Rotary table and machining center

Abstract

The utility model provides a rotary table. The rotary table comprises a first connecting seat and an inclined shaft which is rotatably arranged on the first connecting seat, the transmission assembly and the anti-backlash action assembly are arranged in the first connecting seat; the transmission assembly comprises a first transmission shaft and a second transmission shaft, the first transmission shaft is used for being connected with a power source, and the second transmission shaft is used for driving the inclined shaft to rotate; the first transmission shaft is provided with a first meshing part, the second transmission shaft is provided with a second meshing part, the first meshing part is connected with the second meshing part in a meshing mode, and the gap eliminating function assembly is used for keeping meshing between the first meshing part and the second meshing part. The utility model further provides a machining center. According to the rotary table provided by the utility model, the positioning precision and the repeated positioning precision of the rotary table can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of processing equipment, in particular to a turntable. Background Art

[0002] The turntable is usually installed on the base of the machine tool to form a four-axis machine tool or a five-axis machine tool.

[0003] For example, see Figure 1 In the patent with patent publication number CN 210255128U, a high-precision workbench is disclosed. For the transmission structure that drives the cradle 6 to rotate, specifically, it is mainly a turbine 3 and a worm 2 that mesh with each other. The worm 2 is connected to the motor, and the turbine 3 is connected to the cradle 6. Specifically, the cradle 6 is provided with a main shaft 4 connected to the main turntable 1, and the main shaft 4 is installed with the turbine 3. When the motor drives the worm 2 to rotate, the worm 2 rotates, and the helical teeth on the worm 2 abut against the transmission teeth on the turbine 3, thereby pushing the transmission teeth to move. Since the transmission teeth are integrated with the turbine 3, the turbine 3 is driven to rotate. Conventionally, when it is necessary to rotate the cradle 6 in the opposite direction, the contact surface 9 of the helical teeth and the transmission teeth will be different. Specifically, as Figure 3 As shown, the spiral tooth is located between the two transmission teeth. When the direction of rotation is different, the contact between the spiral tooth and one transmission tooth will become the contact between the spiral tooth and the other transmission tooth. It is common sense that the gap between the two transmission teeth is larger than the size of the spiral tooth, so that the spiral tooth can easily enter between the two transmission teeth. In other words, when the direction of rotation changes, the spiral tooth will move a distance, and this distance will not drive the transmission tooth, and will not cause the cradle 6 to rotate, so that the rotation angle of the cradle 6 is deviated.

[0004] In the above patent, there is a gap between the helical teeth on the worm 2 and the transmission teeth on the turbine 3, thereby reducing the positioning accuracy and repeatability of the machine tool.

[0005] Therefore, how to improve the positioning accuracy and repeatability of the turntable is an urgent problem to be solved. Utility Model Content

[0006] The utility model provides a turntable, which can improve the positioning accuracy and repeated positioning accuracy of the turntable.

[0007] The utility model provides a turntable, comprising a first connecting seat and an inclined shaft rotatably mounted on the first connecting seat; and also comprising a transmission component and a backlash elimination component arranged in the first connecting seat;

[0008] The transmission assembly includes a first transmission shaft and a second transmission shaft, wherein the first transmission shaft is used to connect to a power source, and the second transmission shaft is used to drive the tilting shaft to rotate;

[0009] The first transmission shaft has a first meshing portion, the second transmission shaft has a second meshing portion, the first meshing portion is meshingly connected with the second meshing portion, and the anti-backlash component is used to keep the first meshing portion and the second meshing portion meshing.

[0010] In some feasible embodiments, the rotation axis of the first transmission shaft is perpendicular to the rotation axis of the second transmission shaft, the first meshing portion includes a first bevel gear portion, and the second meshing portion includes a second bevel gear portion matched with the first bevel gear portion;

[0011] The anti-backlash component includes a thrust piece, and a thrust end of the thrust piece is used to push the second bevel gear portion toward the first bevel gear portion in the axial direction.

[0012] In some feasible embodiments, the push member includes an elastic member, one end of the elastic member abuts against the first bevel gear portion or the second bevel gear portion, and the other end of the elastic member abuts against the inner wall of the first connecting seat away from the inclined axis.

[0013] In some feasible embodiments, the transmission assembly further includes a reduction mechanism, which is disposed between the second transmission shaft and the inclined shaft to increase the transmission torque between the second transmission shaft and the inclined shaft by reducing the rotational speed of the inclined shaft relative to the second transmission shaft.

[0014] In some feasible embodiments, the deceleration mechanism includes a first gear and a second gear, the axial direction of the first gear is parallel to the axial direction of the second gear, the first gear is arranged on the second transmission shaft, the second gear is arranged on the inclined shaft, the number of teeth of the first gear is less than the number of teeth of the second gear, and the second transmission shaft and the inclined shaft are matched through the transmission of the first gear and the second gear to increase the transmission torque between the second transmission shaft and the inclined shaft.

[0015] The utility model also provides a machining center, comprising a base and the above-mentioned turntable arranged on the base.

[0016] In some feasible embodiments, the number of teeth of the first meshing portion is less than the number of teeth of the second meshing portion, the power source is fixedly mounted on the front end surface of the first connecting seat and the power source is transmission-connected to the power input end of the transmission component, and the power output end of the transmission component is transmission-connected to the inclined shaft.

[0017] In some feasible embodiments, the machining center further comprises a second connecting seat, the second connecting seat is spaced apart from the first connecting seat, and one end of the tilting shaft away from the first connecting seat is rotatably connected to the second connecting seat;

[0018] The machining center further comprises a bearing, which is arranged between the first connecting seat and the anti-backlash component so that the anti-backlash component can rotate together with the first transmission shaft or the second transmission shaft, or

[0019] The machining center also includes a bearing, which is arranged between the anti-backlash component and the first meshing portion, or between the anti-backlash component and the second meshing portion, so that the anti-backlash component can be fixed to the first connecting seat through the bearing or can be fixed to the second connecting seat through the bearing.

[0020] In some feasible embodiments, a connecting bridge is further included, and the first connecting seat and the second connecting seat are both slidably connected to the base via the connecting bridge.

[0021] In some feasible embodiments, a first slide rail group and a second slide rail group are respectively provided on both sides of the upper surface of the base, the first slide rail group includes two first sub-slide rails that are not at the same height and are arranged at intervals, and one end of the connecting bridge is provided with two first sliders that are arranged at intervals and slideably cooperate with the two first sub-slide rails; the second slide rail group includes two second sub-slide rails that are not at the same height and are arranged at intervals, and the other end of the connecting bridge is provided with two second sliders that are arranged at intervals and slideably cooperate with the two second sub-slide rails.

[0022] The above-mentioned turntable, by setting the transmission component, includes a first transmission shaft and a second transmission shaft, wherein the first transmission shaft is used to connect to a power source, and the second transmission shaft is used to drive the tilting shaft to rotate; the first transmission shaft has a first meshing portion, and the second transmission shaft has a second meshing portion, the first meshing portion is meshingly connected with the second meshing portion, and the anti-backlash component is used to keep the first meshing portion and the second meshing portion meshing, and is used to reduce the transmission clearance between the first transmission shaft and the second transmission shaft, thereby improving the positioning accuracy and repeatability of the turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work.

[0024] Figure 1 A three-dimensional diagram of a numerically controlled turntable with a gravity balancing function provided in the prior art.

[0025] Figure 2 A three-dimensional diagram of a turntable provided in accordance with an embodiment of the present utility model.

[0026] Figure 3 A top view of the internal structure of the first connecting seat of the turntable provided in one embodiment of the utility model.

[0027] Figure 4 A three-dimensional schematic diagram of a machining center provided in one embodiment of the utility model.

[0028] Figure 5 A schematic diagram of another installation position of a bearing in a machining center provided by an embodiment of the utility model.

[0029] Component Symbols

[0030] 100, first connecting seat; 200, tilting axis; 300, transmission assembly; 310, first transmission shaft; 311, first meshing portion; 320, second transmission shaft; 321, second meshing portion; 330, speed reduction mechanism; 331, first gear; 332, second gear; 400, anti-backlash assembly; 411, elastic member; 500, power source; 600, bearing; 700, base; 710, first slide rail group; 711, first sub-slide rail; 720, second slide rail group; 721, second sub-slide rail; 800, connecting bridge; 900, second connecting seat.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In order to make the content of the utility model more clearly and more accurately understood, it will now be described in detail with reference to the accompanying drawings. The accompanying drawings of the specification illustrate examples of embodiments of the utility model, wherein the same reference numerals represent the same elements. It is understood that the scales shown in the accompanying drawings of the specification are not the scales of the actual implementation of the utility model, which are only for the purpose of illustration and are not drawn according to the original size.

[0036] Please see Figure 2 and 3 The utility model provides a turntable, which includes a first connecting seat 100 and an inclined shaft 200 rotatably mounted on the first connecting seat 100; a sliding portion is provided at the bottom of the first connecting seat 100, and the sliding portion is used for sliding connection with the base 700. At this time, the turntable is a single-arm turntable. Of course, it can be understood that in some other embodiments, the turntable can be a double-arm turntable.

[0037] Please see Figure 2 and 3The turntable further comprises a transmission assembly 300 and a backlash elimination assembly 400 disposed in the first connection seat 100; the transmission assembly 300 comprises a first transmission shaft 310 and a second transmission shaft 320, wherein the first transmission shaft 310 is used to connect with the power source 500, and the second transmission shaft 320 is used to drive the tilting shaft 200 to rotate; the first transmission shaft 310 has a first meshing portion 311, and the second transmission shaft 320 has a second meshing portion 321, the first meshing portion 311 is meshed and connected with the second meshing portion 321, the The anti-backlash component 400 is used to keep the first meshing portion 311 and the second meshing portion 321 meshed, so that when the power source 500 rotates from forward to reverse, the power source 500 can timely transmit power to the tilting shaft 200 through the first meshing portion 311 and the second meshing portion 321, so as to avoid the gap between the first meshing portion 311 and the second meshing portion 321, which causes the power source 500 to delay transmitting power to the tilting shaft 200 when the power source 500 rotates from forward to reverse, thereby reducing the positioning accuracy and repeatability of the machine tool. The anti-backlash component 400 reduces the transmission gap between the power source 500 and the transmission assembly 300, so that the power source 500 and the transmission assembly 300 can maintain a stable contact, avoid looseness between the power source 500 and the transmission assembly 300, ensure the continuous and stable connection between the power source 500 and the transmission assembly 300, and improve the positioning accuracy and repeatability of the machine tool.

[0038] In this embodiment, the power source 500 includes a torque motor, which has a faster response and occupies less space than a traditional servo motor.

[0039] Please see Figure 3 In this embodiment, the rotation axis of the first transmission shaft 310 is perpendicular to the rotation axis of the second transmission shaft 320, so that the power transmission direction of the power source 500 can be changed through the first transmission shaft 310 and the second transmission shaft 320. In addition, the power source 500 and the first transmission shaft 310 can be arranged perpendicular to each other, thereby improving the compactness of the turntable structure and avoiding the turntable from being too long along the length direction. Specifically, the first meshing portion 311 includes a first bevel gear portion, and the second meshing portion 321 includes a second bevel gear portion that cooperates with the first bevel gear portion; the anti-backlash assembly 400 includes a thrust piece, and the thrust end of the thrust piece is used to push the second bevel gear portion axially toward the first bevel gear portion, thereby reducing the transmission gap between the first bevel gear portion and the second bevel gear portion, thereby enabling the first bevel gear portion and the second bevel gear portion to maintain a compact abutment, so that when the power source 500 changes from forward rotation to reverse rotation or from reverse rotation to forward rotation, the power source 500 can promptly transmit power to the tilting shaft 200 through the first bevel gear portion and the second bevel gear portion, thereby improving the positioning accuracy and repeatability of the machine tool.

[0040] Please see Figure 3 In this embodiment, the push member includes an elastic member 411, one end of the elastic member 411 abuts against the first bevel gear part or the second bevel gear part, and the other end of the elastic member 411 abuts against the inner wall of the first connecting seat 100 away from the tilting shaft 200. For example, the elastic member 411 can be a spring, and the preload force of the spring can be determined according to actual conditions. For example, when the transmission clearance between the power source 500 and the first transmission shaft 310 needs to be smaller, the preload force of the spring can be increased, that is, the compression amount of the spring is increased and the length of the spring is shortened; when the transmission clearance between the power source 500 and the first transmission shaft 310 needs to be increased, the preload force of the spring can be reduced, that is, the compression amount of the spring is reduced and the length of the spring is increased.

[0041] Please see Figure 3 The transmission assembly 300 further includes a speed reduction mechanism 330, which is disposed between the second transmission shaft 320 and the tilting shaft 200 to increase the transmission torque between the second transmission shaft 320 and the tilting shaft 200 by reducing the rotation speed of the tilting shaft 200 relative to the second transmission shaft 320. In this embodiment, the speed reduction mechanism 330 includes a first gear 331 and a second gear 332, both of which are spur gears, the axial direction of the first gear 331 is parallel to the axial direction of the second gear 332, the first gear 331 is disposed on the second transmission shaft 320, the second gear 332 is disposed on the tilting shaft 200, the number of teeth of the first gear 331 is less than the number of teeth of the second gear 332, and the second transmission shaft 320 and the tilting shaft 200 cooperate through the transmission of the first gear 331 and the second gear 332 to increase the transmission torque between the second transmission shaft 320 and the tilting shaft 200.

[0042] The above-mentioned turntable, by setting the transmission assembly 300, includes a first transmission shaft 310 and a second transmission shaft 320, wherein the first transmission shaft 310 is used to connect with the power source 500, and the second transmission shaft 320 is used to drive the tilting shaft 200 to rotate; the first transmission shaft 310 has a first meshing portion 311, and the second transmission shaft 320 has a second meshing portion 321, the first meshing portion 311 is meshed and connected with the second meshing portion 321, and the anti-backlash assembly 400 is used to keep the first meshing portion 311 and the second meshing portion 321 meshed, and is used to reduce the transmission clearance between the first transmission shaft 310 and the second transmission shaft 320, thereby improving the positioning accuracy and repeated positioning accuracy of the turntable.

[0043] Please see Figure 4The utility model also provides a machining center, including a base 700 and the above-mentioned turntable arranged on the base 700. The number of teeth of the first meshing portion 311 is less than the number of teeth of the second meshing portion 321, the power source 500 is fixedly mounted on the front end surface of the first connecting seat 100 and the power source 500 is transmission-connected with the power input end of the transmission assembly 300, and the power output end of the transmission assembly 300 is transmission-connected with the tilting shaft 200. The power input end of the transmission assembly 300 is located at one end of the second transmission shaft 320, and the output end of the transmission assembly 300 is located at one end of the second transmission shaft 320 close to the tilting shaft 200, so that the space at both ends of the second transmission shaft 320 can be reasonably and fully utilized, making the spatial arrangement of the second transmission shaft 320 more reasonable.

[0044] Please see Figure 4 The machining center further includes a second connection seat 900, which is spaced apart from the first connection seat 100, and one end of the tilting shaft 200 away from the first connection seat 100 is rotatably connected to the second connection seat 900. By providing the first connection seat 100 and the second connection seat 900, when the tilting shaft 200 rotates, both ends of the tilting shaft 200 can be rotatably connected to the first connection seat 100 and the second connection seat 900, so that the rotation of the tilting shaft 200 is more stable.

[0045] The machining center further includes a bearing 600, and the turntable may be a single-arm turntable. The bearing 600 is disposed between the first connection seat 100 and the anti-backlash component 400, so that the anti-backlash component 400 can rotate together with the first transmission shaft 310 or the second transmission shaft 320. For example, the bearing 600 includes an inner ring and an outer ring that rotate with each other, one of the inner ring and the outer ring is fixedly connected to the first connection seat 100, and the other of the inner ring and the outer ring is fixedly connected to the anti-backlash component 400, so that the anti-backlash component 400 can rotate relative to the first connection seat 100 and the anti-backlash component 400 can rotate relative to the second connection seat 900; for example, the inner ring is fixedly connected to the first connection seat 100, and the outer ring is fixedly connected to the anti-backlash component 400; for another example, the outer ring is fixedly connected to the first connection seat 100, and the inner ring is fixedly connected to the anti-backlash component 400.

[0046] Please see Figure 4 The turntable is a cradle turntable, and a bearing 600 is arranged between the first connecting seat 100 and the anti-backlash component 400, and the bearing 600 is also arranged between the second connecting seat 900 and the anti-backlash component 400, so that the anti-backlash component 400 can rotate together with the first transmission shaft 310 or the second transmission shaft 320, and the first engaging portion 311 and the second engaging portion 321 remain engaged.

[0047] Please see Figure 5 In some other embodiments, the machining center also includes a bearing 600, and the bearing 600 is arranged between the anti-backlash component 400 and the first meshing portion 311, or the bearing 600 is arranged between the anti-backlash component 400 and the second meshing portion 321, so that the anti-backlash component 400 can be kept fixed to the first connecting seat 100 through the bearing 600 or can be kept fixed to the second connecting seat 900 through the bearing 600. For example, the bearing 600 includes an inner ring and an outer ring that rotate with each other, one of the inner ring and the outer ring is fixedly connected to the first meshing portion 311 or the second meshing portion 321, and the other of the inner ring and the outer ring is fixedly connected to the anti-backlash component 400. For example, one end of the anti-backlash component 400 can remain fixed relative to the first connecting seat 100, and the other end of the anti-backlash component 400 can be fixedly connected to the inner ring of the bearing 600, and the outer ring of the bearing 600 can also remain fixed relative to the first meshing portion 311 or the second meshing portion 321. In this way, while ensuring that under the action of the bearing 600, the anti-backlash component 400 is in a non-rotating state, while axially pressing against the first meshing portion 311 or the second meshing portion 321 through the bearing 600, the first meshing portion 311 or the second meshing portion 321 can also rotate freely.

[0048] Please see Figure 4 The machining center further includes a connecting bridge 800, and the first connecting seat 100 and the second connecting seat 900 are both slidably connected to the base 700 through the connecting bridge 800. By providing the connecting bridge 800, the first connecting seat 100 and the second connecting seat 900 can be driven to slide relative to the base 700 by driving the connecting bridge 800, thereby avoiding errors caused by the first connecting seat 100 and the second connecting seat 900 being driven by two different drives respectively and resulting in asynchronous rotation of the first connecting seat 100 and the second connecting seat 900.

[0049] Please see Figure 4 A first slide rail group 710 and a second slide rail group 720 are respectively provided on both sides of the upper surface of the base 700. The first slide rail group 710 includes two first sub-slide rails 711 that are not at the same height and are spaced apart. One end of the connecting bridge 800 is provided with two first sliders that are spaced apart and slidably cooperate with the two first sub-slide rails 711; the second slide rail group 720 includes two second sub-slide rails 721 that are not at the same height and are spaced apart. The other end of the connecting bridge 800 is provided with two second sliders that are spaced apart and slidably cooperate with the two second sub-slide rails 721, so that the connecting bridge 800 can stably slide relative to the base 700 through two first sub-slide rails 711 of different heights and two second sub-slide rails 721 of different heights.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0051] The above examples are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A turntable, comprising a first connecting seat (100) and an inclined shaft (200) rotatably mounted on the first connecting seat (100); characterized in that: It also includes a transmission assembly (300) and a backlash elimination assembly (400) arranged in the first connection seat (100); The transmission assembly (300) comprises a first transmission shaft (310) and a second transmission shaft (320), wherein the first transmission shaft (310) is used to be connected to a power source (500), and the second transmission shaft (320) is used to drive the tilting shaft (200) to rotate; The first transmission shaft (310) has a first meshing portion (311), the second transmission shaft (320) has a second meshing portion (321), the first meshing portion (311) and the second meshing portion (321) are meshingly connected, and the anti-backlash component (400) is used to maintain the meshing between the first meshing portion (311) and the second meshing portion (321).

2. The turntable according to claim 1, characterized in that: The rotation axis of the first transmission shaft (310) is perpendicular to the rotation axis of the second transmission shaft (320); the first meshing portion (311) includes a first bevel gear portion; and the second meshing portion (321) includes a second bevel gear portion that matches the first bevel gear portion. The anti-backlash component (400) comprises a thrust piece, the thrust end of which is used to cause the second bevel gear part to be pushed in the axial direction toward the first bevel gear part.

3. The turntable according to claim 2, characterized in that: The push member comprises an elastic member (411), one end of the elastic member (411) abuts against the first bevel gear portion or the second bevel gear portion, and the other end of the elastic member (411) abuts against the inner wall of the first connecting seat (100) away from the tilting axis (200).

4. The turntable according to claim 2, characterized in that: The transmission assembly (300) further comprises a speed reduction mechanism (330), which is arranged between the second transmission shaft (320) and the tilting shaft (200) so as to increase the transmission torque between the second transmission shaft (320) and the tilting shaft (200) by reducing the rotation speed of the tilting shaft (200) relative to the second transmission shaft (320).

5. The turntable according to claim 4, characterized in that: The speed reduction mechanism (330) comprises a first gear (331) and a second gear (332); the axial direction of the first gear (331) is parallel to the axial direction of the second gear (332); the first gear (331) is arranged on the second transmission shaft (320); the second gear (332) is arranged on the tilting shaft (200); the number of teeth of the first gear (331) is less than the number of teeth of the second gear (332); the second transmission shaft (320) and the tilting shaft (200) are matched through the transmission of the first gear (331) and the second gear (332) to improve the transmission torque between the second transmission shaft (320) and the tilting shaft (200).

6. A machining center, characterized in that: The invention comprises a base (700) and a turntable according to any one of claims 1 to 5 arranged on the base (700).

7. The machining center according to claim 6, characterized in that: The number of teeth of the first meshing portion (311) is less than the number of teeth of the second meshing portion (321); the power source (500) is fixedly mounted on the front end surface of the first connecting seat (100) and the power source (500) is transmission-connected to the power input end of the transmission assembly (300); and the power output end of the transmission assembly (300) is transmission-connected to the tilting shaft (200).

8. The machining center according to claim 6, characterized in that: The machining center further comprises a second connecting seat (900), the second connecting seat (900) being spaced apart from the first connecting seat (100), and one end of the tilting shaft (200) away from the first connecting seat (100) being rotatably connected to the second connecting seat (900); The machining center further comprises a bearing (600), wherein the bearing (600) is arranged between the first connecting seat (100) and the anti-backlash component (400), so that the anti-backlash component (400) can rotate together with the first transmission shaft (310) or the second transmission shaft (320), or The machining center further comprises a bearing (600), wherein the bearing (600) is arranged between the anti-backlash component (400) and the first meshing portion (311), or the bearing (600) is arranged between the anti-backlash component (400) and the second meshing portion (321), so that the anti-backlash component (400) can be fixed to the first connecting seat (100) through the bearing (600) or can be fixed to the second connecting seat (900) through the bearing (600).

9. The machining center according to claim 8, characterized in that: It also includes a connecting bridge (800), and the first connecting seat (100) and the second connecting seat (900) are both slidably connected to the base (700) via the connecting bridge (800).

10. The machining center according to claim 9, characterized in that: A first slide rail group (710) and a second slide rail group (720) are respectively provided on both sides of the upper surface of the base (700), the first slide rail group (710) comprising two first sub-slide rails (711) which are not at the same height and are arranged at intervals, and one end of the connecting bridge (800) is provided with two first sliding blocks which are arranged at intervals and are slidably matched with the two first sub-slide rails (711); The second slide rail group (720) comprises two second sub-slide rails (721) which are not at the same height and are arranged at intervals, and the other end of the connecting bridge (800) is provided with two second sliding blocks which are arranged at intervals and are slidably matched with the two second sub-slide rails (721).

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