Numerical control corner mechanism for large worktable

Abstract

The utility model discloses a large -scale workstation numerical control corner mechanism, including servo corner motor, rotary workstation, precision chain, chain tensioning adjusting mechanism and corner locking oil cylinder, servo corner motor drives rotary workstation through precision chain, and chain tensioning adjusting mechanism adjusts chain pre -tightening force in real time, and corner locking oil cylinder is used for locking workstation position, the precision chain is double -row roller chain, and the pitch error is less than or equal to 0.02mm, and the surface is carburizing hardening treatment, the rotary workstation bottom is equipped with annular guide rail, and annular guide rail surface coats wear -resistant ceramic coating. The utility model discloses, when using this large -scale workstation numerical control corner mechanism, the mechanism precision chain drive combines pre -tightening force adjusting mechanism, eliminates transmission gap, and transmission rigidity promotes more than 40%, and corner locking oil cylinder realizes millisecond level quick locking, and positioning repeat accuracy reaches plus or minus 0.001 DEG, and modular design is convenient for maintenance, and chain replacement time shortens to 30 minutes within.

Description

Technical Field

[0001] This utility model relates to the technical field of large worktable CNC cornering mechanism, and in particular to a large worktable CNC cornering mechanism. Background Technology

[0002] Existing large-scale CNC cornering mechanisms mostly employ toothed belt or gear drives. Toothed belt drives suffer from insufficient rigidity, easily leading to a decrease in cornering accuracy; while gear drives provide higher rigidity, they struggle to overcome transmission backlash, affecting positioning accuracy. Furthermore, traditional transmission mechanisms lack effective backlash compensation mechanisms, and prolonged use can result in accuracy degradation due to wear. Therefore, a cornering mechanism solution that combines high rigidity, backlash-free transmission, and ease of maintenance is needed.

[0003] To address these issues, we propose a large-scale CNC cornering mechanism for worktables. Utility Model Content

[0004] The purpose of this utility model is to provide a large-scale CNC cornering mechanism for worktables. When using this large-scale CNC cornering mechanism, the precision chain drive combined with the preload adjustment mechanism eliminates transmission gaps and increases transmission rigidity by more than 40%. In addition, the corner locking cylinder achieves millisecond-level rapid locking, and the positioning repeatability accuracy reaches ±0.001°. The modular design facilitates maintenance, and the chain replacement time is shortened to less than 30 minutes, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A large worktable CNC cornering mechanism includes a servo cornering motor, a rotary worktable, a precision chain, a chain tension adjustment mechanism, and a corner locking cylinder. The servo cornering motor drives the rotary worktable through the precision chain, the chain tension adjustment mechanism adjusts the chain preload in real time, and the corner locking cylinder is used to lock the position of the worktable.

[0007] In a further embodiment, the precision chain is a double-row roller chain with a pitch error ≤0.02mm and a surface treated with carburizing hardening.

[0008] In a further embodiment, the chain tension adjustment mechanism includes an eccentric wheel, a spring damping assembly, and a displacement sensor. The displacement sensor is connected to the control system to achieve dynamic tension compensation. The spring damping assembly is symmetrically arranged on both sides of the chain tension adjustment mechanism and connected to the eccentric wheel through a connecting rod. It is fixed on the bracket of the chain tension adjustment mechanism. The sensor probe is vertically aligned with the chain surface to detect the chain displacement in real time.

[0009] In a further embodiment, the corner locking cylinder adopts a hydraulically driven wedge block structure with a locking force ≥10kN and a response time <0.5s.

[0010] In a further embodiment, the bottom of the rotary table is provided with an annular guide rail, and the surface of the annular guide rail is coated with a wear-resistant ceramic coating, which, together with a precision roller bearing, achieves rotational positioning.

[0011] In a further embodiment, the cross-section of the annular guide rail is trapezoidal, with precision roller bearings symmetrically arranged on both sides. The preload of the precision roller bearings is adjusted by a disc spring, which is located within the preload adjustment device of the precision roller bearing, specifically installed between the inner ring of the bearing and the adjusting nut.

[0012] In a further embodiment, the servo rotary motor and the precision chain are connected by a flange coupling, and the flange coupling has an embedded torque sensor.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] In this utility model, when using the large workbench CNC cornering mechanism, the precision chain drive combined with the preload adjustment mechanism eliminates transmission gaps and increases transmission rigidity by more than 40%. The corner locking cylinder achieves millisecond-level rapid locking, and the positioning repeatability accuracy reaches ±0.001°. The modular design facilitates maintenance, and the chain replacement time is shortened to less than 30 minutes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a large-scale CNC cornering mechanism for worktables;

[0016] Figure 2 This is a side view of a large-scale CNC cornering mechanism for a workbench.

[0017] Figure 3 This is a side view of the internal structure of a large-scale CNC corner mechanism.

[0018] In the diagram: 1. Servo corner motor; 2. Rotary worktable; 3. Precision chain; 4. Chain tension adjustment mechanism; 5. Corner locking cylinder; 6. Circular guide rail; 7. Precision roller bearing; 8. Flange coupling; 9. Torque sensor; 10. Eccentric wheel. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3A large-scale CNC cornering mechanism for a workbench includes a servo cornering motor 1, which is connected to a precision chain 3 via a flange coupling 8. A torque sensor 9 is embedded inside the coupling, which monitors the transmission torque in real time and feeds it back to the CNC system. When the torque exceeds a set threshold, the system automatically cuts off the motor power to prevent overload damage to the chain or bearings. The precision chain 3 adopts a double-row roller chain design, with a carburized and hardened surface, and a pitch error controlled within 0.02mm to ensure smooth transmission without jumping. A chain tension adjustment mechanism 4 is installed on the non-drive side of the chain, and its eccentric wheel 10 is driven to rotate by a servo motor, changing the chain path length to adjust the preload. The spring damping assembly consists of two symmetrically arranged helical springs and a hydraulic damper, used to absorb the impact vibration during high-speed chain operation. A displacement sensor detects the chain displacement in real time and sends the data to the control system, dynamically correcting the angle of the eccentric wheel 10 to maintain constant chain tension. The bottom of the rotary table 2 is equipped with a ring-shaped guide rail 6. The guide rail has a trapezoidal cross-section and is coated with a 0.2mm thick alumina ceramic coating with a hardness ≥HV1200, significantly improving wear resistance. Precision roller bearings 7 are symmetrically arranged on both sides of the guide rail. The inner ring of the bearing is pre-tightened by a disc spring, and the pre-tightening force can be set to 5-15kN via an adjusting bolt, ensuring no radial clearance during table rotation. Angle locking cylinder 5 is installed below the guide rail. Its wedge block is made of high-strength alloy steel. The hydraulic system drives the wedge block to move tangentially along the guide rail, generating a clamping force ≥10kN during locking with a response time <0.5s, effectively eliminating minor displacement after positioning. During assembly, first, the servo angle motor 1 and flange coupling 8 are fixed to the base, then the precision chain 3 is installed, and the chain tension adjustment mechanism 4 is adjusted to the initial tension. The rotary table 2 is then assembled with the annular guide rail 6, and the concentricity of the precision roller bearing 7 is adjusted using a laser calibrator, with the error controlled within 0.005mm. Finally, the hydraulic lines and electrical control system are connected to complete the debugging.

[0023] The working principle of this utility model is as follows: As shown in the figure, it includes a servo angle motor 1, which is connected to a precision chain 3 via a flange coupling 8. A torque sensor 9 is embedded inside the coupling, which can monitor the transmission torque in real time and feed it back to the CNC system. When the torque exceeds a set threshold, the system automatically cuts off the motor power to prevent overload damage to the chain or bearings. The precision chain 3 adopts a double-row roller chain design, with a surface treated by carburizing and hardening. The pitch error is controlled within 0.02mm to ensure smooth transmission without jumping. The chain tension adjustment mechanism 4 is installed on the non-drive side of the chain. Its eccentric wheel 10 is driven to rotate by a servo motor, changing the chain path length to adjust the preload. The spring damping assembly consists of two sets of symmetrically arranged helical springs and hydraulic dampers, used to absorb the impact vibration during high-speed chain operation. A displacement sensor detects the chain displacement in real time and sends the data to the control system, dynamically correcting the angle of the eccentric wheel 10 to maintain constant chain tension. The bottom of the rotary table 2 is equipped with a ring-shaped guide rail 6. The guide rail has a trapezoidal cross-section and is coated with a 0.2mm thick alumina ceramic coating with a hardness ≥HV1200, significantly improving wear resistance. Precision roller bearings 7 are symmetrically arranged on both sides of the guide rail. The inner ring of the bearing is pre-tightened by a disc spring, and the pre-tightening force can be set to 5-15kN via an adjusting bolt, ensuring no radial clearance during table rotation. Angle locking cylinder 5 is installed below the guide rail. Its wedge block is made of high-strength alloy steel. The hydraulic system drives the wedge block to move tangentially along the guide rail, generating a clamping force ≥10kN during locking with a response time <0.5s, effectively eliminating minor displacement after positioning. During assembly, first, the servo angle motor 1 and flange coupling 8 are fixed to the base, then the precision chain 3 is installed, and the chain tension adjustment mechanism 4 is adjusted to the initial tension. The rotary table 2 is then assembled with the annular guide rail 6, and the concentricity of the precision roller bearing 7 is adjusted using a laser calibrator, with the error controlled within 0.005mm. Finally, the hydraulic lines and electrical control system are connected to complete the debugging.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A large-scale CNC cornering mechanism for a worktable, characterized in that: It includes a servo angle motor (1), a rotary table (2), a precision chain (3), a chain tension adjustment mechanism (4), and an angle locking cylinder (5). The servo angle motor (1) drives the rotary table (2) through the precision chain (3), the chain tension adjustment mechanism (4) adjusts the chain pretension in real time, and the angle locking cylinder (5) is used to lock the position of the table.

2. The large-scale worktable CNC cornering mechanism according to claim 1, characterized in that: The precision chain (3) is a double-row roller chain with a pitch error of ≤0.02mm and a surface treated with carburizing hardening.

3. The large-scale worktable CNC cornering mechanism according to claim 1, characterized in that: The chain tension adjustment mechanism (4) includes an eccentric wheel (10), a spring damping assembly, and a displacement sensor. The displacement sensor is connected to the control system to achieve dynamic tension compensation. The spring damping assembly is symmetrically arranged on both sides of the chain tension adjustment mechanism (4) and connected to the eccentric wheel (10) through a connecting rod. It is fixed on the bracket of the chain tension adjustment mechanism (4). The sensor probe is vertically aligned with the chain surface to detect the chain displacement in real time.

4. The large-scale worktable CNC cornering mechanism according to claim 1, characterized in that: The corner locking cylinder (5) adopts a hydraulically driven wedge block structure, with a locking force ≥10kN and a response time <0.5s.

5. The large-scale worktable CNC cornering mechanism according to claim 1, characterized in that: The rotary table (2) is provided with an annular guide rail (6) at the bottom, and the surface of the annular guide rail (6) is coated with a wear-resistant ceramic coating, which is used in conjunction with a precision roller bearing (7) to achieve rotational positioning.

6. The large-scale worktable CNC cornering mechanism according to claim 5, characterized in that: The cross section of the annular guide rail (6) is trapezoidal, with precision roller bearings (7) symmetrically arranged on both sides. The preload of the precision roller bearings (7) is adjusted by a disc spring, which is located in the preload adjustment device of the precision roller bearings (7), specifically installed between the inner ring of the bearing and the adjusting nut.

7. The large-scale worktable CNC cornering mechanism according to claim 1, characterized in that: The servo rotary motor (1) is connected to the precision chain (3) via a flange coupling (8), and the flange coupling (8) has a built-in torque sensor (9).

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