Telescopic rope ladder head

Abstract

The invention discloses a telescopic rope ladder head which comprises a ladder head body, a telescopic assembly, a hanging assembly and a locking and unlocking assembly, the ladder head body comprises two parallel ladder columns and a step rod unit connected between the two ladder columns, and rope ladder connectors are arranged at the bottom ends of the ladder columns; the hanging assembly comprises a hook part and a pulley arranged on the inner side of the hook part; the telescopic assembly is connected between the ladder head body and the hanging assembly and is used for automatically adjusting the height difference between the ladder column and the hanging assembly according to the inclination angle of the cable; the locking and unlocking assembly is installed on the hook part and comprises a locking unit and an unlocking unit, wherein the locking unit is used for locking the pulley to enable the pulley hung on the line to automatically stop rotating, and the unlocking unit is used for unlocking the locking action of the locking unit to enable the pulley to rotate.

Description

Technical Field

[0001] The invention relates to the field of soft ladder heads, in particular to a retractable soft ladder head. Background Art

[0002] A ladder is a tool used for aerial work and climbing, mainly in the form of a rope. A ladder head is a convenient tool used to connect a ladder and hang it on a conductor for live work.

[0003] Patent CN 204457406 U discloses a soft ladder connector for high-altitude operations on power transmission lines, in particular, an adjustable soft ladder head for power transmission lines. The key points of its structure are that it includes two adjustable ladder columns and a pulley device, each adjustable ladder column includes a fixed ladder column and a movable ladder column, the upper side portion of the fixed ladder column is hollow, and a plurality of transverse through holes are distributed along the axial direction, and the movable ladder column is located in the hollow inner cavity of the fixed ladder column, and can move up and down relative to the fixed ladder column, thereby adjusting the length of the adjustable ladder column end, and finally fixed by a latch. The key point is that the upper end of the ladder column of the soft ladder head can be adjusted in height. When hanging a ladder on an overhead line with a large height difference in the transmission line span, the high soft ladder column can be lowered so that both pulleys of the soft ladder head can be hung in the overhead line without falling off. The height of the soft ladder head can be adjusted arbitrarily according to the height difference of the overhead line span.

[0004] However, the soft ladder connector disclosed in the above patent cannot control the locking and unlocking of the pulley as needed during use, resulting in poor stability of the soft ladder head; in addition, the height adjustment device of the soft ladder connector disclosed in the above patent needs to be adjusted manually and cannot be automatically adjusted according to the inclination angle of the cable, which is not only time-consuming and labor-intensive, but also has low safety and poses a safety hazard.

[0005] Therefore, in the face of the above-mentioned problems currently existing, it is a technical problem to be urgently solved to develop a retractable soft ladder head that can automatically control the locking and unlocking of the pulley during operation. Summary of the invention

[0006] The object of the present invention is to provide a retractable soft ladder head to solve the problem that the existing retractable soft ladder head cannot automatically control the locking and unlocking of the pulley according to the inclination angle of the cable.

[0007] In order to solve the above technical problems, the present invention provides a retractable soft ladder head, comprising a ladder head body, a retractable assembly, a hanging assembly and the locking and unlocking assembly;

[0008] The ladder head body comprises two ladder columns arranged in parallel and a step rod unit connected between the two ladder columns, and a soft ladder connector is provided at the bottom end of the ladder column;

[0009] The hook assembly includes a hook portion and a pulley disposed inside the hook portion;

[0010] The telescopic assembly is connected between the ladder head body and the hanging assembly, and is used to automatically adjust the height difference between the ladder column and the hanging assembly according to the inclination angle of the cable;

[0011] The locking and unlocking assembly is installed on the hook part, and comprises a locking unit for locking the pulley so that the pulley suspended on the line automatically stops rotating, and an unlocking unit for releasing the locking action of the locking unit so that the pulley can rotate.

[0012] Furthermore, the telescopic assembly includes a fixed rod, a sliding rod, a spring and a steel rope, one end of the fixed rod is fixedly connected to the hook, and the other end of the fixed rod is slidably connected to the ladder column; two first sliding grooves arranged opposite to each other are provided on the rod wall of the fixed rod, and the first sliding groove is longitudinally arranged along the rod wall of the fixed rod; two second sliding grooves matching the first sliding grooves are provided on the rod wall of the ladder column at one end connected to the fixed rod; the sliding rod transversely penetrates the first sliding groove and the second sliding groove; a first limit block is provided at one end of the fixed rod away from the ladder column, and the spring is connected between the sliding rod and the first limit block; the step rod unit is arranged below the first sliding groove, and the steel rope slides transversely through one of the step rod units, and the two ends of the steel rope respectively extend into the ladder column on the same side and are connected to the corresponding sliding rod, and the steel rope can slide in the step rod unit and the ladder column.

[0013] Furthermore, the step rod unit includes a first step rod and a third step rod which are sequentially connected between two ladder columns from top to bottom; the third step rod is penetrated by a steel rope which slides transversely, and both ends of the third step rod are respectively connected to the ladder column through a third step rod connecting head, and a second pulley matching the steel rope is installed in the third step rod connecting head, and the steel rope extends from the third step rod into the ladder column along the second pulley.

[0014] Furthermore, the steel rope is connected to the sliding rod through a steel rope connector; the two ends of the first step rod are respectively connected to the ladder column through a first step rod connector, and the first step rod connector is provided with at least two first limiting protrusions extending into the ladder column, and the gap distance between the two first limiting protrusions is greater than the diameter of the steel rope and less than the width of the connector.

[0015] Furthermore, a second step rod is provided between the first step rod and the third step rod, and both ends of the second step rod are connected to the ladder column through a second step rod connector respectively; a third pulley is provided in the second step rod connector, and the steel rope slides up and down in the ladder column along the third pulley.

[0016] Furthermore, the step rod unit also includes a fourth step rod, and both ends of the fourth step rod are connected to the bottom end of the ladder column through a fourth step rod connector.

[0017] Furthermore, the hook portion includes a connecting arm and a suspension arm and a crossbeam respectively connected to the top of the connecting arm and the top of the suspension arm; the bottom end of the connecting arm is connected to the fixed rod; and the connecting shafts on both sides of the pulley are rotatably connected to the connecting arm and the suspension arm respectively.

[0018] Furthermore, a waist-shaped mounting hole is respectively provided on the suspension arm and the connecting arm, and the connecting shafts on both sides of the pulley are respectively installed in the waist-shaped mounting holes;

[0019] The locking unit includes a locking rod and a cam, the cam is arranged in the suspension arm and fixedly connected to the connecting shaft; the locking rod includes a locking rod body, the locking rod body extends into the suspension arm and is aligned with the cam, when the first pulley is suspended on the cable, the first pulley is forced to move upward so that the cam is in close contact with the end of the locking rod body; when the first pulley is detached from the cable, the cam moves downward under the action of its own gravity and detaches from the locking rod body.

[0020] Furthermore, a limit groove is provided at the top of the suspension arm, the locking rod body is arranged in the limit groove, and one end of the locking rod body extending into the limit groove is provided with a second limit protrusion; a spring is provided in the limit groove and is sleeved on the locking rod body, and a limit cover is provided on the top of the limit groove to prevent the spring from withdrawing from the limit groove, the top of the locking rod body passes through the limit cover and extends to the outside of the limit cover, and a locking head is provided at the bottom of the locking rod body and extends downward through the bottom wall of the limit groove; the locking head is aligned with the cam, and when the first pulley is suspended on the cable, the first pulley is forced to move upward so that the cam is in close contact with the locking head; when the first pulley is detached from the cable, the pulley moves downward under the action of its own gravity to detach from the locking head.

[0021] Furthermore, the unlocking unit includes a gear and a movable plate arranged in the suspension arm; one end of the movable plate is rotatably connected to the connecting shaft of the first pulley; the gear is arranged at one end of the suspension arm away from the locking unit, and the other end of the movable plate extends toward one end of the gear. The movable plate is provided with a rack meshing with the gear, and the gear is connected to a driver, which drives the gear to rotate, and drives the movable plate through the gear to drive the connecting shaft of the first pulley away from the locking unit.

[0022] The beneficial effects of the present invention are as follows: by setting a telescopic component, it can be used to automatically adjust the height difference between the ladder column and the hanging component according to the inclination angle of the cable; by setting a locking and unlocking component, the pulley suspended on the line can be automatically locked, and can also be unlocked according to the movement needs, so that the pulley drives the soft ladder head to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0025] Figure 2It is a structural schematic diagram of one embodiment of the present invention;

[0026] Figure 3 for Figure 2 An enlarged view of the local A in FIG.

[0027] Figure 4 for Figure 2 An enlarged view of the local B in FIG.

[0028] Figure 5 It is a structural schematic diagram of another embodiment of the present invention;

[0029] Figure 6 for Figure 5 An enlarged view of the local C in FIG.

[0030] Figure 7 for Figure 5 An enlarged view of the local D in FIG.

[0031] Among them: 1. hanging assembly; 11. connecting arm; 12. crossbeam; 13. suspension arm; 131. cavity; 132. gear; 133. movable plate; 134. rack; 14. first pulley; 141. connecting shaft; 15. handle; 151. locking rod; 152. cam; 16. anti-slip rod; 2. fixing rod; 21. first slide groove; 22. first limit block; 23. spring; 3. ladder column; 31. second slide groove; 32. slide rod; 4. first step rod; 41. first step rod connector; 5. second step rod; 51. second step rod connector; 52. second pulley; 6. third step rod; 61. third step rod connector; 62. third pulley; 7. fourth step rod; 71. fourth connector; 72. soft ladder connector; 8. steel rope; 81. steel rope connector. DETAILED DESCRIPTION

[0032] like Figure 1 , Figure 2 and Figure 3 The telescopic soft ladder head shown comprises a ladder head body, a telescopic assembly, a hanging assembly 1 and a locking and unlocking assembly;

[0033] The ladder head body includes two ladder columns 3 arranged in parallel and a step rod unit connected between the two ladder columns 3. The bottom end of the ladder column 3 is provided with a flexible ladder connector 72.

[0034] The hook assembly 1 includes a hook portion and a pulley disposed inside the hook portion;

[0035] The telescopic assembly is connected between the ladder head body and the hanging assembly 1, and is used to automatically adjust the height difference between the ladder column 3 and the hanging assembly 1 according to the cable inclination angle;

[0036] The locking and unlocking assembly is installed on the hook part, and comprises a locking unit for locking the pulley so that the pulley suspended on the line automatically stops rotating, and an unlocking unit for releasing the locking action of the locking unit so that the pulley can rotate.

[0037] According to one embodiment of the present application, Figure 4 As shown, the telescopic assembly includes a fixed rod 2, a sliding rod 32, a spring 23 and a steel rope 8, one end of the fixed rod 2 is fixedly connected to the hook, and the other end of the fixed rod 2 is slidably connected to the ladder column 3; two first sliding grooves 21 arranged opposite to each other are provided on the rod wall of the fixed rod 2, and the first sliding groove 21 is longitudinally arranged along the rod wall of the fixed rod 2; two second sliding grooves 31 matching the first sliding groove 21 are provided on the rod wall of the end where the ladder column 3 is connected to the fixed rod 2; the sliding rod 32 horizontally penetrates the first sliding groove 21 and the second sliding groove 31; a first limiting block 22 is provided at one end of the fixed rod 2 away from the ladder column 3, and the spring 23 is connected between the sliding rod 32 and the first limiting block 22; the step rod unit is arranged below the first sliding groove 21, and the steel rope 8 slides horizontally through one of the step rod units, and the two ends of the steel rope 8 respectively extend into the ladder column 3 on the same side and are connected to the corresponding sliding rod 32, and the steel rope 8 can slide in the step rod unit and the ladder column 3.

[0038] According to one embodiment of the present application, the step rod unit includes a first step rod 4 and a third step rod 6 connected between two ladder columns 3 from top to bottom; Figure 7 As shown, the steel rope 8 slides transversely through the third step rod 6, and both ends of the third step rod 6 are connected to the ladder column 3 through a third step rod connector 61. A second pulley 52 matching the steel rope 8 is installed in the third step rod connector 61. The steel rope 8 extends from the third step rod 6 into the ladder column 3 along the second pulley 52.

[0039] According to one embodiment of the present application, the steel rope 8 is connected to the sliding rod 32 through a steel rope connector 81; the two ends of the first step rod 4 are respectively connected to the ladder column 3 through a first step rod connector 41, and the first step rod connector 41 is provided with at least two first limiting protrusions extending into the ladder column 3, and the gap distance between the two first limiting protrusions is greater than the diameter of the steel rope 8 and less than the width of the connector.

[0040] According to one embodiment of the present application, a second step rod 5 is provided between the first step rod 4 and the third step rod 6, and both ends of the second step rod 5 are respectively connected to the ladder column 3 through a second step rod connecting head 51; a third pulley 62 is provided in the second step rod connecting head 51, and the steel rope 8 slides up and down in the ladder column 3 along the third pulley 62.

[0041] According to an embodiment of the present application, the step rod unit further includes a fourth step rod 7 , and both ends of the fourth step rod 7 are connected to the bottom end of the ladder column 3 via a fourth step rod connector 71 .

[0042] According to one embodiment of the present application, Figure 3 and Figure 6 As shown, the hook portion includes a connecting arm 11 and a suspension arm 13 and a crossbeam 12 respectively connected to the top of the connecting arm 11 and the top of the suspension arm 13; the bottom end of the connecting arm 11 is connected to the fixing rod 2; the connecting shafts 141 on both sides of the pulley are rotatably connected to the connecting arm 11 and the suspension arm 13. An anti-drop rod respectively connected to the connecting arm 11 and the suspension arm 13 can also be provided between the ends of the connecting arm 11 and the suspension arm 13 away from the crossbeam 12.

[0043] According to one embodiment of the present application, a waist-shaped mounting hole is respectively provided on the suspension arm 13 and the connecting arm 11, and the connecting shafts 141 on both sides of the pulley are respectively installed in the waist-shaped mounting holes;

[0044] The locking unit includes a locking rod 151 and a cam 152. The cam 152 is arranged in the suspension arm 13 and fixedly connected to the connecting shaft 141. The locking rod 151 includes a locking rod body. The locking rod body extends into the suspension arm 13 and is aligned with the cam 152. When the first pulley 14 is suspended on the cable, the first pulley 14 is forced to move upward so that the cam 152 is in close contact with the end of the locking rod body to achieve locking; when the first pulley 14 is separated from the cable, the first pulley 14 moves downward under the action of its own gravity to separate from the locking rod body to achieve an unlocking head.

[0045] According to one embodiment of the present application, a limit groove is provided at the top of the suspension arm 13, the locking rod body is arranged in the limit groove, and one end of the locking rod body extending into the limit groove is provided with a second limit protrusion; a spring 23 is provided in the limit groove and is sleeved on the locking rod body, and a limit cover is provided at the top of the limit groove to prevent the spring 23 from withdrawing from the limit groove, the top of the locking rod body passes through the limit cover and extends to the outside of the limit cover, and a locking head is provided at the bottom of the locking rod body and extends downward through the bottom wall of the limit groove; the locking head is aligned with the cam 152, and when the first pulley 14 is suspended on the cable, the first pulley 14 is forced to move upward so that the cam 152 is in close contact with the locking head to achieve locking; when the first pulley 14 is detached from the cable, the first pulley 14 moves downward under the action of its own gravity and the spring 23 and the locking rod to detach from the lock to achieve the unlocking head.

[0046] According to one embodiment of the present application, the unlocking unit includes a gear 132 and a movable plate 133 arranged in the suspension arm 13; one end of the movable plate 133 is rotatably connected to the connecting shaft 141 of the first pulley 14 through a bearing; the gear 132 is arranged at one end of the suspension arm 13 away from the locking unit, and the other end of the movable plate 133 extends toward one end of the gear 132. The movable plate 133 is provided with a rack 134 meshing with the gear 132. The gear 132 is connected to a driver, and the driver drives the gear 132 to rotate, and the gear 132 drives the movable plate 133 to drive the connecting shaft 141 of the first pulley 14 away from the locking unit.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A retractable ladder head, characterized in that: It includes a ladder head body, a telescopic assembly, a hanging assembly and the locking and unlocking assembly; The ladder head body comprises two ladder columns arranged in parallel and a step rod unit connected between the two ladder columns, and a soft ladder connector is provided at the bottom end of the ladder column; The hook assembly includes a hook portion and a pulley disposed inside the hook portion; The telescopic assembly is connected between the ladder head body and the hanging assembly, and is used to automatically adjust the height difference between the ladder column and the hanging assembly according to the cable inclination angle; The locking and unlocking assembly is installed on the hook part, and comprises a locking unit for locking the pulley so that the pulley suspended on the line automatically stops rotating, and an unlocking unit for releasing the locking action of the locking unit so that the pulley can rotate.

2. The retractable ladder head according to claim 1, characterized in that: The telescopic assembly includes a fixed rod, a sliding rod, a spring and a steel rope, one end of the fixed rod is fixedly connected to the hook portion, and the other end of the fixed rod is slidably connected to the ladder column; two first sliding grooves arranged opposite to each other are provided on the rod wall of the fixed rod, and the first sliding groove is longitudinally arranged along the rod wall of the fixed rod; two second sliding grooves matching the first sliding groove are provided on the rod wall of the ladder column at one end connected to the fixed rod; the sliding rod transversely penetrates the first sliding groove and the second sliding groove; a first limit block is provided at one end of the fixed rod away from the ladder column, and the spring is connected between the sliding rod and the first limit block; the step rod unit is arranged below the first sliding groove, and the steel rope transversely slides through one of the step rod units, and the two ends of the steel rope respectively extend into the ladder column on the same side and are connected to the corresponding sliding rod, and the steel rope can slide in the step rod unit and the ladder column.

3. The retractable ladder head according to claim 2, characterized in that: The step rod unit includes a first step rod and a third step rod which are sequentially connected between the two ladder columns from top to bottom; the third step rod is slidably penetrated by the steel rope, and both ends of the third step rod are respectively connected to the ladder columns through a third step rod connector, a second pulley matching the steel rope is installed in the third step rod connector, and the steel rope extends from the third step rod into the ladder column along the second pulley.

4. The retractable ladder head according to claim 3, characterized in that: The steel rope is connected to the sliding rod through a steel rope connector; the two ends of the first step rod are respectively connected to the ladder column through a first step rod connector, and the first step rod connector is provided with at least two first limiting protrusions extending into the ladder column, and the gap distance between the two first limiting protrusions is greater than the diameter of the steel rope and less than the width of the connector.

5. The retractable ladder head according to claim 4, characterized in that: A second step rod is provided between the first step rod and the third step rod, and both ends of the second step rod are connected to the ladder column through a second step rod connector respectively; a third pulley is provided in the second step rod connector, and the steel rope slides up and down in the ladder column along the third pulley.

6. The retractable ladder head according to claim 5, characterized in that: The step rod unit also includes a fourth step rod, and both ends of the fourth step rod are respectively connected to the bottom end of the ladder column through a fourth step rod connector.

7. The retractable ladder head according to claim 1, characterized in that: The hook portion includes a connecting arm and a suspension arm and a crossbeam respectively connected to the top of the connecting arm and the top of the suspension arm; the bottom end of the connecting arm is connected to the fixing rod; and the connecting shafts on both sides of the pulley are rotatably connected to the connecting arm and the suspension arm respectively.

8. The retractable ladder head according to claim 1, characterized in that: A waist-shaped mounting hole is respectively provided on the suspension arm and the connecting arm, and the connecting shafts on both sides of the pulley are respectively installed in the waist-shaped mounting holes; The locking unit includes a locking rod and a cam, wherein the cam is arranged in the suspension arm and fixedly connected to the connecting shaft; the locking rod includes a locking rod body, wherein the locking rod body extends into the suspension arm and is aligned with the cam; when the first pulley is suspended on the cable, the pulley is forced to move upward so that the cam is in close contact with the end of the locking rod body; when the first pulley is detached from the cable, the cam moves downward under the action of its own gravity and detaches from the locking rod body.

9. The retractable ladder head according to claim 8, characterized in that: A limiting groove is provided at the top of the suspension arm, the locking rod body is arranged in the limiting groove, and one end of the locking rod body extending into the limiting groove is provided with a second limiting protrusion; a spring is provided in the limiting groove and is sleeved on the locking rod body, and a limiting cover is provided at the top of the limiting groove to prevent the spring from withdrawing from the limiting groove, the top of the locking rod body passes through the limiting cover and extends to the outside of the limiting cover, and a locking head is provided at the bottom of the locking rod body and extends downwardly through the bottom wall of the limiting groove; the locking head is aligned with the cam, and when the first pulley is suspended on the cable, the pulley is forced to move upward so that the cam is in close contact with the locking head; when the first pulley is detached from the cable, the pulley moves downward under the action of its own gravity to detach from the locking head.

10. The retractable ladder head according to claim 8 or 9, characterized in that: The unlocking unit includes a gear and a movable plate arranged in the suspension arm; one end of the movable plate is rotatably connected to the connecting shaft of the first pulley; the gear is arranged at one end of the suspension arm away from the locking unit, and the other end of the movable plate extends toward one end of the gear, and a rack meshing with the gear is provided on the movable plate, and the gear is connected to a driver, and the driver drives the gear to rotate, and the movable plate is driven by the gear to drive the connecting shaft of the first pulley away from the locking unit.

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