CN111675129B - Electric screw following jack and control method thereof - Google Patents
Electric screw following jack and control method thereof Download PDFInfo
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- CN111675129B CN111675129B CN202010472481.1A CN202010472481A CN111675129B CN 111675129 B CN111675129 B CN 111675129B CN 202010472481 A CN202010472481 A CN 202010472481A CN 111675129 B CN111675129 B CN 111675129B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
- B66F3/10—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated with telescopic sleeves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/44—Devices, e.g. jacks, adapted for uninterrupted lifting of loads with self-contained electric driving motors
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Abstract
The invention discloses an electric screw following jack, and relates to the technical field of building (structure) displacement transformation. The device comprises a chassis, wherein an outer cylinder and an inner cylinder are coaxially arranged on the chassis, the outer cylinder is fixedly connected with the chassis, and the inner cylinder is in threaded connection with the outer cylinder. And a driving unit for driving the inner cylinder to rotate is fixedly arranged in the inner cylinder on the chassis. The driving unit comprises a mounting bracket fixedly arranged on the chassis, a driving motor is fixedly arranged in the mounting bracket, and a driving arm for driving the inner cylinder to rotate is fixedly arranged on a power output shaft of the driving motor. And an anti-unbalance-loading spherical hinge is arranged at the upper end of the inner cylinder. The jack has the advantages of simple and compact structure, small volume and convenient installation and use. Meanwhile, the invention also provides a control method of the electric screw following jack, which can ensure that the tight-pushing end of the jack is always tightly propped against a jacked building.
Description
Technical Field
The invention relates to the technical field of building (structure) displacement transformation, in particular to a jacking following support of a building (structure) and a control method thereof.
Background
The shift modification of building is a special industry of building industry, wherein the jacking shift is a common form in the shift of building, a synchronous hydraulic jack is generally used for providing jacking power during jacking, and the synchronism control of the jacking jack in the jacking process plays a very important role in ensuring the safety of the jacked building. Because the stroke of jacking jack is limited in the jacking process, a stroke of jack generally can not reach the height requirement of jacking, consequently when the jack is ejecting to full stroke, need support temporarily the building (structure) that the top was jacked, so this temporary support is the important device in the jacking of building (structure), has important effect to the displacement synchronism of guaranteeing to be jacked the safety of building (structure) and jacking. At present, the temporary support in the building jacking project in China mainly adopts a method of adding a support column and a cushion plate or adding a following jack to the support column.
The method for adding the backing plate to the supporting column comprises the following steps: after the jacking jack finishes a jacking stroke, a supporting column is placed beside the jacking jack, steel plates with different thicknesses are used for padding when a gap exists between the supporting column and a underpinning structure of the jacked building (structure), then a piston of the jacking jack is retracted, the weight of the jacked building (structure) is borne by the temporary supporting column, after a cushion block with a corresponding size is added to the bottom or the top of the jacking jack, the piston of the jacking jack is jacked out again, the underpinning structure of the jacked building (structure) is separated from the temporary supporting column, and the whole weight of the jacked building (structure) is borne by the jacking jack again, so that the jacking jack is performed alternately, and the building (structure) is jacked to the designed height step by step.
The temporary supporting method of the supporting column and the base plate has the advantages of simple jacking system and low construction technical requirement; however, during installation support column and backing plate, hardly guarantee that a plurality of support columns are unanimous with the underpinning structure top tight degree by jacking building (structure), consequently withdraw as the jacking jack piston, when the weight of being transferred to temporary support column by jacking building (structure), certain deviation can appear in the back-falling height of building (structure), this kind of back-falling deviation can increase along with the increase of jacking height, and then influence the synchronism of jacking displacement, can produce great additional internal force in by jacking building (structure) when the deviation is great, thereby the influence is by the safety of jacking building (structure). At present, the synchronous jacking control precision of a domestic hydraulic synchronous jacking system reaches 0.1mm, but when the weight of a jacked building (structure) is transferred to a temporary support column, an error of several millimeters can be generated. In addition, in the jacking process of the jacking jack piston, the temporary supporting cushion block is generally added after the jacking jack completes one jacking stroke, so that once the jacking jack is jacked out and fails to unload suddenly in the jacking process, the temporary cushion block or the cushion plate is difficult to fill between the supporting column and the underpinning structure of the jacking building (structure) in time, and once the jacking jack which fails falls too much, the safety of the jacked building (structure) is endangered.
The method for adding the following jack to the supporting column comprises the following steps: the following jack is simultaneously arranged beside the jacking jack, the following jack beside the jacking jack is synchronously ejected out in the jacking process of the jacking jack, the following jack only provides little jacking force or does not provide jacking force basically, after the jacking jack completes one jacking stroke, the piston of the jacking jack is retracted, the weight of the building (structure) to be jacked is borne by the following jack, the cushion block with corresponding size is added at the bottom or the top of the jacking jack, the piston of the jacking jack is ejected out again, the underpinning structure of the building (structure) to be jacked is separated from the following jack, the weight of the building (structure) to be jacked is borne by the jacking jack again, the piston of the following jack is retracted, the cushion block with corresponding size is added at the bottom or the top of the following jack, the jacking jack and the following jack are synchronously started again, the steps are alternately carried out, and the building (structure) is gradually jacked to the designed height.
The method of support column with follow jack has the security height, the good advantage of synchronous control nature, when the jacking jack will be by jacking building (structure) building jack-up, the piston of following the jack can follow up at any time, when the jacking jack reaches the maximum stroke, follow the jack and can be simultaneously will be by jacking building (structure) building jack-up tight, withdraw as the piston of jacking jack, by the weight of jacking building (structure) shift gradually to follow the jack when being very little and basically unanimous by the fall-back of jacking building (structure) building.
At present, following jacks mainly comprise the following jacks: the jack is driven by a common screw jack, a hydraulic drive following jack and a motor. When the jack is followed by a common screw, each screw jack needs to be ejected by one person, and more manpower and material resources need to be consumed. When the hydraulic drive is adopted to follow the jack, the hydraulic drive is adopted, and the problem of the jack also exists, namely when the follow jack breaks down and is unloaded, the follow jack also can fall down instantly.
The jack is followed to motor drive spiral, owing to adopt spiral jacking's mode, consequently as long as can guarantee to follow the jack the tight end top of top tightly by the underpinning structure of jacking building (structure), even follow the jack and break down, because the problem of jacking building (structure) structure whereabouts can not appear yet in the existence of screw thread self-locking action. However, how to make the tight end of the jack always tightly prop against the underpinning structure of the building (structure) to be jacked is a key problem to be solved at present.
In order to solve the problem, patent application publication No. CN101806152A discloses an automatic following support system and method, in which a displacement micrometer is used to monitor the gap distance between a following support device and a lifted weight, and a controller is used to control the following support device to extend and retract according to the gap distance measured by the micrometer. Although the micrometer in the method can measure a tiny distance, the distance exists, and the jacking end of the following jack cannot be guaranteed to be jacked on a underpinning structure of a jacked building (structure).
In addition, although the patent with application publication number CN101806152A provides a solution for driving the screw following jack by the motor, the solution has a complex structure and a large volume, so that the following jack has a large plane size and is not easy to install during use.
Disclosure of Invention
Aiming at the problems, the invention provides an electric screw following jack which is simple and compact in structure, small in size and convenient to install and use. Meanwhile, the invention also provides a control method of the electric screw following jack, which can ensure that the jacking end of the following jack always jacks against the underpinning structure of the building (structure) to be jacked.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the electric screw following jack comprises a chassis, wherein an outer cylinder and an inner cylinder are coaxially arranged on the chassis, the outer cylinder is fixedly connected with the chassis, and the inner cylinder is in threaded connection with the outer cylinder;
a driving unit for driving the inner cylinder to rotate is fixedly arranged in the inner cylinder on the chassis;
the driving unit comprises a mounting bracket fixedly arranged on the chassis, a driving motor is fixedly arranged in the mounting bracket, a driving arm for driving the inner cylinder to rotate is fixedly arranged on a power output shaft of the driving motor, and the driving arm can axially slide relative to the inner cylinder.
And an anti-unbalance-loading spherical hinge is fixedly arranged at the upper end of the inner cylinder.
Furthermore, the driving arm comprises a connecting part, at least two fin plates are uniformly distributed on the connecting part along the circumferential direction, and sliding grooves corresponding to the fin plates are formed in the cylindrical surface of the inner side of the inner cylinder.
Further, a first concave part is arranged on the chassis, the lower end of the outer cylinder is inserted into the first concave part, and the diameter of the first concave part is equal to the outer diameter of the outer cylinder.
Furthermore, the outer barrel comprises an outer barrel body, a detachable outer barrel nut is fixedly arranged in the outer barrel body, and the outer barrel nut and the inner barrel are matched to realize the extension and retraction of the inner barrel.
Further, the hole of outer barrel is the step poroid, down includes first hole section and the second hole section that the diameter reduces in proper order from last, just first hole section and second hole section between form first step face, the outside cylinder of urceolus nut is the step axle form, down includes first axle section and the second axle section that the diameter reduces in proper order from last, just first axle section and second axle section between form the second step face, the second axle section insert first hole section in, just adopt interference fit between second axle section and the first hole section.
Further, when the lower end face of the outer barrel nut abuts against the first step face, the distance between the upper end face of the outer barrel and the second step face is 1-2 mm.
Furthermore, the side wall of the mounting bracket is provided with an avoiding hole.
Further, anti unbalance loading ball pivot from last down include in proper order top tight board and with inner tube fixed connection's fixed bedplate, the downside of top tight board is spherical, be provided with on the last side of fixed bedplate with the downside matched with sphere recess of top tight board, top tight board and fixed bedplate between be provided with sixth locking screw, be provided with a bottom surface on the last side of top tight board for the second depressed part of spherical, just the bottom surface of second depressed part with the downside of top tight board is concentric, be provided with on the bottom surface of second depressed part and be used for holding sixth locking screw's through-hole, be provided with in the sphere recess of fixed bedplate with sixth locking screw matched with fourth screw hole.
The control method of the electric screw following jack comprises the following steps,
firstly, setting a trial starting current and a maximum working current, wherein the trial starting current is greater than the no-load running current of a driving motor;
secondly, the PLC tries to start the driving motor with the starting current;
2.1 when the anti-unbalance-loading spherical hinge is in a separation state or a light contact state with the underpinning structure of the jacked building, starting a driving motor, and driving an electric screw to extend out or further jack along with the inner cylinder of the jack until the anti-unbalance-loading spherical hinge is tightly jacked on the underpinning structure of the jacked building, and the driving current is equal to the set maximum protection current, at the moment, sending a signal for stopping working to the driving motor by a PLC (programmable logic controller), and stopping working of the driving motor;
2.2 when the anti-unbalance-loading spherical hinge and the underpinning structure of the jacked building are in a jacking state, the trial starting current is not enough to start the driving motor to work, and the driving motor is still in a shutdown state;
thirdly, after a time interval T, the second step is repeated.
Further, the time interval T in the third step is 1-10 seconds.
The invention has the beneficial effects that:
1. as for the structure of the following jack, the mode of internally arranging the motor is adopted, the structure is simple and compact, the whole size is small, and the installation and the disassembly are convenient.
2. As for the control method, the control method can ensure that the jacking end of the following jack always jacks the underpinning structure of the jacked building (structure).
3. Because the following jack in this scheme adopts the mode of spiral jacking, when the piston rod of jacking cylinder retracted, lean on the screw thread self-locking action between inner tube and the urceolus to be used for supporting by the structure of jacking, consequently the drive power of motor only is used for following in the following jack, need not adopt powerful motor, but adopts direct current motor drive. Compared with a hydraulic drive following jack, the energy consumption is greatly reduced, and the hydraulic drive following jack has better safety and reliability.
4. The automatic starting and stopping of following jack full stroke is realized through direct current motor drive current comparator circuit and PLC, and at the in-process that hydraulic jacking jack will be jacked by the jacking weight, can ensure to follow jack and tightly be jacked by the jacking weight at any time, in case hydraulic jacking jack unusual off-load appears, under the prerequisite of guaranteeing to be jacked weight safety, can furthest protect driving motor, simultaneously can also effectively practice thrift the power consumption.
Drawings
FIG. 1 is a first schematic perspective view of an electric screw follower jack;
FIG. 2 is a schematic perspective view of an electric screw follower jack;
FIG. 3 is a schematic view showing the internal structure of the electric screw follower jack I (retracted state);
FIG. 4 is a schematic diagram of the internal structure of the electric screw following jack (following state);
FIG. 5 is an exploded view of the electric screw follower jack;
FIG. 6 is a first perspective view of the chassis;
FIG. 7 is a second perspective view of the base plate;
FIG. 8 is an exploded view of the drive unit;
FIG. 9 is a first perspective view of the outer barrel;
FIG. 10 is a schematic perspective view of the outer barrel;
FIG. 11 is an exploded view of the outer barrel;
FIG. 12 is a perspective view of the inner barrel;
FIG. 13 is an exploded view of an anti-offset ball hinge;
FIG. 14 is an exploded view of the anti-offset ball hinge;
FIG. 15 is a cross-sectional view of the tightening plate;
FIG. 16 is a control flow chart;
fig. 17 is a circuit diagram of the control system.
In the figure: 1-chassis, 11-first sunken part, 12-first counter bore, 13-second threaded hole, 14-mounting hole,
2-drive unit, 21-drive motor, 22-mounting bracket, 221-avoidance hole, 222-connecting flange, 23-third locking screw, 24-drive arm, 25-fourth locking screw,
3-outer cylinder, 31-outer cylinder, 311-first step surface, 312-first threaded hole, 313-threading hole, 32-outer cylinder nut, 321-internal thread,
4-inner cylinder, 41-external screw thread, 42-driving slide groove, 43-third screw hole,
5-an anti-eccentric load spherical hinge, 51-a fixed seat plate, 511-a second counter bore, 512-a spherical groove, 513-a fourth threaded hole, 514-an insertion part, 515-a bulge, 52-a tightening plate, 521-a second sunken part, 53-a fifth locking screw, 54-a sixth locking screw,
6-the first locking screw is in the shape of a screw,
7-second locking screw.
Detailed Description
Example one
As shown in fig. 1, 2, 3 and 5, the electric screw following jack includes a chassis 1, an outer cylinder 3 is fixedly disposed on the chassis 1, the outer cylinder 3 is a cylindrical cylinder with two open ends, the lower end of the outer cylinder 3 is fixedly connected to the chassis 1 through a first locking screw 6, and an internal thread 321 is disposed at the upper end of the inner cylindrical surface of the outer cylinder 3. An inner cylinder 4 which is coaxial with the outer cylinder 3 is arranged in the outer cylinder 3, and an external thread 41 which is meshed with the internal thread 321 is arranged on the outer cylindrical surface of the inner cylinder 4. A driving unit 2 for driving the inner cylinder 4 to rotate is arranged inside the inner cylinder 4 on the chassis 1, and as shown in fig. 3 and 4, the inner cylinder 4 extends and retracts through the mutual matching of the internal thread 321 and the external thread 41 in the rotating process. And an anti-unbalance-loading spherical hinge 5 is fixedly arranged at the upper end of the inner cylinder 4.
As a specific embodiment, as shown in fig. 7 and 10, a first counter bore 12 for accommodating the first locking screw 6 is provided on the lower side surface of the chassis 1, and a first threaded hole 312 matched with the first locking screw 6 is provided on the lower end surface of the outer cylinder 3.
As shown in fig. 8, the driving unit 2 includes a mounting bracket 22, and the mounting bracket 22 is a cylindrical cylinder with an upper end closed and a lower end opened, and the lower end of the mounting bracket 22 is fixedly connected to the chassis 1 through a second locking screw 7. As a specific embodiment, as shown in fig. 5, 6 and 7, a connecting flange 222 is fixedly disposed at the lower end of the mounting bracket 22 by welding, a through hole for receiving the second locking screw 7 is disposed on the connecting flange 222, and a second threaded hole 13 matched with the second locking screw 7 is disposed on the chassis 1.
As shown in fig. 3 and 8, a driving motor 21 is disposed in the mounting bracket 22, the driving motor 21 is fixedly connected to the closed end of the mounting bracket 22 through a third locking screw 23, the closed end of the mounting bracket 22 is respectively provided with a through hole for accommodating the third locking screw 23 and a power output shaft of the driving motor 21, and the power output shaft of the driving motor 21 passes through the closed end of the mounting bracket 22 and extends to the outside of the mounting bracket 22. As a specific implementation manner, the driving motor 21 described in the present embodiment is driven by direct current, and the power supply voltage is not more than 36V.
As shown in fig. 3 and 8, a driving arm 24 is fixedly disposed on the power output shaft of the driving motor 21, the driving arm 24 can drive the inner cylinder 4 to rotate together with the driving arm 24, and the driving arm 24 can axially slide relative to the inner cylinder 4. As an embodiment, as shown in fig. 8, the driving arm 24 in this embodiment includes a cylindrical connecting portion, and two fins extending radially outward are disposed on an outer cylindrical surface of the connecting portion, and preferably, an included angle between the two fins is 180 °. As shown in fig. 12, the inner cylindrical surface of the inner cylinder 4 is provided with a sliding groove 42 corresponding to the fin plate, and the suspended end of the fin plate is inserted into the sliding groove 42. Preferably, the sliding groove 42 axially penetrates the inner cylinder 4.
As a specific embodiment, as shown in fig. 8, in this embodiment, a connection manner of a key connection is adopted between the connection portion of the driving arm 24 and the power output shaft of the driving motor 21, and a fourth locking screw 25 for limiting the axial degree of freedom of the driving arm 24 is disposed on an end surface of the power output shaft of the driving motor 21.
Further, for convenience of installation, as shown in fig. 6, a first recess 11 having a circular shape is provided on an upper side surface of the chassis 1, a lower end of the outer cylinder 3 is inserted into the first recess 11, and a diameter of the first recess 11 is equal to an outer diameter of the outer cylinder 3. The chassis 1 is provided with mounting holes 14 uniformly distributed along the circumferential direction at the outer side of the first concave part 11.
Further, the outer cylinder 3 comprises an outer cylinder 31, a detachable outer cylinder nut 32 is fixedly arranged in the outer cylinder 31, and the outer cylinder nut 32 is matched with the inner cylinder 4 to realize the extension and retraction of the inner cylinder 4.
As a specific embodiment, as shown in fig. 9, 10 and 11, in this embodiment, the inner hole of the outer cylinder 31 is in a step hole shape, and for convenience of description, the inner hole of the outer cylinder 31 is named as a first hole section and a second hole section from top to bottom according to the diameter of the inner hole, the diameter of the first hole section is greater than that of the second hole section, and a first step surface 311 is formed between the first hole section and the second hole section.
The outer cylindrical surface of the outer barrel nut 32 is in a stepped shaft shape, for convenience of description, the outer barrel nut 32 is named as a first shaft section and a second shaft section from top to bottom in sequence according to the size of the outer diameter of the outer barrel nut 32, the diameter of the first shaft section is larger than that of the second shaft section, and a second stepped surface is formed between the first shaft section and the second shaft section. The inner cylindrical surface of the outer barrel nut 32 is provided with an internal thread 321 which is matched with the external thread 41 on the inner barrel 4.
The second shaft section is inserted into the first hole section, and interference fit is adopted between the second shaft section and the first hole section.
The reason for this is that the electric screw following jack is designed to bear the weight by the self-locking force of the screw thread between the inner cylinder 4 and the outer cylinder 3 when in operation, and therefore, the screw thread parts of the inner cylinder 4 and the outer cylinder 3 are easily damaged by fatigue during use. If the outer cylinder 3 is designed in an integrated manner, the outer cylinder 3 can only be replaced when the internal thread 321 of the outer cylinder 3 is damaged due to fatigue, which results in high cost. By arranging the outer barrel nut 32 in the outer barrel 3, when the thread on the outer barrel 3 is damaged, only the outer barrel nut 32 needs to be replaced, and the maintenance cost is reduced.
Further, when the lower end surface of the outer cylinder nut 32 abuts against the first step surface 311, the distance between the upper end surface of the outer cylinder 31 and the second step surface is 1-2 mm.
As shown in fig. 9, 10 and 11, a threading hole 313 is provided at a lower end of the outer cylinder 31, and a power line of the driving motor 21 is led out from the threading hole 313.
Further, in order to facilitate the installation of the driving motor 21, as shown in fig. 8, an avoiding hole 221 is formed in a side wall of the mounting bracket 22, so that when installing, an operator may insert a hand into the mounting bracket 22 from the avoiding hole 221 to hold the driving motor 21, and then fix the driving motor 21.
As a specific implementation manner, as shown in fig. 8, in this embodiment, two square avoiding holes 221 are formed in the side wall of the mounting bracket 22 along the vertical direction, and the avoiding holes 221 penetrate through the mounting bracket 22 along the radial direction.
As shown in fig. 13 and 14, the anti-eccentric spherical hinge 5 sequentially includes a tightening plate 52 and a fixed seat plate 51 from top to bottom, a lower side surface of the tightening plate 52 is a spherical surface, and an upper side surface of the fixed seat plate 51 is provided with a spherical groove 512 matched with the lower side surface of the tightening plate 52. The fixed seat plate 51 is fixedly connected with the inner cylinder 4 through a fifth locking screw 53. As a specific embodiment, as shown in fig. 12 and 13, a plurality of second counter bores 511 for accommodating the fifth locking screws 53 are uniformly arranged on the fixing seat plate 51 outside the spherical groove 512 along the circumferential direction, and the upper end surface of the inner cylinder 4 is provided with third threaded holes 43 matched with the fifth locking screws 53. As shown in fig. 4, 13 and 14, a sixth locking screw 54 is disposed between the tightening plate 52 and the fixed seat plate 51, and under the locking action of the sixth locking screw 54, the lower side surface of the tightening plate 52 is attached to the spherical recess 512 of the fixed seat plate 51 and can rotate spherically in the spherical recess 512. As a specific embodiment, as shown in fig. 13 and 15, a second concave portion 521 having a spherical bottom surface is provided at the geometric center of the upper side surface of the tightening plate 52, and the bottom surface of the second concave portion 521 is concentric with the lower side surface of the tightening plate 52. A through hole for accommodating the sixth locking screw 54 is formed in the geometric center of the bottom surface of the second recessed portion 521, and the axis of the through hole for accommodating the sixth locking screw 54 passes through the spherical center of the bottom surface of the second recessed portion 521. A fourth threaded hole 513 matched with the sixth locking screw 54 is arranged at the geometric center of the spherical groove 512 on the fixed seat plate 51, and the axis of the fourth threaded hole 513 passes through the spherical center of the spherical groove 512.
Further, as shown in fig. 14, the lower side surface of the fixed seat plate 51 is provided with a plug-in part 514 which is engaged with the inner cylinder 4. The cylindrical surface of the outer side of the insertion part 514 is provided with a projection 515 matched with the sliding groove 42, when the device is installed, the projection 515 is aligned with the sliding groove 42 of the inner cylinder 4, and then the insertion part 514 is inserted into the inner cylinder 4.
As shown in fig. 17, the components of the driving part of the electric screw follower jack will now be briefly described in order to facilitate understanding of the control method.
The driving part of the electric screw following jack consists of a direct current motor, a direct current driver, a motor driving current detection comparator and a PLC controller.
The dc motor driver is a standard dc motor driving module, which belongs to the prior art and is not described herein again.
The motor driving current detection comparator is characterized in that a current detection sensor is connected into a motor driving circuit, the current of the motor in working is collected in real time, the current is converted into a voltage comparison signal through an A/D converter, the voltage comparison signal is compared with a preset protection current and a preset starting current, and a control signal is output to a PLC.
The PLC controller is a control center for controlling the extending/following, stopping and retracting actions of the electric screw following jack, the PLC sends out starting work and stopping signals and controls the following speed of the electric screw following jack according to a preset speed value, and meanwhile, the direct current motor driving current detection comparator feeds back the protection current and the starting current signals of the direct current motor to the PLC and superposes the protection current and the starting current signals to the starting and stopping signals of the PLC.
The parameters are predefined as follows:
I0the current for following the no-load operation of the jack is determined by actual measurement.
Imin setThe test starting current is slightly larger than the no-load running current I of the following jack0Preferably, said Imin setIs 1.1-1.2I0。
Imax setThe maximum protection current is set, and the set maximum protection current is equal to the maximum protection current of the selected direct current motor.
I is the driving current when the jack is operated, and the value of I is between Imin setAnd Imax setIn the meantime.
As shown in fig. 16, the method for controlling the electric screw follower jack includes the following steps:
first, a trial start current I is setmin setAnd maximum operating current Imax setAnd said test start current Imin setGreater than the idling current I of the drive motor 210。
As a specific embodiment, the no-load operation current I of the driving motor 21 in the present embodiment0Set a test start current I of 6Amin setThe current is 7.2A, the action time of the test starting current is 1-2 seconds, and the set maximum working current is 15A.
Second, the PLC controller starts the current I with a testmin setAn attempt is made to start the drive motor.
There are two situations in this process that can occur,
2.1 when the anti-eccentric load spherical hinge 5 is in a separation state or a light contact state with the underpinning structure of the jacked building, the current I is started due to trialmin setGreater than the idling current I of the drive motor 210Therefore, the driving motor 21 is started and drives the electric screw to extend out or further push tightly along with the inner cylinder 4 of the jack. Until the anti-unbalance loading spherical hinge 5 is tightly pressed on the underpinning structure of the jacked building, and the driving current I is equal to the set maximum protection current Imax setAt this time, the PLC sends a signal for stopping working to the driving motor, and the driving motor stops working.
After the anti-unbalance-loading spherical hinge 5 is tightly jacked on the underpinning structure of the jacked building, along with the propulsion of the jacking process, the load of the driving motor 21 is increased, and the corresponding driving current is also increased.
2.2 when the eccentric load resisting spherical hinge 5 and the underpinning structure of the jacked building are in a jacking state, the starting current required by the driving motor is larger than the starting test current Imin setAt this time, the trial starting current Imin setThe driving motor is still in a shutdown state when the driving motor is not enough started to work.
Thirdly, after a time interval T, the second step is repeated.
That is, during the period that the driving motor stops running along with the larger load of the jack, the PLC controller can set the starting current I at a certain time interval (which can be 5-10 seconds according to the jacking speed of the jacked weight and can be set in the PLC)min setAutomatic trial start DCThe motor, if the load following the jack is still larger, the actually required driving current is larger than Imin setIf so, the driving motor is continuously in a stop state; when the hydraulic jack is gradually jacked up by the jacking weight and the load of the following jack is gradually reduced, the direct current motor can start current Imin setWhen the drive runs, the motor rotates and drives the inner cylinder of the following roof to extend out again, and when the load of the following roof is increased to the motor drive current to reach the protection current Imax setWhen the jack is in a reciprocating state, the PLC automatically controls the direct current motor to stop running, so that the jack can be ensured to be always in a contact state with a lifted weight.
In the actual working process, the extension speed of the hydraulically-driven jacking jack is lower than that of the electric screw following jack. The control method can ensure that the anti-unbalance-loading spherical hinge 5 of the electric screw following jack is always attached to the underpinning structure of the jacked building; on the other hand, when the motor driving current detection comparator fails, the direct current driver can feed back fault signals such as overheating or exceeding of the maximum working current of the direct current motor to the PLC controller after detecting that the fault signals occur, and the PLC controller can immediately stop the operation of the direct current motor, so that a dual protection effect can be achieved.
Preferably, the time T of the interval in the third step may be set to 1 to 10 seconds according to the jacking speed.
Example two
The outer cylindrical surface of the connecting part is provided with three fin plates extending outwards in the radial direction, and the three fin plates are uniformly distributed in the circumferential direction, namely the included angle between every two adjacent fin plates is 120 degrees. The rest of the structure is the same as the first embodiment.
Claims (9)
1. The control method of the electric screw following jack is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
firstly, setting a trial starting current and a maximum working current, wherein the trial starting current is greater than the no-load running current of a driving motor;
secondly, the PLC tries to start the driving motor with the starting current;
2.1 when the anti-unbalance-loading spherical hinge is in a separation state or a light contact state with the underpinning structure of the jacked building, starting a driving motor, and driving an electric screw to extend out or further jack along with the inner cylinder of the jack until the anti-unbalance-loading spherical hinge is tightly jacked on the underpinning structure of the jacked building, and the driving current is equal to the set maximum protection current, at the moment, sending a signal for stopping working to the driving motor by a PLC (programmable logic controller), and stopping working of the driving motor;
2.2 when the anti-unbalance-loading spherical hinge and the underpinning structure of the jacked building are in a jacking state, the trial starting current is not enough to start the driving motor to work, and the driving motor is still in a shutdown state;
thirdly, after a time interval T, the second step is repeated.
2. The electric screw follower jack control method as claimed in claim 1, wherein: the time interval T in the third step is 1-10 seconds.
3. An electric screw following jack to which the control method of claim 1 is applied, characterized in that: the device comprises a chassis, wherein an outer cylinder and an inner cylinder are coaxially arranged on the chassis, the outer cylinder is fixedly connected with the chassis, and the inner cylinder is in threaded connection with the outer cylinder;
a driving unit for driving the inner cylinder to rotate is fixedly arranged in the inner cylinder on the chassis;
the driving unit comprises a mounting bracket fixedly arranged on the chassis, a driving motor is fixedly arranged in the mounting bracket, a driving arm for driving the inner cylinder to rotate is fixedly arranged on a power output shaft of the driving motor, and the driving arm can axially slide relative to the inner cylinder;
the upper end of the inner cylinder is provided with an anti-unbalance-loading spherical hinge;
the driving arm comprises a connecting part, at least two fin plates are uniformly distributed on the connecting part along the circumferential direction, and sliding grooves corresponding to the fin plates are formed in the inner side cylindrical surface of the inner cylinder.
4. The electric screw-following jack according to claim 3, wherein: the chassis is provided with a first sunken part, the lower end of the outer barrel is inserted into the first sunken part, and the diameter of the first sunken part is equal to the outer diameter of the outer barrel.
5. The electric screw-following jack according to claim 3, wherein: the outer barrel comprises an outer barrel body, a detachable outer barrel nut is fixedly arranged in the outer barrel body, and the outer barrel nut and the inner barrel are matched to realize the stretching of the inner barrel.
6. The electric screw-following jack according to claim 5, wherein: the hole of outer barrel is the step poroid, down includes first hole section and the second hole section that the diameter reduces in proper order from last, just first hole section and second hole section between form first step face, the outside cylinder of urceolus nut is the step axle form, down includes first shaft segment and the second shaft segment that the diameter reduces in proper order from last, just first shaft segment and second shaft segment between formed the second step face, the second shaft segment insert first hole section in, just adopt interference fit between second shaft segment and the first hole section.
7. The electric screw-following jack according to claim 6, wherein: when the lower end face of the outer barrel nut abuts against the first step face, the distance between the upper end face of the outer barrel and the second step face is 1-2 mm.
8. The electric screw-following jack according to claim 3, wherein: and the side wall of the mounting bracket is provided with a dodging hole.
9. The electric screw-following jack according to claim 3, wherein: the anti unbalance loading ball pivot from last down include in proper order top tight board and with inner tube fixed connection's fixed bedplate, the downside of top tight board is spherical, be provided with on the last side of fixed bedplate with the downside matched with sphere recess of top tight board, top tight board and fixed bedplate between be provided with sixth locking screw, be provided with a bottom surface on the last side of top tight board for the second depressed part of spherical, just the bottom surface of second depressed part with the downside of top tight board is concentric, be provided with on the bottom surface of second depressed part and be used for holding sixth locking screw's through-hole, be provided with in the sphere recess of fixed bedplate with sixth locking screw matched with fourth screw hole.
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| CN202010472481.1A CN111675129B (en) | 2020-05-29 | 2020-05-29 | Electric screw following jack and control method thereof |
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| CN202010472481.1A CN111675129B (en) | 2020-05-29 | 2020-05-29 | Electric screw following jack and control method thereof |
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| CN113668774B (en) * | 2021-08-12 | 2023-10-20 | 中冶南方城市建设工程技术有限公司 | Twisted steel tensioning and anchoring device and construction method thereof |
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