A power driven quick connector for excavators

Abstract

The utility model provides a kind of quick connector of electric drive for excavator, including connector main body and drive locking mechanism. Connector main body contains two mounting plates and front and rear rib plate, and the bottom of rear end is equipped with bayonet. Drive locking mechanism is with double-shaft motor as core, and by the independent control of front and rear threaded rods, the independent movement of movable lock and wedge block assembly is enabled, and the front and rear end pins of tool are locked or released respectively. The connector has the following advantages: electric drive is adopted, complex hydraulic system is abandoned, installation time is shortened, use cost and maintenance difficulty are reduced; adjustment capacity is strong, pin spacing adjustment range is wide, adaptability and flexibility are high; by using the self-locking characteristics of trapezoidal thread, safety locking performance is greatly improved, accidental tool falling is avoided, construction safety is ensured, and work efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of excavator quick connector technology, specifically to an electrically driven quick connector for excavators. Background Technology

[0002] Currently, while hydraulic cylinder-type quick connectors widely used in municipal engineering rescue have some effectiveness, they also have significant drawbacks. Their hydraulic systems require complex piping and solenoid valves, with installation typically taking over 5 hours, and incompatible parts further extend the debugging time. After prolonged use, problems such as worn oil seals inside the cylinder, aging and damaged piping, stuck solenoid valves, or short circuits in the coil frequently occur, leading to oil leaks, pressure drops, operational failures, and even lock hook shaft breakage. Furthermore, existing connectors have limited adaptive adjustment capabilities for pin dimensions and spacing, relying on cylinder stroke or lead screw turning, resulting in a small adjustment range and susceptibility to environmental interference. In addition, there are safety locking vulnerabilities. Hydraulic connector locking relies on cylinder drive; if the cylinder fails, the attachment may accidentally detach. While some improvements include a safety pin hole clearance contact design, manual intervention is still required, failing to completely solve the backup locking problem after hydraulic system failure. Mechanical connectors, under vibration or impact loads, are prone to loosening of the locking plate, and the pin may still move. Utility Model Content

[0003] The technical problem this invention aims to solve is to overcome the above-mentioned technical defects and provide a quick-connector for electric drive in excavators. It enables quick connection of attachments, offers a wide range of pin spacing adjustment, and has a reliable locking mechanism.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a quick connector for electric drive in excavators, comprising:

[0005] The connector body includes two mounting plates arranged opposite each other. The front and rear ends of the two mounting plates are connected by a front rib plate and a rear rib plate, respectively. Both mounting plates have a bayonet at the bottom of their rear ends.

[0006] The drive locking mechanism includes:

[0007] A dual-axis motor is disposed between the two mounting plates, and the dual-axis motor has two independently controlled output shafts;

[0008] A front threaded rod, one end of which is connected to one output shaft of the dual-axis motor;

[0009] The rear threaded rod has one end connected to the other output shaft of the dual-axis motor;

[0010] The movable lock is threadedly connected to the front threaded rod and can move axially along the front threaded rod as the front threaded rod rotates.

[0011] The wedge assembly is threadedly connected to the rear threaded rod and is able to move axially along the rear threaded rod in response to rotation of the rear threaded rod.

[0012] The wedge assembly and the bayonet together form a clamping part for clamping the rear pin of the attachment; the movable lock is used to lock or release the front pin of the attachment.

[0013] As a preferred embodiment of this application, two connecting shafts are provided between the two mounting plates, and each mounting plate is provided with a limiting bushing for mounting the connecting shaft. The outer end of the limiting bushing is locked and fixed to the connecting shaft by a locking bolt and a locking nut.

[0014] As a preferred embodiment of this application, both of the inner front ends of the two mounting plates are provided with front guide rails, and both sides of the movable lock are provided with front guide grooves that slide with the front guide rails; both of the inner rear ends of the two mounting plates are provided with limiting blocks, the limiting blocks are provided with rear guide grooves, and both sides of the wedge block assembly are provided with rear guide strips that slide with the rear guide grooves.

[0015] As a preferred embodiment of this application, the rear end of the front guide rail is connected to the front end of the limiting block.

[0016] As a preferred embodiment of this application, both the outer ends of the front threaded rod and the rear threaded rod are provided with limiting nuts.

[0017] As a preferred embodiment of this application, a support plate is provided between the two mounting plates, and the dual-axis motor is mounted on the support plate via a motor mounting plate and corresponding bolts.

[0018] As a preferred embodiment of this application, the movable lock is provided with a contact sensor for detecting whether the movable lock has contacted the displacement limit position or the front pin of the attachment.

[0019] As a preferred embodiment of this application, the connection between the front threaded rod and the movable lock, and the connection between the rear threaded rod and the wedge block assembly, are both trapezoidal threaded connections, and the thread helix angle of the trapezoidal thread is less than or equal to the equivalent friction angle, so as to achieve the self-locking function.

[0020] The electric quick connector for excavators disclosed in this application offers significant advantages. In terms of drive method, it eliminates the complex hydraulic system of traditional hydraulic cylinder connectors, adopting electric drive instead. This eliminates the need for complex piping and directional solenoid valves, greatly shortening installation time and avoiding prolonged debugging time due to incompatible parts, thus reducing operating costs and maintenance difficulty.

[0021] Its adjustment capability is superior. By independently controlling the front and rear threaded rods with dual-axis motors, the movable lock and wedge block assembly can move independently, achieving precise locking and releasing of the front and rear pins of the attachment. The pin spacing adjustment range is wide and is not easily affected by environmental factors, improving the adaptability and flexibility of the connection.

[0022] The safety locking performance has also been significantly improved. Utilizing the self-locking characteristics of the trapezoidal thread, even if the dual-axis motor loses power or the drive fails, the movable lock and wedge block assembly can maintain their current position, effectively preventing accidental attachment detachment and providing reliable protection for construction safety. Overall, this connector improves work efficiency and enhances the safety and stability of its use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a quick connector for electric drive in an excavator according to this application;

[0024] Figure 2 This is a side view of a quick connector for electric drive in an excavator, as described in this application.

[0025] Figure 3 This is a front view schematic diagram of the internal structure of a quick connector for electric drive in an excavator according to this application;

[0026] Figure 4 This is a schematic diagram of the bottom structure of a quick connector for electric drive in an excavator according to this application;

[0027] Figure 5 This is a usage diagram of a quick connector for electric drive in an excavator according to this application.

[0028] As shown in the figure: 1. Mounting plate, 2. Front rib plate, 3. Rear rib plate, 4. Bayonet, 5. Dual-axis motor, 6. Front threaded rod, 7. Rear threaded rod, 8. Movable lock, 9. Wedge block assembly, 10. Rear pin of attachment, 11. Connecting shaft, 12. Limiting bushing, 13. Locking bolt, 14. Locking nut, 15. Front guide rail, 16. Rear guide groove, 17. Limiting block, 18. Limiting nut, 19. Support plate, 20. Contact sensor, 21. Alarm, 22. Wiring harness, 23. Front pin of attachment. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings.

[0030] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0031] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0032] To make the content of this utility model easier to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] See attached document Figure 1 With appendix Figure 5 A quick-connector for electric excavators is disclosed, the core of which consists of a connector body and a drive locking mechanism. The connector body comprises two opposing mounting plates 1, which serve as the supporting frame for the entire connector, playing a crucial role in connecting and securing other components. The front and rear ends of the two mounting plates 1 are securely connected by a front rib plate 2 and a rear rib plate 3, respectively. These rib plates not only enhance the structural strength between the mounting plates 1 but also provide excellent stability for the entire connector, making it less prone to deformation under various external forces during excavator operation. Each mounting plate 1 has a bayonet 4 at its rear end. The shape and size of the bayonet 4 are carefully designed to match the rear pin 10 of the attachment, providing a basis for subsequent locking operations.

[0034] The drive locking mechanism is a key functional component of this quick connector. A dual-axis motor 5, positioned between the two mounting plates 1, serves as the power source for the entire drive system. It has two independently controlled output shafts, allowing the dual-axis motor 5 to simultaneously or separately control the rotation of the front threaded rod 6 and the rear threaded rod 7, thus enabling independent movement of the movable lock 8 and the wedge assembly 9. One end of the front threaded rod 6 is connected to one output shaft of the dual-axis motor 5, and one end of the rear threaded rod 7 is connected to the other output shaft of the dual-axis motor 5. These two shafts respectively drive the movable lock 8 and the wedge assembly 9. The movable lock 8 is threaded onto the front threaded rod 6. When the dual-axis motor 5 drives the front threaded rod 6 to rotate, the movable lock 8 moves axially along the rotation of the front threaded rod 6, thereby locking or releasing the front pin 23 of the attachment. The wedge assembly 9 is threaded onto the rear threaded rod 7 and can also move axially along the rear threaded rod 7 as it rotates. The wedge assembly 9 and the bayonet 4 together form a clamping part for clamping the rear pin 10 of the attachment, ensuring that the attachment will not loosen or fall off during the operation of the excavator.

[0035] To achieve a rotatable connection between the connector and the excavator's connecting arm, two connecting shafts 11 are positioned between two mounting plates 1. Each mounting plate 1 is equipped with a limiting sleeve 12 for mounting the connecting shaft 11. The limiting sleeve 12 precisely positions the connecting shaft 11, ensuring accurate installation. The outer end of the limiting sleeve 12 is locked to the connecting shaft 11 by locking bolts 13 and locking nuts 14. This locking method is not only convenient to install but also provides reliable connection strength, ensuring that the connecting shaft 11 will not loosen or fall off during excavator operation, thus allowing the entire connector and attachment to rotate flexibly with the excavator's connecting arm.

[0036] To ensure stability, the inner front ends of the two mounting plates 1 are provided with front guide rails 15, and the front guide grooves on both sides of the movable lock 8 are slidably engaged with the front guide rails 15; the inner rear ends of the mounting plates 1 are provided with limit blocks 17 and rear guide grooves 16, and the rear guide strips on both sides of the wedge assembly 9 are slidably engaged with the rear guide grooves 16, ensuring that the movable lock 8 and the wedge assembly 9 only move axially without radial displacement. At the same time, the limit blocks 17 are used to limit the maximum travel of the movable lock 8 and the wedge assembly 9; the limit nuts 18 provided at the outer ends of the front threaded rod 6 and the rear threaded rod 7 can further prevent the movable lock 8 and the wedge assembly 9 from disengaging from the threaded rods.

[0037] In this embodiment, the front threaded rod 6 and the movable lock 8, and the rear threaded rod 7 and the wedge assembly 9 are all connected by trapezoidal threads, and the thread helix angle is ≤ equivalent friction angle. Mechanical locking can be achieved through the thread self-locking characteristic. Even if the dual-axis motor 5 is powered off or the drive fails, the movable lock 8 and the wedge assembly 9 can maintain their current position to prevent the attachment from falling off accidentally.

[0038] In actual operation, this connector achieves automated connection and disconnection through the matching electrical control system. The system includes a controller, a driver, a current detection circuit, a contact sensor 20, and an alarm. The controller and driver are integrated and installed above the dual-axis motor 5. The current detection circuit is connected in series in the power supply circuit of the dual-axis motor 5. The contact sensor 20 is embedded in the front end of the movable lock 8. The alarm 21 is connected to the controller through the wiring harness 22 (which can be installed in the excavator cab).

[0039] When using quick connectors to connect attachments:

[0040] The operator aligns the connector's bayonet 4 with the attachment's rear pin 10, so that the rear pin 10 is initially engaged in the bayonet 4.

[0041] After the connection program is started, the controller controls the rear output shaft of the dual-axis motor 5 to rotate through the driver, which drives the rear threaded rod 7 to drive the wedge block assembly 9 to move horizontally backward along the rear guide groove 16;

[0042] As the wedge assembly 9 gradually approaches and contacts the rear pin 10 of the attachment, the load on the dual-axis motor 5 increases. The current detection circuit detects that the power supply current rises from a stable value to a preset threshold (which corresponds to the load when the pin contacts), and then sends a signal to the controller.

[0043] After receiving the signal, the controller stops the output shaft of the dual-axis motor 5 through the driver and synchronously starts the front output shaft to rotate. The front threaded rod 6 drives the movable lock 8 to move horizontally forward along the front guide rail 15.

[0044] When the contact sensor 20 at the front end of the active lock 8 touches the pin 23 at the front end of the attachment, the contact sensor 20 sends an position signal to the controller, and the controller stops the front output shaft of the dual-axis motor 5 through the driver.

[0045] At this time, the front threaded rod 6 and the movable lock 8, and the rear threaded rod 7 and the wedge assembly 9 are all self-locked by trapezoidal threads. The movable lock 8 and the wedge assembly 9 respectively lock the front pin 23 and the rear pin 10 of the attachment, thus completing the connection.

[0046] When using quick connectors to detach attachments:

[0047] After the disassembly procedure is started, the controller controls the front output shaft of the dual-axis motor 5 to rotate in the opposite direction through the driver, which drives the movable lock 8 to move horizontally backward along the front guide rail 15.

[0048] As the movable lock 8 gradually moves away from the front pin 23 of the attachment, when the rear end of the movable lock 8 touches the front end of the limit block 17, the load on the dual-axis motor 5 increases, the current detection circuit detects that the current has risen to the preset threshold and sends a signal to the controller.

[0049] After receiving the signal, the controller stops the front output shaft of the dual-axis motor 5 from working and simultaneously starts the rear output shaft to rotate in the opposite direction, driving the wedge block assembly 9 to move horizontally forward along the rear guide groove 16;

[0050] As the wedge assembly 9 gradually moves away from the rear pin 10 of the attachment, when the front end of the wedge assembly 9 reaches the front end of the rear guide groove 16, the current detection circuit detects that the current has risen to a preset threshold and sends a signal to the controller. The controller then stops the output shaft of the dual-axis motor 5 through the driver.

[0051] If the distance between the movable lock 8 and the front pin 23 of the attachment exceeds the safety threshold during disassembly (judged by the feedback signal from the contact sensor 20), the controller will trigger the alarm to issue an audible and visual alarm, reminding the operator that "the front lock has been released," thus avoiding misoperation when the attachment is not completely disengaged.

[0052] Technical effects of this embodiment: The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention. The actual structure is not limited to this. In short, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A quick connector for electric drive in excavators, characterized in that, include: The connector body includes two mounting plates (1) arranged opposite to each other. The front and rear ends of the two mounting plates (1) are connected by a front rib plate (2) and a rear rib plate (3) respectively. The bottom of the rear ends of the two mounting plates (1) are provided with a bayonet (4). The drive locking mechanism includes: A dual-axis motor (5) is disposed between the two mounting plates (1), the dual-axis motor (5) having two independently controlled output shafts; A front threaded rod (6), one end of which is connected to one output shaft of the dual-axis motor (5); The rear threaded rod (7) has one end connected to the other output shaft of the dual-axis motor (5); The movable lock (8) is threadedly connected to the front threaded rod (6) and can move along the axial direction of the front threaded rod (6) as the front threaded rod (6) rotates; The wedge assembly (9) is threadedly connected to the rear threaded rod (7) and is able to move axially along the rear threaded rod (7) in response to the rotation of the rear threaded rod (7); The wedge assembly (9) and the bayonet (4) together form a clamping part for clamping the attachment pin (10); the movable lock (8) is used to lock or release the attachment front pin (23).

2. The quick connector for electric drive in excavators according to claim 1, characterized in that: Two connecting shafts (11) are provided between the two mounting plates (1), and each of the two mounting plates (1) is provided with a limiting bushing (12) for installing the connecting shaft (11). The outer end of the limiting bushing (12) is locked and fixed to the connecting shaft (11) by a locking bolt (13) and a locking nut (14).

3. The quick connector for electric drive in excavators according to claim 1, characterized in that: Both mounting plates (1) have a front guide rail (15) on their inner front end, and both sides of the movable lock (8) have a front guide groove that slides with the front guide rail (15); both mounting plates (1) have a limit block (17) on their inner rear end, and the limit block (17) has a rear guide groove (16), and both sides of the wedge assembly (9) have a rear guide strip that slides with the rear guide groove (16).

4. A quick connector for electric drive in an excavator according to claim 3, characterized in that: The rear end of the front guide rail (15) is connected to the front end of the limiting block (17).

5. A quick connector for electric drive in an excavator according to claim 1, characterized in that: The outer ends of both the front threaded rod (6) and the rear threaded rod (7) are provided with limiting nuts (18).

6. A quick connector for electric drive in an excavator according to claim 1, characterized in that: A support plate (19) is provided between the two mounting plates (1), and the dual-axis motor (5) is mounted on the support plate (19) via the motor mounting plate (1) and corresponding bolts.

7. A quick connector for electric drive in an excavator according to claim 1, characterized in that: The movable lock (8) is equipped with a contact sensor (20) for detecting whether the movable lock (8) has contacted the displacement limit position or the rear pin (23) of the attachment.

8. A quick connector for electric drive in an excavator according to claim 1, characterized in that: The front threaded rod (6) and the movable lock (8), as well as the rear threaded rod (7) and the wedge assembly (9), are connected by trapezoidal threads, and the thread helix angle of the trapezoidal thread is less than or equal to the equivalent friction angle to achieve a self-locking function.

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