Symmetrical thread electric clamping jaw with self-locking function
By designing a symmetrical threaded electric gripper, the problem of insufficient load-bearing capacity caused by the small contact surface in traditional gripper structures is solved, achieving high load-bearing capacity and motion stability, extending equipment life, and ensuring production safety.
Patent Information
- Application Number
- CN202520951198.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-15
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-05-15
AI Technical Summary
Traditional gripper structures have a small contact area between the screw and nut, resulting in insufficient impact resistance. They are prone to generating eccentric torque, causing operational jamming and component wear, which significantly shortens the service life of the equipment.
The electric gripper with a symmetrical thread design includes a sliding gripping assembly and a transmission drive assembly. It uses a bidirectional trapezoidal screw and symmetrically distributed nuts to increase the working contact surface. The gripper is evenly subjected to the pressure of the gripper mounting seat through the cooperation of balls and guide grooves. Combined with belt drive and protective sleeve protection, it ensures smooth movement and self-locking function.
It improves the load-bearing capacity of the electric gripper, avoids the generation of eccentric torque, extends the service life of the equipment, ensures production safety and equipment stability, reduces wear, and improves motion accuracy and stability.
Smart Images
Figure CN223890029U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric gripper technology, specifically to a symmetrical threaded electric gripper with a self-locking function. Background Technology
[0002] An electric gripper is a device that uses electric drive to clamp objects. Power is provided by a motor and converted into the opening and closing motion of the gripper through a reducer and transmission mechanism. It has the advantages of high precision control, high flexibility, and fast response. It can achieve controllable speed, controllable stroke, and controllable clamping force, which can effectively improve production efficiency and automation level.
[0003] Because traditional gripper structures have a small contact area between the screw and nut during operation, they are not able to withstand impact forces. This structural defect makes the gripper prone to generating eccentric torque during movement, which can lead to operation jamming, accelerated component wear, and significantly shorten the service life of the equipment. Therefore, a symmetrical threaded electric gripper with self-locking function is proposed to address the above problems. Utility Model Content
[0004] The purpose of this invention is to provide a symmetrical threaded electric gripper with a self-locking function to solve the problem that the traditional gripper structure has insufficient impact resistance due to the small contact area between the screw and nut during operation. This structural defect makes the gripper prone to generating eccentric torque during movement, which in turn causes operation to stall, accelerates component wear, and significantly shortens the service life of the equipment.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A symmetrical threaded electric gripper with self-locking function includes a housing, a sliding gripping assembly mounted on the top of the housing, and a transmission drive assembly installed inside the housing. The sliding gripping assembly includes a protective plate, with gripper mounting seats slidably connected to both sides of the upper surface of the protective plate. Protective sleeves are fixedly connected to both ends of the gripper mounting seats. Guide grooves are formed on both sides of the outer wall of the gripper mounting seats, and ball bearings are installed inside the guide grooves. A left-hand helical nut and a right-hand helical nut are fixedly connected to the bottom ends of the two gripper mounting seats, respectively. Guide rails are embedded on both sides of the top of the housing, and a mating groove for the ball bearings is formed on the side of the guide rails near the gripper mounting seats. The transmission drive assembly includes two bearing seats, which are fixedly mounted on the top of the inner wall of the housing. A bidirectional trapezoidal screw is rotatably connected between the two bearing seats through bearings. The bidirectional trapezoidal screw extends to the outside of the bearing seats, and a driven pulley is fixedly connected to one end of the bidirectional trapezoidal screw. The two sides of the bidirectional trapezoidal screw are threadedly connected to the left-hand helical nut and the right-hand helical nut, respectively.
[0007] As a further optimization of this utility model, a drive motor is fixedly connected to the bottom of the inner side of the housing via a motor mount. The drive motor's transmission shaft is fixedly connected to a drive pulley, which is located below the driven pulley. A transmission belt connects the drive pulley and the driven pulley.
[0008] As a further optimization of this utility model, the gripper mounting base and the protective sleeve are parallel to each other, the gripper mounting base is located between two guide rails, and the two gripper mounting bases are symmetrically distributed.
[0009] As a further optimization of this utility model, the number of the balls is set to multiple, the multiple balls are linearly distributed, the balls are slidably disposed between the mating groove and the guide groove, and the central axis of the mating groove coincides with the central axis of the guide groove.
[0010] As a further optimization of this utility model, the left-hand spiral nut and the right-hand spiral nut are symmetrically distributed, and the left-hand spiral nut and the right-hand spiral nut have the same shape.
[0011] As a further optimization of this utility model, both ends of the outer shell are fixedly connected to end caps by bolts, and the top of the inner side of the outer shell is provided with a mounting groove for mounting guide rails.
[0012] As a further optimization of this utility model, the protective plate is fixedly installed on the top of the outer shell, the protective plate is parallel to the two guide rails, and the two sides of the middle part of the protective plate are provided with sliding grooves, the inner sides of the two sliding grooves are slidably connected to the outer sides of the left spiral nut and the right spiral nut, respectively.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. By using the sliding clamping assembly and transmission drive assembly, and with the cooperation of the bidirectional trapezoidal screw and the symmetrically distributed left and right helical nuts, the working contact surface is increased, enabling the electric gripper to withstand large impact forces during clamping and acceleration. The cooperation of the balls, guide grooves, and mating grooves evenly distributes the pressure of the gripper mounting seat, avoids the generation of eccentric torque, ensures smooth movement, and extends the service life of the components;
[0015] 2. By using belt drive, the impact of drive motor vibration on the gripper structure is reduced. The protective sleeve protects the gripper mounting base from collision and wear. The protective plate cooperates with the guide rail and combined with the slide groove design to further improve motion accuracy and stability. The self-locking of the bidirectional trapezoidal screw and the left and right helical nuts ensures that the workpiece will not fall off when the equipment is powered off, thus ensuring production safety, equipment stability and personnel health. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0017] Figure 2 This is a cross-sectional structural diagram of the entire utility model;
[0018] Figure 3 A schematic diagram of the structure of the sliding clamping assembly of this utility model;
[0019] Figure 4 This is a schematic diagram of the structure of the gripper mounting base of this utility model;
[0020] Figure 5 This is a schematic diagram of the transmission drive assembly of this utility model;
[0021] Figure 6 This is a schematic diagram of the transmission belt structure of this utility model.
[0022] In the picture: 1. Outer shell;
[0023] 2. Sliding clamping assembly; 21. Protective plate; 22. Gripper mounting base; 23. Protective sleeve; 24. Guide groove; 25. Ball bearing; 26. Left helical nut; 27. Right helical nut; 28. Guide rail; 29. Mating groove;
[0024] 3. Transmission drive assembly; 31. Bearing housing; 32. Double-direction trapezoidal screw; 33. Driven pulley; 34. Drive motor; 35. Drive pulley; 36. Transmission belt;
[0025] 4. End cap; 5. Mounting groove; 6. Slide groove. Detailed Implementation
[0026] 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.
[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0028] Please see Figure 1-6 This utility model provides a technical solution:
[0029] A symmetrical threaded electric gripper with self-locking function includes a housing 1, a sliding gripping assembly 2 mounted on the top of the housing 1, a transmission drive assembly 3 installed inside the housing 1, and end caps 4 bolted to both ends of the housing 1. The sliding gripping assembly 2 includes a protective plate 21 to prevent foreign objects from entering the housing 1. Gripper mounting seats 22 are slidably connected to both sides of the upper surface of the protective plate 21. Protective sleeves 23 are fixedly connected to both ends of the gripper mounting seats 22. Guide grooves 24 are formed on both sides of the outer wall of the gripper mounting seats 22. Ball bearings 25 are installed inside the guide grooves 24. A left-hand spiral nut 26 and a right-hand spiral nut 27 are fixedly connected to the bottom ends of the two gripper mounting seats 22, respectively. The top of the outer casing 1 is provided with guide rails 28 on both sides. The top of the inner side of the outer casing 1 is provided with a mounting groove 5 for mounting the guide rails 28. The guide rail 28 is provided with a mating groove 29 that matches the ball 25 on the side near the gripper mounting seat 22. The transmission drive assembly 3 includes two bearing seats 31. The two bearing seats 31 are fixedly installed on the top of the inner wall of the outer casing 1. A bidirectional trapezoidal screw 32 is rotatably connected between the two bearing seats 31 through a bearing. The bidirectional trapezoidal screw 32 extends to the outside of the bearing seats 31. A driven pulley 33 is fixedly connected to one end of the bidirectional trapezoidal screw 32. The two sides of the bidirectional trapezoidal screw 32 are threadedly connected to a left helical nut 26 and a right helical nut 27, respectively.
[0030] As a further implementation of this solution, a drive motor 34 is fixedly connected to the bottom of the inner side of the housing 1 via a motor mount. The drive shaft of the drive motor 34 is fixedly connected to a drive pulley 35, which is located below the driven pulley 33. A drive belt 36 is connected between the drive pulley 35 and the driven pulley 33. This design utilizes the advantages of the drive belt 36, which has a buffering and vibration absorption function. This can reduce the impact of vibrations generated during the start-up and operation of the drive motor 34 on the entire gripper structure, ensuring the stability of the gripper's operation. At the same time, the belt drive can achieve long-distance power transmission, making the position of the drive motor 34 more flexible and reducing the space occupied.
[0031] As a further implementation of this solution, the gripper mounting base 22 and the protective sleeve 23 are parallel to each other. The gripper mounting base 22 is located between two guide rails 28, and the two gripper mounting bases 22 are symmetrically distributed. This layout makes the gripper more evenly stressed when gripping the workpiece. The gripper mounting bases 22 on the left and right sides can move synchronously and symmetrically, thereby improving the gripping accuracy and stability. The protective sleeve 23 prevents the ball 25 from sliding out of the gripper mounting base 22 and ensures that the ball 25 slides back and forth within the gripper mounting base 22. The guide rails 28 provide precise guidance for the sliding of the gripper mounting base 22, ensuring that the gripper mounting base 22 moves along the predetermined trajectory without generating eccentric torque, and the movement is smooth, ensuring the accuracy of the gripping action.
[0032] As a further implementation of this solution, multiple balls 25 are arranged linearly and slide between the mating groove 29 and the guide groove 24. The central axis of the mating groove 29 coincides with the central axis of the guide groove 24. This linearly distributed arrangement of multiple balls 25 can evenly bear the pressure of the gripper mounting seat 22, improving the stability and reliability of the gripper mounting seat 22's movement. At the same time, the alignment of the central axes of the mating groove 29 and the guide groove 24 ensures the smoothness of the balls 25 during rolling, avoiding jamming, preventing eccentric torque, ensuring smooth movement, and extending service life.
[0033] As a further implementation of this solution, the left helical nut 26 and the right helical nut 27 are symmetrically distributed and have the same shape. The symmetrical distribution design allows the bidirectional trapezoidal screw 32 to drive the left helical nut 26 and the right helical nut 27 to move relative to each other or in opposite directions simultaneously and equally when rotating. The symmetrically distributed left helical nuts 26 and the right helical nuts 27 have a large working contact surface with the bidirectional trapezoidal screw 32, which can withstand large impact forces when the electric gripper clamps the workpiece and accelerates the movement.
[0034] As a further implementation of this solution, the protective plate 21 is fixedly installed on the top of the outer shell 1. The protective plate 21 and the two guide rails 28 are parallel to each other. The two sides of the middle part of the protective plate 21 are provided with sliding grooves 6. The inner side of the two sliding grooves 6 is slidably connected to the outer side of the left spiral nut 26 and the outer side of the right spiral nut 27, respectively. The parallel protective plate 21 and guide rails 28 ensure the stability of the gripper mounting base 22 during the sliding process. The protective plate 21 can prevent foreign objects from entering the interior of the outer shell 1. The sliding grooves 6 reserve space for the movement of the left spiral nut 26 and the right spiral nut 27.
[0035] Workflow: When a workpiece needs to be clamped, the drive motor 34 starts, and the drive shaft of the drive motor 34 drives the drive pulley 35 to rotate. The drive pulley 35 drives the driven pulley 33 to rotate via the transmission belt 36. Since the driven pulley 33 is fixed to one end of the bidirectional trapezoidal screw 32, the bidirectional trapezoidal screw 32 rotates accordingly. The threads on both sides of the bidirectional trapezoidal screw 32 engage with the left helical nut 26 and the right helical nut 27, respectively. When the bidirectional trapezoidal screw 32 rotates, the left helical nut 26 and the right helical nut 27 move relative to each other along the axial direction of the bidirectional trapezoidal screw 32. Because the left helical nut 26 and the right helical nut 27 are fixed to the bottom of the gripper mounting base 22, the gripper mounting base 22 slides towards the center on the upper surface of the protective plate 21, causing the protective sleeve 23 and the gripper mounting base 22 to move together, thereby bringing the two gripper mounting bases 22 closer together to clamp the workpiece. During this process, multiple balls 25 slide between the guide groove 24 and the mating groove 29, playing a guiding and stabilizing role. The use of the double-sided trapezoidal screw 32 ensures the smooth movement of the gripper mounting base 22. At the same time, the outer sides of the left helical nut 26 and the right helical nut 27 slide within the grooves 6 opened on both sides of the middle of the protective plate 21, further improving the stability of the movement. After the workpiece is gripped, the motor drive motor 34 stops rotating. Due to the self-locking function between the double-sided trapezoidal screw 32 and the left helical nut 26 and the right helical nut 27, the electric gripper can maintain the clamping force on the workpiece, ensuring that the workpiece will not fall off. Even in the event of a power outage or other emergencies, the safety of the workpiece, equipment and personnel can be guaranteed. When it is necessary to release the workpiece, the drive motor 34 starts in reverse, driving the drive pulley 35 to rotate in reverse. Through the transmission belt 36, the driven pulley 33 rotates in reverse, which in turn causes the double-sided trapezoidal screw 32 to rotate in reverse. Under the drive of the double-sided trapezoidal screw 32, the left helical nut 26 and the right helical nut 27 move in opposite directions along the axial direction. The gripper mounting base 22 slides to both sides on the upper surface of the protective plate 21, causing the two gripper mounting bases 22 to gradually move away from each other, releasing the grip on the workpiece.
[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A symmetrical threaded electric gripper with self-locking function, comprising a housing (1), characterized in that: A sliding clamping assembly (2) is installed on the top of the outer shell (1), and a transmission drive assembly (3) is installed inside the outer shell (1). The sliding clamping assembly (2) includes a protective plate (21). Both sides of the upper surface of the protective plate (21) are slidably connected to a claw mounting seat (22). Both ends of the claw mounting seat (22) are fixedly connected to a guide rail (28). Both sides of the outer wall of the claw mounting seat (22) are provided with guide grooves (24). A ball (25) is installed on the inner side of the guide groove (24). The bottom ends of the two claw mounting seats (22) are respectively fixedly connected to a left helical nut (26) and a right helical nut (27). Both sides of the top of the outer shell (1) are embedded with guide rails (28). The guide rail (28) near the claw mounting seat (22) is provided with a mating groove (29) that matches the ball (25). The transmission drive assembly (3) includes two bearing seats (31), which are fixedly installed on the top of the inner wall of the outer shell (1). A bidirectional trapezoidal screw (32) is rotatably connected between the two bearing seats (31) through a bearing. The bidirectional trapezoidal screw (32) extends to the outside of the bearing seat (31), and a driven pulley (33) is fixedly connected to one end of the bidirectional trapezoidal screw (32). The two sides of the bidirectional trapezoidal screw (32) are threadedly connected to the left spiral nut (26) and the right spiral nut (27) respectively.
2. The symmetrical threaded electric gripper with self-locking function according to claim 1, characterized in that: The bottom of the inner side of the outer casing (1) is fixedly connected to a drive motor (34) via a motor mount. The drive shaft of the drive motor (34) is fixedly connected to a drive pulley (35). The drive pulley (35) is located below the driven pulley (33). A drive belt (36) is connected between the drive pulley (35) and the driven pulley (33).
3. The symmetrical threaded electric gripper with self-locking function according to claim 1, characterized in that: The gripper mounting base (22) is parallel to the guide rail (28), and the gripper mounting base (22) is located between the two guide rails (28). The two gripper mounting bases (22) are symmetrically distributed.
4. The symmetrical threaded electric gripper with self-locking function according to claim 1, characterized in that: The number of the ball bearings (25) is set to be multiple, and the multiple ball bearings (25) are linearly distributed. The ball bearings (25) are slidably disposed between the mating groove (29) and the guide groove (24). The central axis of the mating groove (29) coincides with the central axis of the guide groove (24).
5. The symmetrical threaded electric gripper with self-locking function according to claim 1, characterized in that: The left spiral nut (26) and the right spiral nut (27) are symmetrically distributed, and the left spiral nut (26) and the right spiral nut (27) have the same shape.
6. The symmetrical threaded electric gripper with self-locking function according to claim 1, characterized in that: Both ends of the outer shell (1) are fixedly connected to end caps (4) by bolts, and the top of the inner side of the outer shell (1) is provided with a mounting groove (5) for mounting guide rails (28).
7. The symmetrical threaded electric gripper with self-locking function according to claim 1, characterized in that: The protective plate (21) is fixedly installed on the top of the outer shell (1). The protective plate (21) is parallel to the two guide rails (28). Slide grooves (6) are provided on both sides of the middle part of the protective plate (21). The inner sides of the two slide grooves (6) are slidably connected to the outer side of the left spiral nut (26) and the outer side of the right spiral nut (27), respectively.