Free-falling winch

Abstract

The utility model discloses a free falling winch which comprises a winch rack, a driving motor, a reduction gearbox and a winding drum are fixed to the top face of the winch rack, the driving motor drives the reduction gearbox to operate, a main rotating shaft is movably connected to the middle of the winding drum, and the two ends of the main rotating shaft extend out of the two ends of the winding drum. The two ends of the main rotating shaft are movably connected to supporting bases fixed to the left portion and the right portion of the top face of the winch rack through bearings. A connecting gear disc is arranged on the left side of a left end plate of the winding drum and fixed to the main rotating shaft, an annular body is fixed to the outer side edge of the right side wall of a right end plate of the winding drum, the right portion of the main rotating shaft is located in the annular body, an expansion device is fixed to the main rotating shaft, and the outer side wall of an arc-shaped expansion portion of the expansion device is matched with the inner side wall of the annular body. The main rotating shaft can drive the winding drum to rotate through expansion of the arc-shaped expansion part, the main rotating shaft does not drive the winding drum to rotate through retraction of the arc-shaped expansion part, the winding drum is driven to rotate freely through the steel wire rope, and the structure is simple.

Description

Technical Field:

[0001] The utility model relates to the technical field of hoisting equipment, and more specifically to a free-fall winch. Background Art:

[0002] In some existing rock drilling devices, a steel wire rope is fixed to the top of the hammer head, which is wound around a winding drum. It is necessary to rotate the drum to wind the steel wire rope. When the hammer head hangs naturally, it is necessary to make the steel wire rope output from the drum as the hammer head falls. At this time, the drum does not require a driving structure, but rotates automatically driven by the steel wire rope. In the existing winches, the winding and unwinding of the steel wire rope are both realized by driving the drum to rotate by a motor, and the effect is not ideal.

[0003] There are also some winches with the function of free fall. They install complex mechanical transmission structures inside the drum, with high manufacturing costs, troublesome replacement of damaged parts, and poor effects. Content of the Utility Model:

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a free-fall winch. It can drive the drum to rotate by the main rotating shaft through the expansion of the arc-shaped expansion part, and make the main rotating shaft not drive the drum to rotate through the retraction of the arc-shaped expansion part. The drum rotates freely driven by the steel wire rope, with simple structure, convenient manufacturing and low manufacturing cost.

[0005] The solution of the utility model to solve the above technical problems is:

[0006] A free-fall winch includes a winch frame. A driving motor, a speed reducer and a drum are fixed on the top surface of the winch frame. The driving motor drives the speed reducer to operate. A driving gear is fixed on the output shaft of the speed reducer. The driving gear meshes with a connecting gear disc installed at one side of the drum. The middle part of the drum is movably connected with a main rotating shaft. Both ends of the main rotating shaft extend out of both ends of the drum. Both ends of the main rotating shaft are movably connected to support seats fixed on the left and right parts of the top surface of the winch frame through bearings.

[0007] A connecting gear disc is arranged on the left side of the left end plate of the drum. The connecting gear disc is fixed on the main rotating shaft. An annular body is fixed on the outer side edge of the right side wall of the right end plate of the drum. The right part of the main rotating shaft is located in the annular body, and an expansion device is fixed thereon. The outer side wall of the arc-shaped expansion part of the expansion device is matched with the inner side wall of the annular body.

[0008] An anti-slip layer is fixed on the outer side wall of the arc-shaped expansion part. The outer side wall of the anti-slip layer is pressed against the inner side wall of the annular body.

[0009] The expansion device includes a long fixed plate fixed on the right part of the main rotating shaft. First connecting seats are fixed on the upper part of the front side wall and the lower part of the rear side wall of the long fixed plate. A pressing cylinder is movably connected to the first connecting seat through a hinge shaft. The end of the push rod of the pressing cylinder is movably connected to one end of a tensioning arm through a hinge shaft. The rear part of the front tensioning arm is movably connected to the lower part of the long fixed plate through a hinge shaft, and the front part of the rear tensioning arm is movably connected to the upper part of the long fixed plate through a hinge shaft. Adjusting shafts are installed at the rear end of the front tensioning arm and the front end of the rear tensioning arm. Radially arranged adjusting screws are installed on the adjusting shafts. The rear connecting part of the lower adjusting screw and the front connecting part of the upper adjusting screw are both movably connected to one end of the corresponding arc-shaped expansion part through a hinge shaft. The other end of the arc-shaped expansion part is movably connected to the upper end or the lower end of the long fixed plate through a hinge shaft.

[0010] At the rear side of the upper end of the long fixed plate, an end extension part extending upward is formed. At the front side of the lower end of the long fixed plate, an end extension part extending downward is formed. The upper part of the rear arc-shaped expansion part is movably connected to the end extension part at the upper end of the long fixed plate through a hinge shaft, and the lower part of the rear arc-shaped expansion part is movably connected to the rear end of the lower adjusting screw through a hinge shaft;

[0011] The lower part of the front arc-shaped expansion part is movably connected to the end extension part at the lower end of the long fixed plate through a hinge shaft, and the upper part of the front arc-shaped expansion part is movably connected to the front end of the upper adjusting screw through a hinge shaft.

[0012] The prominent effect of the present utility model is:

[0013] Compared with the prior art, it can drive the reel to rotate by the expansion of the arc-shaped expansion part, and make the main rotating shaft not drive the reel to rotate by the retraction of the arc-shaped expansion part, and drive the reel to rotate freely through the steel wire rope. Its structure is simple, easy to manufacture, and the manufacturing cost is low. Description of the drawings:

[0014] Figure 1 is a partial top view of the present utility model;

[0015] Figure 2 is a partial side view of the present utility model;

[0016] Figure 3 is a partial front view of the present utility model;

[0017] Figure 4 is a partial structural schematic diagram at the expansion device;

[0018] Figure 5 is Figure 4 a partial enlarged view of... Specific implementation manners:

[0019] Example, as shown in Figures 1 to 5 As shown in the figure, a free-fall winch includes a winch frame 10. A driving motor 20, a speed reducer 30, and a drum 40 are fixed on the top surface of the winch frame 10. The output shaft of the driving motor 20 is connected to the input shaft of the speed reducer 30 through a coupling, thereby driving the speed reducer 30 to operate. A driving gear 31 is fixed on the output shaft of the speed reducer 30. The driving gear 31 meshes with the external teeth of a connecting gear disc 50 installed on one side of the drum 40, thereby driving the connecting gear disc 50 to rotate. A main rotating shaft 60 is movably connected to the middle of the drum 40. Both ends of the main rotating shaft 60 extend out of both ends of the drum 40. Both ends of the main rotating shaft 60 are movably connected to support seats 11 fixed on the left and right parts of the top surface of the winch frame 10 through bearings;

[0020] A connecting gear disc 50 is provided on the left side of the left end plate of the drum 40. The connecting gear disc 50 is fixed on the main rotating shaft 60. An annular body 70 is fixed on the outer side edge of the right side wall of the right end plate of the drum 40. The right part of the main rotating shaft 60 is located in the annular body 70, and an expansion device 80 is fixed thereon. The outer side wall of the arc-shaped expansion part 81 of the expansion device 80 cooperates with the inner side wall of the annular body 70.

[0021] An anti-slip layer 82 is fixed on the outer side wall of the arc-shaped expansion part 81. The outer side wall of the anti-slip layer 82 is pressed against the inner side wall of the annular body 70.

[0022] Furthermore, the expansion device 80 includes a long-shaped fixing plate 83 fixed on the right part of the main rotating shaft 60. First connecting seats 84 are fixed on the upper part of the front side wall and the lower part of the rear side wall of the long-shaped fixing plate 83. A pressing cylinder 85 is movably connected to the first connecting seat 84 through a hinge shaft. The end of the push rod of the pressing cylinder 85 is movably connected to one end of a tensioning arm 86 through a hinge shaft. The rear part of the front tensioning arm 86 is movably connected to the lower part of the long-shaped fixing plate 83 through a hinge shaft. The front part of the rear tensioning arm 86 is movably connected to the upper part of the long-shaped fixing plate 83 through a hinge shaft. Adjusting shafts 87 are installed at the rear end of the front tensioning arm 86 and the front end of the rear tensioning arm 86. Adjusting screws 88 arranged radially are installed on the adjusting shafts 87. The rear connecting part of the lower adjusting screw 88 and the front connecting part of the upper adjusting screw 88 are movably connected to one end of the corresponding arc-shaped expansion part 81 through hinge shafts. The other end of the arc-shaped expansion part 81 is movably connected to the upper end or the lower end of the long-shaped fixing plate 83 through a hinge shaft.

[0023] A rear side of the upper end of the elongated fixing plate 83 is formed with an end extension part extending upward, and a front side of the lower end of the elongated fixing plate 83 is formed with an end extension part extending downward. An upper part of the rear arc-shaped expansion part 81 is movably connected to the end extension part of the upper end of the elongated fixing plate 83 through a hinge shaft, and a lower part of the rear arc-shaped expansion part 81 is movably connected to the rear end of the lower adjusting screw 88 through a hinge shaft;

[0024] A lower part of the front arc-shaped expansion part 81 is movably connected to the end extension part of the lower end of the elongated fixing plate 83 through a hinge shaft, and an upper part of the front arc-shaped expansion part 81 is movably connected to the front end of the upper adjusting screw 88 through a hinge shaft.

[0025] Both the left end and the right end inside the middle cylinder of the drum 40 are provided with connecting sleeve bodies 41, and the outer side wall of the connecting sleeve body 41 and the inner side wall of the middle cylinder are fixedly welded through a connecting plate; A middle partition plate is fixedly welded on the middle outer side wall of the middle cylinder of the drum 40. This setting can separate and arrange two steel wire ropes when they are wound around the middle cylinder through the middle partition plate.

[0026] The main rotating shaft 60 is inserted into the two connecting sleeve bodies 41 and is movably connected to the connecting sleeve bodies 41 through bearings.

[0027] A radially extending through hole extending forward and backward is formed at the end of the adjusting shaft 87, the middle part of the adjusting screw 88 is inserted into the radially extending through hole, and both ends of the adjusting screw 88 extend out of both ends of the radially extending through hole and are screwed with adjusting nuts 881;

[0028] Two mutually pressing adjusting nuts 881 are screwed at the rear end of the upper adjusting screw 88. The front end of the front adjusting nut 881 presses against the rear side wall of the adjusting shaft 87. A adjusting nut 881 is screwed at the front part of the upper adjusting screw 88 and a spacer sleeve is sleeved. The spacer sleeve is clamped between the corresponding adjusting nut 881 and the front end face of the adjusting shaft 87; The rear end of the upper adjusting screw 88 is close to the front side wall of the end extension part of the upper part of the elongated fixing plate 83, and the front end of the lower adjusting screw 88 is close to the rear side wall of the end extension part of the lower part of the elongated fixing plate 83.

[0029] The installation methods of the adjusting nuts 881 and the spacer sleeves installed on the lower adjusting screw 88 are opposite to those of the upper adjusting screw 88.

[0030] By rotating the corresponding adjusting nut 881, the distance that the adjusting screw 88 extends out of the front and rear ends of the adjusting shaft 87 can be changed, so as to change the connection distance between the corresponding tensioning arm 86 and the arc-shaped expansion part 81.

[0031] The connecting air pipe sleeves or clamping positions of the two pressing cylinders 85 in this embodiment are on the inner side wall of the central axial through hole of the main rotating shaft 60, and a rotary joint is connected to the outer end of the central axial through hole of the rotating shaft 60. Thus, gas can be introduced into the two pressing cylinders 85 through the air pipe connected to the rotary joint to realize operations such as the pushing of the push rods of the two pressing cylinders 85. This is a conventional structure and will not be elaborated here.

[0032] When in use in this embodiment, when the steel wire rope wound around the reel 40 performs a free-fall motion along with the hammerhead connected to its end, the push rods of the two pressing cylinders 85 retract, causing the two arc-shaped expansion parts 81 to retract, and the outer side wall of the anti-slip layer 82 does not press against the inner side wall of the annular body 70. At this time, the reel 40 rotates automatically along with the output of the steel wire rope.

[0033] When it is necessary to wind the steel wire rope back, through the pushing of the push rods of the two pressing cylinders 85, the two arc-shaped expansion parts 81 expand outwards. At this time, the outer side wall of the anti-slip layer 82 presses against the inner side wall of the annular body 70 to achieve connection. At this time, by rotating the main rotating shaft 60, the annular body 70 will be driven to rotate, and then the reel 40 will be driven to rotate, thereby winding the steel wire rope to achieve winding.

[0034] The structure of this embodiment is simple, easy to manufacture, and has good effects.

[0035] Finally, it should be pointed out that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A free-fall winch, comprising a winch frame (10), a driving motor (20), a speed reducer (30), and a drum (40) fixed on the top surface of the winch frame (10). The driving motor (20) drives the speed reducer (30) to operate. A driving gear (31) is fixed on the output shaft of the speed reducer (30), and the driving gear (31) meshes with a connecting gear disc (50) installed at one side of the drum (40). It is characterized in that: A main rotating shaft (60) is movably connected to the middle part of the drum (40). Both ends of the main rotating shaft (60) extend out of both ends of the drum (40). Both ends of the main rotating shaft (60) are movably connected to support seats (11) fixed on the left and right parts of the top surface of the hoist frame (10) through bearings. A connecting gear disc (50) is provided on the left side of the left end plate of the drum (40). The connecting gear disc (50) is fixed on the main rotating shaft (60). An annular body (70) is fixed on the outer side edge of the right side wall of the right end plate of the drum (40). The right part of the main rotating shaft (60) is located in the annular body (70), and an expansion device (80) is fixed thereon. The outer side wall of the arc-shaped expansion part (81) of the expansion device (80) is matched with the inner side wall of the annular body (70).

2. The free-fall hoist according to claim 1, wherein: An anti-slip layer (82) is fixed on the outer side wall of the arc-shaped expansion part (81). The outer side wall of the anti-slip layer (82) is pressed against the inner side wall of the annular body (70).

3. A free-fall hoist according to claim 1, characterized in that: The expansion device (80) includes a long fixing plate (83) fixed on the right part of the main rotating shaft (60). First connecting seats (84) are fixed on the upper part of the front side wall and the lower part of the rear side wall of the long fixing plate (83). A pressing cylinder (85) is movably connected to the first connecting seat (84) through a hinge shaft. The end of the push rod of the pressing cylinder (85) is movably connected to one end of a tensioning arm (86) through a hinge shaft. The rear part of the front tensioning arm (86) is movably connected to the lower part of the long fixing plate (83) through a hinge shaft. The front part of the rear tensioning arm (86) is movably connected to the upper part of the long fixing plate (83) through a hinge shaft. Adjusting shafts (87) are installed at the rear end of the front tensioning arm (86) and the front end of the rear tensioning arm (86). Radially arranged adjusting screws (88) are installed on the adjusting shafts (87). The rear connecting part of the lower adjusting screw (88) and the front connecting part of the upper adjusting screw (88) are movably connected to one end of the corresponding arc-shaped expansion part (81) through hinge shafts. The other end of the arc-shaped expansion part (81) is movably connected to the upper end or the lower end of the long fixing plate (83) through a hinge shaft.

4. A free-fall hoist according to claim 3, characterized in that: An end extending part extending upward is formed at the rear side of the upper end of the long fixing plate (83). An end extending part extending downward is formed at the front side of the lower end of the long fixing plate (83). The upper part of the rear arc-shaped expansion part (81) is movably connected to the end extending part at the upper end of the long fixing plate (83) through a hinge shaft. The lower part of the rear arc-shaped expansion part (81) is movably connected to the rear end of the lower adjusting screw (88) through a hinge shaft. The lower part of the front arc-shaped expansion part (81) is movably connected to the end extending part at the lower end of the long fixing plate (83) through a hinge shaft. The upper part of the front arc-shaped expansion part (81) is movably connected to the front end of the upper adjusting screw (88) through a hinge shaft.

5. A free-fall hoist according to claim 1, characterized in that: Connecting sleeve bodies (41) are provided inside the left and right ends of the middle cylinder body of the drum (40). The outer side wall of the connecting sleeve body (41) is fixedly welded to the inner side wall of the middle cylinder body through connecting plates. The main rotating shaft (60) is inserted into two connecting sleeve bodies (41) and is movably connected to the connecting sleeve bodies (41) through bearings.

6. A free-fall hoist according to claim 3, characterized in that: At the end of the adjusting shaft (87), a radial through hole extending forward and backward is formed. The middle part of the adjusting screw (88) is inserted into the radial through hole. Both ends of the adjusting screw (88) extend out of both ends of the radial through hole and are screwed with adjusting nuts (881).

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