WO2012094895A1 - 多级伸缩机构以及工程设备 - Google Patents
多级伸缩机构以及工程设备 Download PDFInfo
- Publication number
- WO2012094895A1 WO2012094895A1 PCT/CN2011/078665 CN2011078665W WO2012094895A1 WO 2012094895 A1 WO2012094895 A1 WO 2012094895A1 CN 2011078665 W CN2011078665 W CN 2011078665W WO 2012094895 A1 WO2012094895 A1 WO 2012094895A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hydraulic cylinder
- stage telescopic
- stage
- telescopic member
- hydraulic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/72—Counterweights or supports for balancing lifting couples
- B66C23/78—Supports, e.g. outriggers, for mobile cranes
- B66C23/80—Supports, e.g. outriggers, for mobile cranes hydraulically actuated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
- F15B2211/783—Sequential control
Definitions
- the present invention relates to the field of engineering equipment, and in particular to a multi-stage telescopic mechanism for engineering equipment and an engineering apparatus including the multi-stage expansion mechanism.
- Background Art Currently, in many work transportation equipment, in order to meet the needs of engineering work, it is necessary to equip these engineering equipment with a telescopic support mechanism to stably support the equipment during engineering work. Taking the concrete pump truck as an example, after many years of development of the concrete pump truck, the length of the boom of the pump truck has been growing more and more. Due to the increase of the length of the pump boom, in order to ensure the stability of the whole pump truck, it is necessary.
- the length of the leg should be increased accordingly.
- the secondary telescopic legs that have been used in the past can no longer meet the length of the leg.
- the requirement is that a three-stage (or even more) telescopic leg is required to achieve a wider support range based on the existing vehicle width.
- the third-stage telescopic legs are based on the original two-stage telescopic legs, and the first-stage telescopic legs are added to meet the requirements of the length of the legs.
- Solution 1 Two (or more) separate hydraulic cylinders are used to reverse the hydraulic cylinders, generally two piston rods of the hydraulic cylinder Pointing in the opposite direction, the cylinders of the two hydraulic cylinders are detachably fixedly connected, and the piston rods of the two hydraulic cylinders are respectively connected to the pump chassis and the minimum primary leg, and the strokes are matched, in both pistons When moving to the end of the stroke, the desired extension length of the two-stage telescopic legs is reached.
- Option 2 Drive with a multi-stage hydraulic cylinder, three-stage telescopic legs
- the three-stage sleeve hydraulic cylinder is adopted, and the rodless cylinder cylinder of the three-stage sleeve hydraulic cylinder is fixed to the pump chassis, the piston rod is connected with the smallest one-stage leg, and the inside of the piston rod is subjected to multi-layer hollowing treatment.
- the piston rod is both the piston rod of the upper stage hydraulic cylinder and the cylinder barrel of the next stage hydraulic cylinder. Due to the special nature of the structure, the external tubing arrangement of the hydraulic cylinder must be carried out by means of an external reel. Both of the above solutions have certain drawbacks.
- the length of the stroke of the two hydraulic cylinders is used to satisfy the length of the extension of the leg when the leg is moving. Under the condition that the width of the pump is constant, the total length of the stroke of the hydraulic cylinder will have a certain length. Limiting, and thus limiting the extension length of the telescopic legs, can not meet the stability design requirements of the vehicle; Second, the two separate hydraulic cylinders need to be separately connected to the oil pipe, and the oil pipe of the hydraulic cylinder needs to be extended and retracted together with the legs.
- the tube is easy to wear during exercise, and the hydraulic pipeline is difficult to arrange;
- the limitation of the size of the cross-section space makes the arrangement of the multi-stage hydraulic cylinder very difficult.
- the reel is required to realize the arrangement of the oil pipe.
- the life of the reed spring of the reel is short and often needs to be replaced.
- the third is the multi-stage hydraulic pressure.
- the driving force of the cylinder is small, especially the driving force of the pushing leg is provided by the smallest one-stage hydraulic cylinder of the multi-stage hydraulic cylinder.
- a multi-stage telescopic mechanism includes a mounting member and a plurality of telescopic members that are sequentially sleeved, and the plurality of telescopic members include a sleeve that is sleeved on the mounting member.
- the multi-stage telescopic mechanism comprises three driving devices, three driving The device comprises a hydraulic cylinder and at least one chain transmission, wherein the three driving devices are respectively connected between the first-stage telescopic member and the mounting member, between the second-stage telescopic member and the first-stage telescopic member, and the third-stage telescopic member and the third Between the secondary telescopic members.
- the multistage telescopic mechanism according to the first aspect of the invention wherein the three driving means comprise two chain transmissions and one hydraulic cylinder.
- the multistage telescopic mechanism according to the first aspect of the invention wherein the first stage telescopic member and the mounting member are connected by one of the two chain transmission devices; the second stage telescopic member and the first stage telescopic member Between the other of the two chain transmissions; the third stage telescopic member and the second stage telescopic member are connected by a hydraulic cylinder.
- the multistage telescopic mechanism according to the first aspect of the invention wherein the three driving means comprise a chain transmission and two hydraulic cylinders.
- the two hydraulic cylinders include a first hydraulic cylinder and a second hydraulic cylinder
- the first hydraulic cylinder and the second hydraulic cylinder respectively drive the phase of the multistage telescopic mechanism
- the multistage telescopic mechanism according to the first aspect of the present invention, wherein the first stage telescopic member and the mounting member are connected by a chain transmission; the second stage telescopic member and the first stage telescopic member pass the first The hydraulic cylinders are connected; the third stage telescopic member and the second stage telescopic member are connected by a second hydraulic cylinder; and wherein the first hydraulic cylinder and the second hydraulic cylinder are oppositely mounted to each other.
- the multi-stage telescopic mechanism according to the first aspect of the present invention, wherein the rodless cavity of the first hydraulic cylinder is connected in parallel with the rodless cavity of the second hydraulic cylinder, and the rodless cavity of the first hydraulic cylinder and the hydraulic fluid source are directly Connected, a first sequence valve is disposed on a connecting line between the rodless cavity of the second hydraulic cylinder and the hydraulic fluid source; or, the rodless cavity of the first hydraulic cylinder is connected in series with the rodless cavity of the second hydraulic cylinder, first The rodless cavity of the hydraulic cylinder is in direct communication with the hydraulic fluid source, and the first sequence valve is disposed on the connecting line between the rodless cavity of the first hydraulic cylinder and the rodless cavity of the second hydraulic cylinder.
- the multistage telescopic mechanism according to the first aspect of the present invention, wherein the rod chamber of the first hydraulic cylinder is connected in parallel with the rod chamber of the second hydraulic cylinder, and the rod chamber of the second hydraulic cylinder is directly connected to the hydraulic fluid source Connected, a second sequence valve is disposed on a connecting line between the rod chamber of the first hydraulic cylinder and the hydraulic fluid source; or the rod chamber of the first hydraulic cylinder is connected in series with the rod chamber of the second hydraulic cylinder, second The rod chamber of the hydraulic cylinder is in direct communication with the hydraulic fluid source, and the second sequence valve is disposed on the connecting line between the rod chamber of the first hydraulic cylinder and the rod chamber of the second hydraulic cylinder.
- the multistage telescopic mechanism wherein the second stage telescopic member is coupled to the first hydraulic cylinder by a pin coupling device, wherein the pin coupling device comprises: a pair of telescopic member connecting portions, forming Inside the second stage telescopic member, and on both sides of a vertical axis plane passing through the longitudinal axis of the first hydraulic cylinder; a pair of hydraulic cylinder connecting portions formed on the cylinder of the first hydraulic cylinder and located on the vertical axis The two sides of the plane; wherein, the pair of telescopic member connecting portions are connected to the pair of hydraulic cylinder connecting portions through the connecting pin shaft; and a dismounting space for disassembling the connecting pin shaft is formed between the pair of hydraulic cylinder connecting portions, The width of the loading space is greater than or equal to the length of the connecting pin.
- the positioning device is placed between the connecting pins on both sides of the vertical axis plane And against the end of the connecting pin.
- the positioning device includes a pressure plate placed in the disassembly space and abutting against an end of the coupling pin, and fastening of the pressure plate to the first hydraulic cylinder Screw.
- the multistage telescopic mechanism according to the first aspect of the invention, wherein the chain transmission device comprises: a motor mounted outside the mounting member; a driving sprocket and a driven sprocket mounted inside the mounting member, the driving sprocket and The shaft of the motor is coupled; and a chain wound around the drive sprocket and the driven sprocket, a section of the chain being fixedly coupled to the first stage telescopic member.
- the multi-stage telescopic mechanism according to the first aspect of the present invention, wherein the cylinders of the first hydraulic cylinder and the second hydraulic cylinder are fixedly coupled to each other, and the cylinder is mounted inside the second-stage telescopic member, the first The piston rod of the hydraulic cylinder is coupled to the first stage telescopic member, and the piston rod of the second hydraulic cylinder is coupled to the third stage telescopic member. Further, according to the multistage telescopic mechanism of the first aspect of the invention, the cylinder of the first hydraulic cylinder is disposed side by side with the cylinder of the second hydraulic cylinder.
- an engineering apparatus comprising a multi-stage telescopic mechanism and a multi-stage telescopic mechanism according to the first aspect of the present invention, the multi-stage telescopic mechanism being mounted to the engineering equipment by the mounting member.
- the invention has the following technical effects:
- the multi-stage telescopic mechanism of the invention adopts a combination of a chain transmission device and a hydraulic cylinder to control the operation of each of the telescopic legs, and has a reasonable structural arrangement, does not require a complicated pipeline structure, and can be in a limited construction space.
- the telescopic legs are effectively driven inside.
- FIG. 1 is a top plan view showing the overall structure of a multi-stage telescopic mechanism according to an embodiment of the present invention
- FIG. 2 is a side cross-sectional view showing a multi-stage telescopic mechanism according to an embodiment of the present invention, wherein The various stages of the telescopic members of the multi-stage telescopic mechanism are in a retracted state
- FIG. 1 is a top plan view showing the overall structure of a multi-stage telescopic mechanism according to an embodiment of the present invention
- FIG. 2 is a side cross-sectional view showing a multi-stage telescopic mechanism according to an embodiment of the present invention, wherein The various stages of the telescopic members of the multi-stage telescopic mechanism are in a retracted state
- FIG. 1 is a top plan view showing the overall structure of a multi-stage telescopic mechanism according to an embodiment of the present invention
- FIG. 2 is a side cross-sectional view showing a multi-stage telescopic mechanism according
- FIG. 3 is a side elevational cross-sectional view of the multi-stage telescopic mechanism according to an embodiment of the present invention, showing the first stage of the multi-stage telescopic mechanism
- Figure 4 shows a side elevational cross-sectional view of the multi-stage telescoping mechanism, showing the first and second stage telescopic members of the multi-stage telescopic mechanism
- Figure 5 is a side elevational cross-sectional view of the multi-stage telescoping mechanism according to one embodiment of the present invention taken along line KK of Figure 1, showing the first stage, the second stage of the multi-stage telescopic mechanism a state in which the stage and third stage telescopic members are extended;
- FIG. 6 is a cross-sectional view along line MM in FIG.
- FIG. 1 shows a cross-sectional view along line PP of Figure 6;
- Figure 8 shows a schematic diagram of a hydraulic cylinder connection line of a multi-stage telescopic mechanism according to one embodiment of the present invention;
- Figure 9 shows another embodiment in accordance with the present invention.
- the multi-stage telescopic mechanism according to the present invention is mainly used for supporting engineering equipment (for example, concrete pump truck), and the multi-stage telescopic mechanism of the present invention mainly comprises a mounting member 1 and a plurality of telescopic members 2, 3, 4 which are sequentially sleeved, and a mounting member 1 connected to a chassis (not shown) of the engineering equipment, the plurality of telescopic members 2, 3, 4 including a first-stage telescopic member 2 sleeved to the mounting member 1, and a second sleeve sleeved to the first-stage telescopic member 2
- the stage telescopic element 3 is sleeved on the third stage telescopic element 4 of the second stage telescopic element 3.
- the first stage telescopic member 2, the second stage telescopic member 3 and the third stage telescopic member 4 are respectively driven by three driving means, and the three driving means may comprise at least one chain transmission and a hydraulic cylinder.
- the first stage telescopic member 2 and the mounting member 1 are connected by a chain transmission, and the first telescopic member 2 will be extended and retracted relative to the mounting member 1 by the chain transmission.
- the second stage telescopic element 3 and the first stage telescopic element 2 are connected by a first hydraulic cylinder 9, and the second stage telescopic element 3 will extend relative to the first telescopic element 2 with the operation of the first hydraulic cylinder 9.
- the telescopic member 3 performs an extension and retraction motion.
- the prior art mainly uses a multi-stage sleeve hydraulic cylinder or a plurality of single-stage hydraulic cylinders corresponding to the number of telescopic members to drive each stage.
- Telescopic members however, multi-stage sleeve hydraulic cylinders are expensive, require high precision, require additional hose reels, and have low operational stability and safety; and are controlled by multiple single-stage hydraulic cylinders.
- the connecting line of the hydraulic system is quite complicated, and the excessive connecting pipe not only affects the movement of the telescopic member, but also wears or even damages during the movement of the telescopic member.
- the present invention provides the above-described multi-stage telescopic mechanism which adopts a new telescopic member control method capable of effectively controlling the movement of a plurality of stages (especially three or more stages) of the telescopic members.
- the multi-stage telescopic mechanism of the present invention uses a chain transmission device and a corresponding number of hydraulic cylinders to control the movement of the three-stage telescopic member, compared with the prior art control scheme using a three-stage telescopic hydraulic cylinder and a reel. It avoids the dependence on sophisticated components (multi-stage sleeve hydraulic cylinders) and eliminates the need for a hose reel, which can effectively extend the service life of hydraulic connecting pipes and reduce maintenance costs.
- each stage of the telescopic member of the multi-stage telescopic mechanism of the present invention are independently controlled by a separate transmission mechanism or a hydraulic cylinder, and each stage of the telescopic member is compared with the multi-stage sleeve hydraulic cylinder.
- the drive can be independent of other level of telescopic components and is more independent.
- the above-described multi-stage telescopic mechanism of the present invention may include three or more stages of telescopic members.
- a specific embodiment of the present invention will be described by taking a three-stage telescopic mechanism as an example.
- a chain transmission mechanism is used to drive the first stage telescopic member 2, and the first hydraulic cylinder 9 and the second hydraulic cylinder 10 are used to respectively drive the second stage telescopic member 3 and the third stage.
- Telescopic member 4 Telescopic member 4.
- the chain transmission mechanism and the hydraulic cylinder group can be arbitrarily matched with the respective stages of the telescopic members.
- the second stage telescopic member 3 may be driven by a chain transmission mechanism
- the first stage telescopic member 2 and the third stage telescopic member 4 may be driven by the first hydraulic cylinder 9 and the second hydraulic cylinder 10; or, may be driven by a chain transmission mechanism
- the third stage telescopic member 4 drives the first stage telescopic member 2 and the second stage telescopic member 3 with the first hydraulic cylinder 9 and the second hydraulic cylinder 10.
- a chain transmission and two hydraulic cylinders are used to drive the three-stage telescopic mechanism, but it should be understood that in other embodiments, two may be employed in accordance with the principles of the present invention.
- Chain drive and a hydraulic cylinder For example, two chain drives and one hydraulic cylinder can be used to achieve expansion and contraction of the first, second and third stage telescopic members 2, 3, 4, in which case the hydraulic cylinders are connected in the second stage.
- a reasonable number of chain drives and hydraulic cylinder combinations can be used depending on the actual design.
- the structure of the above-mentioned three-stage telescopic mechanism can be adopted, and combined with other chain transmission devices and/or hydraulic cylinder combinations, for example, for the four-stage telescopic mechanism, the above-mentioned three-stage telescopic mechanism can be used to realize the expansion and contraction of the first three-stage telescopic members, and
- the fourth stage telescopic member is driven by an additional drive device (such as a chain drive or a hydraulic cylinder) to drive it to telescope.
- an additional drive device such as a chain drive or a hydraulic cylinder
- the first hydraulic cylinder 9 and the second hydraulic cylinder 10 are respectively used to drive two adjacent telescopic members, that is, the second-stage telescopic member 3 and the third-stage telescopic member 4 .
- first hydraulic cylinder 9 and the second hydraulic cylinder 10 are mounted opposite each other. This mounting method contributes to simplifying the connection piping and making the overall structure of the telescopic mechanism simple and reliable.
- first hydraulic cylinder 9 and the second hydraulic cylinder 10 can also be used to drive other adjacent telescopic members, for example, for driving the first stage telescopic member 2 and the second stage telescopic member 3, respectively.
- the multistage telescopic mechanism of the present invention further includes a vertical support hydraulic cylinder 15 disposed under the third stage telescopic member 4 for supporting the telescopic mechanism in a state in which the expansion mechanism is deployed.
- Fig. 1 there is shown an arrangement of a chain transmission applied in a multistage telescopic mechanism according to the present invention.
- the chain transmission includes: a motor 5 mounted on the outside of the mounting member 1, a motor 5 for driving the entire chain transmission; a drive sprocket 7 and a driven sprocket 6 mounted on the inside of the mounting member 1, a drive sprocket 7 and a motor
- the rotating shafts of 5 are connected so as to rotate synchronously with the rotation of the rotating shaft of the motor 5; and the chain 8 wound around the driving sprocket 7 and the driven sprocket 6, the chain 8 moves with the rotation of the driving sprocket 7 And a segment 8a of the chain 8 is fixedly coupled to the first stage telescopic member 2.
- a segment 8a of the chain 8 is fixedly coupled to the first stage telescopic member 2.
- a segment 8a of the chain 8 can be fixedly coupled to the outer wall of the first stage telescopic member 2 via a connecting pin and a connecting plate.
- the driving sprocket 7 is mounted on the mounting member 1 at a position close to the first telescopic member 2, and the driven sprocket 6 is mounted at a position away from the first telescopic member 2; the driving sprocket 7 and the driven sprocket 6 are mounted on the mounting member 1 On the side wall.
- the driving sprocket 7 is driven to rotate synchronously, so that the chain 8 is linearly moved forward, and since the segment 8a of the chain 8 is fixedly coupled with the first-stage telescopic member 2, the first-stage telescopic member 2 Immediately under the traction of the chain 8, linear motion is also performed forward, i.e., the first stage telescopic member 2 projects from the mounting member 1.
- the motor 5 rotates in the reverse direction, the direction of movement of the chain 8 is also reversed, that is, linearly moved backward.
- the first-stage telescopic member 2 is also moved backward by the chain 8, that is, the first stage.
- the telescopic member 2 is retracted into the mounting member 1.
- the chain transmission device of the present invention realizes the telescopic control of the first-stage telescopic member 2.
- the driving sprocket 7 and the driven sprocket 6 may also be mounted on the outer wall of the first-stage telescopic member 2, and a segment 8a of the chain 8 may be fixed to the inner wall of the mounting member 1. Connection, this arrangement also enables the above described transmission operation.
- the arrangement of the hydraulic cylinder groups in the multistage telescopic mechanism of the present invention will be described with reference to Figs. 2 to 5 . As best shown in Fig.
- the cylinder barrel 9b of the first hydraulic cylinder 9 is rigidly fixedly coupled with the cylinder barrel 10b of the second hydraulic cylinder 10, and the cylinder barrels 9b, 10b are all mounted on the second stage telescopic member.
- the inside of 3 The respective cylinders 9b, 10b of the first hydraulic cylinder 9 and the second hydraulic cylinder 10 are arranged substantially side by side to ensure the stroke of the hydraulic cylinder.
- the piston rod 9a of the first hydraulic cylinder 9 is coupled to the first stage telescopic member 2
- the piston rod 10a of the second hydraulic cylinder 10 is coupled to the third stage telescopic member 4.
- the piston rod 10a of the second hydraulic cylinder 10 is fixed to the third stage telescopic member 4 by the pin shaft 13, and the cylinder barrel 9b of the first hydraulic cylinder 9 is fixed to the first stage telescopic member 2 by the pin shaft 11. .
- the first stage telescopic member 2 is driven by the motor 5, the sprockets 6 and 7, and the chain 8, and the forward and reverse rotation of the motor 5 drives the first step member 2 Stretching back and forth in the mounting member 1.
- Action 2 As shown in Fig. 4, the second stage telescopic member 3 is driven by the first hydraulic cylinder 9.
- the piston rod 9a of the first hydraulic cylinder 9 has a hydraulic fluid port (not shown).
- the cylinder of the first hydraulic cylinder 9 When hydraulic fluid is injected into the rodless chamber of the first hydraulic cylinder 9 through the hydraulic fluid port, the cylinder of the first hydraulic cylinder 9 is hydraulically Extending forward under the action of the fluid, the second stage telescopic member 3 is pushed out of the first stage telescopic member 2; when the hydraulic fluid is injected into the rod cavity of the first hydraulic cylinder 9 through the hydraulic fluid port, the first hydraulic cylinder The cylinder of 9 is retracted by the action of the hydraulic fluid, and the second stage telescopic member 3 is pushed back into the first stage telescopic member 2. Thereby, the expansion and contraction movement of the second-stage telescopic member 3 can be realized by injecting hydraulic fluid into the rodless chamber or the rod chamber of the first hydraulic cylinder 9.
- the third stage telescopic member 4 is driven by the second hydraulic cylinder 10.
- the piston rod 10a of the second hydraulic cylinder 10 has a hydraulic fluid port (not shown).
- the piston rod 10a of the second hydraulic cylinder 10 is When the hydraulic fluid is extended forward, the third-stage telescopic member 4 is pushed out of the second-stage telescopic member 3; when the hydraulic fluid is injected into the rod-shaped cavity of the second hydraulic cylinder 10 through the hydraulic fluid port, the second hydraulic pressure
- the piston rod 10a of the cylinder 10 is retracted by the action of the hydraulic fluid, and the third stage telescopic member 4 is pushed back into the second stage telescopic member 3.
- the telescopic movement of the third stage telescopic member 4 can be realized.
- the expansion and contraction mechanism is required to be extended, the number and order of the telescopic members need to be extended according to the actual operation requirements and the space of the construction site.
- the first-stage telescopic member 2 protrudes from the mounting member 1 (ie, the action) a); or the first stage telescopic member 2 extends out of the mounting member 1, and the second stage telescopic member 3 extends out of the first stage telescopic member 2 (ie, action one and action two); or the first stage telescopic member 2 extends first The mounting member 1, and then the second-stage telescopic member 3 projects out of the first-stage telescopic member 2, and finally the third-stage telescopic member 4 projects out of the second-stage telescopic member 3 (ie, action one, action two, and action three).
- each stage of the telescopic member is included in the mounting member 1, as shown in FIG. Further, in addition to artificially controlling the extension order of the telescopic members of the respective stages, it is also possible to automatically control the extension order of the telescopic members of the respective stages by providing appropriate auxiliary control means in the hydraulic circuit. According to the needs of engineering operations and the need for system safety, when controlling the various types of telescopic members, it is generally necessary to let the stiffness expand.
- the member e.g., the first-stage telescopic member described above
- the less rigid telescopic member e.g., the second and third-stage telescopic members described above
- the multi-stage telescopic mechanism of the present invention is further improved on the basis of the above-described control device to realize the sequential operation of the telescopic mechanisms of each stage, which will be specifically described below.
- the two hydraulic cylinders preferably use a fluid supply line of a common hydraulic fluid source, in which case, in order to achieve a sequential extension of the telescopic mechanism (ie, control the sequence of actions of the hydraulic cylinder group) , the pipeline structure of the hydraulic cylinder needs to be improved.
- the pipeline structure of the hydraulic cylinder needs to be improved.
- the rodless cavity 9c of the first hydraulic cylinder 9 is connected in series with the rodless cavity 10c of the second hydraulic cylinder 10, and the rodless cavity 9c of the first hydraulic cylinder 9 is
- the hydraulic fluid source S is directly in communication, and a first sequence valve 14 is disposed on a connecting line between the rodless chamber 9c of the first hydraulic cylinder 9 and the rodless chamber 10c of the second hydraulic cylinder 10.
- the rodless cavity 9c of the first hydraulic cylinder 9 is connected in parallel with the rodless cavity 10c of the second hydraulic cylinder 10 to make the rodless cavity of the first hydraulic cylinder 9 9c is in direct communication with the hydraulic fluid source S, and a first sequence valve 14 is disposed on the connecting line between the rodless chamber 10c of the second hydraulic cylinder 10 and the hydraulic fluid source S (as shown in FIGS. 2 to 5).
- the sequential extension of the first hydraulic cylinder 9 and the second hydraulic cylinder 10 is achieved by the first sequence valve 14 described above.
- an additional sequence valve may be further configured to achieve sequential retraction of the respective piston rods of the first hydraulic cylinder 9 and the second hydraulic cylinder 10.
- the rod chamber 9d of the first hydraulic cylinder 9 is connected in series with the rod chamber 10d of the second hydraulic cylinder 10, and the rod chamber 9d of the second hydraulic cylinder 10 is hydraulically connected.
- the fluid source S is directly connected, first A second sequence valve 19 is disposed on the connecting line between the rod chamber 9d of the hydraulic cylinder 9 and the rod chamber 10d of the second hydraulic cylinder 10.
- the hydraulic fluid source injects hydraulic fluid into the rod-shaped chamber 10d of the second hydraulic cylinder 10, thereby pushing the piston rod 10a back, at which time the hydraulic fluid does not enter the first hydraulic pressure due to the action of the second sequence valve 19.
- the cylinder 9 has a rod chamber 9d; when the pressure in the rod chamber 10d of the second cylinder 10 reaches the opening threshold of the second sequence valve 19, the second sequence valve 19 is opened, at which time the hydraulic fluid enters the first hydraulic pressure.
- the cylinder 9 has a rod cavity 9d to urge the piston rod 9a to retract.
- the rod chamber 9d of the first hydraulic cylinder 9 is connected in parallel with the rod chamber 10d of the second hydraulic cylinder 10, and the rod chamber of the second hydraulic cylinder 10 is
- the hydraulic fluid source S is directly in communication, and a second sequence valve 19 is disposed on the connecting line between the rod chamber 9d of the first hydraulic cylinder 9 and the hydraulic fluid source S.
- the hydraulic fluid source supplies hydraulic fluid to the rod chambers 9d, 10d of the first hydraulic cylinder 9 and the second hydraulic cylinder 10, at which time the hydraulic fluid is directly Entering the rod chamber 10d of the second hydraulic cylinder 10, thereby pushing the piston rod 10a to retract, and due to the action of the second sequence valve 19, the fluid does not enter the rod chamber 9d of the first hydraulic cylinder 9 at this time; when the pressure in the system When the opening threshold of the second sequence valve 19 is reached, the second sequence valve 19 is opened, at which time the hydraulic fluid enters the rod chamber 9d of the first cylinder 9, thereby pushing the piston rod 9a back.
- the sequential retraction of the respective piston rods of the second hydraulic cylinder 10 and the first hydraulic cylinder 9 can be realized.
- the control device for realizing the sequential control should also be changed accordingly, and the transformation scheme also includes In the present invention.
- the multi-stage telescopic mechanism of the present invention also improves the connection between the telescopic member and the hydraulic cylinder to overcome the shortcomings of the prior art in which the hydraulic cylinder is difficult to be replaced, and to meet the needs of convenient disassembly and assembly. The details will be described below with reference to Figs. 6 and 7. As shown in FIGS.
- the second stage telescopic member 3 is fixed to the cylinder of the first hydraulic cylinder 9 by two easily removable inner connecting pin shafts 12. .
- the above-described internal pickup type pin 12 mounting method is specifically shown in Fig. 7.
- the second stage telescopic member 3 is connected to the cylinder barrel of the first hydraulic cylinder 9 on both sides in the radial direction by the connecting pin 12, wherein the second stage telescopic member 3 and the first hydraulic cylinder 9 respectively have a radial direction
- the telescopic member connecting portion 31 and the hydraulic cylinder connecting portion 91 on both sides of the longitudinal axis A are fixedly coupled together by the connecting pin shaft 12 to the telescopic member connecting portion 31 and the hydraulic cylinder connecting portion 91, thereby realizing the second-stage telescopic member 3 and the first A connection of a hydraulic cylinder 9.
- its telescopic member connecting portion 31 is generally formed at the root of the second-stage telescopic member 3, that is, the portion that is always accommodated in the first-stage telescopic member 2.
- the above-mentioned connecting portions 31, 91 are each formed with a pin hole for mounting the connecting pin 12, and between the pin holes of the hydraulic cylinder connecting portion 91
- the detachment space 18 for detaching the coupling pin 12 is formed, and the width L of the detaching space 18 is greater than or equal to the length D of the coupling pin 12.
- the dismounting space 18 is provided with a positioning device for fixing the connecting pin 12, specifically, the positioning device includes a pressing plate 16 placed on the inner surface of the dismounting space 18 and fixing the pressing plate 16 to the first hydraulic cylinder. 9 fastening screws 17. Due to the setting of the pressure plate 16, the connecting pin 12 cannot be taken out.
- the root portion of the second-stage telescopic member 3 (that is, the portion connected to the cylinder barrel of the first hydraulic cylinder 9) is always movable inside the first-stage telescopic member 2, when the hydraulic cylinder needs to be replaced At this time, the second stage telescopic member 3 needs to be taken out from the first stage telescopic member 2, and then the hydraulic cylinder can be removed.
- the telescopic mechanism of the present invention when the first hydraulic cylinder 9 is removed by the above-described connection method, the two fastening screws 17 are loosened, the pressure plate 16 is taken out, and the coupling pin 12 is moved into the detaching space 18.
- the coupling pin 12 When the coupling pin 12 is completely removed from the pin hole, the coupling pin 12 can be taken out from the detaching space 18, whereby the detachment of the first hydraulic cylinder 9 can be completed. In the above manner, the replacement of the first hydraulic cylinder 9 is made faster and easier.
- the above is an example of the connection between the second stage telescopic element 3 and the first hydraulic cylinder 9 as an example of the simple disassembly and assembly of the hydraulic cylinder. It should be noted that the above-described disassembly and assembly method can also be applied to the third stage telescopic member 4 and the The disassembly and assembly of the two hydraulic cylinders 10 is similar to that described above, and will not be described herein.
- the multi-stage telescopic mechanism of the present invention uses a chain transmission device and a hydraulic cylinder group to respectively drive the movement of the three-stage telescopic mechanism; further, by providing an additional hydraulic sequence control valve, the three-stage telescopic mechanism can also be realized. Sequential control; Again, by improving the connection between the hydraulic cylinder and the telescopic member, the hydraulic cylinder is easily disassembled.
- the present invention also provides an engineering apparatus of the above-described principle, the engineering apparatus comprising the above-described multi-stage telescopic mechanism according to the present invention, the multi-stage telescopic mechanism being mounted to the chassis of the engineering equipment for use in Support engineering equipment during the operation.
- the above engineering equipment may be a concrete pump truck, a crane or the like.
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Description
多级伸缩机构以及工程设备 技术领域 本发明涉及工程设备领域, 具体涉及工程设备的多级伸缩机构以及包括该多级伸 缩机构的工程设备。 背景技术 目前, 在很多作业运输设备中, 为了满足工程作业的需要, 需要为这些工程设备 配备伸缩支撑机构, 以便在工程作业过程中稳定地支撑设备。 以混凝土泵车为例, 混 凝土泵车经过多年发展, 泵车的臂架长度已经呈越来越长的发展趋势, 由于泵车臂架 长度的增加, 为保证泵车整车的稳定性, 需要扩大整车的稳定支撑区域面积, 所以也 就要相应地增加支腿的长度, 但由于泵车在整车车宽方面的限制, 使得以往经常采用 的二级伸缩支腿已经不能满足支腿长度的要求了, 需要采用三级 (甚至更多级) 伸缩 支腿来在现有车宽的基础上达到更宽广的支撑范围。 三级伸缩支腿即在原有二级伸缩 支腿的基础上, 再增加一级伸缩腿使其满足支腿长度的要求。 目前常用的多级伸缩支 腿的驱动方式主要有如下两种: 方案一: 采用两个 (或多个) 单独的液压缸, 将液压缸反向布置, 一般是使液压 缸的两个活塞杆指向相反的方向, 两个液压缸的缸筒可拆卸式地固定连接, 两个液压 缸的活塞杆分别与泵车底架和最小一级支腿相连, 通过行程的匹配, 在两个活塞都运 动到行程的尽头时, 达到两级伸缩腿期望的伸出长度, 伸缩腿的级数越多, 液压缸的 个数也越多; 方案二: 采用一个多级液压缸驱动, 三级伸缩腿采用三级套筒液压缸, 三级套筒 液压缸的无杆腔缸筒固定于泵车底架, 活塞杆与最小一级支腿相连, 并对活塞杆内部 进行多层掏空处理, 使活塞杆既是上一级液压缸活塞杆, 又能够成为下一级液压缸的 缸筒。 由于结构的特殊性, 必须采用外加卷管器的方式进行液压缸外油管布置。 上述两种方案都存在有一定的缺陷。 方案一主要存在如下两个缺陷: 一是要用两个液压缸的行程长度满足支腿运动时 伸出的距离长度,在泵车宽度一定的条件下,液压缸行程的总长会有一定的长度限制, 进而限制伸缩腿的伸出长度, 不能满足整车的稳定性设计要求; 二是两个单独液压缸 都单独需要连接油管, 而且液压缸的油管需要随支腿一起做伸出缩回的往复运动, 油
管在运动中易磨损, 液压管路布置困难; 方案二主要存在如下三个缺陷: 一是多级液 压缸的外径规格较大, 而且每一级液压缸的行程不一致, 由于多级支腿截面空间大小 的限制, 使得多级液压缸的布置非常困难; 二是需要采用卷管器实现油管的布置, 但 是卷管器的板簧弹片的寿命较短, 经常需要更换; 三是多级液压缸的驱动力较小, 特 别是推动支腿的驱动力是由多级液压缸中最小的一级液压缸所提供的, 当支腿出现异 常卡阻时, 将无法提供足够的驱动力推出支腿。 发明内容 本发明的目的在于提供一种新的多级伸缩机构以及包括该多级伸缩机构的工程设 备, 该多级伸缩机构采用改进的驱动方式, 克服了现有技术的控制装置中存在的缺点。 针对上述目的, 根据本发明的第一方面提供了一种多级伸缩机构, 该多级伸缩机 构包括安装构件和依次套接的多个伸缩构件, 多个伸缩构件包括套接于安装构件的第 一级伸缩构件、 套接于第一级伸缩构件的第二级伸缩构件和套接于第二级伸缩构件的 第三级伸缩构件, 其中, 多级伸缩机构包括三个驱动装置, 三个驱动装置包括液压缸 和至少一个链条传动装置,三个驱动装置分别连接在第一级伸缩构件与安装构件之间、 第二级伸缩构件与第一级伸缩构件之间以及第三级伸缩构件与第二级伸缩构件之间。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 三个驱动装置包括两 个链条传动装置和一个液压缸。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 第一级伸缩构件与安 装构件之间通过两个链条传动装置中的一个相连; 第二级伸缩构件与第一级伸缩构件 之间通过两个链条传动装置中的另一个相连; 第三级伸缩构件与第二级伸缩构件之间 通过液压缸相连。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 三个驱动装置包括一 个链条传动装置和两个液压缸。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 两个液压缸包括第一 液压缸和第二液压缸, 第一液压缸和第二液压缸分别驱动多级伸缩机构中相邻的两个 伸缩构件, 其中, 第一液压缸与第二液压缸彼此反向安装。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 第一级伸缩构件与安 装构件之间通过链条传动装置相连; 第二级伸缩构件与第一级伸缩构件之间通过第一
液压缸相连; 第三级伸缩构件与第二级伸缩构件之间通过第二液压缸相连; 并且其中, 第一液压缸与第二液压缸彼此反向安装。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 第一液压缸的无杆腔 与第二液压缸的无杆腔并联, 第一液压缸的无杆腔与液压流体源直接连通, 第二液压 缸的无杆腔与液压流体源之间的连接管路上设置有第一顺序阀; 或者, 第一液压缸的 无杆腔与第二液压缸的无杆腔串联, 第一液压缸的无杆腔与液压流体源直接连通, 第 一液压缸的无杆腔与第二液压缸的无杆腔之间的连接管路上设置有第一顺序阀。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 第一液压缸的有杆腔 与第二液压缸的有杆腔并联, 第二液压缸的有杆腔与液压流体源直接连通, 第一液压 缸的有杆腔与液压流体源之间的连接管路上设置有第二顺序阀; 或者, 第一液压缸的 有杆腔与第二液压缸的有杆腔串联, 第二液压缸的有杆腔与液压流体源直接连通, 第 一液压缸的有杆腔与第二液压缸的有杆腔之间的连接管路上设置有第二顺序阀。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 第二级伸缩构件通过 销轴连接装置与第一液压缸相连, 其中销轴连接装置包括: 一对伸缩构件连接部, 形 成在第二级伸缩构件内侧, 并位于经过第一液压缸的纵向轴线的竖直轴平面的两侧; 一对液压缸连接部, 形成在第一液压缸的缸筒上, 并位于竖直轴平面的两侧; 其中, 一对伸缩构件连接部通过连接销轴与一对液压缸连接部相连; 并且, 一对液压缸连接 部之间形成有用于拆装连接销轴的拆装空间, 拆装空间的宽度大于等于连接销轴的长 度。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 拆装空间处设置有用 于固定连接销轴位置的定位装置, 定位装置置于竖直轴平面两侧的连接销轴之间, 并 抵靠连接销轴的端部。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 定位装置包括放置在 拆装空间内并抵靠连接销轴的端部的压板以及将压板固定至第一液压缸的紧固螺钉。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 链条传动装置包括: 安装在安装构件外侧的马达; 安装在安装构件内侧的主动链轮和从动链轮, 主动链轮 与马达的转轴相连; 以及缠绕在主动链轮和从动链轮上的链条, 链条的一段与第一级 伸缩构件固定连接在一起。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 第一液压缸与第二液 压缸各自的缸筒彼此固定连接在一起, 并且缸筒安装在第二级伸缩构件的内侧, 第一
液压缸的活塞杆连接于第一级伸缩构件,第二液压缸的活塞杆连接于第三级伸缩构件。 进一步地, 根据本发明的第一方面的多级伸缩机构, 其中, 第一液压缸的缸筒与 第二液压缸的缸筒并排设置。 根据本发明的第二方面提供了一种工程设备, 其包括多级伸缩机构以及根据本发 明第一方面的多级伸缩机构, 上述多级伸缩机构通过安装构件安装至工程设备。 本发明具有以下技术效果: 本发明的多级伸缩机构采用链条传动装置和液压缸组合来控制各级伸缩支腿的操 作, 其结构布置合理, 无需复杂的管路结构, 可以在有限的结构空间内有效地驱动伸 缩支腿。 应该理解, 以上的一般性描述和以下的详细描述都是列举和说明性质的, 目的是 为了对要求保护的本发明提供进一步的说明。 附图说明 附图构成本说明书的一部分, 用于帮助进一步理解本发明。 这些附图图解了本发 明的一些实施例, 并与说明书一起用来说明本发明的原理。 在附图中相同的部件用相 同的标号表示。 附图中: 图 1示出了根据本发明一个实施例的多级伸缩机构的总体结构俯视示意图; 图 2示出了根据本发明一个实施例的多级伸缩机构的侧视剖视图, 其中示出了多 级伸缩机构的各级伸缩构件均处于收回状态; 图 3示出了根据本发明一个实施例的多级伸缩机构的又一侧视剖视图, 其中示出 了多级伸缩机构的第一级伸缩构件伸出的状态; 图 4示出了根据本发明一个实施例的多级伸缩机构的又一侧视剖视图, 其中示出 了多级伸缩机构的第一级、 第二级伸缩构件伸出的状态; 图 5示出了沿图 1中 K-K线剖切的根据本发明一个实施例的多级伸缩机构的又一 侧视剖视图, 其中示出了多级伸缩机构的第一级、 第二级、 第三级伸缩构件伸出的状 态; 图 6示出了图 2中沿线 M-M的剖视图;
图 7示出了沿图 6中线 P-P的剖视图; 图 8示出了根据本发明一个实施例的多级伸缩机构的液压缸连接线路的原理图; 图 9 示出了根据本发明另一个实施例的多级伸缩机构的液压缸连接线路的原理 图。 具体实施方式 下面将参照附图并结合具体实施例来说明本发明的实施方式。 首先, 参照图 1中所示的实施例对本发明的多级伸缩机构的基本构造原理进行说 明。根据本发明的多级伸缩机构主要用于支撑工程设备(例如混凝土泵车), 本发明的 多级伸缩机构主要包括安装构件 1和依次套接的多个伸缩构件 2、 3、 4, 安装构件 1 连接至工程设备的底架(未示出), 多个伸缩构件 2、 3、 4包括套接于安装构件 1的第 一级伸缩构件 2、套接于第一级伸缩构件 2的第二级伸缩构件 3、套接于第二级伸缩构 件 3的第三级伸缩构件 4。 第一级伸缩构件 2、 第二级伸缩构件 3和第三级伸缩构件 4 分别通过三个驱动装置驱动, 三个驱动装置可以包括至少一个链条传动装置以及液压 缸。在图 1的实施例中,第一级伸缩构件 2与安装构件 1之间通过链条传动装置相连, 第一伸缩构件 2将在链条传动装置的带动下相对于安装构件 1进行伸出和收回运动; 第二级伸缩构件 3与第一级伸缩构件 2之间通过第一液压缸 9相连, 第二级伸缩构件 3将随着第一液压缸 9的操作而相对于第一伸缩构件 2进行伸出和收回运动; 第三级 伸缩构件 4与第二级伸缩构件 3之间通过第二液压缸 10相连,第三级伸缩构件 4将随 着第二液压缸 10的操作而相对于第二级伸缩构件 3进行伸出和收回运动。 对于多级 (尤其是三级或更多级) 伸缩机构的控制, 现有技术中主要是采用多级 套筒液压缸或者是与伸缩构件数目相当的多个单级液压缸来驱动每一级伸缩构件, 但 是, 多级套筒液压缸价格昂贵、 精密度要求高、 需要辅以额外的卷管器、 且操作稳定 性和安全性较低; 而对于采用多个单级液压缸进行控制的情况下, 现有技术的布置方 式中液压系统的连接管路相当复杂, 过多的连接管路不仅会影响伸缩构件的运动, 而 且会在伸缩构件运动的过程受到磨损甚至损坏。 为了解决这些问题, 本发明提供了上 述的多级伸缩机构, 其采用了新的伸缩构件控制方式, 能够有效地控制多级 (尤其是 三级或更多级) 伸缩构件的运动。 具体地, 本发明的多级伸缩机构采用链条传动装置 和相应数目的液压缸来控制三级伸缩构件的运动, 与现有技术中采用三级伸缩液压缸 加卷管器的控制方案相比, 避免了对精密复杂部件 (多级套筒液压缸) 的依赖性, 并 且不需要采用卷管器, 可有效延长液压连接管的使用寿命, 降低维护保养成本。而且,
本发明的多级伸缩机构的每一级伸缩构件的伸出和缩回都采用单独的传动机构或是液 压缸来进行独立控制, 与多级套筒液压缸相比, 每一级伸缩构件的驱动可以不依赖于 其他级伸缩构件, 独立性更强。 上述本发明的多级伸缩机构可以包括三级甚至更多级的伸缩构件, 下面将以三级 伸缩机构为例来对本发明的具体实施方式进行说明。在图示的三级伸缩机构实施例中, 采用链条传动机构来驱动第一级伸缩构件 2, 使用第一液压缸 9和第二液压缸 10来分 别驱动第二级伸缩构件 3和第三级伸缩构件 4。 当然, 需要说明的是, 上述布置方式 并非限制性的, 根据本发明的原理, 链条传动机构和液压缸组可以与各级伸缩构件进 行任意的匹配。 例如, 可以用链条传动机构驱动第二级伸缩构件 3, 用第一液压缸 9 和第二液压缸 10驱动第一级伸缩构件 2和第三级伸缩构件 4; 或者, 可以用链条传动 机构驱动第三级伸缩构件 4, 用第一液压缸 9和第二液压缸 10驱动第一级伸缩构件 2 和第二级伸缩构件 3。 这些等同的替换实施方式都包含在本发明的范围之内。 同样地, 上述图 1的实施方式中,采用了一个链条传动装置和两个液压缸来驱动三级伸缩机构, 但是应理解, 根据本发明的原理, 在其他实施方式中, 也可以采用两个链条传动装置 和一个液压缸。例如, 可以用两个链条传动装置和一个液压缸来实现第一级、第二级、 第三级伸缩构件 2、 3、 4的伸缩, 在这种情况下, 液压缸连接在第二级伸缩构件 3和 第三级伸缩构件 4之间为优选方案。 此外, 对于更多级的伸缩结构, 可以根据实际结 构设计采用合理数目的链条传动装置和液压缸组合。 尤其可以采用上述三级伸缩机构 的结构, 并结合其他的链条传动装置和 /或液压缸组合, 例如, 对于四级伸缩机构, 可 以采用上述三级伸缩机构实现前三级伸缩构件的伸缩, 并通过另外的驱动装置 (例如 链条传动装置或液压缸) 驱动第四级伸缩构件来驱动其伸缩。 进一步地,在图中所示的实施方式中,第一液压缸 9与第二液压缸 10分别用于驱 动相邻的两个伸缩构件, 即第二级伸缩构件 3和第三级伸缩构件 4。 并且, 第一液压 缸 9与第二液压缸 10彼此反向安装,这种安装方式有助于简化连接管路, 使伸缩机构 的总体结构简洁可靠。除了图示的实施方式以外,第一液压缸 9与第二液压缸 10也可 以用于驱动其他相邻的伸缩构件, 例如分别用于驱动第一级伸缩构件 2和第二级伸缩 构件 3。 此外, 如图 2中所示的, 本发明的多级伸缩机构还包括垂直支承液压缸 15, 其布 置在第三级伸缩构件 4下方, 以用于在伸缩机构展开作业的状态下支撑伸缩机构, 同 时可以根据操作现场的地面状况对伸缩机构的高度进行适应性调整。 下面就参照附图来描述根据本发明的原理构造的三级伸缩机构的构造和操作方 式。
依然先参照图 1, 其中示出了根据本发明的多级伸缩机构中应用的链条传动装置 的布置方式。 该链条传动装置包括: 安装在安装构件 1外侧的马达 5, 马达 5用于驱 动整个链条传动装置; 安装在安装构件 1内侧的主动链轮 7和从动链轮 6, 主动链轮 7 与马达 5的转轴相连, 从而随着马达 5的转轴的旋转而同步作旋转运动; 以及缠绕在 主动链轮 7和从动链轮 6上的链条 8, 链条 8随着主动链轮 7的旋转而运动, 并且链 条 8的一段 8a与第一级伸缩构件 2固定连接在一起。具体地,在图 1所示的实施例中, 链条 8的一段 8a可以通过连接销轴、连接板与第一级伸缩构件 2的外壁固定连接。主 动链轮 7安装在安装构件 1上靠近第一伸缩构件 2的位置, 从动链轮 6安装在远离第 一伸缩构件 2的位置; 主动链轮 7和从动链轮 6安装在安装构件 1的侧壁上。 当马达 5的旋转轴旋转时, 驱动主动链轮 7同步旋转, 从而就会带动链条 8向前 直线运动, 由于链条 8的一段 8a与第一级伸缩构件 2固定连接, 因此第一级伸缩构件 2就在链条 8的牵引下, 也向前进行直线运动, 即第一级伸缩构件 2从安装构件 1中 伸出。 当马达 5反向旋转时, 链条 8的运动方向也相反, 即向后直线运动, 此时, 第 一级伸缩构件 2在链条 8的牵引下, 也作向后的直线运动, 即第一级伸缩构件 2收回 到安装构件 1中。 由此, 本发明的链条传动装置实现了对第一级伸缩构件 2的伸缩控 制。 需要说明的是, 在另外的实施方式中, 上述主动链轮 7和从动链轮 6也可以安装 在第一级伸缩构件 2的外壁上, 而链条 8的一段 8a可以与安装构件 1内壁固定连接, 这种布置方式同样能够实现上述传动操作。 下面, 参照图 2至图 5来说明本发明的多级伸缩机构中液压缸组的布置方式。 如 图 5中最佳地示出, 第一液压缸 9的缸筒 9b与第二液压缸 10的缸筒 10b刚性固定地 连接在一起, 并且缸筒 9b、 10b都安装在第二级伸缩构件 3的内侧。 第一液压缸 9与 第二液压缸 10各自的缸筒 9b、 10b基本并排设置, 以保证液压缸的行程。 同时, 第一 液压缸 9的活塞杆 9a连接于第一级伸缩构件 2, 第二液压缸 10的活塞杆 10a连接于 第三级伸缩构件 4。 具体地, 第二液压缸 10的活塞杆 10a通过销轴 13与第三级伸缩 构件 4固定在一起, 第一液压缸 9的缸筒 9b通过销轴 11与第一级伸缩构件 2固定在 一起。 通过上述安装, 在第一液压缸 9进行伸展动作时, 第一液压缸 9的活塞杆 9a从缸筒 9b中伸出, 从而推动缸筒 9b向前伸出, 由此带动第二级伸缩构件 3从第一级伸缩构件 2 中伸出; 在第二液压缸 10进行伸展动作时, 第二液压缸 10的活塞杆 10a从缸筒 10b中伸 出, 从而带动第三级伸缩构件 4从第二级伸缩构件 3中伸出。 类似地, 在两个液压缸 9、 10进行收回动作时, 将分别带动第二级伸缩构件 3和第三级伸缩构件 4收回。 由此即可通 过第一液压缸 9和第二液压缸 10分别驱动第二级伸缩构件 3和第三级伸缩构件 4运动。
图 2至图 5依次示出了整个三级伸缩机构中各个伸缩构件依次伸出的状态图, 其 中通过链条传动装置的运转,第一液压缸 9和第二液压缸 10的伸缩, 使各级伸缩构件 从上一级伸缩构件内伸出或收回, 从而实现对工程设备的支撑, 并符合设备行驶中对 空间的限制。 具体的控制动作步骤如下: 动作一: 如图 3所示, 通过马达 5、链轮 6和 7、链条 8来驱动第一级伸缩构件 2, 马达 5的正反转驱动第一级伸构件 2在安装构件 1中来回伸缩。 动作二: 如图 4所示, 通过第一液压缸 9驱动第二级伸缩构件 3。 第一液压缸 9 的活塞杆 9a上有液压流体口 (未示出), 当液压流体通过液压流体口注入第一液压缸 9的无杆腔中时, 第一液压缸 9的缸筒在液压流体的作用下往前伸, 就会推动第二级 伸缩构件 3伸出第一级伸缩构件 2; 当液压流体通过液压流体口注入第一液压缸 9的 有杆腔中时, 第一液压缸 9的缸筒在液压流体的作用下往后收, 就会推动第二级伸缩 构件 3收回到第一级伸缩构件 2中。 由此, 通过向第一液压缸 9的无杆腔或有杆腔中 注入液压流体, 即可以实现第二级伸缩构件 3的伸缩运动。 动作三: 如图 5所示, 通过第二液压缸 10驱动第三级伸缩构件 4。第二液压缸 10 的活塞杆 10a上有液压流体口(未示出), 当液压流体通过液压流体口注入第二液压缸 10的无杆腔中时, 第二液压缸 10的活塞杆 10a在液压流体的作用下往前伸, 就会推 动第三级伸缩构件 4伸出第二级伸缩构件 3 ; 当液压流体通过液压流体口注入第二液 压缸 10的有杆腔中时, 第二液压缸 10的活塞杆 10a在液压流体的作用下往后收, 就 会推动第三级伸缩构件 4收回到第二级伸缩构件 3 中。 由此, 通过向第二液压缸 10 的无杆腔或有杆腔中注入液压流体, 即可以实现第三级伸缩构件 4的伸缩运动。 当需要伸展开伸缩机构时, 根据实际操作需要, 以及施工场地的空间情况, 确定 需要伸出伸缩构件的级数和顺序,例如可以是:第一级伸缩构件 2伸出安装构件 1 (即 动作一); 或者第一级伸缩构件 2伸出安装构件 1, 且第二级伸缩构件 3伸出第一级伸 缩构件 2 (即动作一和动作二); 或者先第一级伸缩构件 2伸出安装构件 1, 然后第二 级伸缩构件 3伸出第一级伸缩构件 2, 最后第三级伸缩构件 4伸出第二级伸缩构件 3 (即动作一、 动作二和动作三)。 当设备处于行驶或非工作状态时, 每级伸缩构件都收入安装构件 1中, 如图 2所 示。 进一步地, 除了人为控制各级伸缩构件的伸出顺序以外, 还可以通过在液压回路 中设置适当的辅助控制装置, 来自动地控制各级伸缩构件的伸出顺序。 根据工程操作 中的需要和系统安全性的需要, 在控制各级伸缩构件时, 一般是先让刚度较大的伸缩
构件 (例如上述的第一级伸缩构件) 先伸出而后收回, 刚度较小的伸缩构件 (例如上 述的第二、 第三级伸缩构件) 后伸出先收回。 为此, 本发明的多级伸缩机构还在上述 控制装置的基础上进行了进一步的改进, 以实现各级伸缩机构的了顺序操作, 将具体 描述如下。 根据本发明, 为了简化管路, 两个液压缸优选地使用共同的液压流体源的流体供 应管路, 在此情况下, 为了实现伸缩机构的顺序伸出 (即控制液压缸组的动作顺序), 需要对液压缸的管路结构进行改进。 具体地, 在一个实施方式中, 如图 8所示, 将第一液压缸 9的无杆腔 9c与第二液 压缸 10的无杆腔 10c串联, 第一液压缸 9的无杆腔 9c与液压流体源 S直接连通, 第 一液压缸 9的无杆腔 9c与第二液压缸 10的无杆腔 10c之间的连接管路上设置第一顺 序阀 14。 在这种情况下, 当液压流体源向第一液压缸 9的无杆腔 9c中注入流体时, 流体先逐渐充满无杆腔并推动活塞杆 9a伸出, 此时由于第一顺序阀 14的作用, 流体 不会进入第二液压缸 10的无杆腔 10c; 当第一液压缸 9的无杆腔 10c内的压力达到第 一顺序阀 14的开启临界值时, 第一顺序阀 14打开, 液压流体此时才进入第二液压缸 10的无杆腔 10c, 从而推动活塞杆 10a伸出。 这种方式同样也可以实现第一液压缸 9 和第二液压缸 10各自的活塞杆顺序伸出。 替换地, 在另一实施例中, 如图 9所示, 将第一液压缸 9的无杆腔 9c与第二液压 缸 10的无杆腔 10c并联, 使第一液压缸 9的无杆腔 9c与液压流体源 S直接连通, 并 在第二液压缸 10的无杆腔 10c与液压流体源 S之间的连接管路上设置有第一顺序阀 14 (如图 2至图 5中所示), 通过上述第一顺序阀 14来实现第一液压缸 9和第二液压 缸 10的顺序伸出。 在这种布置中, 当液压流体源向第一液压缸 9和第二液压缸 10的 无杆腔 9c、 10c输入液压流体时, 液压流体首先直接进入第一液压缸 9的无杆腔 9c, 从而推动活塞杆 9c运动。 然而, 由于第一顺序阀 14的作用, 液压流体不会直接流入 第二液压缸 10的无杆腔 10c, 只有当系统中的液体压力达到第一顺序阀 14的开启临 界值时, 第一顺序阀 14开启, 液压流体才进入第二液压缸 10的无杆腔 10c, 进而推 动活塞杆 10a运动。 由此, 即可实现第一液压缸 9和第二液压缸 10各自的活塞杆顺序 伸出。 进一步地, 在此基础上, 可以进一步配置另外的顺序阀, 以实现第一液压缸 9和 第二液压缸 10各自的活塞杆的顺序收回。 具体地, 在一个实施方式中, 如图 8所示, 第一液压缸 9的有杆腔 9d与第二液压 缸 10的有杆腔 10d串联,第二液压缸 10的有杆腔 9d与液压流体源 S直接连通,第一
液压缸 9的有杆腔 9d与第二液压缸 10的有杆腔 10d之间的连接管路上设置第二顺序 阀 19。 在这种布置中, 液压流体源向第二液压缸 10的有杆腔 10d注入液压流体, 从 而推动活塞杆 10a收回, 此时由于第二顺序阀 19的作用, 液压流体不会进入第一液压 缸 9的有杆腔 9d; 当第二液压缸 10的有杆腔 10d内的压力达到第二顺序阀 19的开启 临界值时, 第二顺序阀 19打开, 此时液压流体才进入第一液压缸 9的有杆腔 9d, 从 而推动活塞杆 9a收回。 由此, 通过这种方式也可以实现第二液压缸 10和第一液压缸 9各自的活塞杆的顺序收回。 可替换地, 在另一实施方式中, 如图 9所示, 第一液压缸 9的有杆腔 9d与第二液 压缸 10的有杆腔 10d并联, 第二液压缸 10的有杆腔与液压流体源 S直接连通, 第一 液压缸 9的有杆腔 9d与液压流体源 S之间的连接管路上设置有第二顺序阀 19。 在这 种布置中, 当系统回流以使液压缸的活塞杆收回时, 液压流体源向第一液压缸 9和第 二液压缸 10的有杆腔 9d、 10d输送液压流体, 此时液压流体直接进入第二液压缸 10 的有杆腔 10d, 从而推动活塞杆 10a收回, 而由于第二顺序阀 19的作用, 流体此时不 进入第一液压缸 9的有杆腔 9d; 当系统内的压力达到第二顺序阀 19的开启临界值时, 第二顺序阀 19开启, 此时液压流体才进入第一液压缸 9的有杆腔 9d, 进而推动活塞 杆 9a收回。 由此, 即可实现第二液压缸 10和第一液压缸 9各自的活塞杆的顺序收回。 可以理解地, 当链条传动装置、 第一液压缸 9、 第二液压缸 10连接不同的伸缩构 件和 /或安装构件 1时, 实现顺序控制的控制装置也应作相应改变, 此变换方案同样包 含在本发明中。 更进一步地, 本发明的多级伸缩机构还对伸缩构件与液压缸之间的连接方式进行 了改进, 以克服现有技术中液压缸拆换困难的缺点, 满足方便拆装的需要。 下面将参 照图 6、 图 7具体描述。 如图 6、 7所示, 在本发明的多级伸缩机构中, 第二级伸缩构件 3通过两个易拆换 的内取式连接销轴 12与第一液压缸 9的缸筒固定在一起。 上述内取式连接销轴 12安 装方式在图 7中具体示出。第二级伸缩构件 3沿径向方向在两侧通过连接销轴 12与第 一液压缸 9的缸筒相连, 其中, 第二级伸缩构件 3与第一液压缸 9分别具有沿径向方 向位于纵向轴线 A两侧的伸缩构件连接部 31和液压缸连接部 91, 通过连接销轴 12 将伸缩构件连接部 31和液压缸连接部 91固定连接在一起, 从而实现第二级伸缩构件 3与第一液压缸 9的连接。 对于第二级伸缩构件 3而言, 其伸缩构件连接部 31—般形 成在第二级伸缩构件 3的根部处, 即始终容纳在第一级伸缩构件 2中的部分。 上述连 接部 31、 91均形成有用于安装连接销轴 12的销轴孔, 液压缸连接部 91的销轴孔之间
形成有用于拆装连接销轴 12的拆装空间 18,且该拆装空间 18的宽度 L大于等于连接 销轴 12的长度 D。 进一步地, 拆装空间 18处设置有用于固定连接销轴 12的定位装置, 具体地, 该 定位装置包括放置在拆装空间 18的内表面上的压板 16以及将压板 16固定至第一液压 缸 9的紧固螺钉 17。 由于压板 16的设置, 连接销轴 12无法脱出。 通过上面的布置, 在连接第二级伸缩构件 3与第一液压缸 9时, 将伸缩构件连接 部 31中的销轴孔与液压缸连接部 91中的销轴孔对准,从拆装空间 18处放入连接销轴 12, 进而将连接销轴 12推入销轴孔中, 依次装入各个销轴, 由此完成第二伸缩构件 3 与第一液压缸 9的连接。在现有技术的伸缩构件中, 由于第二级伸缩构件 3的根部(即 与第一液压缸 9的缸筒连接的部分) 一直在第一级伸缩构件 2内部活动, 因此当需要 更换液压缸时, 需要先把第二级伸缩构件 3从第一级伸缩构件 2中取出, 进而才能拆 下液压缸。 而根据本发明的伸缩机构中, 通过上述的连接方式, 在拆换第一液压缸 9 时, 松开两颗紧固螺钉 17, 取出压板 16, 将连接销轴 12往拆装空间 18中移动, 当连 接销轴 12完全从销轴孔中移出, 就可以从拆装空间 18中把连接销轴 12取出, 由此, 即可以完成第一液压缸 9的拆卸。 通过上述的方式, 使第一液压缸 9的更换变得更快 捷, 更容易。 上面是以第二级伸缩构件 3与第一液压缸 9的连接为例来说明液压缸的简易拆装 方式, 需要说明的是, 上述拆装方式同样可以应用于第三级伸缩构件 4与第二液压缸 10的拆装, 其布置方式与上述的类似, 在此就不再赘述了。 上面描述了根据本发明的多级伸缩机构的多个实施例, 其用于说明本发明的多种 具体实施方式。 由上面的描述可知, 本发明的多级伸缩机构采用链条传动装置与液压 缸组来分别驱动三级伸缩机构的运动; 进而, 通过设置附加的液压顺序控制阀, 还可 以实现三级伸缩机构的顺序控制; 再次,通过改进液压缸与伸缩构件之间的连接方式, 实现了液压缸的简易拆装。 除此之外, 本发明还提供了一种技术上述原理的工程设备, 该工程设备包括上述 根据本发明的多级伸缩机构, 多级伸缩机构安装至工程设备的底架处, 以用于在作业 过程中对工程设备进行支撑。 上述工程设备可以是混凝土泵车、 起重机等。 以上仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技术人 员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内所作的任何修 改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。
Claims
1. 一种多级伸缩机构, 其特征在于, 所述多级伸缩机构包括安装构件(1 )和依次 套接的多个伸缩构件 (2、 3、 4), 所述多个伸缩构件包括套接于所述安装构件
( 1 ) 的第一级伸缩构件 (2)、 套接于所述第一级伸缩构件 (2) 的第二级伸缩 构件 (3 ) 和套接于所述第二级伸缩构件 (3 ) 的第三级伸缩构件 (4), 其中, 所述多级伸缩机构包括三个驱动装置, 所述三个驱动装置包括液压缸和至少一 个链条传动装置, 所述三个驱动装置分别连接在所述第一级伸缩构件与所述安 装构件(1 )之间、 所述第二级伸缩构件(3 )与所述第一级伸缩构件(2)之间 以及所述第三级伸缩构件 (4) 与所述第二级伸缩构件 (3 ) 之间。
2. 根据权利要求 1所述的多级伸缩机构, 其特征在于, 所述三个驱动装置包括两 个链条传动装置和一个液压缸。
3. 根据权利要求 2所述的多级伸缩机构, 其特征在于, 所述第一级伸缩构件 (2) 与所述安装构件(1 )之间通过两个链条传动装置中的一个相连; 所述第二级伸 缩构件 (3 ) 与所述第一级伸缩构件 (2) 之间通过两个链条传动装置中的另一 个相连; 所述第三级伸缩构件 (4) 与所述第二级伸缩构件 (3 ) 之间通过所述 液压缸相连。
4. 根据权利要求 1所述的多级伸缩机构, 其特征在于, 所述三个驱动装置包括一 个链条传动装置和两个液压缸。
5. 根据权利要求 4所述的多级伸缩机构, 其特征在于, 所述两个液压缸包括第一 液压缸(9)和第二液压缸(10), 所述第一液压缸(9)和第二液压缸(10)分 别驱动所述多级伸缩机构中相邻的两个伸缩构件 (2、 3、 4), 其中, 所述第一 液压缸 (9) 与所述第二液压缸 (10) 彼此反向安装。
6. 根据权利要求 4所述的多级伸缩机构, 其特征在于,
所述第一级伸缩构件 (2) 与所述安装构件 (1 ) 之间通过链条传动装置相 连;
所述第二级伸缩构件 (3 ) 与所述第一级伸缩构件 (2) 之间通过第一液压 缸 (9) 相连; 所述第三级伸缩构件 (4) 与所述第二级伸缩构件 (3 ) 之间通过第二液压 缸 (10) 相连; 并且其中,
所述第一液压缸 (9) 与所述第二液压缸 (10) 彼此反向安装。
7. 根据权利要求 5或 6所述的多级伸缩机构, 其特征在于,
所述第一液压缸(9) 的无杆腔与所述第二液压缸(10) 的无杆腔并联, 所 述第一液压缸(9) 的无杆腔与液压流体源直接连通, 所述第二液压缸(10) 的 无杆腔与液压流体源之间的连接管路上设置有第一顺序阀 (14); 或者
所述第一液压缸(9) 的无杆腔与所述第二液压缸(10) 的无杆腔串联, 所 述第一液压缸 (9) 的无杆腔与液压流体源直接连通, 所述第一液压缸 (9) 的 无杆腔与所述第二液压缸 (10) 的无杆腔之间的连接管路上设置有第一顺序阀 ( 14)。
8. 根据权利要求 7所述的多级伸缩机构, 其特征在于,
所述第一液压缸(9) 的有杆腔与所述第二液压缸(10) 的有杆腔并联, 所 述第二液压缸(10) 的有杆腔与液压流体源直接连通, 所述第一液压缸(9) 的 有杆腔与液压流体源之间的连接管路上设置有第二顺序阀; 或者
所述第一液压缸(9) 的有杆腔与所述第二液压缸(10) 的有杆腔串联, 所 述第二液压缸(10) 的有杆腔与液压流体源直接连通, 所述第一液压缸(9) 的 有杆腔与所述第二液压缸(10)的有杆腔之间的连接管路上设置有第二顺序阀。
9. 根据权利要求 5或 6所述的多级伸缩机构, 其特征在于, 所述第二级伸缩构件
(3 )通过销轴连接装置与第一液压缸(9)相连, 其中所述销轴连接装置包括: 一对伸缩构件连接部 (31 ), 形成在所述第二级伸缩构件 (3 ) 内侧, 并位 于经过所述第一液压缸 (9) 的纵向轴线 (A) 的竖直轴平面的两侧;
一对液压缸连接部 (91 ), 形成在所述第一液压缸 (9) 的缸筒 (9b) 上, 并位于所述竖直轴平面的两侧;
其中, 所述一对伸缩构件连接部 (31 ) 通过连接销轴 (12) 与所述一对液 压缸连接部 (91 ) 相连; 并且, 所述一对液压缸连接部 (91 ) 之间形成有用于 拆装连接销轴 (12) 的拆装空间 (18), 所述拆装空间 (18) 的宽度 (L) 大于 等于所述连接销轴 (12) 的长度 (D)。
10. 根据权利要求 9所述的多级伸缩机构, 其特征在于,
所述拆装空间 (18 ) 处设置有用于固定所述连接销轴 (12) 位置的定位装 置, 所述定位装置置于所述竖直轴平面两侧的所述连接销轴 (12) 之间, 并抵 靠所述连接销轴 (12) 的端部。
11. 根据权利要求 10所述的多级伸缩机构, 其特征在于,
所述定位装置包括放置在所述拆装空间(18 )内并抵靠所述连接销轴(12) 的端部的压板(16) 以及将所述压板(16) 固定至所述第一液压缸(9) 的紧固 螺钉 (17)。
12. 根据权利要求 11所述的多级伸缩机构, 其特征在于, 所述链条传动装置包括: 安装在所述安装构件 (1 ) 外侧的马达 (5 );
安装在所述安装构件 (1 ) 内侧的主动链轮 (7) 和从动链轮 (6), 所述主 动链轮 (7) 与所述马达 (5 ) 的转轴相连; 以及
缠绕在所述主动链轮 (7) 和所述从动链轮 (6) 上的链条 (8), 所述链条 ( 8 ) 的一段 (8a) 与所述第一级伸缩构件 (2) 固定连接在一起。
13. 根据权利要求 5或 6所述的多级伸缩机构, 其特征在于,
所述第一液压缸 (9) 与所述第二液压缸 (10) 各自的缸筒 (9b、 10b) 彼 此固定连接在一起, 并且所述缸筒(9b、 10b )安装在所述第二级伸缩构件(3 ) 的内侧, 所述第一液压缸(9)的活塞杆(9a)连接于所述第一级伸缩构件(2), 所述第二液压缸 (10) 的活塞杆 (10a) 连接于所述第三级伸缩构件 (4)。
14. 根据权利要求 13所述的多级伸缩机构, 其特征在于,
所述第一液压缸(9) 的缸筒(9b) 与所述第二液压缸(10) 的缸筒(10b) 并排设置。
15. 一种工程设备,其特征在于,所述工程设备根据权利要求 1至 14中任一项所述 的多级伸缩机构, 所述多级伸缩机构通过所述安装构件(1 )安装至所述工程设 备。
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| CN102094870B (zh) * | 2011-01-13 | 2013-03-20 | 中联重科股份有限公司 | 多级伸缩机构以及工程设备 |
| CN102913266B (zh) * | 2011-08-05 | 2015-09-23 | 卡特彼勒(郑州)有限公司 | 用于矸石充填液压支架的双级伸缩捣实机构 |
| CN102501164B (zh) * | 2011-09-29 | 2014-06-11 | 中国航空工业第六一八研究所 | 伸缩式多级千分尺研具及其研修方法 |
| CN102352875B (zh) * | 2011-11-07 | 2014-05-07 | 山西森尔科技有限公司 | 一种用于液压伸缩臂的刚性伸缩油管 |
| CN103010180B (zh) * | 2012-12-19 | 2015-07-15 | 徐州徐工施维英机械有限公司 | 伸缩式支腿装置及臂架类工程机械设备 |
| CN105444710B (zh) * | 2014-08-21 | 2018-05-25 | 中联重科股份有限公司 | 多级伸缩结构行程测量装置和多级伸缩结构 |
| CN104477795A (zh) * | 2015-01-13 | 2015-04-01 | 中船华南船舶机械有限公司 | 多级油缸伸缩装置及其在伸缩式起重机上的安装方法 |
| CN104695540A (zh) * | 2015-02-12 | 2015-06-10 | 山东全欧环境产业有限公司 | 一种连动式多箱伸缩装置 |
| CN104712054A (zh) * | 2015-02-12 | 2015-06-17 | 山东全欧环境产业有限公司 | 一种多箱伸缩式井下清掏器 |
| CN107044285B (zh) * | 2017-01-09 | 2020-06-26 | 中国铁建重工集团股份有限公司 | 一种伸缩回转机构及水平旋喷钻机 |
| US20180273352A1 (en) * | 2017-03-22 | 2018-09-27 | Wetherell Mfg Co. | Sequential piggyback cylinders for extendable boom crane |
| CN110153085B (zh) * | 2019-06-27 | 2023-12-22 | 因而克智能科技(浙江)有限公司 | 一种自动化智能清洗装置 |
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| CN114131650A (zh) * | 2021-11-09 | 2022-03-04 | 杭州景业智能科技股份有限公司 | 伸缩装置 |
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