A crossbeam mechanism for a gantry type machining center

Abstract

The present invention discloses a crossbeam mechanism of a gantry type machining center, comprising a crossbeam box and a spindle assembly arranged in the crossbeam box, wherein a Y-axis guide pair is arranged on the top and bottom surfaces of the crossbeam box; the spindle assembly comprises an upper connecting plate and a lower connecting plate, an upper fixed plate and a lower fixed plate, a Y-axis feeding mechanism and a spindle box, wherein Z-axis guide pairs are arranged on both sides of the spindle box, a spindle motor, a coupling and a spindle are arranged in the spindle box, a Y-axis slider is arranged on the upper connecting plate and the lower connecting plate, and the upper fixed plate and the lower fixed plate are right-angle bent plates, one end of which fixes the Z-axis slider, and the other end is respectively fixed to the upper connecting plate and the lower connecting plate. Compared with the prior art, the crossbeam mechanism provided by the present invention directly connects the spindle assembly through the upper connecting plate and the lower connecting plate and the upper fixed plate and the lower fixed plate, thereby reducing the space occupied by the spindle box, having good structural processability, strong overall structural rigidity, and being suitable for modular design and mass production.

Description

Technical Field

[0001] The invention relates to the technical field of gantry type machining center equipment, and in particular to a crossbeam mechanism of a gantry type machining center. Background Art

[0002] In traditional gantry machining centers, the spindle box is arranged on the outer side of the crossbeam. In this structure, the crossbeam will bend and deform under the action of the gravity of the spindle box and the axial cutting force, which will cause the spindle box to tilt and destroy the static geometric accuracy of the machine tool.

[0003] To this end, Chinese utility model patent CN202606882U provides a double-column vertical machining center with a center-mounted spindle box structure, including a bed and a crossbeam placed thereon, on which a spindle is provided for assembling the spindle box, and the spindle and the crossbeam are connected by a center-mounted matching assembly. This application uses a center-mounted spindle box, in which the spindle box gravity and axial cutting resistance act on the center of the crossbeam, thereby reducing the bending of the crossbeam and improving the dynamic geometric accuracy of the machine tool. Due to the center-mounted arrangement of the spindle box and the spindle, the thermal deformation of the crossbeam is symmetrically distributed. The products processed by this utility model have increased flatness, parallelism and verticality accuracy of the workpiece. However, the center-mounted spindle box structure of the double-column vertical machining center provided by this utility model patent has the following disadvantages:

[0004] (1) The spindle box and the crossbeam are directly connected by a centrally mounted assembly. The cross-sectional size of the spindle box must be adapted to the cross-sectional size of the strip through hole in the center of the crossbeam. The cross-sectional size of the spindle box is large and the weight is large, which increases the production cost.

[0005] (2) The spindle is directly moved up and down in the Z-axis direction by controlling the lifting and lowering of the spindle. The spindle has low rigidity and is prone to shaking during the up and down movement, causing the tool trajectory connected to the lower end of the spindle to deviate, resulting in reduced precision of the workpiece being processed;

[0006] (3) The Y-axis guide rail is set on the outside of the beam, and a groove needs to be set on the side of the beam, which reduces the rigidity of the beam and causes the beam to bend.

[0007] In view of this, it is necessary to improve the crossbeam mechanism of the gantry machining center to reduce the space occupied by the crossbeam mechanism and the cost of the whole machine, and to enhance the rigidity and stability of the process system composed of the crossbeam and the spindle box. Summary of the invention

[0008] The technical problem to be solved by the present invention is that the headstock box of the beam mechanism of the existing gantry type machining center is heavy, occupies a large space and has a high cost of the whole machine, and the rigidity and stability of the process system composed of the beam and the headstock are poor.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0010] A crossbeam mechanism of a gantry type machining center comprises a crossbeam box and a spindle assembly arranged in the crossbeam box.

[0011] A set of Y-axis guide rail pairs are respectively provided on the top and bottom surfaces of the crossbeam box;

[0012] The spindle assembly comprises:

[0013] The upper connecting plate and the lower connecting plate are arranged opposite to each other and are in a ring shape, and a Y-axis slider is respectively arranged at four corners of the bottom surface of the upper connecting plate and the top surface of the lower connecting plate;

[0014] Four sets of upper fixing plates and lower fixing plates arranged opposite to each other, wherein the upper fixing plates and the lower fixing plates are right-angle bent plates, one end of which fixes the Z-axis slider, and the other end of which is respectively fixed to the upper connecting plate and the lower connecting plate;

[0015] The spindle box is a box-shaped frame structure, with a set of Z-axis guide rail pairs arranged on the left and right sides respectively. A spindle motor is arranged on the top surface of the spindle box, and a spindle and a coupling are arranged in the spindle box. The upper end of the spindle is connected to the lower end of the spindle motor through the coupling, and the spindle is driven to work by the spindle motor;

[0016] The Z-axis feeding mechanism is arranged on the upper connecting plate and the lower connecting plate and is fixed to the side surface of the spindle box, and is used for driving the spindle box to move up and down along the Z-axis guide rail pair.

[0017] The Y-axis feeding mechanism is vertically arranged with the spindle box, and is fixedly connected with the upper connecting plate and the lower connecting plate through the Y-axis nut seat to form a rigid frame, and is used to drive the spindle box to move left and right along the Y-axis guide pair.

[0018] In this solution, the crossbeam mechanism further includes columns, which are arranged at the left and right ends of the crossbeam box, the top surface of which is fixed to the bottom surface of the crossbeam box, and the bottom surface of which is provided with an X-axis slider; the inner side of the column is provided with a connecting ear and an oblique rib;

[0019] In this solution, the Z-axis feeding mechanism includes:

[0020] Z-axis feed motor, used to drive the Z-axis screw pair to rotate;

[0021] The Z-axis screw pair is a ball screw pair, comprising a Z-axis ball screw and a Z-axis ball nut, wherein the top end of the Z-axis screw pair is connected to the Z-axis feed motor through a coupling, and the bottom end thereof is arranged in a Z-axis bearing seat;

[0022] A Z-axis motor seat, the bottom surface of which is fixed to the top surface of the upper connecting plate, the Z-axis feed motor is fixed on the top surface of the Z-axis motor seat, and one end of the Z-axis lead screw pair is arranged in the Z-axis motor seat;

[0023] A Z-axis bearing seat is fixed to the bottom surface of the lower connecting plate; the Z-axis lead screw pair is connected to the Z-axis bearing seat through a bearing;

[0024] The top end of the Z-axis lead screw pair is bidirectionally positioned and supported by a locking nut, an angular contact ball bearing and a bearing cover with the Z-axis motor seat, and the bottom end thereof is simply supported by an angular contact ball bearing and the Z-axis bearing seat.

[0025] In this solution, the Z-axis ball nut is fixed to the side of the spindle box through a Z-axis nut seat.

[0026] In this solution, the Z-axis feed mechanism is provided with an elastic pad to limit the stroke of the Z-axis lead screw pair.

[0027] In this solution, the Y-axis feeding mechanism includes:

[0028] Y-axis feed motor, used to drive the Y-axis screw pair to rotate;

[0029] The Y-axis screw pair is a ball screw pair, comprising a Y-axis ball screw and a Y-axis ball nut; the top end of the Y-axis screw pair is connected to the Y-axis feed motor through a coupling, and the bottom end thereof is arranged in the Y-axis bearing seat;

[0030] A Y-axis motor seat is fixed on one end of the crossbeam box, the Y-axis feed motor is fixed on the top surface of the Y-axis motor seat, and one end of the Y-axis lead screw pair is arranged in the Y-axis motor seat;

[0031] A Y-axis bearing seat is fixed to the other end of the crossbeam box; the Y-axis lead screw pair is connected to the Y-axis bearing seat through a bearing;

[0032] The top end of the Y-axis lead screw pair is bidirectionally positioned and supported with the Y-axis motor seat through a locking nut, an angular contact ball bearing and a bearing cover, and the bottom end thereof is pre-stretched and supported with the Y-axis bearing seat.

[0033] In this solution, the Y-axis ball nut is arranged in the Y-axis nut seat, and the top surface and the bottom surface of the Y-axis nut seat are respectively fixed to the upper connecting plate and the lower connecting plate.

[0034] In this solution, a cover plate is provided on the side of the spindle box.

[0035] In this solution, a gasket is arranged on the inner side of the locking nut.

[0036] Compared with the prior art, the crossbeam mechanism provided by the present invention has a spindle box of a box-type frame structure. The spindle box components are connected to the crossbeam box through the upper connecting plate and the lower connecting plate and the roller guide rails arranged on the upper and lower surfaces of the crossbeam box. The cross section of the spindle box only needs to be adapted to the upper and lower connecting plates, thereby reducing the cross section size of the spindle box. The present invention directly connects the Y-axis slider and the Z-axis slider through the upper connecting plate and the lower connecting plate and the upper fixed plate and the lower fixed plate, thereby minimizing the spatial distance between the corresponding sliders and reducing the occupied space of the spindle box and the cost of the whole machine; the Y-axis feed mechanism is arranged vertically with the spindle box, and is fixedly connected to the upper connecting plate and the lower connecting plate through the Y-axis nut seat to form a rigid frame, thereby enhancing the rigidity and stability of the process system composed of the crossbeam and the spindle box. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a three-dimensional diagram of the crossbeam mechanism of the present invention;

[0038] Figure 2 It is a three-dimensional diagram of the spindle box in the present invention;

[0039] Figure 3 A three-dimensional diagram of the spindle box of the present invention from another angle;

[0040] Figure 4 is a three-dimensional diagram of the main shaft assembly of the present invention;

[0041] Figure 5 It is a three-dimensional diagram of the middle column of the present invention. DETAILED DESCRIPTION

[0042] The present invention provides a crossbeam mechanism for a gantry type machining center, which effectively solves the stability problem of the overall structure. The present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] like Figure 1 As shown, the crossbeam mechanism of the gantry type machining center provided by the present invention includes a crossbeam box 10 and a spindle assembly 20 arranged in the crossbeam box 10, and a column 30 is arranged on the bottom surface of the crossbeam box 10. A set of upper Y-axis guide rails 111 is arranged on the top surface of the crossbeam box 10, and a set of lower Y-axis guide rails is arranged on the bottom surface of the crossbeam box 10. Among them, the X-axis direction is the direction perpendicular to the front side and rear side of the crossbeam box, the Y-axis direction is the direction perpendicular to the left side and right side of the crossbeam box, and the Z-axis direction is the direction perpendicular to the top and bottom surfaces of the crossbeam box.

[0044] The spindle assembly 20 includes a spindle box 21 , a Z-axis feed mechanism 22 and a Y-axis feed mechanism 23 . The spindle assembly 20 is installed in the beam box 10 through an upper connecting plate 24 , a lower connecting plate 25 , four upper fixing plates 26 and four lower fixing plates 27 .

[0045] like Figure 2As shown, the upper connecting plate 24 and the lower connecting plate 25 are annular, arranged opposite to each other up and down, and sleeved on the spindle box 21. An upper Y-axis slider 240 is respectively arranged at the four corners of the bottom surface of the upper connecting plate 24, and the upper Y-axis slider 240 is adapted to the upper Y-axis guide rail 111, and a lower Y-axis slider 250 is respectively arranged at the four corners of the top surface of the lower connecting plate 25, and the lower Y-axis slider 250 is adapted to the lower Y-axis guide rail. The four upper Y-axis sliders 240 and the four lower Y-axis sliders 250 install the spindle assembly 20 on the crossbeam box 10, and enable the spindle assembly 20 to move left and right along the Y-axis direction under the drive of the Y-axis feed mechanism 23.

[0046] The upper fixing plate 26 and the lower fixing plate 27 are right-angled bent plates arranged opposite to each other, and include a fixing portion and a slider mounting portion perpendicular to each other. The fixing portion of the upper fixing plate 26 is fixed to the top surface of the upper connecting plate 24 by bolts, and the fixing portion of the lower fixing plate 27 is fixed to the bottom surface of the lower connecting plate 25 by bolts. The slider mounting portions of the upper fixing plate 26 and the lower fixing plate 27 are arranged on the inner side of the upper connecting plate 24 and the lower connecting plate 25, and are arranged opposite to the left and right sides of the spindle box 21, and a Z-axis slider 260 is fixed to each slider mounting portion.

[0047] The spindle box 21 is a box-shaped frame structure, and horizontal reinforcing ribs are arranged between the vertical sides. A set of Z-axis guide rails 210 are arranged on the left and right sides of the spindle box 21, respectively. The Z-axis guide rails 210 are adapted to the Z-axis slider 260. The Z-axis guide rails 210 connect the spindle box 21 to the upper fixed plate 26 and the lower fixed plate 27, and enable the spindle box 21 to move up and down along the Z-axis direction under the drive of the Z-axis feed mechanism 22. Figure 3 As shown, a spindle motor 211 is arranged on the top surface of the spindle box 21, a spindle 212 is arranged in the spindle box 21, the top end of the spindle 212 is connected to the spindle motor 211 through a coupling, the bottom end of the spindle 212 is connected to a processing tool, and the spindle motor 211 drives the spindle 212 to process the parts. A cover plate 213 is arranged on the side of the spindle box 21 for dust prevention.

[0048] like Figure 2 and Figure 3 As shown, the Z-axis feed mechanism 22 is parallel to the spindle box 21 and is arranged in the upper connecting plate 24 and the lower connecting plate 25. The Z-axis feed mechanism 22 includes a Z-axis screw pair 221 and a Z-axis feed motor 222 for driving the Z-axis screw pair 221 to rotate, a Z-axis motor seat 223 and a Z-axis bearing seat 224.

[0049] The Z-axis screw pair 221 is a ball screw pair, including a Z-axis ball screw and a Z-axis ball nut. The top of the Z-axis screw pair 221 is connected to the Z-axis feed motor 222 through a coupling. A locking nut, an angular contact ball bearing and a bearing gland are arranged at the top of the Z-axis screw pair 221. A gasket is arranged on the inner side of the locking nut. Through the locking nut, the angular contact ball bearing and the bearing gland, the Z-axis screw pair 221 and the Z-axis motor seat 223 are bidirectionally positioned and supported. An angular contact ball bearing is arranged at the bottom end of the Z-axis screw pair 221. Through the angular contact ball bearing, the Z-axis screw pair 221 and the Z-axis bearing seat 224 are simply supported. The Z-axis feed mechanism 22 is provided with an elastic pad to limit the stroke of the Z-axis screw pair 221.

[0050] The Z-axis motor seat 223 is arranged on the upper connecting plate 24, and its top surface is fixed to the Z-axis feed motor 222, which is fixed to the top surface of the upper connecting plate 24. The Z-axis lead screw pair 221 is arranged in the Z-axis motor seat 223, and the bottom end of the Z-axis lead screw pair 221 passes through the Z-axis motor seat 223.

[0051] The Z-axis bearing seat 224 is a square connecting plate, one end of which is fixed to the bottom surface of the lower connecting plate 25, and the other end is provided with a through hole, in which the Z-axis lead screw pair 221 is arranged, and is simply supported by an angular contact ball bearing and the Z-axis bearing seat 224.

[0052] The Z-axis screw pair 221 also includes a Z-axis nut seat 225, which is a right-angle bent plate, including a fixing portion and a nut mounting portion, the fixing portion is fixed to the side of the spindle box 21, the nut mounting portion is adapted to the Z-axis ball nut, the Z-axis ball nut is fixed in the nut mounting portion, and is fixed to the side of the spindle box 21 through the Z-axis nut seat 225. The Z-axis feed motor 222 drives the Z-axis screw pair 221 to rotate, so that the Z-axis ball nut moves up and down along the Z-axis ball screw, thereby driving the spindle box 21 to move up and down.

[0053] like Figure 1 and Figure 4 As shown, the Y-axis feeding mechanism 23 is parallel to the beam box 10 and is arranged in the beam box 10. The Y-axis feeding mechanism 23 includes a Y-axis screw pair 231 and a Y-axis feeding motor 232 for driving the Y-axis screw pair 231 to rotate, a Y-axis motor seat 233 and a Y-axis bearing seat 234.

[0054] The Y-axis screw pair 231 is a ball screw pair, including a Y-axis ball screw and a Y-axis ball nut. The top end of the Y-axis screw pair 231 is connected to the Y-axis feed motor 232 through a coupling. Locking nuts, angular contact ball bearings and bearing glands are arranged at both ends of the Y-axis screw pair 231. A gasket is arranged on the inner side of the locking nut. The top end of the Y-axis screw pair 231 is bidirectionally positioned and supported with the Y-axis motor seat 223, and the bottom end is pre-stretched and supported with the Y-axis bearing seat.

[0055] The Y-axis motor seat 233 is cylindrical, and a connecting piece is provided on the top surface thereof for fixing the Y-axis feed motor 231. The bottom surface of the Y-axis motor seat 233 is fixed to the left side surface of the beam box 21. The Y-axis bearing seat 234 is cylindrical, and is fixed to the right side surface of the beam box 21. The Y-axis lead screw pair 231 is inserted into the Y-axis bearing seat 234.

[0056] The Y-axis screw pair 231 also includes a Y-axis nut seat 235. The Y-axis nut seat 235 is a sheet-shaped bracket, which is arranged parallel to the side of the main shaft box 21. Its top and bottom surfaces are respectively fixed to the upper connecting plate 24 and the lower connecting plate 25 to form a rigid frame. The side of the Y-axis screw pair 231 protrudes outward to form a Y-axis nut mounting seat, and the Y-axis ball nut is fixed in the Y-axis nut mounting seat. The Y-axis feed motor 232 drives the Y-axis screw pair 231 to rotate, so that the Y-axis ball nut moves along the Y-axis ball screw, and drives the main shaft box 21 to move left and right along the Y-axis direction through the Y-axis nut seat 236.

[0057] like Figure 1 and Figure 5 As shown, the column 30 is symmetrically arranged at the left and right ends of the bottom surface of the beam box 10, and its top surface is fixed to the top surface of the beam box 10, and an X-axis slider 31 is arranged on its bottom surface. The upper end of the inner side of the column 30 extends inwardly with an ear plate 32, and an oblique rib 33 is arranged between the ear plate 32 and the main body of the column 30. The ear plate 32 can increase the contact area between the column 30 and the beam box 10, thereby improving the structural rigidity and stability of the beam mechanism. An X-axis feed mechanism and an X-axis guide rail are arranged on the top surface of the fuselage, and an X-axis feed mechanism mounting portion 34 is arranged on the bottom surface of the column 30 protruding downward. When the column 30 is installed on the fuselage of the machining center, the X-axis feed mechanism is fixed to the column 30 through the X-axis feed mechanism mounting portion 34, thereby driving the beam mechanism to move forward and backward along the X-axis.

[0058] The method of use (working process) of the present invention is as follows:

[0059] The crossbeam mechanism is installed on the column base of the gantry machining center body through the column 30, and the column base is provided with an X-axis guide rail and an X-axis feed mechanism. A processing tool is installed at the end of the spindle 212, and the parts to be processed are processed under the drive of the spindle motor 211. In the process of processing parts, the spindle box 21 can be driven by the X-axis feed mechanism installed on the column 30 to move forward and backward along the X-axis direction, and the X-axis slider 31 on the bottom surface of the column 30 slides forward and backward on the X-axis guide rail to ensure that the crossbeam mechanism moves stably in the X-axis direction; at the same time, the Y-axis feed mechanism 23 can drive the spindle box 21 to move left and right along the Y-axis guide rail, and the Z-axis feed mechanism 22 can drive the driving shaft 21 to move up and down along the Z-axis direction, and the Z-axis slider 260 slides along the Z-axis guide rail 210 to ensure that the crossbeam mechanism moves stably in the Z-axis direction.

[0060] Compared with the prior art, the crossbeam mechanism is assembled on the column base of the bed component of the gantry machining center through the column. The columns can be replaced on the bed of the gantry machining center with different column base heights, thereby realizing the processing of parts of different heights.

[0061] In the present application, the spindle box is arranged in the upper connecting plate and the lower connecting plate, and is connected to the crossbeam box through the upper connecting plate and the lower connecting plate and the upper fixed plate and the lower fixed plate. The cross-sectional size of the spindle box only needs to be adapted to the size of the upper connecting plate and the lower connecting plate, and does not need to be adapted to the strip through hole in the center of the crossbeam box. Therefore, the cross-sectional size of the spindle box can be reduced, thereby reducing the volume of the spindle box, reducing the weight of the spindle box, and reducing the load and production cost of the crossbeam box.

[0062] In the present application, the Y-axis slider and the Z-axis slider are directly connected by an upper connecting plate and a lower connecting member as well as an upper fixed plate and a lower fixed plate. An upper Y-axis slider is arranged on the bottom surface of the upper connecting member, and the Z-axis slider is fixed to the upper connecting member through an upper fixed plate. A lower Y-axis slider is arranged on the top surface of the lower connecting member, and the Z-axis slider is fixed to the lower connecting member through a lower fixed plate. The distances between the upper Y-axis slider and the Z-axis slider, and between the lower Y-axis slider and the Z-axis slider are small, which reduces the space occupied by the beam mechanism, improves the structural processability and overall rigidity of the beam mechanism, and is suitable for module design and mass production.

[0063] In the present application, the Z-axis feed mechanism is arranged parallel to the spindle box in the upper connecting plate and the lower connecting plate, and is connected to the spindle box through the Z-axis nut seat. The up and down movement of the spindle is realized by the up and down movement of the spindle box along the Z-axis direction. It has good structural stability, prevents the spindle from deviating from the processing trajectory during the movement, and can improve the accuracy of the processed parts.

[0064] In this application, the Y-axis feed mechanism is set in the crossbeam box and is set vertically with the spindle box. It is fixedly connected with the upper connecting piece and the lower connecting piece through the Y-axis nut seat to form a rigid frame. There is no need to set a slot on the side of the crossbeam box, which ensures the integrity of the side structure of the crossbeam box, improves the structural rigidity of the crossbeam box, and avoids bending of the crossbeam box. The rigidity and stability of the process system composed of the crossbeam and the spindle box are enhanced.

[0065] In the present application, both the Z-axis screw pair and the Y-axis screw pair are ball screw pairs. The ball screw rotates to drive the ball nut to move, causing the spindle box to move along the Z-axis and Y-axis, converting the rotary motion into linear motion. The friction loss is small and the transmission efficiency is high, thereby improving the control of the machining center over the spindle position and the machining accuracy of the workpiece.

[0066] The spindle box adopts a frame structure, and horizontal reinforcing ribs are arranged between the vertical sides of the spindle box, which improves the structural rigidity of the spindle box, reduces the overall weight of the spindle box, reduces the production cost, reduces the bearing pressure of the crossbeam box, and improves the flexibility of the crossbeam mechanism.

[0067] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention.

Claims

1. A crossbeam mechanism of a gantry type machining center, comprising a crossbeam box and a spindle assembly arranged in the crossbeam box, characterized in that: A set of Y-axis guide rail pairs are respectively provided on the top and bottom surfaces of the crossbeam box; The spindle assembly comprises: The upper connecting plate and the lower connecting plate are arranged opposite to each other and are in a ring shape. A Y-axis slider is arranged at the four corners of the bottom surface of the upper connecting plate and the top surface of the lower connecting plate, respectively, and is adapted to the Y-axis guide rail pair. Four sets of upper fixing plates and lower fixing plates are arranged opposite to each other. The upper fixing plates and the lower fixing plates are right-angle bent plates, one end of which is used to fix the Z-axis slider, and the other end is fixed to the upper connecting plate and the lower connecting plate respectively; The spindle box is a box-shaped frame structure, with a set of Z-axis guide rail pairs arranged on the left and right sides respectively. A spindle motor is arranged on the top surface of the spindle box, and a spindle and a coupling are arranged in the spindle box. The upper end of the spindle is connected to the lower end of the spindle motor through the coupling, and the spindle is driven to work by the spindle motor; A Z-axis feeding mechanism, which is arranged on the upper connecting plate and the lower connecting plate and is fixed to the side of the spindle box, and is used to drive the spindle box to move up and down along the Z-axis guide rail pair; A Y-axis feeding mechanism is arranged vertically with the spindle box, and is fixedly connected with the upper connecting plate and the lower connecting plate through a Y-axis nut seat to form a rigid frame, and is used to drive the spindle box to move left and right along the Y-axis guide rail pair; The Z-axis feeding mechanism comprises: Z-axis feed motor, used to drive the Z-axis screw pair to rotate; The Z-axis screw pair is a ball screw pair, comprising a Z-axis ball screw and a Z-axis ball nut, wherein the top end of the Z-axis screw pair is connected to the Z-axis feed motor through a coupling, and the bottom end thereof is arranged in a Z-axis bearing seat; A Z-axis motor seat, the bottom surface of which is fixed to the top surface of the upper connecting plate, the Z-axis feed motor is fixed on the top surface of the Z-axis motor seat, and one end of the Z-axis lead screw pair is arranged in the Z-axis motor seat; A Z-axis bearing seat is fixed to the bottom surface of the lower connecting plate; the Z-axis lead screw pair is connected to the Z-axis bearing seat through a bearing; The top end of the Z-axis lead screw pair is bidirectionally positioned and supported by the Z-axis motor seat through a locking nut, an angular contact ball bearing and a bearing gland, and the bottom end is simply supported by an angular contact ball bearing and the Z-axis bearing seat; The Y-axis feeding mechanism comprises: Y-axis feed motor, used to drive the Y-axis screw pair to rotate; The Y-axis screw pair is a ball screw pair, comprising a Y-axis ball screw and a Y-axis ball nut; the top end of the Y-axis screw pair is connected to the Y-axis feed motor through a coupling, and the bottom end thereof is arranged in the Y-axis bearing seat; A Y-axis motor seat is fixed on one end of the crossbeam box, the Y-axis feed motor is fixed on the top surface of the Y-axis motor seat, and one end of the Y-axis lead screw pair is arranged in the Y-axis motor seat; A Y-axis bearing seat is fixed to the other end of the crossbeam box; the Y-axis lead screw pair is connected to the Y-axis bearing seat through a bearing; The top end of the Y-axis lead screw pair is bidirectionally positioned and supported with the Y-axis motor seat through a locking nut, an angular contact ball bearing and a bearing cover, and the bottom end thereof is pre-stretched and supported with the Y-axis bearing seat.

2. The crossbeam mechanism according to claim 1, characterized in that: It also includes columns, which are arranged at the left and right ends of the beam box, the top surface of which is fixed to the bottom surface of the beam box, and the bottom surface of which is provided with an X-axis slider; the upper end of the inner side of the column is provided with an ear plate and an oblique rib.

3. The crossbeam mechanism according to claim 1, characterized in that: The Z-axis ball nut is fixed to the side surface of the spindle box through a Z-axis nut seat.

4. The crossbeam mechanism according to claim 1, characterized in that: The Z-axis feeding mechanism is provided with an elastic pad to limit the stroke of the Z-axis lead screw pair.

5. The crossbeam mechanism according to claim 1, characterized in that: The Y-axis ball nut is arranged in the Y-axis nut seat, and the top surface and the bottom surface of the Y-axis nut seat are respectively fixed to the upper connecting plate and the lower connecting plate.

6. The crossbeam mechanism according to claim 1, characterized in that: A cover plate is arranged on the side of the spindle box.

7. The crossbeam mechanism according to claim 1, characterized in that: A gasket is arranged on the inner side of the locking nut.

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