CN103994117B - Hydraulic jack and concrete pumping equipment - Google Patents

Hydraulic jack and concrete pumping equipment Download PDF

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Publication number
CN103994117B
CN103994117B CN201410208305.1A CN201410208305A CN103994117B CN 103994117 B CN103994117 B CN 103994117B CN 201410208305 A CN201410208305 A CN 201410208305A CN 103994117 B CN103994117 B CN 103994117B
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cylinder
hydraulic fluid
fluid port
rear end
piston
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CN103994117A (en
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唐刚明
张炼
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Abstract

The invention discloses a kind of hydraulic jack and concrete pumping equipment, this hydraulic jack includes the piston component in master cylinder cylinder (1) and this master cylinder cylinder, the front end of master cylinder cylinder is provided with fairlead (18), rear end is connected to rear end cover structure, the peripheral part of rear end cover structure is provided with rodless cavity hydraulic fluid port (12), being formed with rod chamber hydraulic fluid port (20) in the peripheral part of fairlead, described rodless cavity hydraulic fluid port and rod chamber hydraulic fluid port are communicated to the rodless cavity (23) in master cylinder cylinder and rod chamber (22) accordingly.In the hydraulic jack of the present invention, no longer rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port are welded on the perisporium of master cylinder cylinder, but are separately positioned in the peripheral part of rear end cover structure and in the peripheral part of fairlead.Owing to the wall thickness of rear end cover structure and fairlead is relatively big, structural strength is high, it is easy to be embedded by hydraulic fluid port wherein, to strengthen the anti-hydraulic shock ability of hydraulic fluid port, not easily causes the problems such as leakage of oil because producing partial structurtes to destroy.

Description

Hydraulic jack and concrete pumping equipment
Technical field
The present invention relates to a kind of oil cylinder, in particular it relates to the hydraulic jack of a kind of built-in positional cylinder, and there is the concrete pumping equipment of this hydraulic jack.
Background technology
It is illustrated in figure 1 the structural representation of a kind of concrete pumping oil cylinder of the prior art.Wherein, this concrete pumping oil cylinder includes master cylinder cylinder 1, main piston 2, proximity switch sensing set 3, piston rod 4 and proximity switch mounting seat 5, master cylinder cylinder 1 is provided with multiple buffering hydraulic fluid port 6,7,8, and the rear end of concrete pumping oil cylinder (left end of Fig. 1) is built-in with positional cylinder, as shown in Figure 2.One end of the location cylinder barrel 13 of this positional cylinder connects rear end cap 10, and the other end stretches in the rodless cavity 23 of master cylinder cylinder 1, and location piston 15 is axially displaceably arranged in the barrel chamber 24 of location cylinder barrel 13.It addition, as shown in Figure 2 and Figure 5, the rear end of master cylinder cylinder 1 is provided with rodless cavity hydraulic fluid port 12, and front end is provided with rod chamber hydraulic fluid port 20 near fairlead 18 and master cylinder gland 19, and this rod chamber hydraulic fluid port 20 connects rod chamber 22.
During cylinder efficient, as it is shown on figure 3, when by control port 9 to input pressure oil in barrel chamber 24, pressure oil promotes location piston 15 to move to the front end of barrel chamber 24, is namely resisted against in the rear end face of piston rod 4 and the location cylinder barrel cylinder bottom plane 131 of Fig. 4.When maintaining the oil liquid pressure of input all the time, location piston 15 will be remained at the position shown in Fig. 3.Now, when the rod chamber hydraulic fluid port 20 input pressure oil of Fig. 5, promote main piston 2, proximity switch sensing set 3 and piston rod 4 to be moved rearwards by, namely bounce back in cylinder, and position piston 15 and define retract stroke when piston rod 4 reclaims, it is prevented that the excessive recovery of piston rod 4.When removing the input pressure of control port 9, promotion is positioned piston 15 and is moved rearwards by by main piston 2, proximity switch sensing set 3 and piston rod 4, until location piston 15 is resisted against on rear end cap 10.
In above-mentioned concrete pumping oil cylinder, the main deficiency existed is:
1), rodless cavity hydraulic fluid port 12 and rod chamber hydraulic fluid port 20 be typically directly welded on the perisporium of master cylinder cylinder 1, by installing oil path block on hydraulic fluid port to connect hydraulic system oil circuit.Operationally, the impact of hydraulic system is big, easily cause the weld cracking between rodless cavity hydraulic fluid port 12, rod chamber hydraulic fluid port 20 and cylinder barrel 1, leakage of oil, this weld cracking occurred as soon as even at the machine product debugging stage, weld cracking feedback rates after using is higher, and can only taking after weld cracking to change whole concrete pumping oil cylinder, maintenance cost is high.
2), as shown in Figure 3 and Figure 4, the raw material blank of location therein cylinder barrel 13 generally can only with solid bar or forging, and waste of material is big;The requirement on machining accuracy of the endoporus (i.e. barrel chamber 24) of location cylinder barrel 13 is high, it is necessary to carries out grinding, and is not a through hole due to endoporus, therefore needs the grinding wheel groove 27 arranged shown in Fig. 4.In the work process of concrete pumping oil cylinder, piston rod 4 is to location piston 15 circulation collision, location piston 15 can be moved rearwards by the moment being subject to piston rod 4 collision, now piston nose face 151, location can depart from and contacting of positioning cylinder barrel cylinder bottom plane 131, the two spaced apart certain axial spacing, as shown in Figure 4.When collision disappears, move forward rapidly under the effect of the pressure oil that location piston 15 passes in control port 9, recover piston nose face 151, location and contacting of positioning cylinder barrel cylinder bottom plane 131.Owing to this collision and movement are repeatedly performed, thus the easy fatigue rupture in grinding wheel groove 27 place, cause location cylinder barrel 13 to produce fracture at grinding wheel groove 27 place.
Summary of the invention
For overcoming above-mentioned weak point, the invention provides a kind of hydraulic jack, and there is the concrete pumping equipment of this hydraulic jack, easily produce the problem that partial structurtes are destroyed solving the hydraulic fluid port of hydraulic jack etc..
For achieving the above object, according to an aspect of the present invention, provide a kind of hydraulic jack, this hydraulic jack includes the piston component in master cylinder cylinder and this master cylinder cylinder, the front end of described master cylinder cylinder is provided with fairlead, rear end is connected to rear end cover structure, wherein, the peripheral part of described rear end cover structure is provided with rodless cavity hydraulic fluid port, the peripheral part of described fairlead is formed rod chamber hydraulic fluid port, described rodless cavity hydraulic fluid port and rod chamber hydraulic fluid port are communicated to the rodless cavity in described master cylinder cylinder and rod chamber accordingly, described fairlead is also formed with rod chamber and crosses oil passage, this rod chamber crosses the described rod chamber of rod chamber hydraulic fluid port described in oil channel connection and described master cylinder cylinder.
Preferably, the perisporium of described master cylinder cylinder is provided with multiple buffering hydraulic fluid ports of axially spaced distribution, and at least part of hydraulic fluid port in the plurality of buffering hydraulic fluid port connects described rodless cavity, and another part hydraulic fluid port connects described rod chamber.
Preferably, described rear end cover structure includes rear end cap and hydraulic fluid port seat, and this hydraulic fluid port seat is connected between described rear end cap and described cylinder barrel, and described rodless cavity hydraulic fluid port is formed in the perisporium of described hydraulic fluid port seat.
Preferably, this hydraulic jack includes location cylinder barrel and is positioned at the location piston of this location cylinder barrel, and described piston component includes main piston and piston rod;
Wherein, described location cylinder barrel is arranged in described rear end cover structure, and the rear end of described location cylinder barrel is connected on the inwall of described rear end cap, and front end extends in described master cylinder cylinder;
The front end of described piston rod is protruding through described fairlead, rear end through described main piston and in can extend into the barrel chamber of described location cylinder barrel to promote described location piston backward;
Further, described rear end cap is additionally provided with the control port being communicated to described barrel chamber, can promote forward described location piston when passing into hydraulic oil.
Preferably, described location cylinder barrel is the cylindrical element of both ends open, and the front end of this location cylinder barrel is connected to positional cylinder end cap, and the rear end of described piston rod can be passed described positional cylinder end cap and stretch in described barrel chamber.
Preferably, described hydraulic fluid port cover for seat is contained on the peripheral part of described location cylinder barrel, and the part before described rodless cavity hydraulic fluid port of described hydraulic fluid port seat and radially spaced setting between the peripheral part of described location cylinder barrel, cross oil passage to be formed for the rodless cavity that has connecting described rodless cavity hydraulic fluid port and described rodless cavity.
Preferably, this hydraulic jack includes proximity switch sensing set and proximity switch mounting seat, described piston rod is multidiameter, this multidiameter is formed the first end difference and the second end difference, described main piston is fixedly mounted on described first end difference, described proximity switch sensing set is sleeved on described piston rod and is axially positioned between described main piston and described second end difference, and described proximity switch mounting seat is arranged on the perisporium of described master cylinder cylinder.
According to another aspect of the present invention, provide a kind of concrete pumping equipment, including pumping oil cylinder and concrete conveying cylinder, described pumping oil cylinder is the hydraulic jack above-mentioned according to the present invention, and the described piston rod of this hydraulic jack passes described fairlead and connects the concrete piston in described concrete conveying cylinder.
Preferably, this concrete pumping equipment includes reversal valve, described reversal valve has oil return opening, connects hydraulic fluid port and pressure oil port, described connection hydraulic fluid port connects the described control port in described hydraulic jack, described pressure oil port is connected to control oil sources, and described reversal valve connects hydraulic fluid port described in switching control and is connected to described oil return opening or described pressure oil port;
Wherein, the connection oil circuit between described pressure oil port and described control oil sources is provided with pressurize check valve, so that the hydraulic oil in described control oil sources can flow to described pressure oil port by described pressurize check valve and reversely end.
According to technique scheme, no longer rod chamber hydraulic fluid port and rodless cavity hydraulic fluid port are welded on the perisporium of master cylinder cylinder in the hydraulic jack of the present invention, but are separately positioned in the peripheral part of rear end cover structure and in the peripheral part of fairlead.Owing to the wall thickness of rear end cover structure and fairlead is relatively big, structural strength is high, it is easy to be embedded by hydraulic fluid port wherein, to strengthen the anti-hydraulic shock ability of hydraulic fluid port, not easily causes the problems such as leakage of oil because producing partial structurtes to destroy.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of concrete pumping oil cylinder of the prior art;
Fig. 2 is the enlarged diagram of left end (rear end) frame portion of the concrete pumping oil cylinder in Fig. 1;
Fig. 3 is that Fig. 2 includes the location piston enlarged diagram at interior frame portion, wherein plunger rod contacts location piston;
Fig. 4 is that Fig. 2 includes the location piston enlarged diagram at interior frame portion, and wherein location piston is moved to the left a segment distance under the collision of piston rod;
Fig. 5 is the enlarged diagram of right-hand member (front end) frame portion of the concrete pumping oil cylinder in Fig. 1;
Fig. 6 is the structural representation of the hydraulic jack according to the preferred embodiment of the present invention;
Fig. 7 is the enlarged diagram of left end (rear end) frame portion of the hydraulic jack in Fig. 6;And
Fig. 8 is the enlarged diagram of right-hand member (front end) frame portion of the hydraulic jack in Fig. 6.
Description of reference numerals
1 master cylinder cylinder 2 main piston
3 proximity switch sensing set 4 piston rods
5 proximity switch mounting seats 6,7,8 cushion hydraulic fluid port
9 control port 10 rear end caps
11 hydraulic fluid port seat 12 rodless cavity hydraulic fluid ports
13 location cylinder barrel 14 rodless cavities cross oil passage
15 location piston 16 holding screws
17 positional cylinder gland 18 fairleads
19 master cylinder gland 20 rod chamber hydraulic fluid ports
21 rod chambers cross oil passage 22 rod chamber
23 rodless cavity 24 barrel chamber
25 reversal valve 26 pressurize check valves
27 grinding wheel grooves 131 position cylinder barrel cylinder bottom plane
151 location piston nose face A connect hydraulic fluid port
P pressure oil port T oil return opening
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
In invention, when not making contrary explanation, the noun of locality " forward and backward " used is the axial fore-and-aft direction for hydraulic jack, and one end that wherein piston rod stretches out is front end, and the other end is rear end.It addition, when not making contrary explanation, the axis direction of the master cylinder cylinder of the hydraulic jack that " axially " refers to.
As shown in Figure 6 to 8, the invention provides a kind of hydraulic jack, including the piston component in master cylinder cylinder 1 and this master cylinder cylinder 1, the front end of master cylinder cylinder 1 is provided with fairlead 18, and rear end is connected to rear end cover structure.The peripheral part of rear end cover structure is provided with rodless cavity hydraulic fluid port 12, the peripheral part of fairlead 18 is formed rodless cavity 23 and rod chamber 22 that rod chamber hydraulic fluid port 20, rodless cavity hydraulic fluid port 12 and rod chamber hydraulic fluid port 20 are communicated in master cylinder cylinder 1 accordingly.Compared to the oil cylinder shown in Fig. 1 to Fig. 5, rod chamber hydraulic fluid port 20 and rodless cavity hydraulic fluid port 12 are no longer welded on the perisporium of master cylinder cylinder 1 by the hydraulic jack of the present invention, but are separately positioned in the peripheral part of rear end cover structure and in the peripheral part of fairlead 18.Owing to the wall thickness of rear end cover structure and fairlead is generally large, structural strength is high, it is easy to be embedded by hydraulic fluid port wherein, to strengthen the anti-hydraulic shock ability of hydraulic fluid port.Such that when making to install oil path block to connect hydraulic system oil circuit on the hydraulic fluid port being embedded, be also not easy to produce partial structurtes and destroy and cause the problems such as leakage of oil.
Wherein, lengthen compared to the axial length of the fairlead 18 in the fairlead 18, Fig. 8 shown in Fig. 5 so that the perisporium of fairlead 18 has enough axial spaces to form rod chamber hydraulic fluid port 20.This rod chamber hydraulic fluid port 20 being radially arranged preferably along master cylinder cylinder 1, is also formed with rod chamber and crosses oil passage 21 in Fig. 8, this rod chamber is crossed oil passage 21 and connected the rod chamber 22 of rod chamber hydraulic fluid port 20 and master cylinder cylinder 1.Fairlead 18 be preferably the front end being welded to master cylinder cylinder 1 and and the inwall of this front end between be provided with fluid sealing member to prevent fluid from revealing, the end of fairlead 18 is fixing connects master cylinder gland 19, to realize end seal, multiple sealing member it is provided with too, to prevent fluid from revealing and to prevent outside liquid, impurity etc. from entering in master cylinder cylinder 1 between the piston rod 4 and the master cylinder gland 19 that stretch out from fairlead 18.
About rodless cavity hydraulic fluid port 12, when rear end cover structure only includes rear end cap 10, can be formed directly in the peripheral part of rear end cap 10.In the present embodiment, rear end cover structure is optimized structural design, to improve structural strength and be easy to processing and install.For this, as it is shown in fig. 7, this rear end cover structure preferably includes rear end cap 10 and hydraulic fluid port seat 11, this hydraulic fluid port seat 11 is connected between rear end cap 10 and cylinder barrel 1, and rodless cavity hydraulic fluid port 12 is then formed in the perisporium of hydraulic fluid port seat 11.Hydraulic fluid port seat 11 can be selected for the material that strength and stiffness are big, can process rodless cavity hydraulic fluid port 12 in hydraulic fluid port seat 11 easily.In other words, by design specialized hydraulic fluid port seat, rodless cavity hydraulic fluid port can be conveniently set and improve oil port structure intensity.Preferably, the wall thickness of the perisporium of hydraulic fluid port seat 11 is more than the wall thickness of master cylinder cylinder 1, in order to arranges hydraulic fluid port and improves hydraulic fluid port impact strength.When mounted, hydraulic fluid port seat 11 can be welded on the rear end of master cylinder cylinder 1 securely, again through the securing member such as bolt or screw, rear end cap 10 is securely joined together with hydraulic fluid port seat 11 and master cylinder cylinder 1, it is achieved the end-enclosed of the rear end of master cylinder cylinder 1.
On the basis of above-mentioned basic structure, the hydraulic jack of present embodiment also has positional cylinder especially, is controlled with the stroke to piston rod 4.As shown in Figure 6 and Figure 7, being provided with location cylinder barrel 13 in the rear end of master cylinder cylinder 1 and be positioned at the location piston 15 of this location cylinder barrel 13, piston component includes main piston 2 and piston rod 4;Wherein, location cylinder barrel 13 is arranged in rear end cover structure, and the rear end of location cylinder barrel 13 is connected on the inwall of rear end cap 10, and front end extends in master cylinder cylinder 1;The front end of piston rod 4 is protruding through fairlead 18, and rear end is through main piston 2 and can extend in the barrel chamber 24 positioning cylinder barrel 13 to promote location piston 15 backward;Further, rear end cap 10 is additionally provided with the control port 9 being communicated to barrel chamber 24, can promote forward location piston 15 when passing into hydraulic oil.Visible, reclaim at piston rod 4 and pass under hydraulic pressure oil condition in control port 9, location piston 15 can stop on a certain stress balance position in the cylinder barrel 13 of location, and the hydraulic fluid pressure suffered by rear end of location piston 15 and the jacking force backward of piston rod 4 suffered by front end produce balance.More commonly, being pass under hydraulic pressure oil condition in control port 9, location piston 15 is promoted by oil liquid pressure and is resisted against the front end of location cylinder barrel 13, i.e. position shown in Fig. 7, namely one of piston rod 4 reclaims extreme position.And when removing the hydraulic oil of control port 9, location piston 15 is pushed backwards to against rear end cap 10 by piston rod 4, so that piston rod 4 reaches another reclaims extreme position.
In the present embodiment, location cylinder barrel 13 has been carried out structure optimization, in order to manufacture and safeguard.As it is shown in fig. 7, this location cylinder barrel 13 is preferably the cylindrical element of both ends open, the front end of this location cylinder barrel 13 is connected to positional cylinder end cap 17, and the rear end of piston rod 4 can be passed positional cylinder end cap 17 and stretch in barrel chamber 24.Trip bolt 16 can be passed through between positional cylinder end cap 17 and location cylinder barrel 13 fix.So, relative to the location cylinder barrel 13 shown in Fig. 2, the location cylinder barrel 13 of the present invention is no longer necessary to adopt the raw material blanks such as solid bar or forging.Owing to the location cylinder barrel 13 of the present invention is simple cylindrical element, barrel chamber 24 two ends are through, thus easy to process, it is to avoid the grinding wheel groove 27 formed in original processing in Fig. 4, and the machining accuracy in the inner core face of barrel chamber 24 is easier to control.By setting up supporting positional cylinder end cap 17, utilized and be spirally connected or during the end of mode the is arranged on location cylinder barrel 13 such as trip bolt 16 is fixing, collision between location piston 15 and positional cylinder end cap 17 causes structural deterioration without to location cylinder barrel 13, at most only need to provide for simple replacement of the trip bolt 16 as accessory and positional cylinder end cap 17, without the location cylinder barrel 13 changed as high accuracy workpiece.
When being provided with location cylinder barrel 13 in the rear end of master cylinder cylinder 1, more firm for the installation making location cylinder barrel 13 and rear end cover structure, hydraulic fluid port seat 11 can be sleeved on the peripheral part of location cylinder barrel 13, snap-in structure can be formed therebetween further.In the present embodiment, preferably along being radially spaced between the peripheral part of the part before rodless cavity hydraulic fluid port 12 of hydraulic fluid port seat 11 and location cylinder barrel 13, cross oil passage 14 to be formed for the rodless cavity that has connecting rodless cavity hydraulic fluid port 12 and rodless cavity 23.So, hydraulic oil can circulate between rodless cavity hydraulic fluid port 12 and rodless cavity 23.But, consider that the speed of piston rod 4 is bigger, and rodless cavity crosses oil passage 14 or rod chamber cross the circulation area of oil passage 21 relatively limited time, flow in or out for convenience of fluid, the perisporium of master cylinder cylinder 1 is provided with multiple buffering hydraulic fluid ports 6 of axially spaced distribution, 7,8, the plurality of buffering hydraulic fluid port 6,7, at least part of hydraulic fluid port connection rodless cavity 23 in 8, and another part hydraulic fluid port connection rod chamber 22.These multiple buffering hydraulic fluid ports 6,7,8 cannot be only used for buffering oil return, it may also be used for repairing in rodless cavity 23 or rod chamber 22.
Additionally, as shown in Figure 6, hydraulic jack in present embodiment may also include proximity switch sensing set 3 and proximity switch mounting seat 5, piston rod 4 is preferably multidiameter, this multidiameter is formed the first end difference and the second end difference, main piston 2 can be fixedly mounted on the first end difference by securing member, and proximity switch sensing set 3 is sleeved on piston rod 4 and is axially positioned between main piston 2 and the second end difference, and proximity switch mounting seat 5 is then arranged on the perisporium of master cylinder cylinder 1.Proximity switch sensing set 3 is constant relative to the position of main piston 2, the sensing proximity switch of movement being sensed set 3 by the proximity switch installed in proximity switch mounting seat 5 detects, the retract stroke of piston rod 4 can be detected in real time or stretch out stroke and stretching speed etc., so that the stroke of piston rod 4 being controlled in conjunction with control port 9, below will address.
On the basis of the above-mentioned hydraulic jack with positional cylinder, present invention also offers a kind of concrete pumping equipment, this concrete pumping equipment includes pumping oil cylinder and concrete conveying cylinder (not shown), pumping oil cylinder is the above-mentioned hydraulic jack with positional cylinder, and the piston rod 4 of this hydraulic jack passes fairlead 18 and connects the concrete piston in concrete conveying cylinder.So, the concrete piston in concrete conveying cylinder is driven to move by pumping the telescopic moving of the piston rod 4 of oil cylinder, thus reciprocal pump concrete.
Referring to Fig. 6, preferably, concrete pumping equipment in present embodiment may also include reversal valve 25, reversal valve 25 in Fig. 6 is preferably two four-way electromagnetic reversing valves, but being not limited to this, it at least has oil return inlet T, connects hydraulic fluid port A and pressure oil port P, connects hydraulic fluid port A and connects the control port 9 in hydraulic jack, pressure oil port P is connected to control oil sources, and described reversal valve 25 connects hydraulic fluid port A for switching control and is connected to oil return inlet T or pressure oil port P.So it is controlled by reversal valve 25 simply to control to pass into pressure oil from control oil sources toward control port 9.Further, for the pressure oil passed in barrel chamber 24 is carried out pressurize, connection oil circuit between pressure oil port P and control oil sources is additionally provided with pressurize check valve 26, sustainable the acting on of the pressure oil passed in barrel chamber 24 flow to pressure oil port P so that the hydraulic oil in control oil sources can pass through pressurize check valve 26 and reversely end, so that can be made to position on piston 15 and so as to maintain position in the figure 7 all the time.
During concrete pumping equipment work, when being in left position when reversal valve 25 (two four-way electromagnetic reversing valves) dead electricity shown in Fig. 6, control the pressure oil of oil sources by pressurize check valve 26, reversal valve 25 is entered via pressure oil port P, control port 9 is flowed out to again from connection hydraulic fluid port A, enter barrel chamber 24, pressure oil promote location piston 15 to the right (forward) move to diagram 7 shown in position, due to the combined effect of pressure oil and pressurize check valve 26, location piston 15 is remained at position shown in Fig. 7.
Now, when pressure oil enters rod chamber 22 by rod chamber hydraulic fluid port 20, pressure oil promotes the motion (backward) together to the left of piston rod 4, proximity switch sensing set 3, main piston 2, to the extreme position of left movement as it is shown in fig. 7, the position that namely left side of piston rod 4 contacts with the right side positioning piston 15.The now effect of positional cylinder limits extreme position when piston rod 4 reclaims exactly, to prevent the concrete piston being connected with piston rod 4 from exiting concrete conveying cylinder.
When reversal valve 25 electric and when being in right position, the pressure oil in barrel chamber 24 passes through control port 9, is connected hydraulic fluid port A and flows to reversal valve 25, then flows out to system hydraulic oil container from oil return inlet T.
Now, when pressure oil enters rod chamber 22 by rod chamber hydraulic fluid port 20, pressure oil promotes the motion (backward) together to the left of piston rod 4, proximity switch sensing set 3, piston 2, when the position that the left side of the piston rod 4 moved to the left as shown in Figure 7 contacts with the right side of location piston 15, due to barrel chamber 24 decompression, promotion is positioned piston 15 by piston rod 4 to be continued to left movement, until the left side of location piston 15 contacts with rear end cap 10.
When piston rod 4 returns to this position, the concrete piston being connected with piston rod 4 exits concrete conveying cylinder, it is simple to change concrete piston.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing; but; the present invention is not limited to the detail in above-mentioned embodiment; in the technology concept of the present invention; technical scheme can being carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to be combined by any suitable mode, in order to avoid unnecessary repetition, various possible compound modes are no longer illustrated by the present invention separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (6)

  1. null1. a hydraulic jack,This hydraulic jack includes the piston component in master cylinder cylinder (1) and this master cylinder cylinder (1),The front end of described master cylinder cylinder (1) is provided with fairlead (18),Rear end is connected to rear end cover structure,It is characterized in that,Described rear end cover structure includes rear end cap (10) and hydraulic fluid port seat (11),This hydraulic fluid port seat (11) is connected between described rear end cap (10) and described master cylinder cylinder (1),The perisporium of described hydraulic fluid port seat (11) is provided with rodless cavity hydraulic fluid port (12),The peripheral part of described fairlead (18) is formed rod chamber hydraulic fluid port (20),Described rodless cavity hydraulic fluid port (12) and rod chamber hydraulic fluid port (20) are communicated to the rodless cavity (23) in described master cylinder cylinder (1) and rod chamber (22) accordingly,Described fairlead (18) is also formed with rod chamber and crosses oil passage (21),This rod chamber is crossed oil passage (21) and is connected the described rod chamber (22) of described rod chamber hydraulic fluid port (20) and described master cylinder cylinder (1);
    This hydraulic jack includes location cylinder barrel (13) and is positioned at the location piston (15) of this location cylinder barrel (13), and described piston component includes main piston (2) and piston rod (4);
    Wherein, described location cylinder barrel (13) is arranged in described rear end cover structure, and the rear end of described location cylinder barrel (13) is connected on the inwall of described rear end cap (10), and front end extends in described master cylinder cylinder (1);
    The front end of described piston rod (4) is protruding through described fairlead (18), rear end through described main piston (2) and in can extend into the barrel chamber (24) of described location cylinder barrel (13) to promote described location piston (15) backward;
    Further, described rear end cap (10) is additionally provided with the control port (9) being communicated to described barrel chamber (24), can promote forward described location piston (15) when passing into hydraulic oil;
    The cylindrical element that described location cylinder barrel (13) is both ends open, the front end of this location cylinder barrel (13) is connected to positional cylinder end cap (17), and the rear end of described piston rod (4) can be passed described positional cylinder end cap (17) and stretch in described barrel chamber (24).
  2. 2. hydraulic jack according to claim 1, it is characterized in that, the perisporium of described master cylinder cylinder (1) is provided with multiple buffering hydraulic fluid ports (6 of axially spaced distribution, 7,8), the plurality of buffering hydraulic fluid port (6,7,8) at least part of hydraulic fluid port in connects described rodless cavity (23), and another part hydraulic fluid port connects described rod chamber (22).
  3. 3. hydraulic jack according to claim 1, it is characterized in that, described hydraulic fluid port seat (11) is sleeved on the peripheral part of described location cylinder barrel (13), and described hydraulic fluid port seat (11) be positioned at radially spaced setting between the part before described rodless cavity hydraulic fluid port (12) and the peripheral part of described location cylinder barrel (13), cross oil passage (14) forming the rodless cavity being used for connecting described rodless cavity hydraulic fluid port (12) and described rodless cavity (23).
  4. 4. hydraulic jack according to claim 1, it is characterized in that, this hydraulic jack includes proximity switch sensing set (3) and proximity switch mounting seat (5), described piston rod (4) is multidiameter, this multidiameter is formed the first end difference and the second end difference, described main piston (2) is fixedly mounted on described first end difference, described proximity switch sensing set (3) is sleeved on described piston rod (4) and above and is axially positioned between described main piston (2) and described second end difference, described proximity switch mounting seat (5) is arranged on the perisporium of described master cylinder cylinder (1).
  5. 5. a concrete pumping equipment, including pumping oil cylinder and concrete conveying cylinder, it is characterized in that, described pumping oil cylinder is the hydraulic jack according to any one in claim 1-4, and the described piston rod (4) of this hydraulic jack passes described fairlead (18) and connects the concrete piston in described concrete conveying cylinder.
  6. 6. concrete pumping equipment according to claim 5, it is characterized in that, this concrete pumping equipment includes reversal valve (25), described reversal valve (25) has oil return opening (T), connects hydraulic fluid port (A) and pressure oil port (P), described connection hydraulic fluid port (A) connects the described control port (9) in described hydraulic jack, described pressure oil port (P) is connected to control oil sources, and described reversal valve (25) connects hydraulic fluid port (A) described in switching control and is connected to described oil return opening (T) or described pressure oil port (P);
    Wherein, connection oil circuit between described pressure oil port (P) and described control oil sources is provided with pressurize check valve (26), so that the hydraulic oil in described control oil sources can be flowed to described pressure oil port (P) by described pressurize check valve (26) and reversely be ended.
CN201410208305.1A 2014-05-16 2014-05-16 Hydraulic jack and concrete pumping equipment Active CN103994117B (en)

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CN109695348B (en) * 2019-01-10 2024-01-30 中交四航局江门航通船业有限公司 Flexible concrete pump pipe integration
CN112324788A (en) * 2019-11-05 2021-02-05 荆门禾硕精密机械有限公司 Application method of manual hydraulic torsion expansion shaft
CN113565823B (en) * 2021-06-17 2024-03-01 宣化钢铁集团有限责任公司 Ladle sliding gate cylinder and ladle gate control device

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