CN102518116A - Electromagnetic tamper - Google Patents
Electromagnetic tamper Download PDFInfo
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- CN102518116A CN102518116A CN2011104057768A CN201110405776A CN102518116A CN 102518116 A CN102518116 A CN 102518116A CN 2011104057768 A CN2011104057768 A CN 2011104057768A CN 201110405776 A CN201110405776 A CN 201110405776A CN 102518116 A CN102518116 A CN 102518116A
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Abstract
The invention relates to an electromagnetic tamper, which comprises a housing, a plate pressing body, an electromagnet, a travel switch and a trolley, wherein the plate pressing body consists of four pressure bars connected with a middle flat panel and a pressure head, metal guide rails are arranged on the four pressure bars and can be used as wires for supplying power for a middle electromagnet; a top electromagnet is welded below a top cover and the middle electromagnet is arranged between the middle flat panel and a pallet; a bottom electromagnet is welded at the bottom of a housing tube; the travel switch is arranged on the internal wall of the housing tube and a hole is formed in the wall of the housing tube so that wires can be led out and connected to a power supply controller; and the housing tube is fixedly connected with a trolley through a connecting flange on a metal connecting sleeve. Direct current is applied to the top electromagnet and the bottom electromagnet and alternating square wave current is applied to the middle electromagnet. According to the invention, three electromagnets combined with the travel switch are used for the downward tamping action and the upward retracting action of the tamper based on the electromagnet principle that same electric charges mutually repulse and opposite electric charges attract. The electromagnetic tamper disclosed by the invention has the characteristics of a simple structure, easy control, good expansibility and capabilities of implementing the vibration tamping and impaction tamping function and adjusting the impaction frequency and the vibration amplitude.
Description
Technical field
The present invention relates to a kind of electromagnetic rammer-compactor, specifically a kind ofly utilize the principle that the electromagnet same sex is repelled each other, there is a natural attraction between the sexes, adopt three blocks of electromagnet to accomplish rammer compacters and dash down and process last time, realize the electromagnetic rammer-compactor of vibrations compacting, battering ram actual effect fruit.
Background technology
In recent years, China's Foundation Design is built high speed development.But a ubiquitous problem is at present: owing to the ground discontinuity produces the ground collapse problem.One of a kind of effective way that addresses this problem strengthens the compactness and the bearing strength on ground through the compacting of special mechanical equipment exactly, reduces the settlement amount after construction that bankets.At present, traditional tamping apparatus is also various, but basically all is big heavy-duty machinery, heavy and often need with the supporting use of main equipment, cost is higher.And the method for compacting foundation generally has three kinds: compacting, jolt ramming and roll reality.Mostly be the mechanical eccentric formula in the tradition compacting method, its power consumption is big, and is bulky; Move un-skill, function singleness, the compacting frequency not high enough; Efficient is low, and like the small-sized dull and stereotyped rammer compacter employing mechanical eccentric formula of frequent use, eccentric force is bigger when rotating because of its eccentric tube; So equipment failure rate is high, need often to change eccentric tube, and compaction effort is little.Domestic a kind of vertical column type electromagnetic rammer-compactor also disclosed; Also has flat-board type electromagnetic vibration compaction machine on the market; Adopt the electro-magnetic exciting force of electromagnetic actuator to drive, through regulating spring rigidity or regulate the amplitude that supply frequency changes rammer compacter, to reach the optimum efficiency of compacting.Its weak point is that this rammer compacter has adopted in the middle of electromagnet and plane bottom plate and is provided with spring, so when electromagnet adds the electric attraction plane bottom plate, receive the reaction force of spring, increased energy consumption; Attraction reduces along with distance increases when powering up owing to electromagnet simultaneously, so limited between itself and base plane base plate apart from less, the electromagnet inertia that the back plane base plate obtains under less distance by spring tension that cuts off the power supply is also less, so its percussion is less; In the middle of electromagnet and plane bottom plate, spring is set, the floor, plane is actually the elastic force of spring to the compacting power of soft terrain, just must change spring so want to change maximum compacting power.
Summary of the invention
The objective of the invention is the inconvenience and the drawback that exist in the prior art for solving, both can realize that the vibrations compacting can realize impacting compacting and provide a kind of, have simple in structure, easy to control, the electromagnetic rammer-compactor that frequency of impact and vibration amplitude are adjustable.
For realizing above-mentioned purpose; The technical scheme that the present invention adopts is: a kind of electromagnetic rammer-compactor is provided; Comprise casing, pressing plate body, electromagnet, travel switch and dolly; Described casing is made up of top cover and outer thimble, and the bottom of outer thimble is provided with the end of a circular groove, and outer thimble inwall is fixed with pilot hole; Described pressing plate body is made up of middle square position, pressure head and four depression bars, square position and pressure head in the middle of four depression bars connect, and pressure head is at the pressing plate body bottom; Described electromagnet is made up of top electromagnet, middle electromagnet and bottom electromagnet, and described top electromagnet is fixed under the top cover, and middle electromagnet is installed between the middle square position and pallet of pressing plate body, and is fixed under the middle square position; Bottom electromagnet is welded on outer thimble bottom through sleeve flange to be had at the end of circular groove; Outer thimble inwall is provided with travel switch; Be provided with metal guide rail on the bar of four depression bars corresponding moving range in pilot hole, metal guide rail also plays lead and act as middle electromagnet power supply; Have aperture on the shell barrel and be used for drawing electrified wire; Outer thimble outside is provided with the metal adapter sleeve; The flange of the adpting flange through metal adapter sleeve end and the dolly joint pin end of dolly front end is fixed together, and the power-supply controller of electric of control rammer compacter operation is installed on the described dolly.
Electromagnetic rammer-compactor of the present invention is described connect in the middle of four depression bars of square position and pressure head intert in the pilot hole of outside being arranged on thimble inwall.Four depression bars in the described pilot hole are provided with metal guide rail on the bar of corresponding moving range, metal guide rail is made up of internal insulating layer and external conductive medium.
The described travel switch of electromagnetic rammer-compactor of the present invention is installed in the place, nearly two ends in the moving range of the middle square position of outer thimble inwall correspondence, the electrical current direction of electromagnet in the middle of the moving range of electromagnet and the change in the middle of limiting through travel switch.
The electric current that is communicated with in electromagnetic rammer-compactor of the present invention described top electromagnet and the bottom electromagnet is a direct current, and electromagnet top, top is the S utmost point, and the bottom is the N utmost point; The top of bottom electromagnet is the N utmost point, and the bottom is the S utmost point; What be communicated with in the middle electromagnet is the square wave current with the direction alternation of varying in size.
The size of current that is communicated with in the electromagnet in the middle of electromagnetic rammer-compactor of the present invention is described square wave different and the direction alternation is that positive current is big, the time short, the square wave current that negative current is little, the time is long.
The course of work of electromagnetic rammer-compactor of the present invention is to utilize the principle that the electromagnet same sex is repelled each other, there is a natural attraction between the sexes; Adopting three blocks of electromagnet to combine travel switch to accomplish rammer compacter dashes and process last time down: in middle electromagnet moves up and down process; The size and Orientation of electrical current is constant in top and the bottom electromagnet; Promptly feed constant dc, electromagnet top, top is the S utmost point, and the bottom is the N utmost point; The top of bottom electromagnet is the N utmost point, and the bottom is the S utmost point.The positive and negative alternation square wave current of middle electromagnet input through amplifying; Middle electromagnet touches the galvanization generation of upper run switch time institute on casing top magnetic is that top is the N utmost point; The bottom is the S utmost point; Repel each other according to the electromagnet same sex, the principle that there is a natural attraction between the sexes is used the double action of scolding and descending to inhale middle electromagnet is moved downward with peak acceleration and impact force.In like manner; Middle electromagnet touches the galvanization generation of lower run switch time institute in the casing bottom magnetic is that top is the S utmost point, and the bottom is the N utmost point, repels each other according to the electromagnet same sex; The principle that there is a natural attraction between the sexes is used the double action of inhaling and scolding down and is made middle electromagnet get back to upper.The positive and negative variation of square wave current that middle electromagnet feeds is to be provided by power-supply controller of electric according to the signal that the different travel switches in upper and lower part spread out of.Current amplitude was big when electromagnet descended in the middle of in the course of work, the time short, and pressure head when rising little, time length of current amplitude be in order to reach the plunge effect of slow liter of pressure head.Plunge and slow rise that the electromagnetic type rammer compacter is obtained is big down towards impact force and last time stably.Can change himself frequency of impact or vibration frequency through the electrical current amplitude of electromagnet in the middle of regulating, the vibrations of middle electromagnet or impact amplitude can realize through changing its energising square wave.
Electromagnetic type rammer compacter vibration compacting of the present invention can realize through the distance of dwindling between the travel switch, can also realize through the positive and negative alternating frequency of electromagnet power supply in the middle of changing.
Electromagnetic type rammer compacter of the present invention compared with prior art has the following advantages:
1, the present invention is ingenious utilizes the principle that the electromagnet same sex is repelled each other, there is a natural attraction between the sexes; The signal that following three blocks of electromagnet combine travel switch to provide in the employing; Accomplish rammer compacter and dash down and process last time, down towards the stage use the double action of scolding and inhaling down make in the middle of electromagnet reach peak acceleration and impact force, stage last time is used the double action of inhaling and scolding down under the adjustment suitable current makes middle electromagnet get back to upper; Middle electromagnet motion and then drive pressing plate move up and down in overall, and realize compacting.
2, rammer compacter of the present invention does not use the structure of spring, reduces energy consumption, and efficient is high, adopts electromagnetic force to drive, and uses the present invention can not pollute environment.
3, rammer compacter of the present invention is simple in structure; Easy to control; Not only can realize the vibrations compacting but also can realize impacting compacting that have the adjustable characteristics of frequency of impact and vibration amplitude, this rammer compacter structure is through transforming other field or the equipment of also can be applicable to; Such as catalase or impact drilling etc., has very strong expansion.
Description of drawings
Fig. 1 is an electromagnetic rammer-compactor surface structure sketch map of the present invention.
Fig. 2 partly cuts open sketch map for electromagnetic rammer-compactor general assembly of the present invention.
Fig. 3 is electromagnetic rammer-compactor top component assembling sketch map of the present invention.
Fig. 4 is outer thimble of electromagnetic rammer-compactor of the present invention and bottom electromagnet assembling sketch map.
Fig. 5 is electromagnetic rammer-compactor intermediary movements parts assembling sketch map of the present invention.
Fig. 6 is an electromagnetic rammer-compactor pressure head structure sketch map of the present invention.
Fig. 7 feeds the square wave current sketch map for electromagnet in the middle of the present invention.
Among the above-mentioned figure: electromagnet, 12-bottom electromagnet, 13-top annular groove, 14 pilot holes, 15-bottom circular groove, 16-strut kong, the middle square position of 17-, 18-pallet, 19-metal guide rail, 20-bolt, 21-depression bar pilot hole, 22-travel switch, 23-power-supply controller of electric in the middle of 1-top cover, the outer thimble of 2-, 3-metal adapter sleeve, 4-depression bar, 5-pressure head, 6 adpting flanges, 7-dolly joint pin, 8-dolly, 9-handle, 10-top electromagnet, the 11-.
The specific embodiment
To combine accompanying drawing and embodiment that the present invention is done further explain below.
Embodiment 1: a kind of electromagnetic rammer-compactor structure of the present invention comprises casing, pressing plate body, electromagnet, travel switch and dolly like Fig. 1, shown in 2, and described casing is made up of top cover 1 and outer thimble 2, and the lower end of outer thimble is provided with at the bottom of the circular groove; Outer thimble inwall is provided with pilot hole 14; Described pressing plate body is made up of middle square position 17, pressure head 5 and four depression bars 4, square position 17 and pressure heads 5 in the middle of four depression bars 4 connect, and pressure head is at the pressing plate body bottom; Described electromagnet is made up of top electromagnet 10, middle electromagnet 11 and bottom electromagnet 12 referring to Fig. 2; Top component assembling of the present invention is referring to Fig. 3, and described top electromagnet is welded on the top annular groove 13 of top cover 1; Bottom electromagnet is welded on 15 li of bottom, outer thimble lower end circular grooves through sleeve flange, also is provided with strut kong 16, referring to Fig. 4 at the end of the circular groove of shell tube bottom; Middle electromagnet is fixed on the middle square position 17 times of pressing plate body; Place, nearly two ends in 17 movings range of the middle square position of outer thimble inwall correspondence is provided with travel switch 22, the electrical current direction of electromagnet in the middle of the moving range of electromagnet and the change in the middle of limiting through travel switch; Be provided with metal guide rail 19 on the bar of four depression bars 4 corresponding moving range in pilot hole 14, metal guide rail plays the lead effect simultaneously, for middle electromagnet provides electric power; Outer thimble outer cover has metal adapter sleeve 3; Adpting flange 6 through metal adapter sleeve 3 ends is fixed together with the flange of dolly joint pin 7 ends of dolly front end; Have the electrified wire that aperture is used for drawing electromagnet and travel switch on outer thimble 2 walls, said electrified wire is connected on the controller of installing on the dolly 8 23.
Referring to Fig. 5, middle electromagnet is installed between the middle square position 17 and pallet 18 of pressing plate body, and middle electromagnet lower end is fixed on the pallet 18 through bolt 20; Square positions 17 in the middle of four depression bar 4 tops connect, intert in pilot hole 14 at the middle part, is provided with 19, four depression bar lower ends of metal guide rail at the middle part of four depression bars 4 and passes the strut kong 16 of shell tube bottom and be installed in the depression bar pilot hole 21 of pressure head 5; Referring to Fig. 6.
Embodiment 2: the assembling process of a kind of electromagnetic rammer-compactor of the present invention is:
(1) electromagnet assembling: with sleeve, iron core and two electromagnet of coil assembling, winding around on sleeve has the iron core insertion in the sleeve of coil more earlier, and iron core and sleeve interference fit are used for top electromagnet and bottom electromagnet; Magnet spool in the middle of twining with sleeve again is in the middle of iron core is packed into through interference fit in the sleeve of electromagnet; Middle electromagnet bottom is adopted four and is bolted on the pallet.
(2) the shell wound packages is joined: adopt welding manner to be connected with the rounded bottom groove at the bottom of a bottom electromagnet that assembles and the outer thimble earlier; The middle electromagnet that will assemble then is assembled in the outer thimble, and wherein four depression bars connect along four fixing pilot holes 14 in the outer thimble respectively, constitute vertical moving sets, and then pass strut kong 16; Then travel switch is installed in the place, nearly two ends in the moving range of the middle square position of outer thimble inwall correspondence.
(3) pressure head assembling: four depression bar pilot holes 21 on the pressure head 5 are connected with four depression bars respectively, fixedly pressure head.
(4) winding wire of top, centre and bottom electromagnet is guided on the power-supply controller of electric of dolly 8 through having aperture on outer thimble 2 walls.Annular groove welding with remaining top electromagnet and top cover 1 at last is connected, and again they is covered thimble top outside as an overall package.
(5) metal adapter sleeve 3 is enclosed within on the outer thimble 2.
(6) dolly assembling: dolly 8 main bodys, dolly joint pin 7, handle 9, axle, four wheels and power-supply controller of electric 23 are installed.
(7) overall assembling: adopt bolt and packing ring and nut the flange of dolly joint pin 7 front ends and adpting flange 6 machineries of metal adapter sleeve end to be connected, connect all leads, and do the inspection after the integral installation at four articulation holes.Promptly accomplish the assembling of electromagnetic rammer-compactor.
Embodiment 3: the course of work of electromagnetic rammer-compactor of the present invention is: when controller is not supplied power; Middle electromagnet is because gravity is in bottom in the casing; Contact with the lower run switch this moment, after controller powers on, feeds direct current in top electromagnet and the bottom electromagnet; Electromagnet top, top is the S utmost point, and the bottom is the N utmost point; The top of bottom electromagnet is the N utmost point, and the bottom is the S utmost point; The signal that transmits according to travel switch; Controller can be middle electromagnet power supply, and electromagnet top is the S utmost point in the middle of making, and the bottom is the N utmost point; The situation that the top electromagnet gives middle electromagnet repulsion for middle electromagnet suction, bottom electromagnet will appear like this; Electromagnet last time in the middle of impelling, middle current of electromagnet is little, the time is long, so last time is slower because give this moment.When middle electromagnet rising touches the upper run switch on the casing; The signal that controller transmits according to travel switch; In the middle of changing the supplier of electricity of electromagnet to and size of current, electromagnet top is the N utmost point in the middle of making, the bottom is the S utmost point; The situation that the top electromagnet gives middle electromagnet suction for middle electromagnet repulsion, bottom electromagnet will appear like this; The supply current amplitude of adding middle electromagnet this moment is bigger, so middle electromagnet can dash down rapidly, has so just accomplished the following to Ramming operation of one bout.
In top of the present invention electromagnet and bottom electromagnet, feed direct current, electromagnet top, top is the S utmost point, and the bottom is the N utmost point; The top of bottom electromagnet is the N utmost point, and the bottom is the S utmost point; The electric current that is communicated with in the middle electromagnet is the square wave with the direction alternation of varying in size.The size of current that is communicated with in the electromagnet in the middle of described square wave different and the direction alternation is that positive current is big, the time short, and negative current is little, the time is long, referring to Fig. 7.Square wave current size and Orientation alternation is to delay the requirement that rise towards plunging with last time process and acquisition in order to realize under the rammer compacter.Positive current towards the stage is big down, the time short; On scold and the double action of descend inhaling make in the middle of electromagnet reach peak acceleration and impact force; Stage last time negative current is little, the time is long; It is upper in the last double action of inhaling and scolding down middle electromagnet to be got back to, and middle electromagnet motion and then drive pressing plate move up and down in overall, and realize compacting.
Electromagnetic rammer-compactor of the present invention utilizes the principle that the electromagnet same sex is repelled each other, there is a natural attraction between the sexes, adopts three blocks of electromagnet to combine travel switch to accomplish rammer compacter and dashes and process last time down, realizes vibrations, the compacting effect of impacting.This rammer compacter is simple in structure; Easy to control; Can realize that promptly the vibrations compacting can realize impacting compacting again; Have the adjustable characteristics of frequency of impact and vibration amplitude, can be widely used in strengthening the compactness on ground and the occasion of bearing strength through compacting in the infrastructure, be particularly suitable for the scope of operation narrow with require the engineering construction field of the workplace of compacting fast.The present invention can be applicable to other field or equipment through the transformation of structure, such as catalase or impact drilling etc., has very strong expansion.
Claims (6)
1. an electromagnetic rammer-compactor comprises casing, pressing plate body, electromagnet, travel switch and dolly, it is characterized in that: described casing is made up of top cover and outer thimble, and the bottom of outer thimble is provided with the end of a circular groove, and outer thimble inwall is fixed with pilot hole; Described pressing plate body is made up of middle square position, pressure head and four depression bars, square position and pressure head in the middle of four depression bars connect, and pressure head is at the pressing plate body bottom; Described electromagnet is made up of top electromagnet, middle electromagnet and bottom electromagnet, and described top electromagnet is fixed under the top cover, and middle electromagnet is installed between the middle square position and pallet of pressing plate body, and is fixed under the middle square position; Bottom electromagnet is welded on outer thimble bottom through sleeve flange to be had at the end of circular groove; Outer thimble inwall is provided with travel switch; Be provided with metal guide rail on the bar of four depression bars corresponding moving range in pilot hole, metal guide rail also plays lead and act as middle electromagnet power supply; Have aperture on the shell barrel and be used for drawing electrified wire; Outer thimble outside is provided with the metal adapter sleeve; The flange of the adpting flange through metal adapter sleeve end and the dolly joint pin end of dolly front end is fixed together, and the power-supply controller of electric of control rammer compacter operation is installed on the described dolly.
2. a kind of electromagnetic rammer-compactor according to claim 1 is characterized in that: four depression bars of square position and pressure head intert in the pilot hole of outside being arranged on thimble inwall in the middle of described connect.
3. a kind of electromagnetic rammer-compactor according to claim 2 is characterized in that: four depression bars in the described pilot hole are provided with metal guide rail on the bar of corresponding moving range, metal guide rail is made up of internal insulating layer and external conductive medium.
4. a kind of electromagnetic rammer-compactor according to claim 1; It is characterized in that: described travel switch is installed in the place, nearly two ends in the moving range of the middle square position of outer thimble inwall correspondence, the electrical current direction of electromagnet in the middle of the moving range of electromagnet and the change in the middle of limiting through travel switch.
5. a kind of electromagnetic rammer-compactor according to claim 1 is characterized in that: the electric current that is communicated with in described top electromagnet and the bottom electromagnet is a direct current, and electromagnet top, top is the S utmost point, and the bottom is the N utmost point; The top of bottom electromagnet is the N utmost point, and the bottom is the S utmost point; What be communicated with in the middle electromagnet is the square wave current with the direction alternation of varying in size.
6. a kind of electromagnetic rammer-compactor according to claim 5 is characterized in that: the size of current that is communicated with in the electromagnet in the middle of described square wave different and the direction alternation is that positive current is big, the time short, the square wave current that negative current is little, the time is long.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104057768A CN102518116B (en) | 2011-12-08 | 2011-12-08 | Electromagnetic tamper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104057768A CN102518116B (en) | 2011-12-08 | 2011-12-08 | Electromagnetic tamper |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102518116A true CN102518116A (en) | 2012-06-27 |
| CN102518116B CN102518116B (en) | 2013-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104057768A Expired - Fee Related CN102518116B (en) | 2011-12-08 | 2011-12-08 | Electromagnetic tamper |
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| Country | Link |
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| CN (1) | CN102518116B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759233A (en) * | 2016-11-21 | 2017-05-31 | 梁叶青 | A kind of environment-protection type floor tamping unit |
| CN106868991A (en) * | 2017-03-02 | 2017-06-20 | 李爱冰 | A kind of electromagnetic type rammer compacter |
| CN112223807A (en) * | 2020-09-15 | 2021-01-15 | 李冉冉 | Electromagnetic tamper for raw material compaction |
| CN112482349A (en) * | 2020-12-25 | 2021-03-12 | 浙江吉祥建设集团有限公司 | High-rise foundation construction is with according to soil reaction force compaction equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4211284C1 (en) * | 1992-04-03 | 1993-09-30 | Delmag Maschinenfabrik | Electronically controlled ground compactor - uses displacement of steering mass in axial direction of vibrator imbalance weights |
| CN2848940Y (en) * | 2005-12-21 | 2006-12-20 | 舒成 | Linear electric impact ram |
| EP1980671A2 (en) * | 2007-04-12 | 2008-10-15 | Ammann Verdichtung GmbH | Soil compacting device in form of a vibration plate |
| CN201678995U (en) * | 2010-03-17 | 2010-12-22 | 黄道兴 | Electromagnetic vibration rammer |
-
2011
- 2011-12-08 CN CN2011104057768A patent/CN102518116B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4211284C1 (en) * | 1992-04-03 | 1993-09-30 | Delmag Maschinenfabrik | Electronically controlled ground compactor - uses displacement of steering mass in axial direction of vibrator imbalance weights |
| CN2848940Y (en) * | 2005-12-21 | 2006-12-20 | 舒成 | Linear electric impact ram |
| EP1980671A2 (en) * | 2007-04-12 | 2008-10-15 | Ammann Verdichtung GmbH | Soil compacting device in form of a vibration plate |
| CN201678995U (en) * | 2010-03-17 | 2010-12-22 | 黄道兴 | Electromagnetic vibration rammer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759233A (en) * | 2016-11-21 | 2017-05-31 | 梁叶青 | A kind of environment-protection type floor tamping unit |
| CN106759233B (en) * | 2016-11-21 | 2018-11-16 | 浙江鼎大环境科技有限公司 | A kind of environment-protection type floor tamping unit |
| CN106868991A (en) * | 2017-03-02 | 2017-06-20 | 李爱冰 | A kind of electromagnetic type rammer compacter |
| CN112223807A (en) * | 2020-09-15 | 2021-01-15 | 李冉冉 | Electromagnetic tamper for raw material compaction |
| CN112482349A (en) * | 2020-12-25 | 2021-03-12 | 浙江吉祥建设集团有限公司 | High-rise foundation construction is with according to soil reaction force compaction equipment |
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| CN102518116B (en) | 2013-12-11 |
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Granted publication date: 20131211 Termination date: 20161208 |