Resistance spot welding electrode driving electric cylinder

Abstract

The utility model relates to a resistance spot welding electrode driving electric cylinder which comprises a transmission case, and a servo motor and a cylinder barrel are arranged on the top of the transmission case. A transmission shaft of the servo motor penetrates through the top of the transmission box to be connected with a driving wheel in the transmission box, a driven wheel is arranged in the transmission box, and the driven wheel and the driving wheel are in transmission connection through a synchronous belt. A vertically-communicated moving chamber is arranged in the cylinder barrel, a ball screw is arranged in the center of the moving chamber and fixedly connected with a driven wheel, and a servo motor can drive the ball screw to rotate synchronously through a synchronous belt. A ball nut is arranged outside the ball screw, and a push rod matched with the ball nut in a sleeving mode is arranged outside the ball nut. According to the resistance spot welding electrode driving electric cylinder, the accuracy and stability of linear motion of the push rod are guaranteed, the welding precision of a weldment is guaranteed, the welding quality of a product is improved, maintenance is convenient, and adaptability is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to resistance spot welding processing field especially relates to a resistance spot welding electrode drive electric cylinder. BACKGROUND

[0002] Resistance welding is that workpieces are combined and pressure is applied through electrodes, and workpieces are heated to molten or plastic state by resistance heat effect generated by current flowing through workpiece contact surface and adjacent area, so that metal combination is formed to carry out welding.

[0003] In the field of automobile plate parts, aerospace, shipbuilding, there are more metal sheets that need to be welded, and resistance welding is mainly used in these fields for sheet part welding. Spot welding is a resistance welding method that assembles the welding parts into a lap joint and presses them between two cylindrical electrodes, and melts the base metal to form a welding spot. In order to facilitate the pressure between the two cylindrical electrodes and achieve distance adjustment, a cylinder is usually used as an electrode pressure driving device in resistance spot welding. The two electrodes are symmetrically arranged, one of which is fixed in position, and the other is fixedly connected with the piston rod end of the cylinder. The electrode connected with the cylinder can adjust the distance between the two electrodes, facilitate the clamping of sheet parts by the two electrodes, and facilitate the disassembly of sheet parts after separation.

[0004] However, the cylinder has a delay in output, and when used in resistance spot welding, the cylinder can easily produce a large impact force when contacting the sheet parts, resulting in low welding precision and poor welding quality. SUMMARY

[0005] The utility model solves the technical problem that a resistance spot welding electrode driving cylinder with simple structure, convenient maintenance and the ability to ensure the repeated positioning accuracy of the push rod is provided.

[0006] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0007] The utility model provides a resistance spot welding electrode drive electric cylinder, including transmission case, the top of transmission case is provided with servo motor and cylinder, servo motor and cylinder are side by side and set up, the transmission shaft of servo motor passes through the top of transmission case and is fixedly connected together with the drive wheel that sets up in transmission case, the drive wheel is horizontally arranged, the position that corresponds the bottom of cylinder in transmission case is provided with the driven wheel, the driven wheel is horizontally arranged, and it is with the left and right correspondence of drive wheel and drive wheel is at the same horizontal height, and is driven together through synchronous belt transmission between them, the inside of cylinder is provided with the movable chamber that is connected together up and down, the bottom of movable chamber is provided with the bearing seat that is fixedly connected with cylinder, and the bearing seat is fixed with the bearing that is horizontally arranged in, the center of bearing corresponds up and down with the center of driven wheel, the movable chamber center is provided with ball screw along its height direction, the lower end of ball screw passes through the axle hole of bearing and is fixedly connected together with driven wheel, and servo motor can drive ball screw synchronous rotation through synchronous belt, the outside of ball screw is provided with ball nut that is screwed with it, and ball nut can make the linear motion up or down along the height direction of ball screw when ball screw rotates, the outside of ball nut is provided with push rod that is sleeved with it, and the outside of push rod is provided with guide seat that is sleeved with it up and down, and the guide seat is sleeved and cooperates in the top opening of movable chamber, the top of guide seat is provided with guide support block, the guide support block is sleeved in the outside of push rod, and the push rod and guide support block slide together up and down, the guide support block is fixedly connected together with guide seat and cylinder, the outside of guide support block is provided with guide seat cover plate that is sleeved with it, and guide seat cover plate is sleeved in the outside of push rod and slides together up and down with push rod.

[0008] Further, the ball screw is provided with a limiting nut screwed with it on both sides of the bearing; and a spacer is arranged between the driven wheel and the corresponding limiting nut on the ball screw.

[0009] Further, the bottom center of the push rod is provided with a nut engaging hole, and the top center is provided with a screw rod engaging hole in communication with the nut engaging hole; the nut engaging hole is sleeved with the ball nut, and the screw rod engaging hole has a diameter larger than that of the ball screw.

[0010] Further, the top of the push rod is provided with a connector fixedly connected thereto, and the lower end of the connector is threadedly connected with the upper end of the screw rod engaging hole.

[0011] Further, a copper sleeve is arranged between the guide seat and the push rod, the copper sleeve is sleeved on the outside of the push rod and slides up and down with the push rod, and the copper sleeve is fixed in the guide seat through the guide support block fixed on the top of the guide seat.

[0012] Further, the center of the guiding seat cover plate and the guiding support block is provided with a guiding connection hole communicating with the upper and lower parts, and the push rod sleeve is connected with the guiding connection hole.

[0013] Further, the part close to the upper end of the guiding connection hole is provided with a dustproof sealing ring connected with the push rod sleeve.

[0014] Further, the side of the push rod is provided with a planar limiting surface along the height direction, the cross section of the limiting surface is a "D" shape structure, and the end surface of the guiding connection hole is a "D" shape structure matched with the cross section structure of the push rod.

[0015] Compared with the prior art, the electric resistance spot welding electrode driving electric cylinder drives the ball screw to rotate through the servo motor, the ball screw drives the push rod connected with the ball nut to move up and down, the accuracy and stability of the linear motion of the push rod are ensured, the electrode does not generate impact force on the welding piece, the welding precision of the welding piece is ensured, the welding quality and quality of the product are improved, the structure is simple, convenient to maintain, and has strong adaptability, and is convenient for promotion. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can be obtained without the creative labor on the premise of the drawings.

[0017] Figure 1 It is a three-dimensional structure schematic view of the electric resistance spot welding electrode driving electric cylinder of the utility model;

[0018] Figure 2 It is a side structure sectional view of the electric resistance spot welding electrode driving electric cylinder of the utility model.

[0019] In the drawing: 1, transmission box;2, servo motor;21, transmission shaft;22, driving wheel;23, driven wheel;24, synchronous belt;3, cylinder;31, movable chamber;4, guiding seat cover plate;41, guiding connection hole;42, dustproof sealing ring;5, guiding seat;51, guiding support block;52, copper sleeve;6, push rod;61, limiting surface;62, nut connection hole;63, screw connection hole;7, joint;8, ball screw;81, ball nut;9, bearing seat;91, bearing;92, limiting nut;93, cushion block. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application. It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present application, it should be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the terms "horizontal", "vertical" and the like appear, they do not mean that the component must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure or component must be completely horizontal, but can be slightly inclined.

[0023] In the description of the embodiments of the present application, "a plurality of" represents at least 2.

[0024] In the description of the embodiments of the present application, it should also be explained that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connected", "connected" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Embodiments:

[0026] Please refer to the drawings shown in the description Figure 1 and 2 shown in the description Figure 1 and 2The utility model discloses a resistance spot welding electrode drive electric jar for the control of electrode and welding position in resistance spot welding machine, the resistance spot welding electrode drive electric jar in the embodiment includes transmission case 1, is provided with the cavity in transmission case 1, is provided with the cover plate on the bottom, the cover plate is fixedly connected on the bottom of transmission case 1 through bolt, the cavity in transmission case 1 is closed, the cover plate is also convenient to open, and the inside parts of transmission case 1 are maintained conveniently, the transmission case 1 top near the parts of left and right sides are provided with the transmission connecting hole that communicates up and down respectively, the transmission case 1 top is provided with servo motor 2 and cylinder 3, servo motor 2 and cylinder 3 are provided at two transmission connecting holes of transmission case 1 top respectively, servo motor 2 and cylinder 3 are arranged side by side, and servo motor 2 and cylinder 3 are fixedly connected together through bolt and transmission case 1, and are convenient to dismount, the transmission shaft 21 of servo motor 2 goes down and passes through corresponding transmission connecting hole and extends into the cavity of transmission case 1, the position below servo motor 2 in transmission case 1 is provided with driving wheel 22, driving wheel 22 is horizontally arranged, the transmission shaft 21 of servo motor 2 passes through the top of transmission case 1 and is fixedly connected together with driving wheel 22 arranged in transmission case 1, servo motor 2 can drive driving wheel 22 to rotate or overturn, the position corresponding cylinder 3 bottom in transmission case 1 is provided with driven wheel 23, driven wheel 23 is also horizontally arranged, and driven wheel 23 and driving wheel 22 correspond left and right simultaneously, and driving wheel 22 and driven wheel 23 are at the same horizontal height, and are drivenly connected through synchronous belt 24, it needs to be explained that, driving wheel 22 and driven wheel 23 are all toothed synchronous wheels, correspondingly, synchronous belt 24 is the toothed synchronous belt that cooperates with the toothed synchronous wheel, the toothed synchronous wheel and toothed synchronous belt can avoid the phenomenon that synchronous belt and synchronous wheel slip in the transmission process, guarantee the stability of transmission, cylinder 3 is cylindrical cylinder, and is provided with movable chamber 31 that communicates up and down in the inside, movable chamber 31 and transmission connecting hole on transmission case 1 top drink cylinder 3 bottom communicate up and down, the bottom of movable chamber 31 is provided with bearing seat 9 fixedly connected with cylinder 3, bearing seat 9 is fixedly provided with horizontally arranged bearing 91, bearing 91 has two, and is arranged side by side up and down in bearing seat 9, the center of bearing 91 corresponds with the center of driven wheel 23 up and down, movable chamber 31 center is provided with ball screw 8 along its height direction, the height of ball screw 8 is slightly higher than the height of cylinder 3, the lower end of ball screw 8 passes through the shaft hole of bearing 91 and is fixedly connected together with driven wheel 23, servo motor 2 can drive ball screw 8 synchronous rotation through synchronous belt 24,Two bearings 91 ensure the stability of the ball screw 8 during radial rotation. To ensure the stability of the ball screw 8 connected to the bearing housing 9, a limiting nut 92 is provided at each of the upper and lower ends of the ball screw 8, located at the upper and lower ends of the two bearings 91. The limiting nuts 92 are threadedly connected to the ball screw 8. It should be noted that the ball screw 8 has an external thread from the top of the bearing housing to the lower end of the ball screw 8, which facilitates the screwing of the limiting nuts 92. The outer diameter of this external thread is smaller than the outer diameter of the ball screw 8. The diameter of the main body is limited by the upper end of the external thread on the ball screw 8 for screwing the limit nut 92 at the top of the bearing 91. In order to limit the limit nut 92 below the bearing 91, a pad 93 is provided on the ball screw 8 between the driven wheel 23 and the corresponding limit nut 92. The pad 93 is sleeved on the outside of the ball screw 8 and can limit the position of the limit nut 92 below the bearing 91. The upper and lower limit nuts 92 limit the height position of the two bearings 91; see the appendix of the instruction manual. Figure 2As shown, the outer part of the ball screw 8 is provided with a ball nut 81 matched with the thread of the ball screw 8, when the ball screw 8 rotates (forward or reverse), the ball nut 81 can move up or down along the height direction of the ball screw 8; the outer part of the ball nut 81 is provided with a push rod 6 matched with the sleeve, the bottom center of the push rod 6 is provided with a nut connection hole 62, and the top center is provided with a screw rod connection hole 63 communicated with the nut connection hole 62; it should be noted that the nut connection hole 62 is matched with the ball nut 81, and the push rod 6 can follow the ball nut 81 to move up and down on the ball screw 8, the diameter of the screw rod connection hole 63 is larger than that of the ball screw 8, and the screw rod connection hole 63 ensures that the upper end of the ball screw 8 can enter the screw rod connection hole 63 in the push rod 6 when the push rod 6 moves downward with the ball nut 81, without interfering with the downward movement of the push rod 6, the top of the push rod 6 is provided with a connector 7 fixedly connected therewith, the connector 7 is provided with an electrode assembly connected with the resistance spot welding, the lower end of the connector 7 is threadedly connected with the upper end of the screw rod connection hole 63, and the connector 7 can move up and down synchronously with the push rod 6; in order to ensure the stability and position accuracy of the upward and downward movement of the push rod 6, the outer part of the push rod 6 is provided with a guide seat 5 matched with the sleeve, the guide seat 5 is matched with the top opening of the movable chamber 31; a copper sleeve 52 is arranged between the guide seat 5 and the push rod 6, the copper sleeve 52 is matched with the outer part of the push rod 6, and the copper sleeve 52 is matched with the push rod 6 in sliding mode, the copper sleeve 52 ensures the wear resistance and good sliding fit between the copper sleeve 52 and the push rod 6, the guide seat 5 is provided with a guide support block 51, the guide support block 51 is matched with the outer part of the push rod 6, the push rod 6 is matched with the guide support block 51 in sliding mode, and the copper sleeve 52 is fixed in the guide seat 5 through the guide support block 51 fixed on the top of the guide seat 5; it should be noted that in order to facilitate the stability of the connection of the guide support block 51 and the guide seat 5 on the cylinder 3, the guide support block 51, the guide seat 5 and the cylinder 3 are fixedly connected together, the guide support block 51, the guide seat 5 and the cylinder 3 are provided with threaded connection holes communicated in the up and down directions, the guide support block 51, the guide seat 5 and the cylinder 3 are fixedly connected together through bolts penetrating the threaded connection holes, the outer part of the guide support block 51 is provided with a guide seat cover plate 4, the center of the guide seat cover plate 4 and the guide support block 51 is provided with a guide connection hole 41 communicated in the up and down directions, the push rod 6 is matched with the guide connection hole 41, in order to avoid the radial rotation of the push rod 6, the side surface of the push rod 6 is provided with a planar limiting surface 61 along the height direction, the cross section of the push rod 6 is in "D" shape structure, the end surface of the guide connection hole 41 is in "D" shape structure matched with the cross section structure of the push rod 6, the push rod 6 is matched with the guide connection hole 41 in sliding mode, the radial angle of the push rod 6 can be limited through the limiting surface, and the accuracy and stability of the upward and downward movement chamber are maintained.The guide seat cover plate 4 is sleeved on the push rod 6 and the outside of the guide seat 5 through the guide hole, in order to ensure the sealing property, prevent dust from entering the movable chamber 31, and facilitate pushing away the dust adhered to the outside of the push rod 6 when the push rod 6 moves up and down. A dustproof sealing ring 42 sleeved and matched with the push rod 6 is arranged at the position close to the upper end in the guide link hole 41, the dustproof sealing ring 41 has good sealing property, can block the oil dust from entering the movable chamber 31, and can also scrape off the dust and oil adhered to the outside of the push rod 6.

[0027] One of the electrodes for resistance spot welding is fixedly installed on the top of the joint 7, when working, the servo motor 2 drives the ball screw 8 to rotate synchronously through the synchronous belt 24, the ball screw 8 drives the ball nut 81 matched with the ball screw 8 to move upwards or downwards according to the forward rotation or reverse rotation of the servo motor 2, the push rod 6 can move upwards or downwards synchronously with the ball nut 81, and then drives the electrode installed on the top of the joint 7 to move synchronously, so that the position of the electrode is adjusted conveniently.

[0028] The electrode driving electric cylinder for resistance spot welding is driven to rotate by the servo motor, the push rod connected with the ball nut 81 of the ball screw 8 moves upwards or downwards, the straight-line movement precision and stability of the push rod 6 are ensured, the electrode does not generate impact force on the welding piece, the welding precision of the welding piece is ensured, the welding quality and quality of the product are improved, the structure is simple, maintenance is convenient, and the adaptability is high, so the electrode driving electric cylinder for resistance spot welding is convenient to popularize.

[0029] It should be emphasized that: the above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A resistance spot welding electrode drive cylinder characterized by: The utility model provides a kind of transmission box (1), the transmission box (1) top is provided with servo motor (2) and cylinder barrel (3), the servo motor (2) and cylinder barrel (3) are arranged side by side;The transmission shaft (21) of servo motor (2) passes through the top of transmission box (1) and is fixedly connected with driving wheel (22) arranged in transmission box (1), the driving wheel (22) is horizontally arranged, the position corresponding the bottom of cylinder barrel (3) in transmission box (1) is provided with driven wheel (23), the driven wheel (23) is horizontally arranged, it is left and right corresponding with driving wheel (22) and driving wheel (22) and driven wheel (23) are at the same horizontal height, between by synchronous belt (24) transmission connection;The inside of cylinder barrel (3) is provided with the movable chamber (31) that communicates up and down, the bottom of movable chamber (31) is provided with bearing seat (9) fixedly connected with cylinder barrel (3), bearing seat (9) is fixed with horizontally arranged bearing (91) in, the center of bearing (91) is up and down corresponding with the center of driven wheel (23);The movable chamber (31) center is provided with ball screw (8) along its height direction, the lower end of ball screw (8) passes through the shaft hole of bearing (91) and is fixedly connected with driven wheel (23), servo motor (2) can drive ball screw (8) synchronous rotation by synchronous belt (24);The outside of ball screw (8) is provided with ball nut (81) with its thread cooperation, ball nut (81) can move up or down linearly along the height direction of ball screw (8) when ball screw (8) rotates;The outside of ball nut (81) is provided with push rod (6) with its sleeve joint cooperation, the outside of push rod (6) is provided with guide seat (5) with its up and down sleeve joint cooperation, and the guide seat (5) sleeve joint cooperation is in the top opening of movable chamber (31);The top of guide seat (5) is provided with guide support block (51), the guide support block (51) is sleeved on the outside of push rod (6), the push rod (6) and the guide support block (51) are up and down sliding fit, the guide support block (51) is fixedly connected with guide seat (5) and cylinder barrel (3), the outside of guide support block (51) is provided with guide seat cover plate (4) with its sleeve joint cooperation, and guide seat cover plate (4) is sleeved on the outside of push rod (6) and is up and down sliding fit with push rod (6).

2. A resistance spot welding electrode drive cylinder according to claim 1, characterized in that: The part of ball screw (8) on both sides of bearing (91) is provided with limiting nut (92) with its thread cooperation;Ball screw (8) is provided with pad (93) between driven wheel (23) and corresponding limiting nut (92).

3. A resistance spot welding electrode drive cylinder according to claim 1, characterized in that: The bottom center of push rod (6) is provided with nut link hole (62), and the top center is provided with screw rod link hole (63) in communication with nut link hole (62) up and down;Nut link hole (62) is sleeved with ball nut (81), and is closely matched, the diameter of screw rod link hole (63) is greater than the diameter of ball screw (8).

4. A resistance spot welding electrode drive cylinder according to claim 3, characterized in that: The top of the push rod (6) is provided with a joint (7) fixedly connected therewith, and the lower end of the joint (7) is threadedly connected with the upper end of the screw rod engaging hole (63).

5. The resistance spot welding electrode drive cylinder of claim 1, wherein: A copper sleeve (52) is arranged between the guide seat (5) and the push rod (6), the copper sleeve (52) is sleeved on the outside of the push rod (6), and the copper sleeve (52) is fixed in the guide seat (5) through the guide support block (51) fixed on the top of the guide seat (5).

6. A resistance spot welding electrode drive cylinder according to claim 1, characterized in that: The center of the guide seat cover plate (4) and the guide support block (51) is provided with a guide engaging hole (41) in communication with the upper and lower portions, and the push rod (6) is sleeved and fitted in the guide engaging hole (41).

7. A resistance spot welding electrode drive cylinder according to claim 6, characterized in that: The part close to the upper end of the guide engaging hole (41) is provided with a dustproof sealing ring (42) sleeved and fitted with the push rod (6).

8. A resistance spot welding electrode drive cylinder according to claim 6, characterized in that: The side surface of the push rod (6) is provided with a planar limiting surface along the height direction thereof, the cross section of the limiting surface is in a "D" shape structure, and the end surface of the guide engaging hole (41) is in a "D" shape structure consistent with the cross section structure of the push rod (6).

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