7 is a rib plate net around four precision adjusting bolts penetrating through the first upper support plate;

FIG. 8 is a rib plate net around two precision adjusting bolts penetrating through the first rear support plate;

FIG. 9 is an internal structure of the inner cross member;

in the figure: 1. outer beam framework, 2, the inner beam, 3, the precision adjusting bolt, 11, first cavity, 12, annular gusset, 121, the centre bore, 122, support edge, 13, first last backup pad, 14, first back backup pad, 15, first bottom suspension board, 16, first preceding backup pad, 21, the second cavity, 22, the second gusset, 23, go up the holding surface, 24, back holding surface, 31, the screw rod, 32, adjusting nut, 321, the top portion of pulling, 322, the removal portion, 323, the rotation portion, 41, first connection gusset, 42, the second connection gusset, 43, upright gusset, 44, straight gusset.

Detailed Description

The following specific examples are given by way of illustration only and not by way of limitation, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the examples without inventive faculty, and yet still be protected by the scope of the claims.

The invention relates to a concealed machine tool beam structure with adjustable precision, which comprises an outer beam frame body 1 and an inner beam 2 which extend along the left and right transverse directions, wherein when in use, a guide rail is usually fixed on the front side surface of the outer beam frame body 1, then a tool rest is installed on the guide rail for use, the gravity of the tool rest, the guide rail and other components acts on the outer beam frame body 1, the left end and the right end of the outer beam frame body 1 are usually erected on supporting legs and can be supported by the supporting legs, and the middle part of the outer beam frame body 1 can generate a deformation tendency of collapsing forwards and downwards because the middle part of the outer beam frame body 1 is not effectively supported by the outside. In this embodiment, a first cavity 11 is formed inside the outer beam frame 1, the first cavity 11 is also a long-strip-shaped cavity extending in the left-right direction, and the cross section of the first cavity 11 is uniform at all places; an annular rib plate 12 is arranged in the first cavity 11, the inner edge contour and the outer edge contour of the annular rib plate 12 can be in any closed shape, wherein part or all of the outer edge of the annular rib plate 12 is fixedly connected with the inner wall of the outer beam frame body 1 to improve the support strength of the outer beam frame body, a central hole is defined by the inner edge of the annular rib plate, the annular rib plates 12 are arranged along the left and right direction, the inner beam 2 is positioned in the first cavity 11 and passes through the central hole 121 to be erected on the annular rib plate 12, the inner beam 2 is fixedly connected with the annular rib plate 12 or the outer beam frame body 1, the length of the inner beam 2 is more than half of the length of the outer beam frame body 1, the inner beam 2 transversely stretches in the middle part of the first cavity 11, the inner beam 2 fills most of the space of the first cavity 11, and further improves the strength of the outer beam frame body 1, effectively reduce outer crossbeam framework 1 middle part to the front below and cave in. The outer cross beam frame body 1 can be formed by welding a plurality of plates, so that a first cavity 11 is formed, the welding process is simple, convenient and quick, and the cost is low; the annular rib plate 12 can not only support the outer cross beam frame body 1 outwards to improve the strength of the outer cross beam frame body 1, but also pull the outer cross beam frame body 1 forwards and downwards to collapse, so that the part above the back of the outer cross beam frame body 1 is pulled to the part below the front part through the annular rib plate 12, and the degree of collapse of the outer cross beam frame body 1 forwards and downwards is reduced.

It is preferable that the outer beam frame 1 is a square frame and includes a front and a back first front supporting plate 16, a first back supporting plate 14, and a top and a bottom first upper supporting plate 13 and a first bottom supporting plate 15, which are arranged side by side, the four are welded to form the outer beam frame 1, wherein the first back supporting plate 14 is located behind the inner beam 2 and is upright, the first upper supporting plate 13 is located above the inner beam 2 and is tiled, the inner beam 2 includes a back supporting surface 24 facing to the back and is upright and a top supporting surface 23 facing to the top and is tiled, the first back supporting plate 14 and the first upper supporting plate 13 are both penetrated with the precision adjusting bolt 3, the precision adjusting bolt 3 can adjust the distance between the first back supporting plate 14 and the back supporting surface 24 and the distance between the first upper supporting plate 13 and the top supporting surface 23, the first rear supporting plate 14 and the first upper supporting plate 13 are provided with mounting holes for the precision adjusting bolts 3 to pass through. When the outer beam frame 1 collapses forward and downward, so that the position accuracy of the tool rest mounted on the outer beam frame 1 is affected, the accuracy adjusting bolt 3 is utilized to enlarge the distance between the first rear supporting plate 14 and the rear supporting surface 24 of the inner beam 2 and the distance between the first upper supporting plate 13 and the upper supporting surface 23 of the inner beam, on the premise that the position of the inner beam 2 is fixed, the first upper supporting plate 13 generates upward displacement, the second rear supporting plate 14 generates rearward displacement, so that the outer beam frame 1 is integrally lifted and pulled backward and upward, and the portion collapsing forward and downward in the outer beam frame 1 is lifted and pulled backward and upward to eliminate the collapsing forward and downward of the outer beam frame 1, thereby ensuring the position accuracy of the tool rest. The precision adjusting bolt 3 in this embodiment includes a screw 31 and an adjusting nut 32 screwed on the screw 31, the screw 31 passes through the outer beam frame 1, and one end of the screw 31 abuts against the inner beam 2, because the area of the end of the screw 31 abutting against the inner beam 2 is small, the force transmission effect is not good, a cushion plate can be selected to be arranged between the screw 31 and the inner beam 2 according to the actual situation, so as to ensure good and stable abutting of the screw 31 against the inner beam 2, and the screw 31 is considered to abut against the inner beam 2 in this embodiment regardless of whether the cushion plate is used or not; the adjusting nut 32 includes a top-pulling portion 321, a moving portion 322 and a rotating portion 323 which are fixedly connected in sequence, the top-pulling portion 321 is located between the outer beam frame 1 and the inner beam 2, the cross-sectional area of the top-pulling portion is larger than the size of the mounting hole, the moving portion 322 is inserted into the mounting hole and can move along the screw rod 31, the rotating portion 323 is located outside the outer beam frame 1, as long as the rotating portion 323 in the adjusting nut 32 is rotated, the entire adjusting nut 32 can be rotated around the screw rod 31 and can move along the extending direction of the screw rod 31, the moving portion 322 can move in the mounting hole in the moving process, and the top-pulling portion 321 cannot pass through the mounting hole and pushes out the first rear support plate 14 and the first upper support plate 13 in the direction away from the inner beam 2, so that the outer beam frame 1 is pulled towards the upper rear direction.

Specifically, four precision adjusting bolts 3 arranged in a matrix shape are arranged in the middle of the first upper support plate 13 in the left-right direction, so as to mainly lift the outer beam frame 1, and because the precision adjusting bolts 3 only support the first rear support plate 14 and the first upper support plate 13 through the top pull portions 321 of the adjusting nuts 32, the top pull action is limited to discrete points, and the support action on the outer beam frame 1 is not significant, in this embodiment, a plurality of vertical rib plates 43 perpendicular to the first upper support plate 13 and first connecting rib plates 41 are further fixed on the first upper support plate 13, the vertical rib plates 43 and the first connecting rib plates 41 are both located in the first cavity 11, the vertical rib plates 43 extend in the front-back direction, and the front end and the rear end of each vertical rib plate 43 are both fixed on the inner wall of the outer beam frame 1, so that the vertical rib plates 43 and the first upper support plate 13, the outer beam frame 1, The first front support plate 16 and the first rear support plate 14 are fixedly connected, the upright rib plates 43 are arranged side by side along the left-right direction, the first connecting rib plate 41 is fixed between any two adjacent upright rib plates 43, the first connecting rib plate 41 extends along the left-right direction, two ends of the first connecting rib plate 41 are respectively fixedly connected with the upright rib plates 43, preferably, the first connecting rib plate 41 is also fixedly connected with the first upper support plate 13, and each precision adjusting bolt 3 is surrounded by the front and rear two upright rib plates 41 and the left and right upright rib plates 43, so that the upright rib plates 43 and the first connecting rib plates 41 form a rib plate network which surrounds the precision adjusting bolts 3, when one part of the first upper support plate 13 is supported upwards by the precision adjusting bolts 3, the supported part can be driven by the upright rib plates 43 and the first connecting rib plates 41 to move upwards together with the surrounding parts, the part that the gusset net that is constituteed by upright gusset 43 and first connection gusset 41 on first last backup pad 13 covered can both be under precision adjusting bolt 3's effect up produce the displacement to upward carry first last backup pad 13 and pull, and then all upwards carry first preceding backup pad 16 and first back backup pad 14 and pull, effectively improve the top supporting effect of precision adjusting bolt 3 to outer beam framework 1, thereby improve and alleviate the ability that outer beam framework 1 sinks to the below of advancing. In a further improvement, the upright rib plates 43 and the first connecting rib plates 41 are located between two adjacent annular rib plates 12, second connecting rib plates 42 perpendicular to the first upper support plate 13 are fixedly connected between the upright rib plates 43 and the annular rib plates 12, the second connecting rib plates 42 extend in the left-right direction, one end of each second connecting rib plate is fixedly connected with the upright rib plate 43, and the other end of each second connecting rib plate is fixedly connected with the annular rib plate 12. If the distance between the other annular rib plate 12 close to the other annular rib plate 12 on the other side of the annular rib plate 12 which is fixedly connected with the second connecting rib plate 42 is short, a plurality of second connecting rib plates 42 can be arranged between the two annular rib plates 12, so that the coverage area of the rib plate net on the first upper support plate 13 is further enlarged. In the process that the whole rib net composed of the vertical rib plates 43 and the first connecting rib plates 41 is lifted upwards, the left and right annular rib plates 12 can be pulled upwards through the second connecting rib plates 42, the outer edges of the annular rib plates 12 are completely attached and fixed to the inner wall of the outer beam frame body 1, so that the annular rib plates 12 can also play a role in pulling the whole outer beam frame body 1 upwards, and the collapse degree of the outer beam frame body 1 towards the front lower part is further reduced.

The precision adjusting bolts 3 on the first rear support plate 14 reduce the forward deformation of the outer beam frame 1, and the deformation degree is smaller than the downward collapse degree, so in this embodiment, two precision adjusting bolts 3 which have the same height and are located between two adjacent annular rib plates 12 are arranged in the middle of the first rear support plate 14 in the left-right direction, and usually the height positions of the two precision adjusting bolts 3 are located at the upper part of the first rear support plate 14, so that the precision adjusting bolts 3 can be combined with the four precision adjusting bolts 3 on the first upper support plate 13 to play a role of pulling the outer beam frame 1 upwards and backwards; the first rear supporting plate 14 is further fixed with two straight rib plates 44 perpendicular to the first rear supporting plate 14, the right end of the straight rib plate 44 is fixedly connected with the right annular rib plate 12, the left end of the straight rib plate 44 is fixedly connected with the left annular rib plate 12, the two straight rib plates 44 are respectively positioned above and below the precision adjusting bolt 3, thus the upper and lower straight rib plates 44 and the two annular rib plates 12 fixedly connected with the upper and lower straight rib plates 44 also form a rib plate network for enclosing the two precision adjusting bolts 3, when the two precision adjusting bolts 3 on the first rear supporting plate 14 support the first rear supporting plate 14 backwards, the parts covered by the network formed by the straight rib plates 44 and the annular rib plates 12 on the first rear supporting plate 14 can be pulled backwards together, and the supporting effect of the precision adjusting bolt 3 on the first rear supporting plate 14 is effectively improved, further reducing the collapse of the outer beam frame 1 forward and downward. In the present embodiment, the fixed connection between various rib plates and the outer beam frame 1 or the inner beam 2 is preferably welded.

In order to further improve the pulling effect of the annular rib plate 12 on the outer beam frame 1, in this embodiment, preferably, the annular rib plate 12 is a straight plate extending in the front-back direction, the outer edge of the annular rib plate 12 is completely attached and fixedly connected with the inner wall of the outer beam frame 1, so that the annular rib plate 12 supports the whole frame of the outer beam frame 1, and the pulling force applied to the outer beam frame 1 by the annular rib plate 12 at the upper rear part of the outer beam frame 1 is also in the front-back direction, so that the transmission effect of the annular rib plate 12 on the force is fully exerted, and the collapse of the outer beam frame 1 toward the front lower part is more effectively reduced. In this embodiment, it is preferable that the outer beam frame 1 is a square frame with a rectangular cross section, the cross section of the first cavity 11 is also rectangular, and the outer edge of the annular rib 12 is also rectangular, so as to satisfy the complete attachment and fixed connection between the outer edge of the annular rib 12 and the inner wall of the outer beam frame 1, and preferably, the outer beam frame is welded. The annular rib plates 12 are supported in the first inner cavity 11 of the outer cross beam frame body 1, a certain angle can exist in the left and right direction, any two adjacent annular rib plates 12 are preferably of V-shaped structures with the same angle, the two annular rib plates 12 forming the V-shaped structures can be in mutual contact or have intervals at included angles, local triangular stable structures can be formed, the supporting effect of the annular rib plates 12 on the outer cross beam frame body 1 is further improved, the angle between every two adjacent annular rib plates 12 is consistent, the supporting effect of the annular rib plates 12 on the outer cross beam frame body 1 is balanced, and weak links of the outer cross beam frame body 1 are avoided. The inner cross beam 2 penetrates through a central hole of the annular rib plate 12 and is erected on the annular rib plate 12, the annular rib plate 12 supports the inner cross beam 2 through a part of the inner edge, which is located below the inner cross beam 2, so that the inner edge of the annular rib plate 12 is preferably provided with a supporting edge 122 which extends in the front-back direction and is located below the inner cross beam 2, the lower surface of the inner cross beam 2 is in a flat laying shape, the inner cross beam 2 can be supported by the annular rib plates 12, and the inner cross beam 2 is horizontally laid on the annular rib plates 12 through the lower surface, so that the stability of the inner cross beam 2 in the first cavity 11 is ensured. The inner cross beam 2 can be fixed by being fixedly connected with the annular rib plate 12 or by being fixedly connected with the outer cross beam frame body 1, and when the inner cross beam 2 is fixed, a base plate can be arranged between the inner cross beam 2 and the annular rib plate 12 so as to be conveniently fixed by using bolts.

In this embodiment, the outer beam frame 1 is a frame structure formed by welding a plurality of plates, and the first cavity 11 is formed in the inner hollow portion of the outer beam frame 1, so that the weight of the outer beam frame 1 itself is reduced, and the collapse of the middle portion of the outer beam frame 1 toward the front lower side is reduced, and similarly, the weight of the inner beam 2 also needs to be reduced to reduce the collapse of the middle portion of the outer beam frame 1 toward the front lower side. In this embodiment, it is preferable that the second cavity 21 is provided inside the inner beam 2, so that the inner beam 2 is also a hollow frame structure inside, the weight of the inner beam is effectively reduced, and meanwhile, in order to ensure the structural strength of the inner beam 2, a plurality of second rib plates 22 arranged in the left-right direction are provided in the second cavity 21, the second rib plates 22 are flat plates extending in the front-back direction, the outer edges of the second rib plates 22 are completely attached to and fixedly connected with the inner wall of the inner beam 2, and the inner beam 2 is supported by the second rib plates 22 from inside, so that the strength of the inner beam 2 is improved, the deformation resistance of the inner beam 2 is improved, and the supporting effect of the inner beam 2 on the outer beam frame 1 is improved. Further improvement, preferably, two arbitrary adjacent second gusset 22 each other become the V font structure that the angle is unanimous, two second gusset 22 that constitute the V font structure can be mutually contact also can have the interval in contained angle department, can both form local triangle stable structure, further improve the supporting role of second gusset 22 to inner beam 2, and the angle that every two adjacent second gusset 22 pressed from both sides is unanimous, make second gusset 22 comparatively balanced to the supporting role that inner beam 2 played, avoid inner beam 2 weak link to appear.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A concealed machine tool beam structure with adjustable precision is characterized by comprising an outer beam frame body (1) and an inner beam (2) which extend along the left and right transverse directions, a first cavity (11) is formed inside the outer beam frame body (1), an annular rib plate (12) is arranged in the first cavity (11), the inner edge of the annular rib plate (12) is surrounded by a central hole (121), the outer edge is fixedly connected with the outer beam frame body (1), the annular rib plates (12) are arranged along the left-right direction, the inner cross beam (2) is positioned in the first cavity (11) and passes through the central hole (121) to be erected on the annular rib plates (12), the inner cross beam (2) is fixedly connected with the annular rib plate (12) or the outer cross beam frame body (1), the length of the inner cross beam (2) is more than half of that of the outer cross beam frame body (1); the outer beam frame body (1) comprises a first rear supporting plate (14) which is positioned behind the inner beam (2) and is vertical and a first upper supporting plate (13) which is positioned above the inner beam (2) and is tiled, the inner beam (2) comprises a rear supporting surface (24) which faces the rear and is upright and an upper supporting surface (23) which faces the upper and is flat, the first rear supporting plate (14) and the first upper supporting plate (13) are both provided with precision adjusting bolts (3) in a penetrating way, the precision adjusting bolt (3) can adjust the distance between the first rear support plate (14) and the rear support surface (24) and the distance between the first upper support plate (13) and the upper support surface (23), and the first rear supporting plate (14) and the first upper supporting plate (13) are provided with mounting holes for the precision adjusting bolts (3) to pass through.

2. A precision adjustable concealed machine tool beam structure according to claim 1, characterized in that the precision adjusting bolt (3) comprises a threaded rod (31) and an adjusting nut (32) screwed on the threaded rod (31), the threaded rod (31) passes through the outer beam frame (1) and one end of the threaded rod abuts against the inner beam (2), the adjusting nut (32) comprises a top pulling part (321), a moving part (322) and a rotating part (323) which are fixedly connected in sequence, the top pulling part (321) is located between the outer beam frame (1) and the inner beam (2) and has a cross-sectional area larger than the size of the mounting hole, the moving part (322) is inserted into the mounting hole and can move along the threaded rod (31), and the rotating part (323) is located outside the outer beam frame (1).

3. The concealed machine tool beam structure with adjustable precision according to claim 2, wherein four precision adjusting bolts (3) arranged in a shape like a Chinese character tian are arranged at the middle position of the first upper support plate (13) in the left-right direction, a plurality of vertical rib plates (43) and first connecting rib plates (41) perpendicular to the first upper support plate (13) are further fixed on the first upper support plate (13), the vertical rib plates (43) extend in the front-back direction, the front end and the rear end of each vertical rib plate are fixed on the inner wall of the outer cross beam frame body (1), the vertical rib plates (43) are arranged side by side in the left-right direction, the first connecting rib plates (41) are fixed between any two adjacent vertical rib plates (43), the first connecting rib plates (41) extend in the left-right direction, and the two ends of each vertical rib plate (43) are respectively and fixedly connected, each precision adjusting bolt (3) is surrounded by the front and the rear first connecting rib plates (41) and the left and the right vertical rib plates (43).

4. The concealed machine tool beam structure with adjustable precision according to claim 3, wherein the vertical rib plate (43) and the first connecting rib plate (41) are both located between two adjacent annular rib plates (12), a second connecting rib plate (42) perpendicular to the first upper support plate (13) is fixedly connected between the vertical rib plate (43) and the annular rib plate (12), the second connecting rib plate (42) extends in the left-right direction, one end of the second connecting rib plate is fixedly connected with the vertical rib plate (43), and the other end of the second connecting rib plate is fixedly connected with the annular rib plate (12).

5. The concealed machine tool beam structure with adjustable precision according to claim 4, characterized in that two precision adjusting bolts (3) which are consistent in height and located between two adjacent annular rib plates (12) are arranged in the middle of the first rear support plate (14) in the left-right direction, two straight rib plates (44) perpendicular to the first rear support plate (14) are further fixed on the first rear support plate (14), the right end of each straight rib plate (44) is fixedly connected with the right annular rib plate (12), the left end of each straight rib plate is fixedly connected with the left annular rib plate (12), and the two straight rib plates (44) are located above and below the precision adjusting bolts (3) respectively.

6. The concealed machine tool beam structure with adjustable precision according to claim 5, wherein the annular rib plate (12) is perpendicular to the first rear support plate (14), and the outer edge of the annular rib plate (12) is completely attached and fixedly connected with the inner wall of the outer beam frame body (1).

7. The concealed machine tool beam structure with adjustable precision according to claim 6, wherein any two adjacent annular rib plates (12) form a V-shaped structure with consistent angles with each other.

8. A concealed machine tool beam structure with adjustable accuracy according to claim 7, wherein the inner edge of the annular rib plate (12) has a support edge (122) extending in the front-back direction and located below the inner beam (2), and the lower surface of the inner beam (2) is flat.

9. The concealed machine tool beam structure with adjustable precision according to claim 8, wherein a second cavity (21) is arranged inside the inner beam (2), a plurality of second rib plates (22) which are arranged along the left-right direction are arranged in the second cavity (21), the second rib plates (22) are perpendicular to the rear supporting surface (24) and the outer edges of the second rib plates are completely attached to and fixedly connected with the inner wall of the inner beam (2).

10. The concealed machine tool beam structure with adjustable precision according to claim 9, wherein any two adjacent second rib plates (22) form a V-shaped structure with consistent angles with each other.

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