Large-stroke lathe bed structure

Abstract

The invention relates to a large-stroke lathe bed structure which comprises a workbench, movable columns, a first cross beam, a second cross beam, a first moving mechanism and a second moving mechanism, first guide rails are arranged on the two sides of the workbench, the movable columns are arranged on the first guide rails, and the two movable columns are fixedly connected through the first cross beam; the first moving mechanism is used for driving the movable column to move along the first guide rail through a gear and a rack, a second guide rail is arranged on the top of the movable column, the second cross beam is arranged on the second guide rail, and the second moving mechanism is used for driving the second cross beam to move along the second guide rail through a lead screw and a nut. The first guide rail and the second guide rail are parallel to each other. The movable column and the movable beam are combined, the movable column is driven by the gear and the rack, and the second cross beam is driven by the lead screw nut, so that the machining center adopting the movable column can meet the large-stroke requirement and can also meet the high-precision machining requirement within a certain range.

Description

Technical Field

[0001] This invention relates to the field of gantry machining center technology, specifically to a large-stroke bed structure. Background Technology

[0002] For long-stroke gantry machining centers, the large stroke results in significant inertia from moving the worktable and the workpiece, making the movable worktable design unsuitable for such applications. Existing long-stroke gantry machining centers typically use a moving column or beam (i.e., the column or beam is movable). The worktable is fixed to the foundation, while the column or beam is mounted on guide rails. Gears and racks drive the column or beam to move, thus machining the workpiece on the worktable. However, gear and rack systems involve intermittent tooth meshing, resulting in a lower upper limit for precision, which in turn limits the precision of the machined workpiece. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a large-stroke bed structure to address the above-mentioned shortcomings.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: A long-stroke bed structure includes a worktable, a moving column, a first crossbeam, a second crossbeam, a first moving mechanism, and a second moving mechanism. First guide rails are provided on both sides of the worktable. The moving column is mounted on the first guide rails, and the two moving columns are fixedly connected by the first crossbeams. The first moving mechanism drives the moving column to move along the first guide rails via gears and racks. A second guide rail is provided on the top of the moving column. The second crossbeam is mounted on the second guide rails. The second moving mechanism drives the second crossbeam to move along the second guide rails via a lead screw and nut. The first and second guide rails are parallel to each other.

[0005] Furthermore, the moving column is composed of a first box girder, a second box girder, and a box column. The second box girder is located above the first box girder. The first box girder and the second box girder are fixedly connected by two box columns, and the two box columns are arranged at both ends of the first box girder and the second box girder. There are two first crossbeams, and the two first crossbeams are fixedly connected to the two ends of the two second box beams respectively.

[0006] Furthermore, it also includes a first base and a second base, with a second base provided on both sides of the first base, the worktable being disposed on the first base, and the first guide rail being disposed on the second base.

[0007] Furthermore, the first moving mechanism includes a rack, a gear, and a first driving unit. The rack is disposed on the second base and is parallel to the first guide rail. The gear is rotatably disposed on the moving column. The first driving unit is disposed on the moving column and its output end is connected to the gear. The gear and the rack mesh with each other.

[0008] Furthermore, a first fixed seat is provided on the moving column, and the first driving unit is fixed to the first fixed seat by screws. The first fixed seat is provided with trapezoidal grooves on both sides of the first driving unit, and trapezoidal blocks are fixed in the trapezoidal grooves by screws. The trapezoidal blocks abut against the first driving unit.

[0009] Furthermore, the second moving mechanism includes a lead screw, a nut, and a second drive unit. The lead screw is rotatably mounted on the top of the moving column and is parallel to the second guide rail. The second drive unit is mounted on the top of the moving column and its output end is connected to the lead screw. The nut is mounted on the bottom of the second crossbeam and cooperates with the lead screw.

[0010] Furthermore, a stopping mechanism is provided on the moving column, the stopping mechanism including a brake caliper and a hydraulic cylinder, a friction strip is provided on the second base, the friction strip is parallel to the first guide rail, the brake caliper is provided on the moving column, the friction strip is located in the jaws of the brake caliper, the hydraulic cylinder is provided on the moving column, the hydraulic cylinder can drive the brake caliper to close so that the brake caliper abuts against the friction strip, and the brake caliper can open when the hydraulic cylinder resets.

[0011] Furthermore, the brake caliper includes a second fixed seat, a caliper body, and a spring. The second fixed seat is disposed on the moving column, and two opposing caliper bodies are hinged to the second fixed seat. Friction pads are disposed at the bottom of the caliper bodies. The spring is disposed on the second fixed seat and is used to provide an elastic force that moves the bottoms of the two caliper bodies away from each other. The output end of the hydraulic cylinder is provided with a conical block. The hydraulic cylinder can drive the conical block to move towards the clamp body and push the tops of the two clamp bodies away from each other so that the bottoms of the two clamp bodies move closer to each other.

[0012] Furthermore, the top of the clamp body is hinged with several guide wheels, and the two sides of the conical block are provided with guide grooves that cooperate with the guide wheels.

[0013] Furthermore, the clamp body includes a lever arm and a mounting plate. The number of lever arms is at least three. The bottom of each lever arm is fixedly connected to the mounting plate. Friction plates are detachably provided on the mounting plate. A first shaft is provided in the middle of each lever arm. The lever arm is hinged to a second fixed seat through the first shaft. A second shaft is provided at the top of each lever arm. The guide wheel is hinged to the second shaft.

[0014] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages: This application combines a moving column and a moving beam. The moving column is driven by gears and racks, while the second crossbeam is driven by a lead screw and nut. This allows the machining center using this application to meet both the large stroke requirement and the high-precision machining requirement within a certain range. The moving column of this application is provided with a stopping mechanism. The stopping mechanism is hydraulically driven to move the conical block toward the clamp body so that the bottoms of the two clamp bodies come closer to each other, thereby clamping the friction strip, so that the moving column stops and can resist the reaction force when the second crossbeam moves or is processed.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present application; Figure 2 for Figure 1 Enlarged view of point A; Figure 3 This is a three-dimensional structural diagram of the brake caliper; Figure 4 This is a three-dimensional structural diagram from another perspective of this application; Figure 5 for Figure 4 Enlarged view of point B; Figure 6 This is a partial sectional view of this application.

[0017] The attached diagram lists the components represented by each number as follows: 1. Workbench; 2. Moving column; 21. First box girder; 22. Second box girder; 23. Box column; 3. First crossbeam; 4. Second crossbeam; 5. First moving mechanism; 51. Rack; 52. Gear; 53. First drive unit; 54. First fixed seat; 541. Trapezoidal groove; 55. Trapezoidal block; 6. Second moving mechanism; 61. Lead screw; 62. Nut; 63. Second drive unit; 71. First guide rail; 72. Second guide rail; 81. First base; 82. Second base; 821. Friction strip; 9. Stopping mechanism; 91. Brake caliper; 911. Second fixed seat; 912. Clamp body; 9121. Lever arm; 9122. Mounting plate; 9123. First shaft; 9124. Second shaft; 913. Spring; 914. Friction plate; 915. Guide wheel; 92. Hydraulic cylinder; 93. Conical block; 931. Guide groove. Detailed Implementation

[0018] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise" and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] like Figure 1 and Figure 4 As shown, a long-stroke bed structure includes a worktable 1, a moving column 2, a first crossbeam 3, a second crossbeam 4, a first moving mechanism 5, and a second moving mechanism 6.

[0021] The foundation is provided with a first base 81 and a second base 82. There are two second bases 82, which are respectively set on both sides of the first base 81. The workbench 1 is set on the first base 81. Each second base 82 is provided with two parallel first guide rails 71. The first guide rails 71 and the second guide rails 72 are arranged along the x-axis.

[0022] like Figure 4 and Figure 5 As shown, there are two moving columns 2, which are respectively set on the first guide rails 71 on both sides of the worktable 1, and the two moving columns 2 are fixedly connected by the first crossbeam 3. A first moving mechanism 5 is set on both sides of the worktable 1. The first moving mechanism 5 is used to drive the two moving columns 2 to move synchronously along the first guide rail 81 through gears and racks. The first moving mechanism 5 includes a rack 51, a gear 52, and a first drive unit 53. The rack 51 is set on the second base 82 and is parallel to the first guide rail 71. The first drive unit 53 is set on the moving column 2, and the gear 52 is rotatably set on the moving column 2. The output end of the first drive unit 53 is connected to the gear 52. The first drive unit 53 is used to drive the gear 52 to rotate, thereby moving the moving column 2 along the first guide rail 71.

[0023] In one implementation, each set of first moving mechanism 5 has two racks 51 and two gears 52. The teeth of the two racks 51 are arranged in opposite directions, and the two gears 52 are arranged opposite each other on both sides of the two racks 51. The two gears 52 mesh with the corresponding racks 51 respectively. The first driving unit 53 is used to drive the two gears 52 to rotate relative to each other, thereby driving the moving column 2 to move along the first guide rail 71.

[0024] like Figure 5As shown, preferably, a first fixed seat 54 is provided on the moving column 2, and the first drive unit 53 is fixed to the first fixed seat 54 by screws. The first fixed seat 54 has trapezoidal grooves 541 on both sides of the first drive unit 53. Trapezoidal blocks 55 are fixed in the trapezoidal grooves 541 by bolts. One end of the trapezoidal block 55 engages with the inclined surface of the trapezoidal groove 541, and the other end of the trapezoidal block 55 abuts against the first drive unit 53, so that the position of the first drive unit 53 can be finely adjusted by tightening the corresponding trapezoidal blocks 55. Specifically, the trapezoidal blocks 55 abut against the housing or fixing frame of the first drive unit 53.

[0025] like Figure 6 As shown, two parallel second guide rails 72 are provided on the top of the two moving columns 2. The second crossbeam 4 is disposed on the second guide rails 72, and a second drive unit 6 is provided on both sides of the second crossbeam 4. The second drive unit 6 is used to drive the second crossbeam 4 to move along the second guide rails 72. The second moving mechanism 6 includes a lead screw 61, a nut 62, and a second drive unit 63. The lead screw 61 is rotatably disposed on the top of the moving column 2. The second drive unit 63 is disposed on the top of the moving column 2, and the output end of the second drive unit 63 is connected to the lead screw 61. The nut 62 is disposed on the second crossbeam 4 and cooperates with the lead screw 61. The second drive unit 63 is used to drive the lead screw 61 to rotate, thereby driving the second crossbeam 4 to move along the second guide rails 72.

[0026] It is understood that "the component is mounted on the guide rail" means that the component is fixedly mounted on the slider of the guide rail, and the component can move along the guide rail via the slider. Preferably, both the first guide rail 71 and the second guide rail 72 are hydrostatic guide rails.

[0027] As one implementation method, such as Figure 4 As shown, the moving column 2 consists of a first box girder 21, a second box girder 22, and two box columns 23. The second box girder 22 is located above the first box girder 21. The first box girder 21 and the second box girder 22 are fixedly connected by the two box columns 21, which are located at both ends of the first box girder 21 and the second box girder 22. The first box girder 21, the second box girder 22, and the box columns 23 are fixed by welding. Specifically, to improve structural strength, reinforcing ribs are welded inside the first box girder 21, the second box girder 22, and the box columns 23. There are two first crossbeams 3, located at both ends of the second box girder 22, and the two first crossbeams 3 are fixedly connected to the second box girder 22 by welding.

[0028] An opening area is formed between the first crossbeam 3 and the second box beam 22. The second box beam 22 is equipped with a y-axis moving mechanism and a z-axis lifting mechanism. The z-axis lifting mechanism is equipped with a machining tool. Through the second moving mechanism 6, the y-axis moving mechanism and the z-axis lifting mechanism, the machining tool can be moved within the opening area to process the workpiece on the worktable 1.

[0029] like Figure 1 and Figure 2 As shown, a stop mechanism 9 is provided on the moving column 2. The stop mechanism 9 includes a brake caliper 91 and a hydraulic cylinder 92. A friction strip 821 is provided on the second base 82. The friction strip 821 is parallel to the first guide rail 71. The brake caliper 91 is provided on the moving column 2. The friction strip 821 is located in the jaw of the brake caliper 91. The hydraulic cylinder 92 is provided on the moving column 2. The hydraulic cylinder 92 can drive the brake caliper 91 to close so that the brake caliper 91 abuts against the friction strip 821. The brake caliper 91 can open when the hydraulic cylinder 92 is reset.

[0030] The brake caliper 91 includes a second fixed base 911, a caliper body 912, and a spring 913. The second fixed base 911 is mounted on the moving column 2. Two opposing caliper bodies 912 are hinged to the second fixed base 911. Friction plates 914 are provided at the bottom of the caliper body 912, and several guide wheels 915 are hinged to the top of the caliper body 912. The spring 913 is mounted on the second fixed base 911 and is used to provide a spring force that moves the bottoms of the two caliper bodies 912 away from each other. The output end of the hydraulic cylinder 92 is provided with a conical block 93, and several guide grooves 931 are provided on both sides of the conical block 93, and the guide wheel 915 can move along the guide grooves 931. Specifically, both sides of the conical block 93 are inclined surfaces. When the hydraulic cylinder 92 pushes the conical block 93 down, the guide wheel 915 can move along the guide groove 931 so that the tops of the two clamps 912 move away from each other and the bottoms of the two clamps 912 move closer to each other, so that the friction plate 914 abuts against the friction strip 821, thereby fixing the moving column 2 and the friction strip 821 relative to each other to resist the reaction force brought by the first crossbeam 4 when it moves or is processed. When the moving column 2 needs to move, the hydraulic cylinder 92 can drive the conical block 93 up, and the two clamps 912 will be reset under the elastic force of the spring 913 so that the friction plate 914 moves away from the friction strip 821.

[0031] Preferably, both friction plate 914 and friction plate 821 are made of wear-resistant material.

[0032] like Figure 3 As shown, in one embodiment, the clamp body 912 includes a lever arm 9121 and a mounting plate 9122. The number of lever arms 9121 is at least three. The bottom of each lever arm 9121 is fixedly connected to the mounting plate 9122. A friction plate 914 is detachably provided on the mounting plate 9122. A first shaft 9123 is provided in the middle of the lever arm 9121. The lever arm 9121 is hinged to a second fixed seat 911 through the first shaft 9123. A second shaft 9124 is provided at the top of the lever arm 9121. A guide wheel 915 is hinged to the second shaft 9124.

[0033] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A large stroke bed structure, characterized by, The workbench (1), the movable column (2), the first cross beam (3), the second cross beam (4), the first moving mechanism (5) and the second moving mechanism (6), both sides of the workbench (1) are provided with the first guide rail (71), the movable column (2) is arranged on the first guide rail (71), the two movable columns (2) are fixedly connected through the first cross beam (3), the first moving mechanism (5) is used for driving the movable column (2) to move along the first guide rail (71) through the gear and the rack, the top of the movable column (2) is provided with the second guide rail (72), the second cross beam (4) is arranged on the second guide rail (72), the second moving mechanism (6) is used for driving the second cross beam (4) to move along the second guide rail (72) through the lead screw and the nut, and the first guide rail (71) and the second guide rail (72) are parallel to each other.

2. The long-stroke bed structure according to claim 1, wherein The movable column (2) is composed of the first box beam (21), the second box beam (22) and the box column (23), the second box beam (22) is arranged above the first box beam (21), the first box beam (21) and the second box beam (22) are fixedly connected through the two box columns (23), and the two box columns (23) are arranged at the two ends of the first box beam (21) and the second box beam (22). The number of the first cross beam (3) is two, and the two first cross beams (3) are fixedly connected at the two ends of the two second box beams (22) respectively.

3. The long-stroke bed structure according to claim 1, wherein It also includes the first base (81) and the second base (82), both sides of the first base (81) are provided with the second base (82), the workbench (1) is arranged on the first base (81), and the first guide rail (71) is arranged on the second base (82).

4. The long-stroke bed structure according to claim 3, wherein The first moving mechanism (5) includes the rack (51), the gear (52) and the first driving unit (53), the rack (51) is arranged on the second base (82) and parallel to the first guide rail (71), the gear (52) is rotatably arranged on the movable column (2), the first driving unit (53) is arranged on the movable column (2), and the output end of the first driving unit (53) is connected with the gear (52), and the gear (52) is engaged with the rack (51).

5. The long-stroke bed structure according to claim 3, wherein The movable column (2) is provided with the first fixing seat (54), the first driving unit (53) is fixed on the first fixing seat (54) through screws, the first fixing seat (54) is provided with trapezoidal grooves (541) on the two sides of the first driving unit (53), trapezoidal blocks (55) are fixed in the trapezoidal grooves (541) through screws, and the trapezoidal blocks (55) abut against the first driving unit (53).

6. The long-stroke bed structure according to claim 1, wherein The second moving mechanism (6) comprises a screw rod (61), a nut (62) and a second driving unit (63), the screw rod (61) is rotationally arranged on the top of the movable column (2), the screw rod (61) is parallel to the second guide rail (72), the second driving unit (63) is arranged on the top of the movable column (2), the output end of the second driving unit (63) is connected with the screw rod (61), and the nut (62) is arranged on the bottom of the second cross beam (4) and matched with the screw rod (61).

7. The long-stroke bed structure according to claim 3, wherein The movable column (2) is provided with a stopping mechanism (9), the stopping mechanism (9) comprises a brake clamp (91) and a hydraulic cylinder (92), the second base (82) is provided with a friction strip (821), the friction strip (821) is parallel to the first guide rail (71), the brake clamp (91) is arranged on the movable column (2), the friction strip (821) is located in the clamp opening of the brake clamp (91), the hydraulic cylinder (92) is arranged on the movable column (2), the hydraulic cylinder (92) can drive the brake clamp (91) to close, so that the brake clamp (91) abuts against the friction strip (821), and the brake clamp (91) can be opened when the hydraulic cylinder (92) is reset.

8. The long-stroke bed structure according to claim 7, wherein The brake clamp (91) comprises a second fixed seat (911), a clamp body (912) and a spring (913), the second fixed seat (911) is arranged on the movable column (2), two oppositely arranged clamp bodies (912) are hinged on the second fixed seat (911), the bottom of the clamp body (912) is provided with a friction plate (914), and the spring (913) is arranged on the second fixed seat (911) and used for providing elastic force for moving the bottoms of the two clamp bodies (912) away from each other. The output end of the hydraulic cylinder (92) is provided with a tapered block (93), the hydraulic cylinder (92) can drive the tapered block (93) to move towards the clamp body (912) and push the tops of the two clamp bodies (912) away from each other, so that the bottoms of the two clamp bodies (912) are close to each other.

9. The long-stroke bed structure according to claim 8, wherein The top of the clamp body (912) is hinged with a plurality of guide wheels (915), and the two sides of the tapered block (93) are provided with guide grooves (931) matched with the guide wheels (915).

10. The long-stroke bed structure according to claim 9, wherein The clamp body (912) comprises a force arm (9121) and a mounting plate (9122), the number of the force arms (9121) is at least three, the bottoms of the force arms (9121) are fixedly connected with the mounting plate (9122), the mounting plate (9122) is detachably provided with the friction plate (914), the middle part of the force arm (9121) is provided with a first shaft body (9123), the force arm (9121) is hinged with the second fixed seat (911) through the first shaft body (9123), the top of the force arm (9121) is provided with a second shaft body (9124), and the guide wheel (915) is hinged on the second shaft body (9124).

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