A compact, direct-drive rotary table with encoder

Abstract

This utility model relates to the technical field of pressure resistance testing devices, specifically to a compact direct-drive rotary table with an encoder. It includes a mounting housing, a bearing end cover fixedly mounted on the top of the housing, and a mounting base plate fixedly mounted on the bottom. A frameless motor is housed inside the housing, with its rotor fixedly connected to a hollow shaft. The top of the hollow shaft penetrates the interior of the bearing end cover, and a thin crossed roller bearing is fitted onto the outside of the hollow shaft. A bearing nut is installed at the bottom of the thin crossed roller bearing, which is located inside the mounting housing. By directly mounting the frameless motor rotor onto the hollow shaft, the frameless motor drives the shaft to rotate. The encoder disk is directly connected to the end of the hollow shaft. The distance between the code disk and the PCB board is ensured through machining, eliminating unnecessary parts and maximizing space savings for a more compact structure.

Description

Technical Field

[0001] This utility model relates to the technical field of pressure resistance testing devices, and in particular to a compact direct-drive rotary table with an encoder. Background Technology

[0002] A rotary table is a machine tool accessory with a rotatable table surface used to clamp workpieces and achieve rotation and indexing positioning. It is also called a turntable or fourth axis. In actual production, rotary work platforms are developing towards miniaturization and compactness to save space. Direct drive rotary work platforms realize the direct connection between the rotor and the load, eliminating the need for a transmission mechanism.

[0003] In the prior art, such as the patent with publication number CN218657200U, a rotary table is disclosed, including a motor, having a motor body and a motor shaft rotatably disposed on the motor body, a sealing seat fixed to the motor body and having a sealing end face, a rotary joint fixed to the motor shaft and rotatably disposed on the sealing seat and having a rotating end face, a rotor insulation plate fixed to the rotating end face, a stator insulation cover fixed to the sealing end face and sleeved on the outside of the rotor insulation plate, a working disk fixed to the rotor insulation plate, and a conductive electrode assembly fixed to the stator insulation cover and in conductive contact with the working disk.

[0004] The above structure significantly reduces the configuration space, but the transmission mechanism inside the rotary table occupies a large space, the overall structure is not compact enough, and it is prone to vibration, noise, wear and other phenomena. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose a compact direct-drive rotary table with encoder to solve the problems of large space occupied by the transmission mechanism inside the rotary table, insufficient overall compactness, and easy generation of vibration, noise, wear and other phenomena.

[0006] To achieve the above objectives, this utility model provides a compact, direct-drive rotary table with an encoder, comprising a mounting housing, a bearing end cover fixedly mounted on the top of the mounting housing, and a mounting base plate fixedly mounted on the bottom of the mounting housing; a frameless motor is disposed inside the mounting housing, and a hollow rotating shaft is fixedly connected to the rotor of the frameless motor, the top end of the hollow rotating shaft penetrating the interior of the bearing end cover; a thin cross roller bearing is sleeved on the outside of the hollow rotating shaft, a bearing nut is installed at the bottom of the thin cross roller bearing, and the thin cross roller bearing is disposed inside the mounting housing; an encoder code disk is sleeved on the bottom of the hollow rotating shaft, an encoder PCB board is connected to the encoder code disk, and the encoder PCB board is electrically connected to the frameless motor.

[0007] Preferably, a connector is fixedly installed on one side of the mounting housing, and the connector is connected to the encoder PCB board.

[0008] Preferably, the hollow shaft has a threaded hole and a pin hole on its end face, and the hollow shaft has a stepped shaft structure.

[0009] Preferably, two sets of screws are connected through the encoder PCB board and the mounting housing, and the screws are fitted with rubber sleeves, which are located inside the encoder PCB board.

[0010] Preferably, the outer diameter of the hollow shaft matches the inner diameter of the bearing end cap.

[0011] Preferably, the encoder PCB board and encoder code disk are coaxially arranged with the hollow rotating shaft, and the encoder PCB board and encoder code disk have openings inside for accommodating the hollow rotating shaft.

[0012] The beneficial effects of this utility model are: The rotary table uses thin-film crossed roller bearings and bearing nuts, saving space. At the same time, the motor rotor of the frameless motor is directly mounted on the hollow shaft, driving the hollow shaft to rotate. The encoder disk is directly connected to the end of the hollow shaft. The distance between the code disk and the PCB board is ensured through machining, eliminating unnecessary parts. The overall design saves space to the greatest extent, making the structure more compact. It has no gears, belts, reducers and other transmission mechanisms, and features low maintenance, low vibration, low noise, no wear and smooth movement. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural diagram of the entire utility model; Figure 2 This is a side view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of this utility model in its explosive state. Figure 4 This is a schematic diagram of the internal structure of the mounting housing of this utility model.

[0015] The markings in the diagram are: 1. Hollow shaft; 2. Bearing end cover; 3. Thin cross roller bearing; 4. Bearing nut; 5. Frameless motor; 6. Encoder PCB board; 7. Encoder code disk; 8. Mounting base plate; 9. Mounting housing; 10. Connector; 11. Screw; 12. Rubber sleeve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a compact direct-drive rotary table with encoder includes a mounting housing 9. A bearing end cover 2 is fixedly mounted on the top of the mounting housing 9, and a mounting base plate 8 is fixedly mounted on the bottom of the mounting housing 9. A frameless motor 5 is installed inside the mounting housing 9. A hollow shaft 1 is fixedly connected to the rotor inside the frameless motor 5. The top end of the hollow shaft 1 passes through the interior of the bearing end cover 2. A thin cross roller bearing 3 is sleeved on the outside of the hollow shaft 1. A bearing nut 4 is installed at the bottom of the thin cross roller bearing 3, and the thin cross roller bearing 3 is located inside the mounting housing 9. An encoder code disk 7 is sleeved on the bottom of the hollow shaft 1. An encoder PCB board 6 is connected to the encoder code disk 7, and the encoder PCB board 6 is electrically connected to the frameless motor 5.

[0018] In this embodiment, the rotary table uses thin-type crossed roller bearings 3 and bearing nuts 4, which saves space. At the same time, the motor rotor of the frameless motor 5 is directly mounted on the hollow shaft 1, driving the hollow shaft 1 to rotate. The encoder disk 7 is directly connected to the end of the hollow shaft 1. Through precision machining, the gap between the encoder disk 7 and the encoder PCB board 6 is ensured, eliminating unnecessary parts and maximizing space saving. The structure is more compact and there are no gears, belts, reducers or other transmission mechanisms. It has the characteristics of low maintenance, low vibration, low noise, no wear, and smooth movement.

[0019] As one implementation method, such as Figure 3 and Figure 4 As shown, a connector 10 is fixedly installed on one side of the mounting housing 9, and the connector 10 is connected to the encoder PCB board 6.

[0020] In this embodiment, the encoder PCB board 6 separates the hardware circuit and the induction coil circuit into separate boards and connects them through connector 10. The same hardware board can be used for different models of products, and only the induction coil board needs to be modified, which greatly enhances the versatility of the product.

[0021] As one implementation method, such as Figure 1 , Figure 2 and Figure 3 As shown, the end face of the hollow shaft 1 has a threaded hole and a pin hole, and the hollow shaft 1 has a stepped shaft structure.

[0022] In this embodiment, the hollow shaft 1 has a threaded hole and a pin hole on its end face for customer installation and use, ensuring end face runout. The motor rotor of the frameless motor 5 is directly mounted on the hollow shaft 1, driving the hollow shaft 1 to rotate. There are no gears, belts, reducers or other transmission mechanisms, saving space. It features low maintenance, low vibration, low noise, no wear, and smooth movement.

[0023] As one implementation method, such as Figure 1 , Figure 2 and Figure 3 As shown, two sets of screws 11 are connected through the encoder PCB board 6 and the mounting housing 9. The screws 11 are fitted with rubber sleeves 12, which are located inside the encoder PCB board 6.

[0024] In this embodiment, the rubber sleeve 12 is fitted onto the screw 11 and located inside the mounting hole of the encoder PCB board 6. The rubber sleeve 12 protects the encoder PCB board 6 and prevents the screw 11 from affecting the encoder PCB board 6 during the penetration process.

[0025] As one implementation method, such as Figure 1 , Figure 2 and Figure 3 As shown, the outer diameter of the hollow shaft 1 matches the inner diameter of the bearing end cover 2.

[0026] In this embodiment, the outer diameter of the hollow shaft 1 can be used as an installation reference and is concentric with the bearing end cover 2, thereby ensuring concentric installation and axial runout.

[0027] As one implementation method, such as Figure 1 , Figure 2 and Figure 3 As shown, the encoder PCB board 6 and encoder code disk 7 are both coaxially arranged with the hollow rotating shaft 1, and the encoder PCB board 6 and encoder code disk 7 have openings inside for accommodating the hollow rotating shaft 1.

[0028] In this embodiment, the encoder disk 7 is directly connected to the end of the hollow rotating shaft 1. The distance between the disk and the PCB board is ensured through processing, eliminating unnecessary parts and saving space.

[0029] Working principle: During use, the rotary table adopts thin cross roller bearings 3 and bearing nuts 4, which saves space. At the same time, the motor rotor of the frameless motor 5 is directly mounted on the hollow shaft 1, driving the hollow shaft 1 to rotate. The encoder disk 7 is directly connected to the end of the hollow shaft 1. Through precision machining, the gap between the encoder disk 7 and the encoder PCB board 6 is ensured, eliminating unnecessary parts and maximizing space saving. The structure is more compact and there are no gears, belts, reducers and other transmission mechanisms. It has the characteristics of low maintenance, low vibration, low noise, no wear, and smooth movement. Meanwhile, the hardware board and the induction coil board in the encoder PCB board 6 are separate and connected by connector 10. The same hardware board can be used for different models of products, and only the induction coil board needs to be modified, which greatly enhances the versatility of the product.

[0030] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0031] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A compact direct drive rotary table with an encoder, comprising a mounting housing (9), characterized in that, The top of the mounting housing (9) is fixedly fitted with a bearing end cover (2), and the bottom of the mounting housing (9) is fixedly fitted with a mounting base plate (8); a frameless motor (5) is installed inside the mounting housing (9), and the rotor inside the frameless motor (5) is fixedly connected with a hollow shaft (1), the top of the hollow shaft (1) penetrating the interior of the bearing end cover (2); a thin cross roller bearing (3) is fitted on the outside of the hollow shaft (1), a bearing nut (4) is installed at the bottom of the thin cross roller bearing (3), and the thin cross roller bearing (3) is located inside the mounting housing (9); an encoder code disk (7) is fitted on the bottom of the hollow shaft (1), an encoder PCB board (6) is connected to the encoder code disk (7), and the encoder PCB board (6) is electrically connected to the frameless motor (5).

2. The compact direct-drive rotary table with encoder according to claim 1, characterized in that, A connector (10) is fixedly installed on one side of the mounting housing (9), and the connector (10) is connected to the encoder PCB board (6).

3. A compact direct-drive rotary table with encoder according to claim 1, characterized in that, The hollow shaft (1) has a threaded hole and a pin hole on its end face, and the hollow shaft (1) has a stepped shaft structure.

4. A compact direct-drive rotary table with encoder according to claim 1, characterized in that, Two sets of screws (11) are connected through the encoder PCB board (6) and the mounting housing (9). The screws (11) are fitted with rubber sleeves (12), which are located inside the encoder PCB board (6).

5. A compact direct-drive rotary table with encoder according to claim 1, characterized in that, The outer diameter of the hollow shaft (1) matches the inner diameter of the bearing end cover (2).

6. A compact direct-drive rotary table with encoder according to claim 1, characterized in that, The encoder PCB board (6) and encoder code disk (7) are both coaxially arranged with the hollow rotating shaft (1), and the encoder PCB board (6) and encoder code disk (7) have openings inside for accommodating the hollow rotating shaft (1).

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