CN102588241B - Concrete pump and pumping mechanism thereof - Google Patents
Concrete pump and pumping mechanism thereof Download PDFInfo
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- CN102588241B CN102588241B CN201110312493.9A CN201110312493A CN102588241B CN 102588241 B CN102588241 B CN 102588241B CN 201110312493 A CN201110312493 A CN 201110312493A CN 102588241 B CN102588241 B CN 102588241B
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Abstract
The invention discloses a pumping mechanism, which comprises a conveying cylinder, a concrete piston, a main cylinder piston rod, a main cylinder, a main cylinder cover, a sealing piston and an unloading hole. A main oil port is formed on the inner side of the main cylinder cover; one end of the main cylinder piston rod is fixedly connected with the concrete piston, and the other end of the main cylinder piston rod is provided with a guiding hole axially; the sealing piston for closing the main oil port is sleeved in the guiding hole; the unloading hole is arranged on a rodless cavity of the main cylinder; and when the pumping mechanism works normally, the unloading hole is closed, and when the concrete piston is withdrawn, the unloading hole is opened. The invention further discloses a concrete pump comprising the pumping mechanism. When the unloading hole is closed, the rodless cavity of the main cylinder becomes a closed cavity, and the concrete piston is maintained at a working position; and when the unloading hole is opened, oil in the rodless cavity of the main cylinder can freely flow out, and the piston rod of the main cylinder is operated in an inching manner so as to lead the concrete piston to be withdrawn into a water tank. The pumping mechanism is easy in clean or the concrete piston is easily replaced, and the weight of the total pumping mechanism is reduced.
Description
Technical field
The present invention relates to concrete conveyance technical field, particularly relate to pumping mechanism.The invention still further relates to a kind of concrete pump.
Background technique
Concrete pump be a kind of pressure that utilizes by the machinery of concrete along pipeline continus convergence, being mainly used in that room is built, the aspect such as bridge and tunnel construction, is machinery conventional in engineering machinery.Concrete pump is specifically made up of jib, pumping mechanism, hydraulic system, supporting mechanism, automatical control system five part.In pumping mechanism, concrete piston is easily damaged parts, often needs cleaning or changes.Under in working order, concrete piston is in the conveying cylinder of pumping mechanism completely, when needs cleaning or when changing, concrete piston must be retracted into after in water tank from conveying cylinder and just can carry out dismantling, safeguard or changing, so need a kind of pumping mechanism being easier to change concrete piston.
At present, the pumping mechanism of conventional easy replacing concrete piston has three kinds.As the structural representation that Fig. 1, Fig. 1 are the first typical pumping mechanism.
As shown in Figure 1, in this pumping mechanism, concrete piston 2 is all connected by screw or cutting ferrule with connecting rod 22 with main oil cylinder piston bar 4.During normal work, concrete piston 2 does reciprocating linear motion in conveying cylinder.When needs cleaning or when changing concrete piston 2, first connecting rod 22 is pulled down, then crawl operation main oil cylinder piston bar 4 is to left movement, make it near concrete piston 2, and both are connected, last crawl operation main oil cylinder piston bar 4 moves right, and drives concrete piston 2 to be retracted into water tank, can clean concrete piston 2 or change.After cleaning or changing, adopt the inverse process of aforesaid operations to be reinstalled to by concrete piston 2 in conveying cylinder 1, make it remain on normal operation position.
Obviously, it is very inconvenient that this pumping mechanism operates when moving back concrete piston 2, and needed time is longer, all can produce harmful effect to concrete pumping construction and equipment.
See the structural representation that Fig. 2, Fig. 2 are the typical pumping mechanism of the second.
In Fig. 2, this pumping mechanism comprises conveying cylinder 1, concrete piston 2, cutting ferrule 3, main oil cylinder piston bar 4, water tank 5, master cylinder 6, back-up ring 7, limiting piston 8, locating oil cylinder 9, Fuel Tanking Unit 10, one-way valve 11 and selector valve 12.One end of water tank 5 is fixedly connected with conveying cylinder 1, and the other end is fixedly connected with master cylinder 6.Concrete piston 2 can do reciprocating linear motion in conveying cylinder 1, and is connected with main oil cylinder piston bar 4 by cutting ferrule 3 (also by bolt).The affixed locating oil cylinder 9 of end of master cylinder 6, the front end of locating oil cylinder 9 is provided with back-up ring 7, and limiting piston 8 can do reciprocating linear motion in locating oil cylinder 9.Selector valve 12 is arranged at the afterbody of locating oil cylinder 9.When selector valve 12 is in left position, locating oil cylinder 9 is connected with the oil outlet of one-way valve 11; When selector valve 12 is in right position, locating oil cylinder 9 is connected with Fuel Tanking Unit 10.The filler opening of one-way valve 11 is connected with pressure oil-source.
During normal work, selector valve 12 is in left position, hydraulic oil in pressure oil-source enters the back cavity of locating oil cylinder 9 by one-way valve 11, selector valve 12, limiting piston 8 is shifted onto back-up ring 7 place, due to the locking of one-way valve 11, hydraulic oil can not flow out from the back cavity of locating oil cylinder 9, and limiting piston 8 can not be retreated.So when main oil cylinder piston bar 4 moves right and encounters limiting piston 8, main oil cylinder piston bar 4 just limited piston 8 blocks, and makes concrete piston 2 remain on working position.
When needs cleaning or when changing concrete piston 2, control selector valve 12 and commutate to right position, locating oil cylinder 9 is communicated with Fuel Tanking Unit 10, and hydraulic oil freely can flow out from the back cavity of locating oil cylinder 9.Crawl operation main oil cylinder piston bar 4 retreats, and main oil cylinder piston bar 4 just can promote limiting piston 8 always back to the bottom of locating oil cylinder 9, makes concrete piston 2 fall back in water tank 5, can clean concrete piston 2 or change.
After cleaning concrete piston 2 or change, control selector valve 12 and commutate to left position, hydraulic oil enters the back cavity of locating oil cylinder 9 by one-way valve 11, selector valve 12, limiting piston 8 is shifted again onto back-up ring 7 place.Due to the locking of one-way valve 11, hydraulic oil can not flow out from the back cavity of locating oil cylinder 9, and limiting piston 8 can not retreat.After limiting piston 8 encountered by main oil cylinder piston bar 4, just limited piston 8 blocks, and makes concrete piston 2 remain on normal operation position again.
In above-mentioned pumping mechanism, in order to reach the object being easier to change concrete piston 2, being provided with an auxiliary locating oil cylinder 9 at the afterbody of master cylinder 6, significantly increasing the weight of pumping mechanism.Meanwhile, locating oil cylinder 9 makes the length of this pumping mechanism increase, and space required when causing this pumping mechanism to be installed becomes large.
See the structural representation that Fig. 3, Fig. 3 are the third typical pumping mechanism.
As shown in Figure 3, the similar of this pumping mechanism and the second pumping mechanism, be distinguished as: the affixed master cylinder stern transom plate 14 of end of master cylinder 6, the center of master cylinder stern transom plate 14 arranges porose, and its front-end face sets firmly locating oil cylinder 9, thus locating oil cylinder 9 is built in the back cavity of master cylinder 6; Simultaneously, the rear end of main oil cylinder piston bar 4 has the hole that an internal diameter is greater than locating oil cylinder 9 external diameter, be provided with the locating oil cylinder piston rod 13 be connected with limiting piston 8 in hole, locating oil cylinder piston rod 13 is linked together with locating oil cylinder 9 by the locating oil cylinder end cap 15 being assemblied in locating oil cylinder 9 front end.
During normal work, selector valve 12 is in left position, hydraulic oil in pressure oil-source enters the back cavity of locating oil cylinder 9 by one-way valve 11, selector valve 12, limiting piston 8 is shifted onto locating oil cylinder end cap 15 place, due to the locking of one-way valve 11, hydraulic oil can not flow out from the back cavity of locating oil cylinder 9, so limiting piston 8 can not retreat.Just blocked by it when locating oil cylinder piston rod 13 encountered by main oil cylinder piston bar 4, make concrete piston 2 remain on working position.
When needs cleaning or when changing concrete piston 2, control selector valve 12 and be in right position, locating oil cylinder 9 is communicated with Fuel Tanking Unit 10, and hydraulic oil freely can flow out from locating oil cylinder 9.Crawl operation main oil cylinder piston bar 4 retreats, main oil cylinder piston bar 4 can promote locating oil cylinder piston rod 13 and retreat, and drive limiting piston 8 to move to the front end of master cylinder stern transom plate 14 always, make concrete piston 2 be retracted in water tank 5, so just can directly clean concrete piston 2 or change.
After concrete piston 2 is cleaned or is changed, controlling selector valve 12 makes it be in left position, the back cavity of locating oil cylinder 9 is connected with pressure oil-source with selector valve 12 by one-way valve 11, pressure oil enters the back cavity of locating oil cylinder 9 by one-way valve 11 and selector valve 12, limiting piston 8 is shifted again onto locating oil cylinder end cap 15 place, due to the locking of one-way valve 11, hydraulic oil can not flow out from the back cavity of locating oil cylinder 9, and limiting piston 8 can not retreat.Just blocked by it encounter the front end of locating oil cylinder piston rod 13 at the bottom of the hole of main oil cylinder piston bar 4 rear end after, make concrete piston 2 remain on normal operation position again.
Locating oil cylinder 9 in above-mentioned pumping mechanism adopts built-in manner, although shorten the length of master cylinder 6, but this pumping mechanism has the larger hole of diameter at the afterbody of main oil cylinder piston bar 4, higher to the diametric requirements of main oil cylinder piston bar 4, need the working strength of large diameter piston rod guarantee mechanism, this inevitably increases the complete machine weight of this pumping mechanism, and increases the installing space of this pumping mechanism.
How to reduce the complete machine weight of pumping mechanism, become the technical problem that those skilled in the art are badly in need of solving.
Summary of the invention
The invention provides a kind of pumping mechanism, reduce the complete machine weight of pumping mechanism.The present invention also provides a kind of concrete pump comprising above-mentioned pumping mechanism.
To achieve these goals, the invention provides following technological scheme:
A kind of pumping mechanism, comprise conveying cylinder, concrete piston, main oil cylinder piston bar, master cylinder and master cylinder cylinder cap, the inner side of described master cylinder cylinder cap forms main hydraulic fluid port, also comprises packed-piston, unloading port and is in the elastic component of the state of stretching out for controlling described packed-piston; One end of described main oil cylinder piston bar is fixedly connected with described concrete piston, and the other end is provided with pilot hole along the axis of described main oil cylinder piston bar; Described packed-piston for airtight described main hydraulic fluid port is set in described pilot hole; Described unloading port is arranged at the rodless cavity of described master cylinder; When described pumping mechanism normally works, described unloading port is in closed condition, and when moving back described concrete piston, described unloading port is in open mode.
Preferably, also comprise Fuel Tanking Unit and relief switch, described unloading port is communicated with described Fuel Tanking Unit by described relief switch.
Preferably, described relief switch comprises one-way valve and selector valve.
Preferably, described elastic component is helical spring.
Preferably, described helical spring is set in described pilot hole.
Preferably, described helical spring one end is connected with the afterbody of described main oil cylinder piston bar, and the other end is connected with described packed-piston.
Preferably, also comprise the guiding element controlling described packed-piston extrusion, described guiding element is fixed on described main oil cylinder piston bar afterbody.
Preferably, described guiding element is guide sleeve, and described guide sleeve is removably fixedly connected with described main oil cylinder piston bar.
Preferably, the vertical sectional shape of relative with described master cylinder cylinder cap on described packed-piston one end is rectangle or trapezoidal.
In above-mentioned technological scheme, pumping mechanism provided by the present invention comprises conveying cylinder, concrete piston, water tank, main oil cylinder piston bar, master cylinder, main oil cylinder piston, packed-piston, unloading port, elastic component and master cylinder cylinder cap.Described concrete piston one end is positioned at described conveying cylinder, and the other end is fixedly connected with described main oil cylinder piston bar.The two ends of described water tank are connected with described conveying cylinder and described main oil cylinder piston bar respectively.The sheathed main oil cylinder piston of afterbody of described main oil cylinder piston bar, and be axially provided with pilot hole along it.The inner side of described master cylinder cylinder cap forms main hydraulic fluid port.Described packed-piston for airtight described main hydraulic fluid port is set in described pilot hole, and described unloading port is arranged at the rodless cavity of described master cylinder.Described elastic component is in the state of stretching out all the time for controlling described packed-piston.
During normal work, described packed-piston is in the state of stretching out under the effect of elastic component, and described unloading port is in closed state, the described main hydraulic fluid port oil-feed on described master cylinder cylinder cap.When described main oil cylinder piston moves from left to right, described packed-piston moves closer to the outboard end of described master cylinder cylinder cap, described main hydraulic fluid port is closed gradually and becomes a damping port, and under the pressure continuation effect of described master cylinder rodless cavity, the end face of described packed-piston and the end contact of described master cylinder cylinder cap, thus an approximate airtight buffer cavity is formed gradually on the right side of described main oil cylinder piston, stop described main oil cylinder piston to continue to move right, realize the location of the right side limit position of main oil cylinder piston.
When needs cleaning or when changing described concrete piston, control described unloading port and be in open mode, now, described closed chamber is in communication with the outside, and intraluminal fluid force feed can freely flow out; Crawl operates described main oil cylinder piston to be continued to move right, the fluid that described main oil cylinder piston then can promote in former closed chamber flows out, described packed-piston is pressed in described pilot hole gradually simultaneously, main oil cylinder piston compression elastic piece, and then described concrete piston is retracted in described water tank, thus can described concrete piston be directly cleaned or be changed.
After described concrete piston cleaning or replacing, crawl operates described main oil cylinder piston again, makes it to left movement, and then pushes in described conveying cylinder by described concrete piston; Control described unloading port simultaneously and be in closed state, the rodless cavity of described master cylinder is isolated from the outside, between described main oil cylinder piston and described master cylinder cylinder cap, again will form closed chamber, make concrete piston again remain on working position.
Visible, pumping mechanism provided by the invention, eliminate the connecting rod in typical pumping mechanism and locating oil cylinder, take stressed less described packed-piston to described concrete piston limit, therefore the diameter of described main oil cylinder piston bar is less, make the structure of this pumping mechanism compacter, succinct, save the installing space of this pumping mechanism on main frame, effectively reduce the weight of this pumping mechanism.Further, the operation of this pumping mechanism is fairly simple, convenient, quick when cleaning or change described concrete piston, saving of labor, saves time, and substantially increases the working efficiency of this pumping mechanism.
On the other hand, the buffer cavity formed on the right side of the described main oil cylinder piston in this pumping mechanism can provide certain hydraulic cushion power, avoids the mechanical impact between each component, extends the working life of this pumping mechanism, saves its cost.
The pumping mechanism that concrete pump provided by the invention comprises delivery pipe and is connected with described delivery pipe, this pumping mechanism is any one above-mentioned pumping mechanism.Because above-mentioned pumping mechanism has above-mentioned technique effect, the concrete pump with this pumping mechanism also should have corresponding technique effect.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the first typical pumping mechanism;
Fig. 2 is the structural representation of the typical pumping mechanism of the second;
Fig. 3 is the structural representation of the third typical pumping mechanism;
Fig. 4 is the structural representation of pumping mechanism provided by the invention;
Fig. 5 is the view of this pumping mechanism when moving right of the main oil cylinder piston in the present invention;
Fig. 6 is the formation schematic diagram of the closed chamber on the right side of the main oil cylinder piston in the present invention;
Fig. 7 is the view that in the present invention, main hydraulic fluid port oil-feed makes concrete piston normally work;
Fig. 8 is the view of this pumping mechanism when concrete piston is retracted into water tank completely in the present invention;
Fig. 9 is the helical spring another kind of mounting point schematic diagram in the present invention;
Figure 10 is the packed-piston in the present invention and a kind of structural type schematic diagram contacting end face of master cylinder cylinder cap;
Figure 11 is the packed-piston in the present invention and the another kind of structural type schematic diagram contacting end face of master cylinder cylinder cap.
Embodiment
Core of the present invention is to provide a kind of pumping mechanism, reduces the weight of this pumping mechanism, is convenient to cleaning or the replacing of concrete piston, saving of labor, to save time, improve the working efficiency of pumping mechanism, avoid the mechanical impact between component, extend the working life of pumping mechanism, save its cost.Another core of the present invention is to provide a kind of concrete pump comprising above-mentioned pumping mechanism.
See the structural representation that Fig. 4, Fig. 4 are pumping mechanism provided by the invention.
In a kind of embodiment, pumping mechanism provided by the invention comprises conveying cylinder 1, concrete piston 2, cutting ferrule 3, main oil cylinder piston bar 4, water tank 5, master cylinder 6, Fuel Tanking Unit 10, relief switch, main oil cylinder piston 16, packed-piston 18, helical spring 19, unloading port 20 and master cylinder cylinder cap 21.The two ends of water tank 5 are connected with conveying cylinder 1 and master cylinder 6 respectively.Concrete piston 2 is positioned at conveying cylinder 1, can do reciprocating linear motion along the chamber wall of conveying cylinder 1.Main oil cylinder piston bar 4 is arranged in master cylinder 6, and is fixedly connected with by cutting ferrule 3 with concrete piston 2.Main oil cylinder piston 16 is sheathed on the end of main oil cylinder piston bar 4, and can do reciprocating linear motion along the chamber wall of master cylinder 6.Relief switch is for controlling the break-make of master cylinder 6 back cavity and Fuel Tanking Unit 10, and the combination by one-way valve 11 and selector valve 12 realizes its object.
Key point of the present invention is, at the afterbody of main oil cylinder piston bar 4, its axial direction is provided with an elongated pilot hole, and packed-piston 18 is made up of piston head and piston rod, in order to seal the main hydraulic fluid port 22 on master cylinder cylinder cap 21, the piston head relative with main hydraulic fluid port 22 must remain the state of stretching out, and the piston head of the other end is then set in above-mentioned pilot hole.Helical spring 19 is in the elastic component of the state of stretching out all the time as controlling packed-piston 18, its one end is connected with the afterbody of main oil cylinder piston bar 4, and the other end is connected with the piston head of packed-piston 18.It is convenient, reliable that the spring force that helical spring 19 has makes the state of packed-piston 18 control.
In order to realize the spacing of concrete piston 2, this pumping mechanism also comprises the unloading port 20 be arranged on master cylinder cylinder cap 21, and unloading port 20 is communicated with the rodless cavity of master cylinder 6.The working state of selector valve 12 this pumping mechanism changeable.When selector valve 12 is in left position, unloading port 20 is connected with the oil outlet of one-way valve 11, and the filler opening of one-way valve 11 is connected with Fuel Tanking Unit 10; When selector valve 12 is in right position, unloading port 20 is directly connected with Fuel Tanking Unit 10.Above-mentioned Fuel Tanking Unit 10 can be fuel tank or other slightly complicated combined equipment.
See Fig. 5, Fig. 6, Fig. 7, Fig. 5 is the view of this pumping mechanism when moving right of the main oil cylinder piston in the present invention, Fig. 6 is the formation schematic diagram of the closed chamber on the right side of the main oil cylinder piston in the present invention, and Fig. 7 is the view that main hydraulic fluid port oil-feed makes concrete piston normally work.
During normal work, selector valve 12 is in left position, and master cylinder 6 is in off state with the link circuit of Fuel Tanking Unit 10.Now, packed-piston 18 remains on by helical spring 19 state of stretching out.As Fig. 5, main oil cylinder piston 16 drives main oil cylinder piston bar 4 to move from left to right, thus packed-piston 18 is also moved from left to right, makes it move closer to main hydraulic fluid port 22 inside master cylinder cylinder cap 21.When reaching the position shown in Fig. 6, the end face of packed-piston 18 contacts with main hydraulic fluid port 22, main hydraulic fluid port 22 is closed gradually and becomes a damping port, and under the pressure effect of master cylinder 6 rodless cavity, packed-piston 18 contacts completely with the end face of master cylinder cylinder cap 21, by completely closed for main hydraulic fluid port 22, thus form an approximate airtight buffer cavity gradually on the right side of main oil cylinder piston 16.Along with the further motion of main oil cylinder piston bar 4, the area of above-mentioned buffer cavity constantly reduces, and the pressure in chamber constantly increases.When the pressure in buffer cavity is more than or equal to the pressure in master cylinder rod chamber, stopping moves right by main oil cylinder piston 16, realizes the location of limit position on the right side of main oil cylinder piston 16.
When needs cleaning or when changing concrete piston 2, control selector valve 12 and commutate to right position, the buffer cavity on the right side of main oil cylinder piston 16 is communicated with Fuel Tanking Unit 10, and the hydraulic oil in the pressure official post chamber of buffer cavity and Fuel Tanking Unit 10 can freely flow out.See the view that Fig. 8, Fig. 8 are this pumping mechanism when concrete piston is retracted into water tank completely in the present invention.
As shown in Figure 8, crawl operation main oil cylinder piston 16 moves right, its hydraulic oil promoted in buffer cavity is made to flow into Fuel Tanking Unit 10, and then by the pilot hole of the piston rod of packed-piston 18 press-in main oil cylinder piston bar 4 afterbody, main oil cylinder piston bar 4 continues motion, and compression helical spring 19, concrete piston 2 is retracted in water tank 5, so just can open the lid of water tank 5, concrete piston 2 is directly cleaned or changes.
After cleaning concrete piston 2 or change, cover the lid of water tank 5, crawl operation main oil cylinder piston bar 4 is to left movement, concrete piston 2 is pushed in conveying cylinder 1, and controlling selector valve 12 commutation to left position, unloading port 20 and Fuel Tanking Unit 10 are disconnected, and the piston rod of packed-piston 18 stretches out.Crawl operation main oil cylinder piston 16 is to left movement, and the rodless cavity between main oil cylinder piston 16 and master cylinder cylinder cap 21 will form airtight buffer cavity gradually, makes concrete piston 2 again remain on working position.
Known by foregoing description, pumping mechanism provided by the invention, eliminate the connecting rod 22 in typical pumping mechanism and locating oil cylinder 9, take stressed less packed-piston 18 pairs of concrete pistons 2 spacing, so the diameter of main oil cylinder piston bar 4 is less, make the structure of this pumping mechanism compacter, succinct, effectively reduce the weight of pumping mechanism, and save the installing space of this pumping mechanism on main frame.In addition, the operation of this pumping mechanism is fairly simple, and cleaning or convenient, quick when changing concrete piston 2, saving of labor, to save time, substantially increase the working efficiency of this pumping mechanism.
On the other hand, the buffer cavity formed on the right side of the main oil cylinder piston 16 in this pumping mechanism can provide certain hydraulic cushion power, avoids the mechanical impact between each component, extends the working life of this pumping mechanism, provide cost savings.
In concrete technological scheme, except the state being completed unloading port 20 by relief switch is controlled, also unloading port 20 directly can be in communication with the outside, that is, when normally working, unloading port 20 is opened, the rodless cavity of master cylinder 6 is in communication with the outside, when moving back concrete piston 2, by exterior object, unloading port 20 can be blocked, the rodless cavity of main oil cylinder piston bar 16 is isolated from the outside.Though this kind of mode operation is comparatively simple, reliability during its work is then slightly inferior compared with relief switch.Therefore, said structure can be applicable to the comparatively special workplace of minority, in most instances, do not advise using said structure, but this structure is still in protection scope of the present invention.
During concrete enforcement, the relief switch in this pumping mechanism also can adopt switch valve.Switch valve structure is comparatively simple, operates more convenient.
In specific embodiments, the elastic component being in the state of stretching out for controlling packed-piston 18 also can be spring sheet or other structure.The selection of concrete structure can be determined according to factors such as the work loadss of this pumping mechanism.
In preferred version, helical spring 19 also can be arranged in the pilot hole of main oil cylinder piston bar 4 afterbody, is the helical spring another kind of mounting point schematic diagram in the present invention see Fig. 9, Fig. 9.
As shown in Figure 5, helical spring 19 is positioned at the pilot hole set by main oil cylinder piston bar 4 afterbody, and its one end is resisted against pilot hole front end, and the other end is resisted against on the piston head of packed-piston 18.Similarly, the spring force of helical spring 19 can make packed-piston 18 be in the state of stretching out, and can realize the function of this pumping mechanism smoothly.When adopting in this way, the size of helical spring 19 is less, and due to the restriction of pilot hole inwall, and helical spring 19 there will not be and radially bends, and not only reduce further the weight of this pumping mechanism, and has ensured its working strength.
Be understandable that, as long as the length long enough of pilot hole, one end of packed-piston 18 can be positioned at above-mentioned pilot hole all the time, but in order to make packed-piston 18 more reliable with the connection of pilot hole, this pumping mechanism is also provided with guiding element.Guiding element also can be used for the extrusion limiting packed-piston 18.For the ease of connecting, the piston head of packed-piston 18 front end is provided with flange, and the internal diameter of guiding element is less than the external diameter of this flange.
In further technological scheme, above-mentioned guiding element can be guide ring.Guide ring and main oil cylinder piston bar 4 interference fit, the assembling length of guide ring and main oil cylinder piston bar 4 can limit the extrusion of packed-piston 18.Guide ring structure is simple, easy for installation.
In preferred version, guiding element can be replaced guide sleeve 17.Guide sleeve 17 embeds in pilot hole along the axis of main oil cylinder piston bar 4, and there is certain gap with packed-piston 18.Guide sleeve 17 is fixed on the tail end face of main oil cylinder piston bar 4 by the flange portion of its rear end, specifically fixes by screw.The spring force of helical spring 19 makes the flange portion of packed-piston 18 be stuck in the front end of guide sleeve 17, reaches the object of the extrusion of restriction packed-piston 18.In conjunction with the working condition of varying strength, the length that guide sleeve 17 embeds in pilot hole can do corresponding adjustment.Known by above-mentioned analysis, guide sleeve 17 ensure that packed-piston 18 is in pilot hole all the time, makes this pumping mechanism work more reliable.
During concrete enforcement, concrete piston 2 and main oil cylinder piston bar 4 are connected can be replaced by cutting ferrule 3 and are bolted.Be specially, the rear end of concrete piston 2 and the front end of main oil cylinder piston bar 4 all arrange flange, and adopt bolt both to be fixed together.Bolt join strength is higher, and required number of parts is less, and the size of attachment portion is also not too large.
Be understandable that, the structure of the piston head of packed-piston 18 and the contact end face of master cylinder cylinder cap 21 can be various.Be the packed-piston in the present invention and a kind of structural type schematic diagram contacting end face of master cylinder cylinder cap see Figure 10 and Figure 11, Figure 10, Fig. 7 is the packed-piston in the present invention and the another kind of structural type schematic diagram contacting end face of master cylinder cylinder cap.
In Figure 10, the vertical sectional shape of the piston head of packed-piston 18 rear end is trapezoidal, Tu11Zhong, and the vertical sectional shape of the piston head of packed-piston 18 rear end is rectangle.Accordingly, the front-end face of master cylinder cylinder cap 21 can arrange chamfering, also can not arrange chamfering, as long as ensure packed-piston 18 and its intimate contact.
The pumping mechanism that concrete pump provided by the invention comprises delivery pipe and is connected with described delivery pipe, this pumping mechanism is any one above-mentioned pumping mechanism.Because above-mentioned pumping mechanism has above-mentioned technique effect, the concrete pump with this pumping mechanism also should have corresponding technique effect.No longer describe in detail herein.
Above concrete pump provided by the present invention and pumping mechanism thereof are described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a pumping mechanism, comprise conveying cylinder (1), concrete piston (2), main oil cylinder piston bar (4), master cylinder (6) and master cylinder cylinder cap (21), the inner side of described master cylinder cylinder cap (21) forms main hydraulic fluid port (22), it is characterized in that, also comprise packed-piston (18), unloading port (20) and be in the elastic component of the state of stretching out for controlling described packed-piston (18); One end of described main oil cylinder piston bar (4) is fixedly connected with described concrete piston (2), and the other end is provided with pilot hole along the axis of described main oil cylinder piston bar (4); Described packed-piston (18) for airtight described main hydraulic fluid port (22) is set in described pilot hole; Described unloading port (20) is arranged on described master cylinder cylinder cap (21), and is communicated with the rodless cavity of described master cylinder (6); When described pumping mechanism normally works, described unloading port (20) is in closed condition, and when moving back described concrete piston (2), described unloading port (20) is in open mode.
2. according to pumping mechanism according to claim 1, it is characterized in that, also comprise Fuel Tanking Unit (10) and relief switch, described unloading port (20) is communicated with described Fuel Tanking Unit (10) by described relief switch.
3. according to pumping mechanism according to claim 2, it is characterized in that, described relief switch comprises one-way valve (11) and selector valve (12).
4. according to pumping mechanism according to claim 1, it is characterized in that, described elastic component is helical spring (19).
5. according to pumping mechanism according to claim 4, it is characterized in that, described helical spring (19) is set in described pilot hole.
6. according to pumping mechanism according to claim 4, it is characterized in that, one end of described helical spring (19) is connected with the afterbody of described main oil cylinder piston bar (4), and the other end is connected with described packed-piston (18).
7. according to pumping mechanism according to claim 1, it is characterized in that, also comprise the guiding element controlling described packed-piston (18) extrusion, described guiding element is fixed on described main oil cylinder piston bar (4) afterbody.
8. according to pumping mechanism according to claim 7, it is characterized in that, described guiding element is guide sleeve (17), and described guide sleeve (17) is removably fixedly connected with described main oil cylinder piston bar (4).
9. according to pumping mechanism according to claim 1, it is characterized in that, the vertical sectional shape of the upper one end relative with described master cylinder cylinder cap (21) of described packed-piston (18) is rectangle or trapezoidal.
10. a concrete pump, the pumping mechanism comprising delivery pipe and be connected with described delivery pipe, is characterized in that, the pumping mechanism of described pumping mechanism according to any one of claim 1-9.
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| CN201110312493.9A CN102588241B (en) | 2011-10-14 | 2011-10-14 | Concrete pump and pumping mechanism thereof |
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| CN201110312493.9A CN102588241B (en) | 2011-10-14 | 2011-10-14 | Concrete pump and pumping mechanism thereof |
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| CN102927078B (en) * | 2012-10-31 | 2016-01-20 | 三一重工股份有限公司 | A kind of hydraulic jack and there is its pumping mechanism, engineering machinery |
| CN105526157B (en) * | 2015-12-14 | 2017-11-24 | 湖南三一路面机械有限公司 | A kind of concrete piston attachment means and pumping system |
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| CN102588241A (en) | 2012-07-18 |
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