Flexible shaft clamping device

Abstract

The utility model discloses a flexible shaft clamping device with simple structure, convenient and comfortable operation, comprising a sleeve rotatably arranged at the front end of a wheel hub and a flexible shaft extending out of the sleeve; a fixed bearing assembly and a movable bearing assembly for clamping the flexible shaft are arranged inside the sleeve; a rotating sleeve is rotatably arranged outside the sleeve, and locking protrusions for limiting rotation are arranged on the inner wall of the rotating sleeve and the outer wall of the sleeve; a circle of gear grooves are evenly distributed on the inner wall of the rotating sleeve, and a rotating positioning part that moves between the gear grooves is arranged on the outer wall of the sleeve; a cam ring that rotates with the rotating sleeve is arranged on the inner wall of the rotating sleeve, and the rotation of the rotating sleeve drives the cam ring to press down or release the movable bearing assembly to control the clamping or release of the flexible shaft; the top surface of the movable bearing assembly is in arc-shaped sliding contact with the inner wall of the cam ring.

Description

Technical Field

[0001] The utility model relates to a pipeline dredging machine, in particular to a flexible shaft pressing device in the dredging machine. Background Art

[0002] At present, the feeding of the flexible shaft of a small dredging machine is basically controlled by pressing the trigger handle. When working, the operator holds the handle with one hand and presses the trigger at the same time, and holds the electric wrench with the other hand. After the electric wrench is started, it drives the wheel hub to rotate forward or reverse, and then drives the flexible shaft to extend outward or contract inward, so as to realize the automatic feeding of the flexible shaft. However, during the whole process, the operator needs to keep pressing the trigger with the hand holding the handle, so the operator is particularly prone to fatigue and hand soreness, which affects the comfort of operation; and when holding, the handle and the trigger are in the holding area at the same time. It is difficult to release the automatic feeding without holding the trigger, and the operation is inconvenient. Summary of the invention

[0003] The utility model aims to provide a flexible shaft pressing device which has a simple structure, is convenient to operate and is comfortable.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A flexible shaft clamping device comprises a sleeve rotatably arranged at the front end of a wheel hub and a flexible shaft extending out of the sleeve; a fixed bearing assembly and a movable bearing assembly for clamping the flexible shaft are arranged inside the sleeve; a rotating sleeve is rotatably arranged outside the sleeve, and the inner wall of the rotating sleeve and the outer wall of the sleeve are provided with locking protrusions for limiting rotation; a circle of gear grooves are evenly distributed on the inner wall of the rotating sleeve, and a rotating positioning part that moves between the gear grooves is provided on the outer wall of the sleeve; a cam ring that rotates with the rotating sleeve is provided on the inner wall of the rotating sleeve, and the rotation of the rotating sleeve drives the cam ring to press down or release the movable bearing assembly to control the clamping or release of the flexible shaft; the top surface of the movable bearing assembly is in arc-shaped sliding contact with the inner wall of the cam ring.

[0006] Preferably, the movable bearing assembly comprises a movable bearing arm and a movable bearing; one end of the movable bearing arm is hinged to the inner side of the sleeve, and the other end is connected to the movable bearing; a reset spring is provided at the bottom of the movable bearing arm.

[0007] Preferably, the fixed bearing assembly includes a fixed bearing seat and a fixed bearing; a slot hole is provided on the top surface of the fixed bearing seat for the flexible shaft to pass through; two fixed bearings are provided on the fixed bearing seat, and are respectively arranged on both sides of the slot hole, forming a triangular structure with the movable bearing assembly to clamp the flexible shaft.

[0008] Preferably, a shaft locking spring is provided in the sleeve at the rear end of the movable bearing arm, and a boss is provided at the rear end of the movable bearing arm; one end of the shaft locking spring is hinged in the sleeve, and the other end is clamped on the soft shaft, and the middle part rests on the boss and moves away from or locks the soft shaft as the movable bearing arm rotates.

[0009] Preferably, the rotation positioning portion includes a spring arranged on the outer wall of the sleeve and a steel ball located at the tail end of the spring. When the rotating sleeve rotates, the steel ball moves to a locking position in the gear groove.

[0010] Preferably, a rotatable steel ball is provided on the top surface of the movable bearing assembly, and the steel ball is in sliding contact with the inner wall of the cam ring when the rotating sleeve rotates.

[0011] Preferably, the outer wall of the rotating sleeve is provided with a rotation mark for locking or loosening the flexible shaft.

[0012] Compared with the prior art, the present invention has the following beneficial effects: first, a fixed bearing assembly and a movable bearing assembly for clamping the flexible shaft are arranged in the sleeve, a rotatable rotating sleeve is arranged outside the sleeve, a cam ring is arranged in the rotating sleeve, and the cam ring is driven to rotate by rotating the rotating sleeve, and the convex portion of the cam ring is used to gradually press down or release the movable bearing assembly to control the movable bearing assembly to approach or move away from the fixed bearing assembly, thereby realizing the compression or loosening of the flexible shaft, and the structure is simple and the operation is convenient; second, due to a circle of gear grooves evenly arranged on the inner wall of the rotating sleeve, a rotating positioning part that can move between the gear grooves is arranged on the outer wall of the sleeve, so that when the rotating sleeve rotates, the rotating positioning part moves in the gear groove, and there is a prompt sound of clicking, and it rotates to the corresponding position. When the positioning part is rotated, it enters the gear groove and locks the position to maintain the rotation angle. When unblocking the pipeline, after rotating the sleeve to a suitable position, you can directly hold the handle with one hand and control the electric wrench or hand wrench with the other hand to realize automatic feeding of the flexible shaft. No additional force is required, and the operation is very easy and comfortable. Third, the inner wall of the sleeve and the outer wall of the sleeve are provided with locking protrusions to limit the rotation to avoid excessive rotation of the sleeve, which plays the role of loosening stop and locking stop, and the locking function can be adjusted by adjusting the gap of the locking protrusion to adapt to the errors caused by wear of parts. Fourth, the top surface of the movable bearing assembly is in arc sliding contact with the inner wall of the cam ring, and the arc sliding contact makes the sleeve more comfortable and easy when rotating.

[0013] Further beneficial effects: first, the movable bearing arm is hinged in the sleeve, and a return spring is provided at the bottom of the sleeve. When the swivel sleeve is rotated to drive the cam to rotate, the cam presses down the movable bearing arm to drive the movable bearing gradually close to the flexible shaft until the flexible shaft is locked by the movable bearing assembly and the fixed bearing assembly, and the steel ball falls into the gear groove. The reverse rotation of the swivel sleeve drives the cam to reverse, and the cam gradually disengages from the movable bearing arm under the action of the return spring at its bottom, and gradually loosens the flexible shaft to return to its initial state. The hinged structure and the return spring make it easier and more convenient to rotate the swivel sleeve to press the flexible shaft; second, the fixed bearing assembly is provided with two fixed bearings, and form a triangular structure with the movable bearing assembly to clamp the flexible shaft. The triangular clamping structure is more stable and has a stronger clamping force; third, a locking shaft spring is provided at the tail end of the movable bearing assembly, one end of the locking shaft spring is clamped on the flexible shaft, and the other end is against the boss at the tail end of the movable bearing assembly. When the swivel sleeve is rotated to clamp the flexible shaft, The movable bearing assembly is pressed down and rotates around the hinge, and the boss gradually rises and lifts the shaft-locking spring to release it away from the flexible shaft. When the rotating sleeve is reversed to loosen the flexible shaft, the boss releases the squeeze on the shaft-locking spring as the movable bearing assembly rotates, and the shaft-locking spring falls and clamps the flexible shaft. The flexible shaft is controlled to pop out by means of such a linkage mechanism, and the operation is very safe and convenient; fourth, a rotating positioning part composed of a steel ball and a spring is adopted, which makes it easier for the rotating sleeve to rotate. When the rotating sleeve rotates to the corresponding position, the steel ball falls into the gear groove to lock the position, and the rotation angle can be maintained more stably; fifth, a rotatable steel ball is arranged on the top surface of the movable bearing assembly. When the rotating sleeve rotates, the steel ball slides in contact with the inner wall of the cam ring, which effectively reduces friction, reduces the wear of parts, effectively improves the service life of the cam ring and the movable bearing assembly, and ensures the clamping force of the flexible shaft; sixth, a rotation mark is provided on the outer wall of the rotating sleeve, which is convenient for the operator to rotate the rotating sleeve to lock or loosen the flexible shaft, and the operation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model of the flexible shaft pressing device installed in the dredging machine;

[0015] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure in the middle A direction;

[0016] Figure 3 It is a schematic diagram of the internal structure of the flexible shaft pressing device of the utility model;

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the flexible shaft pressing device of the utility model after the sleeve is removed;

[0018] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure along the B direction;

[0019] Figure 6 It is a schematic diagram of the three-dimensional exploded structure of the flexible shaft pressing device of the utility model after the sleeve is removed;

[0020] Figure 7 It is a three-dimensional structural schematic diagram of the rotating sleeve in the flexible shaft pressing device of the utility model;

[0021] Among them, 1. swivel sleeve; 2. fixed bearing assembly; 3. movable bearing assembly; 4. reset spring; 5. lock shaft spring; 6. retaining ring; 7. decorative cover; 8. cam ring; 9. rotation positioning part; 10. rotation mark; 11. gear groove; 12. steel ball; 20. fixed bearing seat; 30. movable bearing seat; 31. boss; 32. steel ball; 80. locking protrusion 1; 81. locking protrusion 2; 90. steel ball; 91. spring; 100. flexible shaft; 200. wheel hub; 300. sleeve; 301. limiting surface; 400. rotating part; 500. hand-held part; 600. rotating shaft; 700. manual crank. DETAILED DESCRIPTION

[0022] In order to make the technical solution of the utility model clearer, the following Figure 1-7 It should be understood that the specific implementation methods described in this specification are only for explaining the utility model, and are not intended to limit the protection scope of the utility model.

[0023] A flexible shaft clamping device, comprising a flexible shaft 100, a sleeve 300, a rotating sleeve 1, a fixed bearing assembly 2, a movable bearing assembly 3, a reset spring 4 and a shaft locking spring 5; the sleeve 300 is installed at the front end of the dredging machine hub 200, and the flexible shaft 100 is coiled in the hub 200; the hub 200, the flexible shaft 100, and the sleeve 300 are all prior art; the flexible shaft 100 is an integrated or combined type, and the flexible shaft head can have different functional shapes and can be assembled or made into one with the flexible shaft, and is used to clear blockages in pipelines; the flexible shaft 100 is coiled in the hub 200, the sleeve 300 is rotatably arranged in front of the hub 200, and one end of the flexible shaft 100 is extended from the hub 200 passes through the sleeve 300; a rotating part 400 is provided at the front end of the wheel hub 200, and the rotating part 400 is rotatably inserted into the sleeve 300, so that the relative rotation of the wheel hub 200 and the sleeve 300 is realized by the rotating part 400; a hand-held part 500 is provided on the outer side of the sleeve 300 near the end of the wheel hub 200, and the hand-held part 500 of the present embodiment is composed of a plurality of convex ribs evenly distributed on the outside of the sleeve 300 in an annular shape, and can also be made into a sleeve-shaped hand-held part, which is detachably fixed on the outside of the sleeve, and the wheel hub 200 can be rotated forward and reverse by holding the hand-held part 500, and the forward and reverse rotation of the wheel hub 200 can be controlled by a manual crank 700, or by an electric drive shaft 600.

[0024] The fixed bearing assembly 2, the movable bearing assembly 3, and the return spring 4 are all arranged in the sleeve 300; the fixed bearing assembly 2 is fixed in the sleeve 300 and is arranged below the flexible shaft 100, and the fixed bearing assembly 2 includes a fixed bearing seat 20 and two fixed bearings; the top surface of the fixed bearing seat 20 is provided with a slot for the flexible shaft 100 to pass through; the two fixed bearings are both installed on the fixed bearing seat 20, and the two fixed bearings are respectively arranged on both sides of the slot; one end of the movable bearing assembly 3 is hinged in the sleeve 300 and is arranged above the flexible shaft 100; the movable bearing assembly 3 includes a movable bearing arm 30 and a movable bearing; one end of the movable bearing arm 30 is hinged to the inner side of the sleeve 300, and the other end is fixedly connected to the movable bearing, and the movable bearing and the two fixed bearings form a triangular structure to clamp the flexible shaft 100 together; the return spring 4 is arranged at the bottom of the movable bearing arm 30 to provide elastic restoring force for the movable bearing arm 30.

[0025] The rotating sleeve 1 is arranged at the front end of the sleeve 300. The front end diameter of the sleeve 300 in this embodiment becomes smaller to form a limiting surface 301. A snap ring 6 is provided at the front end of the sleeve 300. The limiting surface 301 and the snap ring 6 limit the axial movement of the rotating sleeve 1 at the front end of the sleeve 300, that is, the rotating sleeve 1 is sleeved on the front end of the sleeve 300 and is restricted in axial movement by the limiting surface 301 and the snap ring 6 of the sleeve 300. A decorative cover 7 is also provided at the front end of the rotating sleeve 1. The inner wall at the rear end of the rotating sleeve 1 and the outer wall of the sleeve 300 are correspondingly provided with locking protrusions for limiting rotation, that is, a locking protrusion 1 80 extends inwardly from the inner wall at the rear end of the rotating sleeve 1, and a locking protrusion 2 81 extends outwardly from the corresponding outer wall of the sleeve 300. The rotating sleeve 1 can only rotate forward or reverse on the sleeve 300 within 360 degrees. The outer wall of the rotating sleeve 1 is provided with a rotation mark 10 for locking or loosening the flexible shaft 100. The inner wall of the rotating sleeve 1 is inlaid with a The cam ring 8, the protruding part of the inner wall of the cam ring 8 contacts the top of the movable bearing arm 30 to press down the movable bearing arm 30, and the movable bearing on the movable bearing arm 30 and the fixed bearing jointly clamp the flexible shaft 100; the top surface of the movable bearing arm 30 is provided with a pit, and a rotatable steel ball 32 is clamped in the pit (that is, the steel ball can rotate in the pit), and the steel ball 32 extends out of the pit and slides in contact with the inner wall of the cam ring 8; the inner wall of the tail end of the rotating sleeve 1 is evenly distributed with a circle of gear grooves 11, and the outer wall of the sleeve 300 is provided with a rotating positioning part 9 that moves between the gear grooves 11. The rotating positioning part 9 of this embodiment is composed of a spring 91 and a steel ball 90. One end of the spring 91 is fixed in the column groove of the outer wall of the sleeve 300, and the other end is against the steel ball 90. When the rotating sleeve 1 rotates, the steel ball 90 can move in the gear groove 11, and when it rotates to the corresponding position, the steel ball 90 falls into the gear groove 11 and locks the position.

[0026] A boss 31 is provided at the rear end of the movable bearing arm 30, and the boss 31 and the movable bearing arm 30 are an integrated structure; a locking shaft spring 5 is also provided at the rear end of the boss located in the movable bearing arm 30 in the sleeve 300; one end of the locking shaft spring 5 is hinged in the sleeve 300 through a spring pin, and the other end is clamped on the soft shaft 100, the boss 31 is against the middle part of the locking shaft spring 5, and the locking shaft spring 5 rotates around the spring pin to lift the locking shaft spring 5 away from the soft shaft or lower it to lock the soft shaft 100.

[0027] The operation steps of the forward rotation of the rotating sleeve 1 to press the flexible shaft 100 are as follows: the rotating sleeve 1 rotates forward, and the cam ring 8 inside the rotating sleeve 1 gradually presses down the movable bearing arm 30 until the movable bearing and the fixed bearing jointly press the flexible shaft 100, the reset spring 4 is compressed, and the steel ball 90 falls into the gear groove 11 and is locked. The boss 31 set at the other end of the movable bearing arm 30 drives the locking shaft spring 5 to rotate and rise around the spring pin to lift the locking shaft spring 5, and the locking shaft spring 5 leaves the flexible shaft 100, releasing the locking of the flexible shaft 100. At this time, the rotating shaft 600 is manually driven by the manual crank 700 or electrically driven by tools such as an electric drill to rotate, thereby driving the wheel hub 200 to rotate, and the flexible shaft 100 can realize automatic feeding or retracting of the wheel hub 200.

[0028] The operation steps of reversing the rotating sleeve 1 to loosen the flexible shaft 100 are as follows: the rotating sleeve 1 is reversed, and the cam ring 8 inside the rotating sleeve 1 gradually leaves the movable bearing arm 30, and the movable bearing arm 30 moves upward under the action of the reset spring 4 until the flexible shaft 100 is loosened, and the steel ball 90 falls into the gear groove 11 and is locked, and the boss 31 arranged on the movable bearing arm 30 rotates with the movable bearing arm 30, and the locking spring 5 falls to lock the flexible shaft 100. At this time, the wheel hub 200 is driven to rotate manually or electrically, and the flexible shaft 100 rotates with the wheel hub 200 to clear the pipeline.

[0029] In the description of the present technical solution, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "inner" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present technical solution and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present technical solution.

[0030] At the same time, in the description of this technical solution, it should be noted that, unless otherwise clearly specified and limited, the terms "fixed" and "matched" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this technical solution can be understood according to specific circumstances.

[0031] Although embodiments of the present technical solution have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present technical solution, and that the scope of the present technical solution is defined by the appended claims and their equivalents.

Claims

1. A flexible shaft pressing device, comprising a sleeve (300) rotatably arranged at the front end of a hub (200), and a flexible shaft (100) extending out of the sleeve (300), characterized in that: The sleeve (300) is provided with a fixed bearing assembly (2) and a movable bearing assembly (3) for clamping the flexible shaft (100); a rotating sleeve (1) is rotatably provided outside the sleeve (300), and the inner wall of the rotating sleeve (1) and the outer wall of the sleeve (300) are provided with locking protrusions for limiting rotation; the inner wall of the rotating sleeve (1) is evenly provided with a circle of gear grooves (11), and the outer wall of the sleeve (300) is provided with a rotating positioning portion (9) that moves between the gear grooves (11); the inner wall of the rotating sleeve (1) is provided with a cam ring (8) that rotates with the rotating sleeve (1), and the rotation of the rotating sleeve (1) drives the cam ring (8) to press down or release the movable bearing assembly (3) to control the clamping or release of the flexible shaft (100); the top surface of the movable bearing assembly (3) is in arc-shaped sliding contact with the inner wall of the cam ring (8).

2. The flexible shaft pressing device according to claim 1, characterized in that: The movable bearing assembly (3) comprises a movable bearing arm (30) and a movable bearing; one end of the movable bearing arm (30) is hinged to the inner side of the sleeve (300), and the other end is connected to the movable bearing; a return spring (4) is provided at the bottom of the movable bearing arm (30).

3. The flexible shaft pressing device according to claim 2, characterized in that: The fixed bearing assembly (2) comprises a fixed bearing seat (20) and a fixed bearing; a slot hole is provided on the top surface of the fixed bearing seat (20) for the flexible shaft (100) to pass through; two fixed bearings are provided on the fixed bearing seat (20), and are respectively arranged on both sides of the slot hole, forming a triangular structure with the movable bearing assembly (3) to clamp the flexible shaft (100).

4. The flexible shaft pressing device according to claim 2 or 3, characterized in that: A shaft locking spring (5) is provided in the sleeve (300) at the rear end of the movable bearing arm (30), and a boss (31) is provided at the rear end of the movable bearing arm (30); one end of the shaft locking spring (5) is hinged in the sleeve (300), and the other end is clamped on the flexible shaft (100), and the middle part abuts against the boss (31) and moves away from or locks the flexible shaft (100) as the movable bearing arm (30) rotates.

5. The flexible shaft pressing device according to claim 1, characterized in that: The rotating positioning part (9) comprises a spring (91) arranged on the outer wall of the sleeve (300) and a steel ball (90) located at the tail end of the spring (91); when the rotating sleeve (1) rotates, the steel ball (90) moves to a locking position in the gear groove (11).

6. The flexible shaft pressing device according to claim 1, characterized in that: The top surface of the movable bearing assembly (3) is provided with a rotatable steel ball (12), and when the rotating sleeve (1) rotates, the steel ball (12) is in sliding contact with the inner wall of the cam ring (8).

7. The flexible shaft pressing device according to claim 1, characterized in that: The outer wall of the rotating sleeve (1) is provided with a rotation mark (10) for locking or loosening the flexible shaft (100).

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