CN213738355U - Hoisting mechanism for crane - Google Patents
Hoisting mechanism for crane Download PDFInfo
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- CN213738355U CN213738355U CN202022547910.5U CN202022547910U CN213738355U CN 213738355 U CN213738355 U CN 213738355U CN 202022547910 U CN202022547910 U CN 202022547910U CN 213738355 U CN213738355 U CN 213738355U
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- wire rope
- connecting rod
- hoisting mechanism
- proximity switch
- steel wire
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Abstract
The utility model discloses a hoisting mechanism for a crane, which relates to the technical field of hoisting mechanisms of cranes, and comprises a winding drum wrapped with a steel wire rope, a wall frame used for supporting the winding drum, and a spring, wherein one end of the spring is fixed on the wall frame, the other end of the spring is fixed with a compression roller shaft, one end of the compression roller shaft is rotatably connected with a compression roller, and the spring is used for providing initial pre-tightening tension force to ensure that the compression roller is always pressed on the steel wire rope of the winding drum; the middle of the compression roller shaft is connected with one end of a connecting rod, and the other end of the connecting rod is connected with a connecting rod shaft and a detection rod respectively. The utility model provides a two photoelectricity proximity switches are used for detecting hoisting mechanism wire rope respectively and are moving to two extreme position that rise, fall, and photoelectricity proximity switch compares with mechanical type travel switch, and its positioning accuracy, operating frequency, life, installation adjustment's convenience and adaptability to adverse circumstances all are superior to mechanical type.
Description
Technical Field
The utility model relates to a hoist hoisting mechanism technical field especially relates to a hoisting mechanism that hoist was used.
Background
In a crane, the mechanism for lifting or lowering the load is called a hoisting mechanism. The hoisting mechanism is the most important and basic mechanism in the crane, and the working performance of the hoisting mechanism directly influences the working performance of the whole crane.
According to the regulations of hoisting machinery safety regulations, when a hoisting mechanism runs to the extreme positions of ascending and descending, a power source is automatically cut off and the motion is stopped, so that the hoisted goods and the crane are prevented from being damaged. The lifting and lowering limiting device of the existing commonly used crane lifting mechanism is connected with a shaft of a stroke limiter through an output shaft arranged at the tail end of a winding drum, detects the number of running turns of the winding drum through the opening and closing state of a mechanical component in a mechanical stroke switch, and sends an electric signal to control the on-off of a power source, so that the lifting and lowering limiting functions of the lifting mechanism are realized.
The lifting and lowering limiting device of the conventional hoisting mechanism can meet the use requirements of most cranes, but when the lifting and lowering limiting device is used on some special cranes, such as a hydraulic folding arm telescopic hoisting mechanism, the following problems exist:
1, the folding arm telescopic crane has compact design because the storage space is small. The left side of the lifting mechanism is provided with a hydraulic motor, and the right side of the lifting mechanism is provided with a suspension arm. The space on the right side cannot be provided with a stroke limiter.
2, when the lifting limiting device is used for fine operation, due to the problems of dead zones, large hysteresis and the like of mechanical contacts of the stroke limiter, the repeated precision of the lifting limiting set point is not high, and the fine operation is difficult to realize.
3, as long as the hoisting mechanism moves, mechanical components in the stroke limiter, such as gear sets, springs and the like, work, and are easy to fatigue and wear for a long time, so that the stroke limiter needs to be maintained and replaced regularly.
Based on the above three reasons, the conventional lifting and lowering limiting device cannot meet the use requirements of the product lifting mechanism, and therefore a new limiting device needs to be developed to solve the problems.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing a hoisting mechanism for hoist, the convenience is detected hoisting mechanism lift extreme position, conveniently maintains the maintenance, and further easy to assemble just has stronger adaptability.
The purpose of the utility model can be achieved by adopting the following technical scheme:
a hoisting mechanism for a crane comprises a reel wrapped with a steel wire rope and a wall frame for supporting the reel,
the steel wire rope winding drum is characterized by further comprising a spring, one end of the spring is fixed on the wall frame, the other end of the spring is fixed with a compression roller shaft, one end of the compression roller shaft is rotatably connected with a compression roller, and the spring is used for providing initial pre-tightening tension so that the compression roller can be pressed on a steel wire rope of the winding drum all the time;
the middle of the compression roller shaft is connected with one end of a connecting rod, the other end of the connecting rod is connected with a connecting rod shaft and a detection rod respectively, the connecting rod is connected with the connecting rod shaft in a rotating mode, one end of the connecting rod shaft is connected with a seat plate, the seat plate is fixedly connected with a wall frame, a first proximity switch and a second proximity switch are arranged below the wall frame, the first proximity switch is used for detecting the descending preset position of the steel wire rope, and the second proximity switch is used for detecting the ascending preset position of the steel wire rope.
Preferably, the number of the compression rollers is two, the compression rollers are distributed on the left and right, a rolling bearing is arranged between the compression roller shaft and the compression roller, and the detection rod is rigidly connected with the compression roller through the connecting rod.
Preferably, the preset descending position of the steel wire rope and the preset ascending position of the steel wire rope are respectively the limiting descending and ascending positions of the steel wire rope.
Preferably, the link shaft and the seat plate are connected by a cotter pin.
Preferably, still including the mounting panel, the mounting panel with wall frame fixed connection, first proximity switch with second proximity switch is photoelectric proximity switch, and they pass through and emit the nut and fix on the mounting panel.
Preferably, two U-shaped grooves are formed in the side surface of the mounting plate.
The use method of the hoisting mechanism for the crane comprises the following steps
Step A: enabling the hoisting mechanism to normally work to drive the steel wire rope to ascend, enabling the head of the detection rod to be overlapped with the second proximity switch, and stopping the rotation of a winding drum of the hoisting mechanism;
and B: the hoisting mechanism works normally to drive the steel wire rope to descend, the head of the detection rod is overlapped with the first proximity switch, and the winding drum of the hoisting mechanism stops rotating.
Preferably, the specific steps of step A comprise the following steps
a1. In the ascending process of the steel wire rope, more and more steel wire ropes are stored on the winding drum, when the steel wire rope reaches the mth circle of the nth layer, the steel wire rope is at the ascending limit position, and the steel wire rope lifts the compression roller upwards by the diameter of one steel wire rope due to the action of the step on the left compression roller;
a2. the compression roller drives the connecting rod to rotate, the center of the head of the detection rod is coincided with the center of the second proximity switch in the rotating process, the second proximity switch sends an electric signal to the control valve of the lifting mechanism, the control valve cuts off a power source, and the winding drum of the lifting mechanism stops rotating.
Preferably, the specific steps of step B include the following steps
b1. In the descending process of the steel wire rope, less and less steel wire ropes are stored on the winding drum, when the steel wire rope reaches the e-th circle on the d-th layer, the steel wire rope is at the descending limit position, and due to the action of the step on the right-side compression roller, the compression roller moves downwards by the diameter of one steel wire rope under the action of the spring;
b2. the compression roller drives the connecting rod to rotate, the center of the head of the detection rod coincides with the center of the first proximity switch in the rotating process, the first proximity switch sends an electric signal to the control valve of the lifting mechanism, the control valve cuts off a power source, and the winding drum of the lifting mechanism stops rotating.
Preferably, the mth turn of the nth layer is the fourth turn of the second layer, and the mth turn of the mth layer is the third turn of the first layer.
The utility model has the advantages of:
1. the utility model provides a two photoelectricity proximity switches are used for detecting hoisting mechanism wire rope respectively and are moving to two extreme position that rise, fall, and photoelectricity proximity switch compares with mechanical type travel switch, and its positioning accuracy, operating frequency, life, installation adjustment's convenience and adaptability to adverse circumstances all are superior to mechanical type.
2. The utility model provides a photoelectric proximity switch directly detects hoisting mechanism lift extreme position, and the detection position is accurate, and repeatability is high, and the measuring arm is installed on hoisting mechanism reel compression roller device, and the compression roller can be regarded as reel rope pressing device simultaneously, prevents wire rope disorder and deviates from; by adopting the photoelectric proximity switch, no mechanical component is arranged inside, and no abrasion and fatigue exist, so that the photoelectric proximity switch is beneficial to maintenance and has long service life.
Drawings
Fig. 1 is a front view schematic diagram of an embodiment in accordance with the present invention;
fig. 2 is a schematic side view of an embodiment according to the present invention.
In the figure: 101-wall frame, 102-winding drum, 2-spring, 3-compression roller shaft, 4-compression roller, 7-connecting rod shaft, 8-seat plate, 9-first proximity switch, 10-second proximity switch, 11-connecting rod, 12-detection rod and 13-mounting plate.
Detailed Description
In order to make the technical solutions of the present invention clearer and clearer for those skilled in the art, the present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1-2, the hoisting mechanism for a crane provided in this embodiment includes a drum 102 wrapped with a steel wire rope, a wall frame 101 for supporting the drum 102, a motor, a speed reducer, and other components,
the wire rope winding device is characterized by further comprising a spring 2, one end of the spring 2 is fixed on the wall frame 101, the other end of the spring 2 is fixed with a compression roller shaft 3, one end of the compression roller shaft 3 is rotatably connected with a compression roller 4, and the spring 2 is used for providing initial pre-tightening tension so that the compression roller 4 is always pressed on a wire rope of the winding drum 102 and the wire rope is prevented from being disordered and jumping;
the intermediate junction of compression roller axle 3 has the one end of connecting rod 11, the other end of connecting rod 11 is connected with connecting rod axle 7 and detection pole 12 respectively, and connecting rod 11 rotates with connecting rod axle 7 and is connected, connecting rod 11 uses the connecting rod axle to move as the centre of a circle, the one end of connecting rod axle 7 is connected with bedplate 8, bedplate 8 and wall frame 101 fixed connection, the below of wall frame 101 is provided with first proximity switch 9 and second proximity switch 10, first proximity switch 9 is used for detecting wire rope's decline preset position, second proximity switch 10 is used for detecting wire rope's the ascending preset position.
In this embodiment, as shown in fig. 1, two compression rollers 4 are provided, and they are distributed left and right, the centers of the left and right compression rollers 4 are raised or lowered along with the change of the number of layers of the steel wire rope of the hoisting mechanism, the head of the detection rod 12 rotates around the center of the connecting rod shaft 7 along with the change of the number of layers of the steel wire rope due to the action of the connecting rod 11, a rolling bearing is provided between the compression roller shaft 3 and the compression roller 4, when the steel wire rope is wound and unwound, the compression roller 4 rotates synchronously with the steel wire rope under the action of the rolling bearing 5, so as to reduce the abrasion to the steel wire rope, and the detection rod 12 is rigidly connected with the compression roller 4 through the connecting rod 11.
In the present embodiment, as shown in fig. 1, the preset descending position and the preset ascending position of the wire rope are the extreme positions of the descending and ascending of the wire rope, respectively, and cannot ascend again or cannot descend again to the extreme positions.
In the present embodiment, as shown in fig. 1, the link shaft 7 and the seat plate 8 are connected by a cotter pin.
In this embodiment, as shown in fig. 1, the proximity switch further includes a mounting plate 13, the mounting plate 13 is fixedly connected to the wall frame 101, the first proximity switch 9 and the second proximity switch 10 are both photoelectric proximity switches, and they are fixed to the mounting plate 13 through nuts, and compared with a mechanical travel switch, the photoelectric proximity switch has better positioning accuracy, operating frequency, service life, convenience for installation and adjustment, and adaptability to severe environments than the mechanical travel switch.
In this embodiment, as shown in fig. 2, two U-shaped grooves are formed on the side surface of the mounting plate 13, and the two proximity switches are respectively placed in the corresponding U-shaped grooves, so that the trigger points of the proximity switches can be accurately adjusted.
The use method of the hoisting mechanism for the crane comprises the following steps
Step A: enabling the hoisting mechanism to normally work to drive the steel wire rope to ascend, enabling the head of the detection rod 12 to coincide with the second proximity switch 10, and stopping the rotation of the hoisting mechanism winding drum 102;
and B: the hoisting mechanism works normally to drive the steel wire rope to descend, the head of the detection rod 12 is overlapped with the first proximity switch 10, and the hoisting mechanism winding drum 102 stops rotating.
In this embodiment, as shown in fig. 1, the specific steps of step a include the following steps
a1. In the ascending process of the steel wire rope, more and more steel wire ropes are stored on the winding drum 102, when the steel wire rope reaches the mth circle of the nth layer, the steel wire rope is at the ascending limit position, and the steel wire rope lifts the compression roller 4 upwards by the diameter of one steel wire rope due to the action of the step on the compression roller 4 on the left side;
a2. the compression roller 4 drives the connecting rod 11 to rotate, in addition, the center of the head of the detection rod 12 is overlapped with the center of the second proximity switch 10 in the rotating process, the second proximity switch 10 sends an electric signal to a hoisting mechanism control valve, the control valve cuts off a power source, and the hoisting mechanism winding drum 102 stops rotating.
In this embodiment, as shown in fig. 1, the specific steps of step B include the following steps
b1. In the descending process of the steel wire rope, less and less steel wire ropes are stored on the winding drum 102, when the steel wire rope reaches the e-th circle on the d-th layer, the steel wire rope is at the descending limit position, and due to the step action on the right compression roller 4, the compression roller 4 moves downwards by the diameter of one steel wire rope under the action of the spring 2;
b2. the compression roller 4 drives the connecting rod 11 to rotate, in addition, the center of the head of the detection rod 12 is overlapped with the center of the first proximity switch 9 in the rotating process, the first proximity switch 9 sends an electric signal to a lifting mechanism control valve, the control valve cuts off a power source, and the winding drum 102 of the lifting mechanism stops rotating.
In this embodiment, as shown in fig. 1, the mth turn of the nth layer is the fourth turn of the second layer, the mth turn of the d-th layer is the third turn of the first layer, and when the steel wire rope reciprocates between the two limit points of lifting and lowering, the change in the height of the press roller 4 does not trigger the two proximity switches to operate, so that the hoisting mechanism can operate normally. The different positions of the lifting and the descending limit can be adjusted by changing the widths of different steps of the left and the right compression rollers 4.
The above description is only a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can replace or change the technical solution and the concept of the present invention within the scope of the present invention.
Claims (6)
1. A hoisting mechanism for a crane, comprising a drum (102) wrapped with a wire rope and a wall frame (101) for supporting the drum (102), characterized in that:
the wall frame is characterized by further comprising a spring (2), one end of the spring (2) is fixed on the wall frame (101), the other end of the spring (2) is fixed with a pressing roll shaft (3), one end of the pressing roll shaft (3) is rotatably connected with a pressing roll (4), and the spring (2) is used for providing initial pre-tightening tension so that the pressing roll (4) is pressed on a steel wire rope of the winding drum (102) all the time;
the middle of compression roller axle (3) is connected with the one end of connecting rod (11), the other end of connecting rod (11) is connected with connecting rod axle (7) and detection pole (12) respectively, just connecting rod (11) with connecting rod axle (7) rotate to be connected, the one end of connecting rod axle (7) is connected with bedplate (8), bedplate (8) with wall frame (101) fixed connection, the below of wall frame (101) is provided with first proximity switch (9) and second proximity switch (10), position is predetermine in the decline that first proximity switch (9) are used for detecting wire rope, position is predetermine in the rise that second proximity switch (10) are used for detecting wire rope.
2. A hoisting mechanism for a crane according to claim 1, characterized in that: the two compression rollers (4) are distributed left and right, rolling bearings are arranged between the compression roller shafts (3) and the compression rollers (4), and the detection rod (12) is rigidly connected with the compression rollers (4) through the connecting rod (11).
3. A hoisting mechanism for a crane according to claim 1, characterized in that: the descending preset position of the steel wire rope and the ascending preset position of the steel wire rope are respectively the descending limit position and the ascending limit position of the steel wire rope.
4. A hoisting mechanism for a crane according to claim 1, characterized in that: the connecting rod shaft (7) and the seat plate (8) are connected through a cotter pin.
5. A hoisting mechanism for a crane according to claim 1, characterized in that: still including mounting panel (13), mounting panel (13) with wall frame (101) fixed connection, first proximity switch (9) with second proximity switch (10) are photoelectric proximity switch, and they pass through and emit the nut to be fixed on mounting panel (13).
6. A hoisting mechanism for a crane as claimed in claim 5, wherein: two U-shaped grooves are formed in the side face of the mounting plate (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022547910.5U CN213738355U (en) | 2020-11-06 | 2020-11-06 | Hoisting mechanism for crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022547910.5U CN213738355U (en) | 2020-11-06 | 2020-11-06 | Hoisting mechanism for crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213738355U true CN213738355U (en) | 2021-07-20 |
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ID=76820761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022547910.5U Active CN213738355U (en) | 2020-11-06 | 2020-11-06 | Hoisting mechanism for crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213738355U (en) |
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2020
- 2020-11-06 CN CN202022547910.5U patent/CN213738355U/en active Active
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