CN201071507Y - Force-bearing disk squeezing and expanding machine - Google Patents

Abstract

The utility model provides an expansion machine of a bearing plate, comprising a supporting frame, a forming mechanism and a hydraulic cylinder; wherein the forming mechanism is provided with two groups of a bow pressing arms symmetrically provided in the axis direction. One end of the bow pressing arm of each group is hinged with the bottom end of the supporting frame, and the other end of the bow pressing arm is pushed by the hydraulic cylinder. A pair of supporting arms are hinged with each other and forms one group of the bow pressing arm. The hydraulic cylinder is provided with a cylinder body and a first piston component moving in the cylinder body to and fro; wherein the first piston component comprises a first piston rod and a first piston. The first piston divides the cylinder body into a first main oil cavity and a second main oil cavity. The first piston component also comprises a second piston component positioned in the first piston rod and moving to and fro; wherein the second piston component comprises a second piston rod and a second piston. The second piston rod is sleeve with the first piston. The second piston divides the first piston rod into a first sub oil cavity communicated with a first main oil cavity and a second sub oil cavity communicated with a second main oil cavity. The expansion machine of the bearing plate in the utility model remarkably improves expansion force under the conditions that the outline and size is not changed and the pressure of the hydraulic system is not changed.

Description

Force-bearing disk squeezing and expanding machine

Technical field

The utility model relates to a kind of equipment that forms Foundation Design with stake, particularly a kind of extruding and expanding machine that forms Foundation Design with the load dish of stake.

Background technology

In the existing basic engineering construction, the method that formation has the stake of load dish is: at first form pile body hole by auger cutting soil body in the basis, then force-bearing disk squeezing and expanding machine is lowered into the appropriate location in a hole, the soil body around the stake hole is applied lateral compression power and the space of extruding dish type in the pile body hole side by builder, can a plurality of such disc space be set along the pile body hole vertical direction, this side has the stake that forms behind the perfusion concrete in the disc space stake hole and is called as compacted bearing disk pile, compare common filling pile, compacted bearing disk pile not only can increase substantially the supporting capacity of pile foundation, and saves constructional materials and reduce engineering quantity about 50% in construction.

The structure of this force-bearing disk squeezing and expanding machine mainly comprises builder and hydraulic cylinder, builder has pressure head and the two group bow pressing arms hinged with pressure head, two groups of bow pressing arms are along vertical symmetric arrangement, every group of bow pressing arm is made of two support arms up and down that are hinged, hydraulic cylinder moves along vertical by promoting pressure head, thereby it is protruding to promote two groups of bow pressing arms, so that the soil body around the extruding pile body hole forms disc space.

The structure of the hydraulic cylinder that generally uses in the existing force-bearing disk squeezing and expanding machine is: comprise cylinder body, a piston component that moves back and forth is set in the cylinder body, comprise piston rod and the piston that is fixedly mounted on the piston rod, piston will be separated into former and later two chambers in the cylinder body, when rear chamber's oil-feed, when front chamber is fuel-displaced, the promotion piston forward moves, thereby promotes piston rod reach, thrust output; When front chamber's oil-feed and rear chamber when fuel-displaced promotes piston to move backward, be withdrawn in the cylinder body thereby promote piston rod.

The problem that this structure exists is: the thrust of hydraulic cylinder output is subjected to the restriction of hydraulic system pressure, runs into hard in construction or during soil property that viscosity is bigger, can't realize squeezed construction because resistance is excessive, has limited the application of force-bearing disk squeezing and expanding machine; Because squeezed power is limited, makes the length of squeezed arm be restricted, and is unfavorable for increasing disk track and effective bearing area, thereby has limited the supporting capacity of compacted bearing disk pile.

Because the thrust of hydraulic cylinder output is subjected to the restriction of hydraulic system pressure, under the certain prerequisite of hydraulic system pressure, on the one hand, in order to improve the thrust of hydraulic cylinder output, then must increase the work area of piston, promptly increase piston diameter, therefore increase the physical dimension of piston and oil cylinder, cause that the force-bearing disk squeezing and expanding machine size increases, manufacturing cost improves, use inconvenience, and bring difficulty for transportation and construction; On the other hand, if do not change the physical dimension of oil cylinder, in order to improve the thrust of hydraulic cylinder output, then need the oil pump that adopts pressure higher, cause cost of production to improve equally, owing to adopt high-pressure pump, the pressure of hydraulic system improves in addition, cause the sealing of hydraulic cylinder to be easy to reveal, therefore hermetically-sealed construction has been proposed requirements at the higher level.

The utility model content

The purpose of this utility model provides a kind of force-bearing disk squeezing and expanding machine, under and the situation that hydraulic system pressure is constant constant in force-bearing disk squeezing and expanding machine appearance and size, can significantly improve the squeezed power of force-bearing disk squeezing and expanding machine output.

For realizing the utility model purpose, the utility model provides a kind of force-bearing disk squeezing and expanding machine on the one hand, and have cylinder body and be arranged on the interior first piston assembly of cylinder body, wherein cylinder body one end sealing, the other end is fixed with first fairlead; The first piston assembly comprises the first piston bar that can move back and forth and is arranged on the first piston of first piston bar one end under the first fairlead guide effect, first piston has into separately with being separated in the cylinder body, the first main oil pocket of oil outlet and the second main oil pocket, the second main oil pocket is in abutting connection with sealing one end of cylinder body, it is characterized in that the first piston bar is the tubular of end sealing, also have: second piston component that relative first piston assembly axially moves back and forth, be placed in the internal cavities of first piston bar, comprise second piston rod and second piston, described first piston is sleeved on second piston rod and can slides along it, and second piston is separated into the internal cavities of first piston bar the second secondary oil pocket of the first secondary oil pocket and the described first piston rod seal end of adjacency.

Wherein, the hinged pressure head of the other end of every group of bow pressing arm, pressure head links to each other with the first piston bar, so that move back and forth realization by cylinder pushes by the first piston bar.Wherein, the pressure head side is provided with slide block, contacts so that pressure head is being led with the inner surface of fuselage by slide block.Pressure head links to each other with the first piston bar by bearing pin.

Wherein the first main oil pocket is communicated with the first secondary oil pocket, and the second main oil pocket is communicated with the second secondary oil pocket.

Realize that by the first oil transportation road that runs through first piston bar bar wall the first main oil pocket is communicated with the first secondary oil pocket; Be communicated with by the second oil transportation road, the realization second main oil pocket and the second secondary oil pocket that runs through second piston rod.

First piston comprise piston portion and embed piston portion inner and with it fixing all-in-one-piece guide part, first piston is sleeved on second piston rod by guide part, piston portion contacts also and can endwisely slip along the inwall of cylinder body with the inboard wall of cylinder block sealing.

The first piston bar comprises interfix all-in-one-piece first piston bar main part and formation first piston rod seal connecting portion end and that stretch to the cylinder body outside.

On the other hand, the utility model provides a kind of force-bearing disk squeezing and expanding machine, comprise fuselage, be installed in builder and hydraulic cylinder in the fuselage, wherein builder has symmetrically arranged vertically two groups of bow pressing arms, one end of two groups of bow pressing arms and the bottom of fuselage are hinged, the other end is by cylinder pushes, every group of bow pressing arm by a pair of support arm, being hinged forms; Hydraulic cylinder has cylinder body and is arranged on the interior first piston member of cylinder body, wherein cylinder body one end sealing, and the other end is provided with first fairlead; The first piston member comprises the piston portion that can do the bar portion that axially moves back and forth under the guiding of first fairlead and be positioned at bar portion one end, its both sides vertically of piston portion form to have into separately, the first main oil pocket of oil-out and the second main oil pocket, the second main oil pocket is in abutting connection with sealing one end of cylinder body, it is characterized in that the bar portion of first piston member is the tubular of end sealing, also comprise: the first piston members shaft is to moving back and forth second piston component relatively, be placed in the internal cavities of first piston member bar portion, have the second piston component bar portion and the second piston component piston portion, first piston piece piston portion is sleeved in the second piston component bar portion and can slides along it, and the second piston component piston portion both sides vertically form first secondary oil pocket that is communicated with the first main oil pocket and the second secondary oil pocket that is communicated with the second main oil pocket respectively.

The first oil transportation road of the wall by running through first piston member bar portion makes the first main oil pocket be communicated with the first secondary oil pocket; Make the connection of the second main oil pocket and the second secondary oil pocket by the second oil transportation road that passes the second piston component bar portion.

Having the following advantages of the utility model force-bearing disk squeezing and expanding machine:

The utility model is owing to used boosting oil cylinder, this boosting oil cylinder has been set up one group of new piston component or member in the inside of original one group of piston component or member, increased the lifting surface area of first piston assembly by new piston component, its lifting surface area is substantially equal to big piston area and valve piston area sum, therefore do not changing under the hydraulic cylinder appearance and size situation identical with hydraulic system pressure, can significantly improve the thrust of hydraulic cylinder by the output of first piston assembly, avoided in construction, running into hard or during soil property that viscosity is bigger, make force-bearing disk squeezing and expanding machine can't realize the problem of squeezed construction owing to resistance is excessive; Therefore avoided owing to the problem that the limited length that causes squeezed arm of squeezed power is restricted can increase load dish disk track and effective bearing area by improving the length of squeezed arm, thereby significantly improve the supporting capacity of compacted bearing disk pile.

In addition, because the utility model force-bearing disk squeezing and expanding machine is not changing the thrust that significantly improves hydraulic cylinder output under hydraulic cylinder appearance and size and the hydraulic system pressure situation, therefore avoided because of hydraulic cylinder appearance and size us to increase or hydraulic system pressure improves the force-bearing disk squeezing and expanding machine manufacturing cost that causes and improves, uses inconvenience and give transportation and construction brings the problem of difficulty.

Brief Description Of Drawings

Fig. 1 is the longitudinal sectional view of the boosting oil cylinder of force-bearing disk squeezing and expanding machine of the present invention, and wherein the big piston bar is in the state that is recovered to cylinder interior;

Fig. 2 is the schematic diagram of force-bearing disk squeezing and expanding machine of the present invention;

Description of reference numerals: 1, big piston bar; 2, big fairlead; 3, valve piston; 4, small piston rod; 5, cylinder body; 6, little fairlead; 7, big piston ante-chamber; 8, big piston back cavity; 9, valve piston ante-chamber; 10, the first oil transportation road; 11, valve piston back cavity; 12, big piston bar main part; 13, the second oil transportation road; First segmentation in 13a, the second oil transportation road; Second segmentation in 13b, the second oil transportation road; 14, big piston; 15, cylinder cap: 16, big piston bar connecting portion; 17, the turnover oilhole of big piston back cavity; 18, the turnover oilhole of big piston ante-chamber; 20, boosting oil cylinder; 21, pressure head; 22, slide block; 23, bearing pin; 24, fuselage; 25, first bow pressing arm; 26, second bow pressing arm.

The specific embodiment

Below with reference to specific embodiment the utility model is described in detail.

As shown in Figure 1, Fig. 1 is the longitudinal sectional view of boosting oil cylinder in the utility model force-bearing disk squeezing and expanding machine.Boosting oil cylinder comprises circle tube cylinder 5, cylinder body 5 has two ends respect to one another vertically, wherein an end is by integrally welded and by cylinder cap 15 sealings with cylinder cap 15, the other end is provided with it fixedly big fairlead 2 of all-in-one-piece, and O ring back-up ring a4 and O-ring seals a5 are set between the external surface of big fairlead 2 and cylinder body 5 inner surfaces.

Be provided with in the cylinder body 5 and its coaxial substantially big piston bar 1, big piston bar 1 comprises big piston bar main part 12 and connecting portion 16, and big piston bar main part 12 is the cylindrical shape that inside has cylindrical cavity.Be provided with in the cavity of big piston bar main part 12 and its coaxial substantially cylindrical small piston rod 4.Have a determining deviation between the external surface of big piston bar main part 12 and the inner surface of cylinder body 5, make to form axial cylindrical cavity between cylinder body 5 and the big piston main part 12; Have a determining deviation between the inner surface of big piston bar main part 12 and the inner surface of small piston rod 4, make to form axial cylindrical cavity between big piston bar main part 12 and the small piston rod 4.

Big piston bar main part 12 has the first relative vertically end and second end, wherein, fixedly connected between the connecting portion 16 of first end and big piston bar 12, for example by being welded to connect, and the external diameter of connecting portion 16 is identical with the external diameter of big piston bar main part 12, thereby form the big piston bar 1 of one, big fairlead 2 inside set gradually the piston rod of polyurethane material vertically with the support ring a2 of sealing a1, polyformaldehyde material, this special envelope a3 of polyurethane material, make to form sealing between big piston bar 1 external surface and big fairlead 2 inner surfaces; The big piston 14 that the second end setting is fixedlyed connected with it, big piston 14 whole cylindrical structures, big piston 14 can be fixed by welding in second end of big piston bar main part 12, the external diameter of big piston 14 equates with the internal diameter of cylinder body 5, and can in cylinder body, move back and forth so that drive big piston bar 1 and move back and forth, sealing ring a16 and guidance tape a17 are set between the inner surface of the external surface of big piston 14 and cylinder body 5, and sealing circle a16 can adopt the Ge Laiquan that is made by polyurethane material.

Big piston 14 is cylindrical structure substantially, the little fairlead 6 of its positioned inside, and little fairlead 6 can be fixing by screw and big piston 14.Little fairlead 6 is sleeved on the small piston rod 4, and can move back and forth vertically by relative its on small piston rod 4.The external surface of little fairlead 6 sets gradually O ring back-up ring a14, O-ring seals a15 vertically, makes to form between the inner surface of little fairlead 6 and big piston 14 to seal; The inner surface of little fairlead 6 is provided with Supporting ring a12, piston rod with sealing a13, this special envelope a19, O-ring seals a20, makes to form sealing between the external surface of little fairlead inner surface and small piston rod 4.

Small piston rod 4 has the first relative vertically end and second end, wherein, the external surface of first end is fixed with valve piston 3, the external surface of valve piston 3 is arranged guidance tape a8 and Ge Lai circle a9 successively vertically, make valve piston 3 in big piston bar main part 12 inner cylindrical chambeies, to move back and forth vertically, form sealing simultaneously between the inner surface of the external surface of valve piston 3 and big piston bar main part 12 with respect to the big piston bar.Little fairlead 6 is sleeved on second end of small piston rod 4.

Fixedly form big piston back cavity 8 between the cylinder cap 15 of the same side of all-in-one-piece big piston 14 and little fairlead 6 and closed cylinder 5 one ends; The inboard of the opposite side of big piston 14 and big fairlead 2 can be referred to as big piston ante-chamber 7 with the cylindrical cavity 7 that the cavity that forms between cylinder body 5 inner surfaces and big piston bar main part 12 external surfaces seals; The cylindrical cavity 9 that the opposite side of little fairlead 6 and a side of valve piston 3 are sealed the space between big piston bar main part 12 inner surfaces and small piston rod 4 external surfaces can be referred to as valve piston ante-chamber 9; The cylindrical cavity that forms between the inboard of valve piston 3 opposite sides and connecting portion 16 is called valve piston back cavity 11.

Near the position of big piston 14 the first oil transportation road 10 is set on the bar wall of big piston bar main part 12, is communicated with by the first oil transportation road 10 between big piston ante-chamber 7 and the valve piston ante-chamber 9.

Small piston rod 4 inside are provided with the second oil transportation road, the second oil transportation road is made up of two segmentations that communicate with each other, comprise along the second segmentation 13b of small piston rod 4 axially extended first segmentation 13a and extension perpendicular to axial direction, the first segmentation 13a is communicated with valve piston back cavity 11, and the second segmentation 13b is positioned at second end of small piston rod 4, and is communicated with big piston back cavity 8.Therefore, be communicated with by the second oil transportation road 13a, 3b between big piston back cavity 8 and the valve piston back cavity 11.

The course of work of boosting oil cylinder in the utility model force-bearing disk squeezing and expanding machine is described below.

Again referring to Fig. 1, when oil cylinder is in state shown in Figure 1, when switching to, the reversal valve of oil cylinder makes oil-feed in the big piston back cavity 8 and the fuel-displaced operating position of big piston plug ante-chamber 7, then oil-feed in the big piston back cavity 8, big piston ante-chamber 7 and the valve piston ante-chamber 9 that is communicated with big piston ante-chamber 7 by the first oil transportation road 10 are fuel-displaced, piston portion by promoting all-in-one-piece big piston 14 and little fairlead 6 respectively along cylinder body 5 inner surfaces and small piston rod 4 external surfaces towards (promptly away from the direction of cylinder cap 15, towards illustrated left) endwisely slip, promote big piston bar 1 thus (promptly vertically towards the axial outside of cylinder body, towards illustrated left) also do moving away from cylinder cap 15, oil in the big piston back cavity 8 is by the second oil transportation road 13a simultaneously, 13b enters valve piston back cavity 11, make and promote 11 oil-feeds of valve piston back cavity big piston bar 1 by the connecting portion 16 that promotes big piston bar 1 thus and move forward vertically.

This shows that under the constant situation of oil pressure, the utility model has increased the thrust that the big piston bar is exported by increasing the active area (prior art be the big piston area only, and the utility model comprises big piston area and valve piston area) of piston.Promptly, big piston 14 by making big piston bar main part 12 second ends and little fairlead 6 and the connecting portion 16 that is positioned at its first end are subjected to forward the thrust of (illustrated left) simultaneously, make big piston bar 1 under the effect of double reaction plus, move forward and stretch out cylinder body, finally move to position shown in Figure 2, make hydraulic cylinder thus under the constant situation of hydraulic cylinder appearance and size and system pressure, realized the effect of reinforcement.

When promoting big piston bar 1,8 oil-feeds of big piston back cavity move forward to when being in the extreme position that stretches out outside the cylinder body, withdraw in cylinder body 5 in order to make big piston bar 1, the reversal valve of oil cylinder switched to make 7 oil-feeds of big piston ante-chamber and the fuel-displaced operating position of big piston back cavity 8, big piston ante-chamber 7 and valve piston ante-chamber 9 oil-feeds that are communicated with by the first oil transportation road 10 with big piston ante-chamber 7, big piston back cavity 8 and simultaneously by the second oil transportation road 13a, the valve piston back cavity 11 that 13b is communicated with big piston back cavity 8 is fuel-displaced, the piston portion and the little fairlead 6 that promote all-in-one-piece big piston 14 thus endwisely slip towards cylinder cap 15 along cylinder body 5 inner surfaces and small piston rod 4 external surfaces respectively, promotion big piston bar 1 moves vertically and is withdrawn into cylinder body 5 inside, finally gets back to position shown in Figure 1.

Although the drive medium that above-mentioned the utility model boosting oil cylinder adopts can be pressure oil, it will be appreciated by those skilled in the art that drive medium also can adopt compressed air.

Fig. 2 is the structural representation in the utility model force-bearing disk squeezing and expanding machine, and the structure and the course of work thereof of this force-bearing disk squeezing and expanding machine of the utility model is described with reference to Fig. 2.

The utility model force-bearing disk squeezing and expanding machine comprises fuselage 24, builder and is fixed on fuselage 24 right-hand members and to the boosting oil cylinder 20 of builder applied thrust.

Fuselage 24 is cylindric, builder is placed in fuselage 24 inside of extruding and expanding machine, comprise the two symmetrical groups bow pressing arm vertically is set, every group of bow pressing arm comprises first pressure arm 25 and second bow pressing arm 26 of the mutual hinge of an end, the other end of first bow pressing arm 25 and pressure head 21 are hinged, and the other end of second bow pressing arm 26 is fixed in the left end of fuselage 24.When extruding and expanding machine is not worked, first, second bow pressing arm 25,26 be in regain in the fuselage 24 the position, shown in solid line among Fig. 2.

The first piston bar connecting portion 16 of boosting oil cylinder 20 has protuberance, the protuberance of connecting portion 16 is established and axial vertical axis hole, by the bearing pin 23 that passes axis hole it is linked to each other with the pressure head 21 of builder, by screw slide block 22 is installed on the pressure head 21, when first piston bar 1 moves back and forth and when driving pressure head and moving, slide block 22 slides along the inwall of fuselage 24 right-hand members.

During construction, at first in foundation soil body, get out a hole by drilling equipment, then with force-bearing disk squeezing and expanding machine (left end down, right-hand member is in a last hole of vertically putting into.When by oil pump when big piston back cavity 8 and valve piston back cavity 11 are pressed into oil, big piston ante-chamber 7 and valve piston ante-chamber 9 are fuel-displaced, first piston bar 1 is in big piston back cavity 8 and valve piston back cavity 11 under the oil pressure acting in conjunction, vertically move down, thereby promote two groups of first, second bow pressing arms 25,26 to the outside extrusion of fuselage, be in the position shown in Fig. 2 dotted line, thereby the sidepiece in the plumb pile hole forms load dish slotted eye.In the foundation soil body of stake hole sidepiece, form after the load dish slotted eye, to switch to by reversal valve and to make oil pump to big piston ante-chamber 7 fuel feeding, 7 oil-feeds of big piston ante-chamber, first oil transportation road 10 oil-feeds of valve piston ante-chamber 9 by communicating with big piston ante-chamber 7, big piston back cavity 8 and by the second oil transportation road 13a, the valve piston back cavity 11 that 13b communicates with big piston back cavity 8 is fuel-displaced, make first piston bar 1 in big piston ante-chamber 7 and valve piston ante-chamber 9 under the oil pressure acting in conjunction thus, vertically move up, thereby promote two group first, second bow pressing arm 25,26 are recovered to the fuselage inside and outside, finally get back to the position shown in Fig. 2 solid line.

Claims (10)

1. a force-bearing disk squeezing and expanding machine comprises fuselage (24), is installed in builder (25,26) and hydraulic cylinder (20) on the fuselage, wherein

Builder has symmetrically arranged vertically two groups of bow pressing arms, and an end of two groups of bow pressing arms and the bottom of fuselage are hinged, and the other end is by cylinder pushes, and be hinged forms every group of bow pressing arm by a pair of support arm (25,26);

Hydraulic cylinder has cylinder body (5) and is arranged on the interior first piston assembly (1,14) of cylinder body, wherein cylinder body (5) one ends sealing, and the other end is fixed with first fairlead (2); The first piston assembly comprises the first piston bar (1) and the first piston (14) that can move back and forth under first fairlead (2) guide effect, first piston (14) will be separated into the first main oil pocket (7) and the second main oil pocket (8) that has separately into and out of oilhole (18,17) in the cylinder body (5), the second main oil pocket (8) is in abutting connection with sealing one end of cylinder body, it is characterized in that the first piston bar is the tubular of end sealing, also has:

Second piston component (3,4) that relative first piston assembly (1,14) axially moves back and forth, be placed in the internal cavities of first piston bar (1), comprise second piston rod (4) and second piston (3), described first piston (14) is sleeved on second piston rod (4) and goes up also and can slide along it, and second piston (3) is separated into the internal cavities of first piston bar (1) the second secondary oil pocket (11) of the first secondary oil pocket (9) and adjacency described first piston bar (1) blind end.

2. force-bearing disk squeezing and expanding machine as claimed in claim 1, it is characterized in that: the hinged pressure head of the other end of every group of bow pressing arm (21), described pressure head (21) links to each other with first piston bar (1), so that by described first piston bar move back and forth the promotion pressure head, extend laterally to the fuselage outside thereby promote every group of bow pressing arm.

3. force-bearing disk squeezing and expanding machine as claimed in claim 2 is characterized in that: described pressure head (21) side is provided with slide block (22), contacts with the inner surface of fuselage so that pressure head (21) is led by described slide block.

4. as claim 2 or 3 described force-bearing disk squeezing and expanding machines, it is characterized in that: described pressure head (21) links to each other with described first piston bar (1) by bearing pin (23).

5. as the arbitrary described force-bearing disk squeezing and expanding machine of claim 1 to 3, it is characterized in that:

The described first main oil pocket (7) is communicated with the described first secondary oil pocket (9), and the second main oil pocket (8) is communicated with the second secondary oil pocket (11).

6. as the arbitrary described force-bearing disk squeezing and expanding machine of claim 1 to 3, it is characterized in that:

By the first oil transportation road (10) that runs through described first piston bar (1) bar wall the described first main oil pocket (7) is communicated with the described first secondary oil pocket (9); By the second oil transportation road (13a, 13b) that runs through described second piston rod (4) the described second main oil pocket (8) and the described second secondary oil pocket (11) are communicated with.

7. as the arbitrary described force-bearing disk squeezing and expanding machine of claim 1 to 3, it is characterized in that: described first piston (14) comprise piston portion and embed piston portion inner and with it fixing all-in-one-piece guide part (6), described first piston (14) is sleeved on described second piston rod (4) by described guide part (6), and described piston portion contacts with cylinder body (5) inner wall sealing and can endwisely slip along the inwall of cylinder body (5).

8. as the arbitrary described force-bearing disk squeezing and expanding machine of claim 1 to 3, it is characterized in that: described first piston bar (1) comprises the connecting portion (16) of interfix all-in-one-piece first piston bar main part (12) and formation described first piston bar (1) blind end.

9. a force-bearing disk squeezing and expanding machine comprises fuselage (24), is installed in builder (25,26) and hydraulic cylinder (20) on the fuselage, wherein

Builder has symmetrically arranged vertically two groups of bow pressing arms, and an end of two groups of bow pressing arms and the bottom of fuselage are hinged, and the other end is by cylinder pushes, and be hinged forms every group of bow pressing arm by a pair of support arm (25,26);

Hydraulic cylinder has cylinder body (5) and is arranged on the interior first piston member (1) of cylinder body, wherein cylinder body (5) one ends sealing, and the other end is provided with first fairlead (2); First piston member (1) comprises and can do bar portion (1) that axially moves back and forth and the piston portion (14) that is positioned at bar portion one end under first fairlead (2) guiding, its both sides vertically of piston portion form the first main oil pocket (7) and the second main oil pocket (8) that has separately into and out of hydraulic fluid port (18,17), the second main oil pocket (8) is in abutting connection with sealing one end of cylinder body, it is characterized in that the bar portion of first piston member is the tubular of end sealing, also comprises:

First piston member (1,14) axially moves back and forth second piston component (3,4) relatively, be placed in the internal cavities of first piston member bar portion (12), have the second piston component bar portion (4) and the second piston component piston portion (3), the second piston component bar portion (4) that is sleeved on of first piston piece piston portion (14) goes up and can slide along it, and second piston component piston portion (3) both sides vertically form first secondary oil pocket (9) that is communicated with the first main oil pocket and the second secondary oil pocket (11) that is communicated with the second main oil pocket respectively.

10. force-bearing disk squeezing and expanding machine as claimed in claim 9 is characterized in that: the first oil transportation road (10) of the wall by running through described first piston member bar portion (12) makes the described first main oil pocket (7) be communicated with the described first secondary oil pocket (9); By the second oil transportation road (13a, 13b) that passes the described second piston component bar portion (4) the described second main oil pocket (8) and the described second secondary oil pocket (11) are communicated with.

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