阅读说明：本技术 一种中置式主轴箱结构 (Central spindle box structure ) 是由 陈仁杰 于 2019-12-23 设计创作，主要内容包括：本发明公开了一种中置式主轴箱结构,包括轴组件和连接组件,轴组件包括主轴箱和Z轴进给组件,主轴箱的上端设有主轴电机,主轴箱的外侧设有对称的四组滚柱导轨副,各滚柱导轨副与Z轴竖直滑块适配；连接组件包括两个连接板、两组直角弯板和连接两个连接板的Y轴螺母座,Y轴螺母座的一侧设有固定Y轴丝杠螺母的第一安装孔。本发明,通过扁平的连接板和直角弯板,将Y轴横向导轨滑块与主轴箱上的Z轴竖直滑块连接起来,且空间距离最近,结构更紧凑；缩小了主轴箱和连接板所需的截面尺寸,从而增强连接板的刚度,提高连接组件稳定性,主轴箱整体重量明显降低,提高了主轴箱和横梁组成的工艺系统的刚性,适合模块化设计,批量生产,生产成本低。(The invention discloses a central spindle box structure, which comprises a shaft assembly and a connecting assembly, wherein the shaft assembly comprises a spindle box and a Z-axis feeding assembly, a spindle motor is arranged at the upper end of the spindle box, four symmetrical roller guide rail pairs are arranged on the outer side of the spindle box, and each roller guide rail pair is matched with a Z-axis vertical sliding block; the connecting assembly comprises two connecting plates, two groups of right-angle bent plates and a Y-axis nut seat for connecting the two connecting plates, and a first mounting hole for fixing a Y-axis lead screw nut is formed in one side of the Y-axis nut seat. According to the invention, the Y-axis transverse guide rail sliding block and the Z-axis vertical sliding block on the spindle box are connected through the flat connecting plate and the right-angle bent plate, the space distance is nearest, and the structure is more compact; the required cross sectional dimension of headstock and connecting plate has been reduced to the rigidity of reinforcing connecting plate improves coupling assembling stability, and the whole weight of headstock obviously reduces, has improved the rigidity of the process system that headstock and crossbeam are constituteed, is fit for the modularized design, batch production, low in production cost.)

1. A central spindle box structure is characterized by comprising:

the spindle assembly comprises a spindle box and a Z-axis feeding assembly arranged on one side of the spindle box, a spindle motor is arranged at the upper end of the spindle box, a first coupler and a spindle are arranged in the spindle box, the spindle motor drives the spindle to rotate through the first coupler, four symmetrical roller guide rail pairs are arranged on the outer side of the spindle box, and each roller guide rail pair is matched with a Z-axis vertical sliding block;

a connection assembly comprising;

the center of each connecting plate is provided with a shaft box hole for the spindle box to pass through, the outer side of each connecting plate is provided with a Y-axis transverse guide rail slide block matched with the Y-axis transverse roller guide rail pair, and the Z-axis feeding assembly is fixed on the connecting plate;

the four right-angle bent plates are fixed in the same axle box hole, and are respectively fixed with the connecting plate and the corresponding Z-axis vertical sliding block;

and one side of the Y-axis nut seat is provided with a first mounting hole for fixing a Y-axis lead screw nut.

2. The centrally-mounted headstock structure of claim 1, wherein the Z-axis feed assembly comprises: all parts, which are cited only after the preceding definition, are only cited later.

A Z-axis feed motor;

the motor base is fixed with the connecting plate above the motor base, and the Z-axis feeding motor is fixed on the top surface of the motor base;

the Z-axis screw assembly comprises a Z-axis screw pair and a Z-axis screw nut fixed below the Z-axis screw pair, and the upper end of the Z-axis screw pair is linked with the Z-axis feeding motor through a second coupler;

the Z-axis nut seat is fixed on the side surface of the spindle box and is provided with a second mounting hole for fixing the Z-axis lead screw nut;

the Z-axis bearing block is fixed with the bottom surface of the connecting plate below the Z-axis lead screw pair, a positioning column is arranged below the Z-axis lead screw pair, and the positioning column is rotatably arranged in the Z-axis bearing block through an angular contact ball bearing.

3. The central spindle box structure according to claim 2, wherein a U-shaped extension plate is disposed at the bottom of the motor base, two sides of the U-shaped extension plate are respectively fixed to the top surfaces of two adjacent right-angle bending plates, and the middle of the U-shaped extension plate is fixed to the outer frame of the connecting plate.

4. The central spindle box structure according to claim 1, wherein the connecting plate is a square frame structure, and has a plurality of hollowed-out fabrication holes, and further has:

the inner ring is provided with a Z-axis fixing position for fixing the right-angle bent plate bolt, the right-angle bent plate is respectively fixed on the top surface of the connecting plate above and the bottom surface of the connecting plate below, and one side of the inner ring is provided with a clearance groove for the Z-axis feeding assembly to pass through;

the outer ring is provided with a Y-axis fixing position fixed with a Y-axis transverse guide rail slider through a bolt, the Y-axis transverse guide rail slider is fixed on the upper portion of the bottom surface of the connecting plate and the top surface of the connecting plate below the Y-axis transverse guide rail slider respectively, four grooves are formed in the front face of the outer ring, positioning bosses are arranged on the outer side edges, corresponding to the grooves, of the reverse face of the outer ring, bolts penetrate through the grooves and the Y-axis transverse guide rail slider, the outer side of the Y-axis transverse guide rail slider is fixed with the positioning bosses, the positioning bosses are used for side positioning, the other two positioning bosses are used for tightening, and the grooves and the positioning bosses form the Y-axis.

5. The central spindle box structure according to claim 2, wherein a bearing hole is formed in the motor base, four rows of angular contact ball bearings arranged in a DBB combination manner are arranged in the bearing hole, and the Z-axis lead screw pair penetrates through the bearing hole and is rotatably arranged in the bearing hole through the angular contact ball bearings.

6. The centrally-mounted headstock structure according to claim 5, wherein there is provided between the second coupling and the bearing bore:

the locking nut is arranged at the bottom of the second coupling, the Z-axis lead screw pair penetrates through the locking nut, and the positioning pin penetrates through the locking nut and is fixed with the Z-axis lead screw pair;

and the outer side of the sealing sleeve is in clearance seal with the bearing cover, and the locking nut compresses the inner ring of the upper side angular contact ball bearing through the sealing sleeve.

7. The central spindle box structure according to claim 1, wherein the Y-axis nut seat is a hollow vertical plate-shaped structure, and is provided with:

the first fixing positions are arranged at the centers of the top and the bottom of the nut seat and are used for vertically inserting and fixing the upper connecting plate and the lower connecting plate through bolts;

and the second fixing positions are arranged at the two sides of the top and the bottom of the nut seat and are used for horizontally inserting and fixing the corresponding right-angle bent plate through bolts.

8. The central spindle box structure according to claim 1, wherein the spindle box is of a square structure, two groups of roller guide rail pairs are respectively arranged on two opposite side surfaces, and a plurality of reinforcing rib plates are arranged between every two adjacent four groups of roller guide rail pairs.

9. The centrally-mounted headstock structure according to claim 1 wherein resilient limit stops are provided at the upper and lower ends of one of said roller guide pairs.

10. The central spindle box structure according to claim 8, wherein through holes for cables, air pipes and water pipes to pass through are formed in the plurality of reinforcing rib plates, and the cables, the air pipes and the water pipes are arranged on the inner side of the spindle.

Technical Field

The invention relates to the technical field of machining, in particular to a central spindle box structure.

Background

The machining equipment is an important component of the manufacturing industry, and the machining mode is various. The gantry type machining center can realize various machining such as turning, milling, boring, grinding and drilling, can also realize movement in three directions according to requirements, and is suitable for various machining occasions.

The spindle box structure of the gantry type machining center is divided into a front-mounted type and a middle-mounted type according to the mounting position of the spindle box on a beam. The guide rail type of the main spindle box is divided into a hard rail type and a linear rail type, and the linear rail type mostly adopts a roller linear guide rail pair. In a central line rail type spindle box structure, a spindle motor direct connection structure is mostly adopted at present, and the motor is arranged in the spindle box. The main spindle box is arranged in a frame-shaped component consisting of an upper frame-type integral structural component and a lower frame-type integral structural component, and the main spindle box moves left and right on the cross beam guide rail along with the frame-shaped component. The slide block of the guide rail of the main spindle box is arranged on the frame-shaped component, and the main spindle box moves up and down in the frame-shaped component along the guide rail of the main spindle box. The gantry moving beam type vertical turning and milling composite machining center disclosed in the Chinese invention patent application CN106271627A adopts a gantry frame arrangement, a lathe bed on a foundation is arranged on a vertical column, a guide rail and a slide block are arranged on the vertical column and support a vertically crossed cross beam, and a Y-axis double drive for the cross beam is formed by a motor and a lead screw; the saddle belt main shaft box moves on the left and right X axes of the beam, the main shaft box is also connected with the vertical guide rail, and the slide block, the saddle and the main shaft box drive the screw rod to move up and down on the Z axis under the running state of the motor; the spindle driving unit is arranged in the spindle box in an inverted mode, the bamboo hat type tool magazine is fixed to the rear side of the lathe body, the spindle power unit can achieve the function of taking the tool through X, Y, Z three shafts of the spindle, and the milling or turning function is achieved according to different types of the lathe. Such a structure causes the following drawbacks:

(1) an upper frame type integral structural member and a lower frame type integral structural member are adopted between the spindle box and the beam, the frame structure has large cantilever and poor rigidity, the form and position errors on each connecting surface are difficult to control, the structure is complex, and the assembly manufacturability is poor;

(2) the spindle motor is arranged in the spindle box, so that the appearance section of the spindle box is enlarged, the rigidity is poor, the processing manufacturability and the assembly manufacturability are poor, and the mass production is difficult to organize;

(3) the spindle box has a large section and heavy weight, so that a process system formed by the spindle box component and the beam component has poor rigidity, large occupied space and high cost of the whole machine;

(4) the consistency of processing and assembling of the spindle box and the frame-shaped component is poor, and the mass production is difficult to organize.

In view of this, there is a need for an improved central spindle box structure for facilitating machining and assembly and improving structural rigidity and stability.

Disclosure of Invention

The invention aims to solve the technical problems that the existing central spindle box structure is difficult to machine and assemble and has poor structural rigidity and stability.

In order to solve the above technical problem, the technical solution adopted by the present invention is to provide a central spindle box structure, including:

the spindle assembly comprises a spindle box and a Z-axis feeding assembly arranged on one side of the spindle box, a spindle motor is arranged at the upper end of the spindle box, a first coupler and a spindle are arranged in the spindle box, the spindle motor drives the spindle to rotate through the first coupler, four symmetrical roller guide rail pairs are arranged on the outer side of the spindle box, and each roller guide rail pair is matched with a Z-axis vertical sliding block;

a connection assembly comprising;

the center of each connecting plate is provided with a shaft box hole for the spindle box to pass through, the outer side of each connecting plate is provided with a Y-axis transverse guide rail slide block matched with the Y-axis transverse roller guide rail pair, and the Z-axis feeding assembly is fixed on the connecting plate;

the four right-angle bent plates are fixed in the same axle box hole, and are respectively fixed with the connecting plate and the corresponding Z-axis vertical sliding block;

and one side of the Y-axis nut seat is provided with a first mounting hole for fixing a Y-axis lead screw nut.

In another preferred embodiment, the Z-axis feed assembly comprises:

the motor base is fixed with the connecting plate above the motor base, and the Z-axis feeding motor is fixed on the top surface of the motor base;

the Z-axis screw assembly comprises a Z-axis screw pair and a Z-axis screw nut fixed below the Z-axis screw pair, and the upper end of the Z-axis screw pair is linked with the Z-axis feeding motor through a second coupler;

the Z-axis nut seat is fixed on the side surface of the spindle box and is provided with a second mounting hole for fixing the Z-axis lead screw nut;

the Z-axis bearing block is fixed with the connecting plate below the Z-axis lead screw pair, a positioning column is arranged below the Z-axis lead screw pair, and the positioning column is rotatably arranged in the Z-axis bearing block through an angular contact ball bearing.

In another preferred embodiment, the bottom of the motor base is provided with a U-shaped extension plate, two sides of the U-shaped extension plate are respectively fixed with the top surfaces of two adjacent right-angle bent plates, and the middle part of the U-shaped extension plate is fixed with the outer frame of the connecting plate.

In another preferred embodiment, the connecting plate is of a square frame structure, and is provided with a plurality of hollowed-out fabrication holes, and further provided with:

the inner ring is provided with a Z-axis fixing position for fixing the right-angle bent plate bolt, and one side of the inner ring is provided with a clearance groove for the Z-axis feeding assembly to penetrate through;

the front of the outer ring is provided with a groove, the back of the outer ring is provided with a positioning boss corresponding to the outer edge of the groove, a bolt penetrates through the groove and the Y-axis transverse guide rail sliding block, the outer side of the Y-axis transverse guide rail sliding block is fixed with the positioning boss, and the groove and the positioning boss form a Y-axis fixing position.

In another preferred embodiment, a bearing hole is formed in the motor base, a plurality of angular contact ball bearings are arranged in the bearing hole side by side, and the Z-axis lead screw pair is rotatably arranged in the bearing hole through the angular contact ball bearings.

In another preferred embodiment, there is provided between the second coupling and the bearing hole:

the locking nut is arranged at the bottom of the second coupling, the Z-axis lead screw pair penetrates through the locking nut, and the positioning pin penetrates through the locking nut and is fixed with the Z-axis lead screw pair;

the sealing sleeve is fixed with the top surface of the bearing hole, and the locking nut is rotatably arranged in the sealing sleeve.

In another preferred embodiment, the Y-axis nut seat is a hollow vertical plate-shaped structure, and is provided with:

the first fixing positions are arranged at the centers of the top and the bottom of the nut seat and used for being vertically inserted and fixed with the two connecting plates through bolts;

and the second fixing positions are arranged at the two sides of the top and the bottom of the nut seat and are used for horizontally inserting and fixing the corresponding right-angle bent plate through bolts.

In another preferred embodiment, the spindle box is of a square structure, two groups of roller guide rail pairs are respectively arranged on two opposite side surfaces, and a plurality of reinforcing rib plates are arranged between every two adjacent four groups of roller guide rail pairs.

In another preferred embodiment, the upper end and the lower end of one of the roller guide rail pairs are provided with elastic limit stoppers.

In another preferred embodiment, through holes for cables, air pipes and water pipes to pass through are formed in a plurality of reinforcing rib plates, and the cables, the air pipes and the water pipes are arranged on the inner side of the main shaft.

Compared with the prior art, the invention has the following advantages:

1. the Y-axis transverse guide rail sliding block is directly connected with the Z-axis vertical sliding block on the spindle box through the flat connecting plate and the right-angle bent plate, the space distance is the shortest, the occupied space is smaller, the structure is more compact, the structural manufacturability is good, and the integral rigidity is high; the required cross-sectional dimension of headstock and connecting plate is reduced to there is more design spaces and strengthens the rigidity of headstock, connecting plate and the crossbeam that matches, improves coupling assembling's stability.

2. The spindle motor is arranged at the top end of the spindle box and connected with the spindle through the first coupler, and the vertical moving distance of the spindle box is limited by the Z-axis feeding assembly outside the spindle box, so that the spindle motor is prevented from influencing the size of a spindle box hole, the cross-sectional sizes of the spindle box, the spindle box hole and the connecting plate can be further reduced, the rigidity of the connecting plate is enhanced, the stability of the connecting assembly is improved, in addition, the whole weight of the spindle box is obviously reduced, and the rigidity of a process system formed by the spindle box and a beam is improved.

3. Two connecting plates slide respectively and set up on the top surface and the bottom surface of crossbeam, and are more symmetrical with the hookup location of crossbeam, and two connecting plates have adopted Y axle nut seat to consolidate in addition and have formed a whole rigid frame, have effectively improved the stability between two connecting plates, make Y axle feed screw nut drive Y axle nut seat, connecting plate and headstock whole carry out the Y axle and remove simultaneously.

4. Four sets of roller guide rail pairs which are symmetrically arranged are adopted to realize a double-track structure, so that the gravity balance of the spindle box can be effectively ensured, and the stability of vertical movement and the processing process is improved.

5. The structure of connecting plate and headstock can carry out batch abrasive machining, and machining precision and assembly precision are easy to control, are particularly suitable for the modularized design, batch production, and product quality is stable, and manufacturing cost is lower.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic illustration of the present invention in broken away form;

FIG. 3 is a schematic structural view of two connecting plates according to the present invention;

FIG. 4 is a schematic structural view of a Y-axis nut socket according to the present invention;

FIG. 5 is a schematic view of the upper half of the axle assembly of the present invention;

FIG. 6 is a schematic view of the lower half of the axle assembly of the present invention;

FIG. 7 is a schematic view of the Z-axis feed assembly of the present invention;

FIG. 8 is a schematic view of the Z-axis feed assembly of the present invention in a disassembled configuration;

FIG. 9 is a schematic illustration of the spindle head of the present invention in disassembled form;

FIG. 10 is a schematic view of the present invention positioned on a beam of a gantry machining center.

Detailed Description

The invention provides a central spindle box structure, and the invention is described in detail below with reference to the drawings and the detailed description of the specification.

As shown in fig. 1 and 10, the central headstock structure 100 provided by the invention comprises a shaft assembly and a connecting assembly, wherein the connecting assembly is used for placing the shaft assembly on a beam 200 of a gantry machining center, and the shaft assembly can move along the beam 200 in a Y-axis manner and simultaneously provides support for a Z-axis feeding assembly 20 and can also move vertically under the action of the Z-axis feeding assembly 20.

As shown in fig. 7, the shaft assembly includes a main spindle box 10 and a Z-axis feeding assembly 20 disposed on one side of the main spindle box 10, a spindle motor 11 is disposed at the upper end of the main spindle box 10, a first coupler 111 and a spindle 112 are disposed inside the main spindle box 10, the spindle motor 11 drives the spindle 112 to rotate through the first coupler 111, four symmetrical roller guide rail pairs 12 are disposed outside the main spindle box 10, and each roller guide rail pair 12 is adapted to a Z-axis vertical slider 121. The main shaft 112 is arranged in a main shaft 112 hole of the main shaft box 10 and is fastened by screws, and the main shaft is provided with a knife striking cylinder and a central water outlet structure.

As shown in fig. 1 to 4, the connecting assembly includes two connecting plates 31, two sets of right-angle bending plates 32, and a Y-axis nut seat 33 connecting the two connecting plates 31. Wherein:

as shown in fig. 3, a pedestal hole 311 through which the spindle head 10 passes is formed at the center of each connecting plate 31, Y-axis cross rail sliders 317 for fitting with the Y-axis cross roller rail pairs are formed outside the connecting plates 31, and the Z-axis feed unit 20 is fixed to the connecting plates 31. The connecting plate 31 provides a space for the vertical movement of the spindle box 10, and the spindle box 10 is driven by the Z-axis feeding assembly 20 to move up and down in the spindle box hole 311, so that the power loss is low, and the working efficiency is efficient and accurate.

As shown in fig. 5 and 6, four right-angle bending plates 32 are fixed in the same axle box hole 311, and each right-angle bending plate 32 is fixed to the connecting plate 31 and the corresponding Z-axis vertical slider 121. The two groups of right-angle bent plates 32 are respectively arranged on the two connecting plates 31, the right-angle bent plates 32 are respectively arranged at different positions of the axle box hole 311, and are staggered with the connecting plates 31 and the corresponding Z-axis vertical slide blocks 121 in space.

As shown in fig. 4, the Y-axis nut holder 33 fixes the upper and lower connecting plates 31, and has a first mounting hole 330 for fixing the Y-axis screw nut 333 at one side thereof. The Y-axis lead screw transmission enables the Y-axis nut seat 33 to drive the two connecting plates 31 and the spindle box 10 to realize Y-axis transverse movement. In this embodiment, an opening is formed at one side of the first mounting hole 330, so that the assembly efficiency is improved.

As shown in fig. 7 and 8, in a preferred embodiment, the Z-axis feed assembly 20 includes a Z-axis feed motor 210, a motor mount 21, a Z-axis lead screw assembly, a Z-axis nut mount 23, and a Z-axis bearing mount 24. Wherein:

the motor base 21 is fixed with the connecting plate 31 above, the Z-axis feeding motor 210 is fixed on the top surface of the motor base 21, and the upper end of the Z-axis lead screw pair 22 is linked with the Z-axis feeding motor 210 through a second coupler 211;

the Z-axis lead screw assembly comprises a Z-axis lead screw pair 22 and a Z-axis lead screw nut 221 fixed below the Z-axis lead screw pair 22, and the upper end of the Z-axis lead screw pair 22 is linked with a Z-axis feeding motor 210 through a second coupling 211;

a Z-axis nut block 23 fixed to a side surface of the main spindle box 10 and provided with a second mounting hole for fixing the Z-axis feed screw nut 221;

the Z-axis bearing seat 24 is fixed with the connecting plate 31 below, a positioning column 222 is arranged below the Z-axis lead screw pair 22, and the positioning column 222 is rotatably arranged in the Z-axis bearing seat 24 through an angular contact ball bearing.

In this embodiment, the Z-axis lead screw pair 22 is driven by the Z-axis feed motor 210 to rotate, and the Z-axis nut seat 23 is fixed to the spindle box 10, so that the Z-axis nut seat 23 drives the spindle box 10 to vertically slide. Z axle screw pair 22's length is longer, and the upper end realizes the location through motor cabinet 21, second shaft coupling 211, and Z axle bearing frame 24 is fixed with connecting plate 31, provides the location effect for Z axle screw pair 22's bottom. The upper end of the Z-axis lead screw pair 22 is positioned in two directions, and the rear end is simply supported, so that a good transmission effect is guaranteed, the stability of a transmission process is also guaranteed, and a ball screw structure can be adopted.

Further, the bottom of the motor base 21 is provided with a U-shaped extension plate 213, two sides of the U-shaped extension plate 213 are respectively fixed with the top surfaces of two adjacent right-angle bent plates 32, and the middle part is fixed with the outer frame of the connecting plate 31. Motor cabinet 21 is fixed respectively with right angle bent 32 and connecting plate 31, and two liang of fixes between the three part, have effectively improved motor cabinet 21's stability, can reduce Z axle feed motor 210's vibrations.

Or, further, a bearing hole 212 is provided in the motor base 21, an angular contact ball bearing in a four-row DBB combined configuration is provided in the bearing hole 212, and the Z-axis screw pair 22 passes through the bearing hole 212 and is rotatably provided in the bearing hole 212 by the angular contact ball bearing. In this embodiment, motor cabinet 21 not only provides the mounted position for Z axle feed motor 210, still provides the dead eye 212 that plays location and direction function for Z axle lead screw is vice 22, effectively guarantees Z axle lead screw pair 22 pivoted stability in the course of working, further improves headstock 10 vertical movement's smoothness.

Or, further, a lock nut 222 and a gland 223 are provided between the second coupling 211 and the bearing hole 212. Wherein:

the locking nut 222 is arranged at the bottom of the second coupling 211, the Z-axis lead screw pair 22 penetrates through the locking nut 222, and the positioning pin penetrates through the locking nut 222 and is fixed with the Z-axis lead screw pair 22;

and the outer side of the sealing sleeve 223 is in clearance sealing with the bearing cover, and the locking nut 222 presses the inner ring of the upper angular contact ball bearing through the sealing sleeve 223.

In this embodiment, the gland 223 engages the lock nut 222 to define the position of the second coupling 211 and prevent play between the second coupling 211 and the Z-axis lead screw pair 22.

In another preferred embodiment, as shown in fig. 3, the connecting plate 31 is a square frame structure, and has a plurality of hollowed-out fabrication holes, and further has an inner ring 312 and an outer ring 313. In this embodiment, the related components in the Z axis and the Y axis in different directions are connected without interfering with each other. Wherein:

an inner ring 312 provided with a Z-axis fixing position for fixing the right-angle bending plate 32 by bolts, wherein the right-angle bending plate 32 is respectively fixed on the top surface of the upper connecting plate 31 and the bottom surface of the lower connecting plate 31, and one side of the inner ring 312 is provided with a clearance groove 316 for the Z-axis feeding assembly 20 to pass through; the inner ring 312 is used for matching the right-angle bending plate 32 and the Z-axis vertical slide block 121 to generate a sliding connection relationship with the main spindle box 10.

The outer ring 313 is provided with Y-axis fixing positions which are fixed with Y-axis transverse guide rail sliders 317 through bolts, the Y-axis transverse guide rail sliders are respectively fixed to the bottom surface of the upper connecting plate 31 and the top surface of the lower connecting plate 31, four grooves 314 are formed in the front surface of the outer ring 313, positioning bosses 315 are arranged on the outer side edges, corresponding to the grooves 314, of the reverse surface, bolts penetrate through the grooves 314 and the Y-axis transverse guide rail sliders 317, the outer sides of the Y-axis transverse guide rail sliders 317 are fixed with the positioning bosses 315, two of the positioning bosses 315 are used for side positioning, the other two positioning bosses are used for clamping, and the grooves 314 and the positioning bosses 315 form. The outer ring 313 is used for realizing sliding fit connection between the Y-axis transverse guide rail sliding block 317 and the cross beam 200, and realizing movement in the Y-axis direction.

In another preferred embodiment, as shown in fig. 4, the Y-axis nut seat 33 is a hollow vertical plate-shaped structure, and has a first fixing location 331 and a second fixing location 332, wherein:

the first fixing positions 331 are arranged at the top and bottom centers of the nut seat and are used for vertically inserting and fixing the upper connecting plate 31 and the lower connecting plate 31 through bolts;

and second fixing locations 332, which are provided at both sides of the top and bottom of the nut seat, for horizontally inserting and fixing the corresponding right-angle bent plate 32 through bolts.

In this embodiment, the Y-axis nut seat 33 is not only fixed to the two connecting plates 31, but also fixed to two pairs of upper and lower right-angle bent plates 32, and is fixed by multiple points, so that the firmness is further improved.

In another preferred embodiment, as shown in fig. 1 and 9, the main spindle box 10 is of a square structure, two sets of roller guide rail pairs 12 are respectively arranged on two opposite side surfaces, and a plurality of reinforcing rib plates are arranged between every two adjacent four sets of roller guide rail pairs 12. Because the roller guide rail pairs 12 are arranged in a protruding mode, the reinforcing rib plates 13 can improve the rigidity between the two roller guide rail pairs 12.

Furthermore, through holes for cables, air pipes and water pipes to penetrate through are formed in the reinforcing rib plates 13, the cables, the air pipes and the water pipes are arranged on the inner side of the main shaft 111 and used for electric connection, the air pipes are used for air sealing, knife striking and knife blowing, and the water pipes are used for cooling the workpiece and the cutters in time, so that high temperature caused by overlarge force is reduced, and the processing quality of the workpiece is guaranteed.

In another preferred embodiment, as shown in fig. 5, resilient limit stops 122 are provided at the upper and lower ends of one of the roller guide pairs 12. Wherein Z axle feed subassembly 20 drive headstock 10 vertical migration, and elasticity limit stop 122 is used for when the lathe is debugged, in case the maloperation appears, avoids bumping between the part, and the protection equipment safety.

In the invention, the fixing modes can be fixed by adopting screws and reinforced by using conical positioning pins.

The invention has the following advantages:

1. the Y-axis transverse guide rail sliding block is directly connected with the Z-axis vertical sliding block on the spindle box through the flat connecting plate and the right-angle bent plate, the space distance is the shortest, the occupied space is smaller, the structure is more compact, the structural manufacturability is good, and the integral rigidity is high; the required cross-sectional dimension of headstock and connecting plate is reduced to there is more design spaces and strengthens the rigidity of headstock, connecting plate and the crossbeam that matches, improves coupling assembling's stability.

2. The spindle motor is arranged at the top end of the spindle box and is connected with the spindle by the aid of the first coupler, and the vertical moving distance of the spindle box is limited by the Z-axis feeding assembly outside the spindle box, so that the spindle motor is prevented from affecting the size of a spindle box hole, the cross-sectional sizes of the spindle box, the spindle box hole and the connecting plate can be further reduced, the rigidity of the connecting plate is enhanced, the stability of the connecting assembly is improved, the overall weight of the spindle box is obviously reduced, and the rigidity of a process system formed by the spindle box and a beam is improved.

3. Two connecting plates slide respectively and set up on the top surface and the bottom surface of crossbeam, and are more symmetrical with the hookup location of crossbeam, and two connecting plates have adopted Y axle nut seat to consolidate in addition and have formed a whole rigid frame, have effectively improved the stability between two connecting plates, make Y axle feed screw nut drive Y axle nut seat, connecting plate and headstock whole carry out the Y axle and remove simultaneously.

4. Four sets of roller guide rail pairs which are symmetrically arranged are adopted to realize a double-track structure, so that the gravity balance of the spindle box can be effectively ensured, and the stability of vertical movement and the processing process is improved.

5. The structure of connecting plate and headstock can carry out batch abrasive machining, and machining precision and assembly precision are easy to control, are particularly suitable for the modularized design, batch production, and product quality is stable, and manufacturing cost is lower.

The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.