Direct connection type servo motor for resistance spot welding

Abstract

The utility model discloses a direct connection type servo motor for resistance spot welding. The direct connection type servo motor comprises a motor, a supporting seat, a cylinder barrel, a bearing seat and a power actuating mechanism, the power executing mechanism is directly connected with an output shaft of the motor through the lead screw, and the lead screw nut is in threaded fit with the lead screw and drives the push rod to reciprocate. The anti-rotation guide mechanism restrains linear motion of the lead screw nut through a guide rod and a guide shaft sleeve and prevents the lead screw nut from rotating. A scraper, a sealing ring and a shaft sleeve are arranged at the front end of the supporting base, and sealing performance and stability of movement of the push rod are guaranteed. Through the direct connection type transmission structure and the anti-rotation guide design, the transmission efficiency and precision are improved, and the direct connection type transmission device has the advantages of being resistant to impact, dustproof and easy to maintain.

Description

Technical Field

[0001] This utility model relates to the technical field, specifically a direct-drive servo motor for resistance spot welding. Background Technology

[0002] When direct-drive servo motors are used in robotic resistance welding, there is a need for anti-rotation guidance of their push rods. Existing direct-drive servo motors require an external anti-rotation guidance mechanism, which is relatively complex in structure and has high requirements for the processing and assembly accuracy of parts and the final debugging. At the same time, it also makes the structure of the robotic resistance welding equipment larger and occupies more space. Therefore, it is necessary to design a direct-drive servo motor with an internal anti-rotation guidance mechanism. Summary of the Invention

[0003] The purpose of this invention is to provide a direct-drive servo motor for resistance spot welding to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A direct-drive servo motor for resistance spot welding includes a power actuator, a motor, a support base, a cylinder, and a bearing housing; the cylinder is placed between the support base and the bearing housing, the motor is connected to the power actuator, and the motor drives the power actuator system to perform reciprocating linear motion through an anti-rotation guide mechanism.

[0006] In this embodiment of the invention, the power actuator includes a lead screw disposed inside the cylinder, the rear end of the lead screw is connected to an output shaft disposed at the front end of the motor via a flat key, a bearing is fitted on the outer side of the lead screw, and a bearing seat is rotatably connected to the end of the bearing facing the motor.

[0007] Both the output shaft and the lead screw have keyways, which are then used in conjunction with a flat key to ensure the connection between the lead screw and the output shaft.

[0008] The bearing is fixed by a lock nut, and its front end is positioned by a snap ring. A push rod is set at the front end of the lead screw, and a shaft hole is opened inside the push rod. One end of the lead screw extends into the shaft hole with a gap distribution. A lead screw nut is threaded onto the lead screw. A lead screw nut guide seat is connected to the outside of the lead screw nut by a flat key. The flat key is positioned by screws and locking blocks to prevent loosening and ensure smooth transmission. The front end of the lead screw nut guide seat is locked to the tail end of the push rod by screws. At the same time, an anti-rotation guide mechanism is set on the outside of the lead screw nut to guide the linear movement of the lead screw nut. When the motor starts, the control output shaft drives the lead screw to rotate. At this time, the lead screw nut synchronously drives the lead screw nut guide seat to reciprocate linearly along the lead screw, thereby driving the push rod to reciprocate and extend.

[0009] Specifically, a set of support seats is movably installed on the outer side of the push rod, and the push rod moves through the support seats to extend and retract.

[0010] Compared with the prior art, the beneficial effects of this utility model are: by directly connecting the lead screw to the motor output shaft and using a flat key to transmit torque, intermediate transmission losses are reduced;

[0011] The precise fit between the guide rod and the guide bushing ensures that the lead screw nut moves only in a straight line, preventing rotational deviation.

[0012] The direct-connect design saves space and is suitable for scenarios with strict requirements on equipment size, such as resistance spot welding. Attached Figure Description

[0013] Figure 1 This is a partial cross-sectional schematic diagram of a direct-drive servo motor used for resistance spot welding.

[0014] Figure 2 This is a cross-sectional schematic diagram of a direct-drive servo motor used for resistance spot welding.

[0015] Figure 3 This is a schematic diagram of the anti-rotation guide mechanism in a direct-drive servo motor used for resistance spot welding.

[0016] Figure 4 for Figure 1 A magnified structural diagram of A in the middle.

[0017] The components are as follows: push rod 1, snap ring 2, scraper 3, sealing ring 4, bushing 5, support seat 6, lead screw 7, cylinder 8, flat key 9, locking block 10, lead screw nut guide seat 11, buffer pad 12, snap ring 13, bearing 14, locking nut 15, bearing seat 16, motor 17, cover plate 18, snap ring 19, guide rod 20, washer 21, guide bushing 22, nut 24, grease nipple 25, screw 26, lead screw nut 27, output shaft 28, screw 29. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[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 present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] Please see Figures 1-4 A direct-drive servo motor for resistance spot welding includes a power actuator, a motor 17, a support base 6, a cylinder 8, and a bearing housing 16. The cylinder 8 is placed between the support base 6 and the bearing housing 16. The motor 17 is connected to the power actuator and drives the power actuator system to perform reciprocating linear motion through an anti-rotation guide mechanism.

[0023] In this embodiment of the invention, the power actuator includes a lead screw 7 disposed inside the cylinder 8. The rear end of the lead screw 7 is connected to an output shaft 28 disposed at the front end of the motor 17 via a flat key 9. A bearing 14 is fitted on the outer side of the lead screw 7. A bearing seat 16 is rotatably connected to one end of the bearing 14 facing the motor 17.

[0024] Both the output shaft 28 and the lead screw 7 have keyways, which are then used in conjunction with the flat key 9 to ensure the connection between the lead screw 7 and the output shaft 28.

[0025] The bearing 14 is fixed by the locking nut 15, and its front end is locked and positioned by the snap ring 13. The front end of the lead screw 7 is provided with a push rod 1, and the push rod 1 has a shaft hole. One end of the lead screw 7 extends into the shaft hole with a gap distribution. The lead screw 7 is threadedly connected to the lead screw nut 27. The lead screw nut 27 is connected to the outside of the lead screw nut 27 by a flat key 9. The flat key 9 is positioned by the screw 29 and the locking block 10 to prevent it from loosening and ensure smooth transmission. The front end of the lead screw nut guide seat 11 is locked to the tail end of the push rod 1 by the screw 26. At the same time, an anti-rotation guide mechanism is provided on the outside of the lead screw nut 27 to guide the linear movement of the lead screw nut 27. The lead screw nut 27 and the lead screw 7 are threadedly engaged and rotate at the same time. That is, when the motor 17 starts, the control output shaft 28 drives the lead screw 7 to rotate. At this time, the lead screw nut 7 synchronously drives the lead screw nut guide seat 11 to reciprocate linearly along the lead screw 7, thereby driving the push rod 1 to reciprocate telescopic movement.

[0026] Specifically, a set of support seats 6 is movably provided on the outer side of the push rod 1, and the push rod 1 moves through the support seats 6 to extend and retract.

[0027] In one embodiment of the present invention, the anti-rotation guide mechanism includes two grooves formed at the diagonal corners of the bottom side of the lead screw nut guide seat 11. A guide sleeve 22 is embedded in the grooves, and a guide rod 20 passes through the inside of the guide sleeve 22. That is, the guide rod 20 passes through the guide sleeve 22, and the end of the guide rod 20 facing the inside of the guide sleeve 22 is fixed on the bearing seat 16. The other end of the guide rod 20 is fixed inside the support seat 6, and a precision fit is made. The guide rod 20 is fixed on the lead screw nut guide seat 11 through the guide sleeve 22 to prevent the lead screw nut 27 from rotating when it is moving in a straight line, that is, to play the function of guiding and anti-rotation.

[0028] When the guide sleeve 22 is inserted into the groove, a washer 21 is fitted on the outer side for compression to increase the stability of the connection.

[0029] The front end of the support base 6 is provided with a bushing 5 for supporting the push rod 1. At the same time, a scraper 3 is provided on the outside of the push rod to remove impurities encountered by the push rod 1 during operation. A sealing ring 4 is provided inside the telescopic connection between the push rod 1 and the support base 6 to prevent impurities from entering the interior and affecting the operation of the motor.

[0030] A buffer pad 12 is placed between the bearing housing 16 and the lead screw nut guide seat 11 to buffer the impact force generated when the push rod 1 reciprocates.

[0031] In a preferred embodiment of the present invention, the lead screw nut guide seat 11 and the cylinder 8 are provided with inlets on both sides. An oil nozzle 25 is installed on the inlet on the upper side of the lead screw nut 27 to perform oiling and maintenance on the lead screw 7. The cylinder 8 is wrapped with a dust cover 18 to prevent impurities from entering the cylinder 8 and affecting the motor performance.

[0032] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A direct-coupled servo motor for resistance spot welding, characterized by, The application relates to a push rod driving device, which comprises a motor (17), a supporting base (6), a cylinder (8) and a bearing base (16), the cylinder (8) being arranged between the supporting base (6) and the bearing base (16); a power actuator, which comprises a lead screw (7) arranged in the cylinder (8), the rear end of the lead screw (7) being connected with the output shaft (28) of the motor (17) through a flat key (9), the outer side of the lead screw (7) being sleeved with a bearing (14), and the end of the bearing (14) towards the motor being rotationally connected with the bearing base (16); a push rod (1), the front end of the push rod (1) being movably arranged through the supporting base (6), the tail end of the push rod (1) being connected with a lead screw nut (27) through a lead screw nut guide seat (11), and the lead screw nut (27) being threadedly matched with the lead screw (7); and an anti-rotation guide mechanism, which is arranged on the outer side of the lead screw nut guide seat (11) and is used for restraining the linear motion of the lead screw nut (27) and preventing the rotation of the lead screw nut (27). The anti-rotation guide mechanism comprises two guide rods (20), one end of the guide rod (20) being fixed to the bearing base (16), and the other end of the guide rod (20) being fixed to the inside of the supporting base (6); a guide shaft sleeve (22) being embedded into a recess at the opposite corner of the bottom of the lead screw nut guide seat (11), the guide rod (20) penetrating through the guide shaft sleeve (22), and the guide rod (20) being precisely matched with the guide shaft sleeve (22). The connecting position of the guide shaft sleeve (22) and the recess is sleeved with a gasket (21) and is fixed through pressing. The lead screw nut guide seat (11) is connected with the lead screw nut (27) through the flat key (9), and the flat key (9) is fixed through a locking pressing block (10) and a screw (29). The tail end of the push rod (1) is internally provided with an axle hole, and the front end of the lead screw (7) extends into the axle hole and is distributed in gaps.

2. The direct drive servo motor of claim 1, wherein The front end of the supporting base (6) is provided with an axle sleeve (5) for supporting the push rod (1), and the outer side of the push rod (1) is provided with a shaving device (3) and a sealing ring (4). The bearing (14) is fixed through a locking nut (15), and the front end of the bearing (14) is clamped and positioned through a clamping spring (13).

3. The direct drive servo motor of claim 2, wherein The bearing base (16) and the lead screw nut guide seat (11) are provided with a buffer pad (12) therebetween.

4. The direct-connect servo motor of claim 1, wherein The two sides of the lead screw nut guide seat (11) and the cylinder (8) are provided with oil nozzles (25), and the outer side of the cylinder (8) is wrapped with a dustproof cover plate (18).

5. The direct-connect servo motor of claim 1, wherein The key groove of the output shaft (28) and the flat key (9) are matched to realize torque transmission.

6. The direct-connect servo motor of claim 1, wherein ​ 7. The direct drive servomotor of claim 1, wherein ​ 8. The direct drive servomotor of claim 1, wherein ​ 9. The direct drive servomotor of claim 1, wherein ​ 10. The direct drive servomotor of claim 1, wherein ​

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