CN111204660A - Method for lowering and moving hydraulic lifter under load - Google Patents
Method for lowering and moving hydraulic lifter under load Download PDFInfo
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- CN111204660A CN111204660A CN202010042909.9A CN202010042909A CN111204660A CN 111204660 A CN111204660 A CN 111204660A CN 202010042909 A CN202010042909 A CN 202010042909A CN 111204660 A CN111204660 A CN 111204660A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
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Abstract
The invention provides a method for lowering and moving a hydraulic lifter with load, which mainly comprises the following steps: lowering the main lifting oil cylinder from the top end to the bottom end of the stroke, then lifting to a near-bottom position, controlling a lower anchorage device to engage the steel strand at the near-bottom position, and loosening the steel strand by an upper anchorage device; and lowering the main lift cylinder from the bottom-near position to the bottom end of the stroke. The main lift cylinder is precisely positioned at the near-bottom position because the main lift cylinder needs to be lifted against the gravity of the load when lifted from the bottom to the near-bottom position. Therefore, the hydraulic lifter can smoothly enable the lower anchor to engage with the steel strand at the position close to the bottom, the upper anchor loosens the steel strand, and the main lifting oil cylinder and the upper anchor ascend in a no-load mode to perform a circulating action to drive the load to descend. Therefore, the problems that the hydraulic lifter cannot smoothly complete the conversion of the upper anchorage device and the lower anchorage device and smoothly descend with load only through the control of the method are solved.
Description
Technical Field
The invention relates to the technical field of hydraulic lifters, in particular to a method for lowering and moving a hydraulic lifter under load
Background
With the rapid development of building construction technology, in the aspect of hoisting and hoisting construction, a large-tonnage structure is encountered, a steel strand and a hydraulic lifter are utilized, a computer control system is matched, and a large number of hydraulic lifters are controlled simultaneously, so that the construction process for realizing integral synchronous lifting is more and more mature, and numerous successful cases are provided in China.
The hydraulic lifter drives the upper anchorage device to lift together through the action of the main lifting oil cylinder, so that the loaded lifting function is realized. In the lifting process, the upper anchorage device bites the steel strand tightly, the lower anchorage device loosens the steel strand, when the main lifting oil cylinder rises, the main lifting oil cylinder drives the upper anchorage device and the steel strand tightly bitten by the upper anchorage device to lift together, when the main lifting oil cylinder reaches a position close to the top, the lower anchorage device bites the steel strand tightly, the upper anchorage device is loosened, the main lifting oil cylinder descends in an idle load mode, and then the second cycle can be carried out, and the loading lifting of the hydraulic lifter can be achieved in a repeated mode. In the descending process, the upper anchorage device bites the steel stranded wires tightly, the lower anchorage device loosens the steel stranded wires, when the main lifting oil cylinder descends, the main lifting oil cylinder drives the upper anchorage device and the steel stranded wires tightly bitten with the upper anchorage device to descend together, when the main lifting oil cylinder reaches the position close to the bottom, the lower anchorage device bites the steel stranded wires tightly, the upper anchorage device loosens, the main lifting oil cylinder ascends in a no-load mode, and then the second cycle can be carried out, and the loading lifting of the hydraulic lifter can be achieved in a repeated mode.
At present, in the actual application process, because the gravity of the load is usually large, when the hydraulic lifter is lowered with the load, because the main lifting oil cylinder of the hydraulic lifter moves downwards and is consistent with the gravity direction of the load, the positioning precision of the main lifting oil cylinder is reduced, the main lifting oil cylinder cannot stop at the position close to the bottom with high precision, and the main lifting oil cylinder often directly descends to the bottom, so that the lower anchorage device has no space and capability for converting the anchorage device, and the gravity of the load cannot be converted to the lower anchorage device. Therefore, the main lift cylinder cannot be smoothly reset in no-load mode, and the cycle operation is carried out, so that the load is driven to descend.
Particularly, when a hydraulic lifting system is formed by a plurality of hydraulic lifters to perform load-carrying descending operation, due to the reasons and the difference in internal resistance of the lifters among different hydraulic lifters, when the hydraulic lifting system performs load-carrying descending operation, the positions of the main lifting cylinders of each hydraulic lifter may be different, and as long as the main lifting cylinder of one hydraulic lifter directly descends to the bottom, the lower anchor cannot be converted after losing the space and the capability of converting the anchor, and further the whole system cannot normally perform load-carrying descending operation.
Therefore, the existing method can not smoothly complete the conversion of the upper anchorage and the lower anchorage only by means of control in the load descending process of the hydraulic lifter, so that the hydraulic lifter can not smoothly perform the load descending operation.
Disclosure of Invention
The invention aims to provide a method for lowering and moving a hydraulic lifter with load, which aims to solve the problems that the hydraulic lifter cannot smoothly complete the conversion of an upper anchorage device and a lower anchorage device and smoothly lower with load.
In order to solve the technical problem, the invention provides a load-carrying descending method of a hydraulic lifter, wherein the hydraulic lifter comprises an upper anchorage device, a main lifting oil cylinder, a lower anchorage device and a steel strand, the upper anchorage device moves along with the movement of the main lifting oil cylinder, one end of the steel strand is used for connecting a load, and the other end of the steel strand sequentially penetrates through the lower anchorage device, the main lifting oil cylinder and the upper anchorage device, and the method is characterized by comprising the following steps: the main lifting oil cylinder is lowered from the top end to the bottom end of the stroke and then is lifted to a position close to the bottom, the lower anchorage is controlled to engage the steel strand at the position close to the bottom, and the upper anchorage releases the steel strand; and lowering the main lift cylinder from the bottom-near position to the bottom end of the stroke.
Optionally, all the hydraulic lifters perform the method synchronously by a plurality of the hydraulic lifters descending with load.
In order to solve the technical problem, the invention provides a method for the on-load movement of a hydraulic lifter, wherein the hydraulic lifter comprises an upper anchorage device, a main lifting oil cylinder, a lower anchorage device and a steel strand, the upper anchorage device moves along with the movement of the main lifting oil cylinder, one end of the steel strand is used for connecting a load, and the other end of the steel strand sequentially penetrates through the lower anchorage device, the main lifting oil cylinder and the upper anchorage device, and the method is characterized by comprising the following steps:
s10, lifting the main lifting oil cylinder to a near-top position, controlling the upper anchorage device to engage the steel strand at the near-top position, and loosening the steel strand by the lower anchorage device so as to lift the steel strand to the top end of the stroke;
s11, lowering the main lifting oil cylinder from the top end to the bottom end of the stroke, then lifting to a near-bottom position, controlling the lower anchor to engage the steel strand at the near-bottom position, and loosening the steel strand by the upper anchor;
and S12, lowering the main lift cylinder from the bottom-approaching position to the bottom end of the stroke.
Optionally, after the step S12, the method further includes: steps S10 to S12 are repeated.
Optionally, all the hydraulic lifters perform the steps S10 to S12 synchronously by the loading motion of the plurality of hydraulic lifters.
Optionally, the method for the loaded movement of the hydraulic lifter further includes: and after the hydraulic lifters work in an accumulated mode for a set stroke, leveling the plurality of hydraulic lifters.
Optionally, in the method for the loaded movement of the hydraulic lifter, the leveling method includes: measuring the attitude of the load; and adjusting the position of each main lifting oil cylinder according to the posture of the load until the load is in a horizontal posture.
Optionally, in the method of loaded movement of the hydraulic lifters, the movement of all the hydraulic lifters is controlled by the same controller.
Optionally, in the method for on-load movement of the hydraulic lifters, each hydraulic lifter includes a position sensor, the position sensor is used for measuring the position of the master lift cylinder, and the method for adjusting the position of each master lift cylinder includes: feeding back the position of the main lifting oil cylinder to the controller through the position sensor; and the controller adjusts the position of the corresponding main lifting oil cylinder according to the position information fed back by each position sensor.
Optionally, in the method for carrying out the loading movement of the hydraulic lifter, the position sensor is a pull wire sensor.
The hydraulic lifter load-carrying descending method provided by the invention is characterized in that the main lifting oil cylinder is descended from the top end to the bottom end of the stroke, then ascends to a near-bottom position, the lower anchor is controlled to engage the steel strand at the near-bottom position, and the upper anchor releases the steel strand. The main lifting oil cylinder is lowered to the bottom end position through the stroke limit of the main lifting oil cylinder, so that the main lifting oil cylinder can be completely lowered to the bottom; when the main lifting oil cylinder rises from the bottom to the near-bottom position, the main lifting oil cylinder needs to overcome the gravity of the load to rise due to the fact that the acting direction of the main lifting oil cylinder is opposite to the gravity direction of the load, so that the main lifting oil cylinder can be accurately positioned at the near-bottom position, and then the anchorage device can be smoothly switched; when the lower anchorage device engages with the steel strand and the upper anchorage device loosens the steel strand, the main lifting oil cylinder is lowered to the bottom end of the stroke from the position close to the bottom, and the lower anchorage device is tightly engaged with the steel strand under the action of the main lifting oil cylinder, so that the lower anchorage device completely bears the weight of the load, and the main lifting oil cylinder can drive the upper anchorage device to lift in an idle load manner. Therefore, the problem that the hydraulic lifter cannot smoothly complete the conversion of the upper anchorage device and the lower anchorage device and can smoothly control the load descending only by the method is solved.
According to the method for the on-load movement of the hydraulic lifter, the main lifting oil cylinder is lifted to a near-top position, the upper anchorage device is controlled to engage the steel strand at the near-top position, and the lower anchorage device loosens the steel strand so as to lift the steel strand to the top end of the stroke. At the moment, the upper anchorage device bites the steel strand tightly, so that the upper anchorage device completely bears the weight of the load, and the main lifting oil cylinder can drive the upper anchorage device to descend with the load on the steel strand. And then the load is lowered by using the load lowering method of the hydraulic lifter provided by the invention. The hydraulic lifter can smoothly descend under load by repeated operation, and the problem that the hydraulic lifter cannot smoothly complete the conversion of the upper anchorage device and the lower anchorage device and can smoothly descend under load only through the control of the method is solved.
Drawings
FIG. 1 is a schematic structural view of a main lift cylinder of a hydraulic lifter in a top position;
FIG. 2 is a schematic structural view of a main lift cylinder of the hydraulic lifter in a near-bottom position;
FIG. 3 is a schematic structural view of a main lift cylinder of the hydraulic lifter at a bottom end position;
FIG. 4 is a flow chart of a method of on-load movement of a hydraulic lifter;
FIG. 5 is a schematic view of a hydraulic lifter in connection with a load;
FIG. 6 is a control flow chart of the synchronous lowering operation of the hydraulic lifter;
wherein the reference numerals are as follows:
10-load; 11-a hoisting point spreader; 12-temporary support;
20-a hydraulic lifter; 21-a main lift cylinder; 22-an upper anchorage device; 23-lower anchorage; 24-steel strand wires; 25-lifting the support frame;
220-upper anchor ring; 221-upper anchor sheet; 222-an upper platen; 230-lower anchor ring; 231-lower anchor sheet; 232-a lower pressing plate;
Detailed Description
The method for loaded lowering of a hydraulic lifter according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
The hydraulic lifter used in the present embodiment includes: an upper anchorage 22, a main lift cylinder 21, a lower anchorage 23 and a steel strand 24. The upper anchorage device 22 moves along with the movement of the main lifting oil cylinder 21, one end of the steel strand 24 is used for connecting a load 10, and the other end of the steel strand 24 sequentially penetrates through the lower anchorage device 23, the main lifting oil cylinder 21 and the upper anchorage device 22. The upper anchorage device 22 comprises an upper anchorage ring 220, an upper anchorage piece 221, an upper pressure plate 222 and an upper anchorage device oil cylinder; the lower anchor device 23 comprises a lower anchor ring 230, a lower anchor sheet 231, a lower pressure plate 232 and a lower anchor oil cylinder. The hydraulic lifter is constructed as shown in fig. 1.
Wherein the upper anchorage 22 has two states: and (4) occlusion and release. Correspondingly, the lower anchorage 23 also has two states: loosening and biting. The occlusion state of the anchorage device is a state that the anchor sheet part is embedded into the anchor ring by the pressure plate under the action of the anchorage device oil cylinder; the loosening state of the anchorage device is a state that the anchor sheet part is pulled out of the anchor ring by the pressing plate under the action of the anchorage device oil cylinder.
The main lift cylinder of the hydraulic lifter used in this embodiment has 4 position states, which are top end, near top, near bottom, and bottom end, respectively. The top end refers to the highest position of the stroke of the main lift cylinder; the near top is a position of the main lifting oil cylinder, which is a certain distance away from the top end position, and the position can smoothly complete the conversion of the anchorage device; the bottom end refers to the lowest position of the stroke of the main lift cylinder; the near bottom is the position of the main lifting oil cylinder away from the bottom end by a certain distance, and the position can smoothly complete the conversion of the anchorage device.
As shown in fig. 1 to 3, the method for lowering a hydraulic lifter with load provided by this embodiment is to lower the main lift cylinder 21 from the top end to the bottom end of the stroke, then raise the main lift cylinder to a near-bottom position, control the lower anchorage 23 to engage with the steel strand 24 at the near-bottom position, and release the steel strand 24 by the upper anchorage 22; lowering the master lift cylinder 21 from the near bottom position to the bottom end of the stroke.
As shown in fig. 1, when the main lift cylinder 21 is at the top end, the upper anchor piece 221 is completely embedded in the upper anchor ring 220, and the weight of the load 10 is completely borne by the upper anchor 22; the lower anchor sheet 231 is separated from the lower anchor ring 230.
The main lifting cylinder 21 is lowered from the top end to the bottom end by utilizing the stroke limit of the main lifting cylinder 21, so that the main lifting cylinder 21 can be ensured to be completely lowered to the bottom without partial condition of not lowering to the bottom.
When the main lifting cylinder 21 is lifted from the bottom end to a position close to the bottom end, as shown in fig. 2, the lower anchor cylinder is controlled to drive the lower pressing plate 232 to move towards the lower anchor ring 230, so that the lower anchor sheet 231 is partially embedded in the lower anchor ring 230, and the lower anchor 23 engages with the steel strand 24; and then controlling the upper anchorage device oil cylinder to drive the upper pressure plate 222 to move in the opposite direction of the upper anchor ring 220, so that the upper anchor sheet 221 is partially pulled out of the upper anchor ring 220, and the upper anchorage device 22 is loosened from the steel strand 24. The weight of the load 10 is now shared by the upper anchorage 22 and the lower anchorage 23.
When the main lift cylinder 21 descends from the bottom-near position to the bottom end of the stroke, as shown in fig. 3, because the main lift cylinder 21 moves downward, the lower pressing plate 232 completely embeds the lower anchor sheet 231 into the lower anchor ring 230 under the action of the main lift cylinder 21, so that the lower anchor 23 bites the steel strand 24, and the weight of the load 10 is completely borne by the lower anchor 23; at this time, the upper anchor piece 221 and the upper anchor ring 220 are separated.
By lifting the main lifting cylinder 21 from the bottom position to the near bottom position, the main lifting cylinder 21 is lifted upwards in the action direction opposite to the gravity direction of the load 10, and the fine positioning of the main lifting cylinder 21 is realized by overcoming the lifting mode of the gravity of the load, so that the main lifting cylinder 21 can be accurately positioned at the near bottom position, the anchorage device conversion can be smoothly carried out, and the load descending can be smoothly carried out.
Further, all the hydraulic lifters perform the method synchronously by a plurality of the hydraulic lifters descending with load. This makes it possible to satisfy the load lowering work in the case of a large load.
Based on the above hydraulic lifter, as shown in fig. 4, the embodiment further provides a method for loading movement of the hydraulic lifter, where the method includes:
s10, lifting the main lifting oil cylinder 21 to a near-top position, controlling the upper anchorage device 22 to engage the steel strand at the near-top position, and loosening the steel strand 24 by the lower anchorage device 23 to further lift to the top end of the stroke;
s11, lowering the main lift cylinder 21 from the top end to the bottom end of the stroke, then lifting to a near-bottom position, controlling the lower anchorage 23 to engage the steel strand 24 at the near-bottom position, and loosening the steel strand 24 by the upper anchorage 22;
and S12, lowering the main lift cylinder 21 from the bottom-near position to the bottom end of the stroke.
The anchorage device can be converted at the position close to the top of the main lifting oil cylinder 21. At this time, the upper anchorage device oil cylinder is controlled to move the upper pressure plate 222 in the direction of the upper anchor ring 220, so that the upper anchor sheet 221 is partially embedded in the upper anchor ring 220, and the upper anchorage device 22 is engaged with the steel strand 24; and then controlling the lower anchorage device oil cylinder to drive the lower pressing plate 232 to move towards the opposite direction of the lower anchor ring 230, so that the lower anchor sheet 231 is partially pulled out of the lower anchor ring 230, and the lower anchorage device 23 is further enabled to loosen the steel strand 24. The weight of the load 10 is now shared by the upper anchorage 22 and the lower anchorage 23.
Then, the main lift cylinder 21 is lifted to a top end position, at this time, due to the action of the main lift cylinder 21, the upper anchor sheet 221 is completely embedded into the upper anchor ring 220, so that the upper anchor 22 bites the steel strand 24, and at this time, the weight of the load 10 is completely borne by the upper anchor 22; at this time, the lower anchor sheet 231 is separated from the lower anchor ring 230.
Steps S11 to S12 are the same as the method for lowering the hydraulic lifter with load, and are not described herein again.
Further, after the step S12, the load 10 can be continuously lowered by the continuous operation of the hydraulic lifter by repeating the above steps S10 to S12.
Further, all the hydraulic lifters perform the steps S10 to S12 in synchronization with each other by the loading motion of the plurality of hydraulic lifters. The movement of a heavy load can be accomplished by the loaded movement of a plurality of said hydraulic lifters.
Still further, the movement of all of the hydraulic lifters is controlled by the same controller. This facilitates control of the synchronous operation of a plurality of said hydraulic lifters.
Next, the present embodiment takes a plurality of hydraulic lifters to perform loading movement as an example, and a complete flow of the loading movement is described.
It is assumed that the load 10 is connected to the lower anchorage 23 and is suspended.
In this embodiment, a load is placed at a high altitude in a temporary support manner, specifically, as shown in fig. 5, the load 10 is placed on a temporary support 12, and a lifting point hanger 11 is placed on the load 10; a lifting support frame 25 is arranged directly above each spreader 11, said lifting support frame 25 should be about 1.5 meters or more above said load 10; the hydraulic lifter 20 is installed on the lifting support frame 25, the center of the hydraulic lifter 20 is coincided with the center of the lifting appliance 11, and the lifting appliance 11 and the hydraulic lifter 20 are connected through the steel strand 24.
The connection of the load 10 to the hydraulic hoist 20 is well known to those skilled in the art and uses tools including, but not limited to, a lifting point spreader, wire ropes, and seed anchors.
When all the hydraulic lifters 20 are properly connected with the load 10, the hydraulic lifters 20 suspend the load 10 in a synchronous lifting mode, and when the load 10 is suspended, the hydraulic lifters stop operating through the controller, and the temporary supports 12 are removed. When the temporary support 12 is completely removed and the descending path is confirmed to be smooth, the controller can be switched to synchronous descending operation, and the controller is started to enable the lifter to perform descending operation.
Fig. 6 is a control flowchart showing the synchronous lowering operation of the hydraulic lifter. The following describes a flow of the synchronous lowering operation of the hydraulic lifter controlled by the controller with reference to fig. 6.
The controller controls the action of the lower anchor oil cylinder to drive the lower pressing plate 232 to move towards the direction of the lower anchor ring 230, so that the lower anchor sheet 231 is partially embedded in the lower anchor ring 230, the lower anchor device 23 is further used for tightly gripping the steel strand 24, then the action of the upper anchor oil cylinder is controlled to drive the upper pressing plate 222 to move towards the opposite direction of the upper anchor ring 220, the upper anchor sheet 221 is partially pulled out of the upper anchor ring 220, and the upper anchor device 22 is further used for loosening the steel strand. The weight of the load 10 is now shared by the upper anchorage 22 and the lower anchorage 23.
Then, the controller controls the master lift cylinder 21 to descend. Due to the continuous descending of the main lift cylinder 21, the lower pressure plate 232 is pressed to move towards the direction of the lower anchor ring 230, so that the lower anchor sheet 231 is gradually embedded in the lower anchor ring 230, and the upper anchor sheet 221 is gradually separated from the upper anchor ring 220 in the descending process of the main lift cylinder 21 of the upper anchor 22. When the main lift cylinder 21 is lowered to the bottom end, the lower anchor piece 231 is completely embedded in the lower anchor ring 230, the lower anchor 23 completely bites the steel strand 24, the upper anchor piece 221 is completely separated from the upper anchor ring 220, and the upper anchor 22 completely loosens the steel strand 24. At this time, the weight of the load 10 is completely borne by the lower anchorage 23.
And the controller controls the main lifting oil cylinder 21 to ascend so that the main lifting oil cylinder is at a position close to the top. The controller controls the upper anchorage device oil cylinder to drive the upper pressure plate 222 to move towards the upper anchor ring 220, so that the upper anchor piece 221 is partially embedded in the upper anchor ring 220, and the upper anchorage device 22 bites the steel strand 24; and then controlling the lower anchor tool oil cylinder to act to drive the lower pressing plate 232 to move towards the opposite direction of the lower anchor ring 230, so that the lower anchor sheet 231 is partially pulled out of the lower anchor ring 230, and the lower anchor tool 23 loosens the steel strand. The weight of the load 10 is now shared by the upper anchorage 22 and the lower anchorage 23.
And then the controller controls the main lift cylinder 21 to ascend. Due to the continuous rising of the main lifting cylinder 21, the upper anchorage 22 rises together with the steel strand 24. The lifting of the steel strand 24 drives the lower anchor sheet to move in the opposite direction of the lower anchor ring 230, and meanwhile, the pressure exerted on the lower pressing plate 232 by the main lifting oil cylinder 21 is gradually reduced, so that the lower anchor sheet 231 is gradually pulled out of the lower anchor ring 230; in the process that the upper anchorage device 22 ascends along with the main lift cylinder 21, the upper anchor ring 220 and the upper pressure plate 222 are continuously extruded, so that the upper anchor sheet 221 is gradually embedded into the upper anchor ring 220. When the main lift cylinder 21 rises to the top, the upper anchor piece 221 is completely embedded in the upper anchor ring 220, the upper anchor 22 completely bites the steel strand 24, the lower anchor piece 231 is completely separated from the lower anchor ring 230, and the lower anchor 23 completely loosens the steel strand 24. At this point, the weight of the load 10 is borne entirely by the upper anchorage 22.
And then, the controller controls the main lift cylinder 21 to descend to the bottom end. At this time, the controller will first determine whether the load 10 is lowered to the right position, and if so, the operation is ended. And if the main lifting cylinder 21 needs to descend, the controller controls the main lifting cylinder 21 to ascend to the near-bottom position. Then, the controller controls the lower anchorage device oil cylinder to drive the lower pressing plate 232 to move towards the direction of the lower anchor ring 230, so that the lower anchor sheet 231 is partially embedded in the lower anchor ring 230, and the lower anchorage device 23 is engaged with the steel strand 24; and then controlling the upper anchorage device oil cylinder to drive the upper pressure plate 222 to move in the opposite direction of the upper anchor ring 220, so that the upper anchor sheet 221 is partially pulled out of the upper anchor ring 220, and the upper anchorage device 22 is loosened from the steel strand 24. The weight of the load 10 is now shared by the upper anchorage 22 and the lower anchorage 23.
And then the main lift cylinder 21 is controlled by the controller to descend to the bottom end. As the main lift cylinder 21 moves downwards, the lower pressing plate 232 completely embeds the lower anchor sheet 231 into the lower anchor ring 230 under the action of the main lift cylinder 21, so that the lower anchorage 23 bites the steel strand 24, and the weight of the load 10 is completely borne by the lower anchorage 23; at this time, the upper anchor piece 221 and the upper anchor ring 220 are separated.
And then, the controller controls the main lifting oil cylinder 21 to ascend, and the steps are repeated, so that the hydraulic lifter 20 drives the load 10 to descend until the load 10 descends to a required position.
Further, after the hydraulic lifters work in an accumulated mode for a set stroke, leveling is carried out on the plurality of hydraulic lifters. This ensures that the hydraulic lifter is stressed evenly during the descent of the load 10, and at the same time ensures that the load 10 remains level without the risk of overturning.
Still further, the leveling method comprises: measuring the attitude of the load 10; and adjusting the position of each main lifting oil cylinder 21 according to the posture of the load 10 until the load 10 is in a horizontal posture. For example, after 25 strokes of the load 10 are accumulated, the attitude of the load 10 is measured, the position of each master lift cylinder 21 is adjusted by the control of the controller, and the measurement and the attitude adjustment are repeated for a plurality of times, so that the load 10 assumes a horizontal attitude.
Still further, the hydraulic lifter is provided with a position sensor, and the position sensor is used for measuring the position of the main lift cylinder 21, so that the controller can be helped to adjust the position of each main lift cylinder.
In the present embodiment, a position sensor is described as an example of a pull sensor. The stay wire sensors measure the position of the main lifting oil cylinder 21 and feed back the position to the controller, and the controller adjusts the position of the corresponding main lifting oil cylinder according to the position information fed back by each stay wire sensor. Specifically, the oil supply of the main lift cylinder with the over-high speed is directly stopped under the control of the controller until the position of the main lift cylinder returns to the design range again; and when the positions of all the main lifting oil cylinders are within the design range, oil is supplied to the main lifting oil cylinders again.
By adjusting and/or arranging the pull wire sensor, errors between the plurality of hydraulic lifters can be eliminated during the lifting process. In practical engineering application, the error between the two can be controlled within +/-5 mm.
In conclusion, the load descending and moving method of the hydraulic lifter solves the problems that the hydraulic lifter cannot smoothly complete the conversion of an upper anchorage device and a lower anchorage device and smoothly descend with load in the load descending process in the prior art.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. A method for load-bearing descending of a hydraulic lifter, wherein the hydraulic lifter comprises an upper anchorage device, a main lifting oil cylinder, a lower anchorage device and a steel strand, the upper anchorage device moves along with the movement of the main lifting oil cylinder, one end of the steel strand is used for connecting a load, and the other end of the steel strand sequentially penetrates through the lower anchorage device, the main lifting oil cylinder and the upper anchorage device, and is characterized by comprising the following steps:
the main lifting oil cylinder is lowered from the top end to the bottom end of the stroke and then is lifted to a position close to the bottom, the lower anchorage is controlled to engage the steel strand at the position close to the bottom, and the upper anchorage releases the steel strand;
and lowering the main lift cylinder from the bottom-near position to the bottom end of the stroke.
2. Method of on-load lowering of a hydraulic lifter according to claim 1, characterized in that the method is performed simultaneously by a plurality of the hydraulic lifters on-load lowering, all the hydraulic lifters.
3. A method for on-load movement of a hydraulic lifter, wherein the hydraulic lifter comprises an upper anchorage device, a main lifting oil cylinder, a lower anchorage device and a steel strand, the upper anchorage device moves along with the movement of the main lifting oil cylinder, one end of the steel strand is used for connecting a load, and the other end of the steel strand sequentially penetrates through the lower anchorage device, the main lifting oil cylinder and the upper anchorage device, and is characterized by comprising the following steps:
s10, lifting the main lifting oil cylinder to a near-top position, controlling the upper anchorage device to engage the steel strand at the near-top position, and loosening the steel strand by the lower anchorage device so as to lift the steel strand to the top end of the stroke;
s11, lowering the main lifting oil cylinder from the top end to the bottom end of the stroke, then lifting to a near-bottom position, controlling the lower anchor to engage the steel strand at the near-bottom position, and loosening the steel strand by the upper anchor;
and S12, lowering the main lift cylinder from the bottom-approaching position to the bottom end of the stroke.
4. The method of loaded movement of a hydraulic lifter of claim 3, wherein after the step S12, the method further comprises: steps S10 to S12 are repeated.
5. The method of claim 3, wherein all the hydraulic lifters perform the steps S10-S12 synchronously with a plurality of the hydraulic lifters performing the loading movement.
6. The method of on-load movement of a hydraulic lifter of claim 5, further comprising: and after the hydraulic lifters work in an accumulated mode for a set stroke, leveling the plurality of hydraulic lifters.
7. The method of on-load movement of a hydraulic lifter of claim 6, wherein the method of leveling comprises:
measuring the attitude of the load;
and adjusting the position of each main lifting oil cylinder according to the posture of the load until the load is in a horizontal posture.
8. Method of on-load movement of a hydraulic lifter according to claim 7, characterized in that the movement of all the hydraulic lifters is controlled by the same controller.
9. The method of claim 8, wherein each of the hydraulic lifters includes a position sensor for measuring a position of the lift cylinders, the method of adjusting the position of each of the lift cylinders comprising:
feeding back the position of the main lifting oil cylinder to the controller through the position sensor;
and the controller adjusts the position of the corresponding main lifting oil cylinder according to the position information fed back by each position sensor.
10. The method of claim 9, wherein the position sensor is a pull wire sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010042909.9A CN111204660B (en) | 2020-01-15 | 2020-01-15 | Method for lowering and moving hydraulic lifter under load |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112832290A (en) * | 2021-01-04 | 2021-05-25 | 中交第四航务工程局有限公司 | Construction method for prefabricating and shipping immersed tube |
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| CN2677100Y (en) * | 2003-12-25 | 2005-02-09 | 上海同济宝冶建设机器人有限公司 | Heavy-duty hydraulic lifting robot |
| CN2866450Y (en) * | 2006-02-22 | 2007-02-07 | 宝山钢铁股份有限公司 | Feed-through hydraulic lifter |
| CN106006386A (en) * | 2015-12-16 | 2016-10-12 | 浙江精工钢结构集团有限公司 | Control method for hydraulic lifting equipment |
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