CN111442006A - Multi-cylinder sequential telescopic hydraulic system of folding arm type lorry-mounted crane - Google Patents

Multi-cylinder sequential telescopic hydraulic system of folding arm type lorry-mounted crane Download PDF

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Publication number
CN111442006A
CN111442006A CN202010407716.9A CN202010407716A CN111442006A CN 111442006 A CN111442006 A CN 111442006A CN 202010407716 A CN202010407716 A CN 202010407716A CN 111442006 A CN111442006 A CN 111442006A
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CN
China
Prior art keywords
oil port
hydraulic cylinder
communicated
cylinder
piston rod
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Pending
Application number
CN202010407716.9A
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Chinese (zh)
Inventor
翟富刚
张永超
张晋
于少萌
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Jiangsu Hongchang Tianma Logistics Equipment Co ltd
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Jiangsu Hongchang Tianma Logistics Equipment Co ltd
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Application filed by Jiangsu Hongchang Tianma Logistics Equipment Co ltd filed Critical Jiangsu Hongchang Tianma Logistics Equipment Co ltd
Priority to CN202010407716.9A priority Critical patent/CN111442006A/en
Publication of CN111442006A publication Critical patent/CN111442006A/en
Pending legal-status Critical Current

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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
    • F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
    • 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
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/07—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors in distinct sequence
    • 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • 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

Abstract

A multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane. Relates to the field of engineering structure, in particular to a multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane. Provides a multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane, which has compact structure and stable hydraulic system. The hydraulic control system comprises a first hydraulic cylinder, a first central pipe, a first-stage two-position two-way reversing valve, a first one-way valve, a second hydraulic cylinder and a three-position four-way reversing valve; one end of the first central pipe is fixedly connected with the bottom of the cylinder body of the first hydraulic cylinder, and the other end of the first central pipe extends into a first central hole of a first piston rod of the first hydraulic cylinder and is in sliding sealing connection with the first piston rod; the first central pipe and the first central pipe are respectively hollow pipe bodies with one closed ends. The hydraulic system has the characteristics of compact structure, stability and the like.

Description

Multi-cylinder sequential telescopic hydraulic system of folding arm type lorry-mounted crane
Technical Field
The invention relates to the field of engineering, in particular to a multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane.
Background
At present, the boom extension and retraction modes of a folding-arm type lorry-mounted crane are mostly synchronous extension and retraction, but with the gradual upsizing development of the lorry-mounted crane, the number of boom sections is more and more, the synchronous extension and retraction is not the best extension and retraction mode, and with the development of markets and technologies, the sequential extension and retraction mode gradually becomes the mainstream extension and retraction mode of the multi-boom folding-arm type lorry-mounted crane.
Disclosure of Invention
Aiming at the problems, the invention provides a multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane, which has a compact structure and a stable hydraulic system.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the hydraulic control system comprises a first hydraulic cylinder, a first central pipe, a first-stage two-position two-way reversing valve, a first one-way valve, a second hydraulic cylinder and a three-position four-way reversing valve;
one end of the first central pipe is fixedly connected with the bottom of the cylinder body of the first hydraulic cylinder, and the other end of the first central pipe extends into a first central hole of a first piston rod of the first hydraulic cylinder and is in sliding sealing connection with the first piston rod;
the bottom of the cylinder body at one side of the rodless cavity of the first hydraulic cylinder is provided with an A1 oil port and a B1 oil port which are respectively communicated with the three-position four-way reversing valve;
the inlet end of the first check valve is communicated with the A1 oil port, and the outlet end of the first check valve is communicated with the rodless cavity of the first hydraulic cylinder; the first-stage two-position two-way reversing valve is connected to two ends of the first one-way valve;
one end of the B1 oil port is communicated with the C1 oil port in the first center tube, and the other end of the B1 oil port is communicated with the three-position four-way electromagnetic directional valve;
the first piston rod is provided with a D1 oil port and an E1 oil port;
the D1 oil port is matched with the C1 oil port; the D1 oil port is communicated with an A2 oil port at the bottom of the cylinder body of the second hydraulic cylinder through a pipeline;
the E1 oil port is communicated with an H2 oil port on an end cover of the second hydraulic cylinder through a first piston rod inner oil way; after the first piston rod is completely extended, the E1 oil port is communicated with an F1 oil port on an end cover of the first hydraulic cylinder; the F1 oil port is communicated with the three-position four-way reversing valve through an H1 oil port on an end cover of the first hydraulic cylinder; the H1 oil port is communicated with the rod cavity of the first hydraulic cylinder.
The hydraulic cylinder also comprises a third hydraulic cylinder;
the second hydraulic cylinder is provided with a two-stage two-position two-way reversing valve, a second one-way valve and a second central pipe;
the inlet end of the second check valve is communicated with the A2 oil port, and the other end of the second check valve is communicated with the rodless cavity of the second hydraulic cylinder;
the second-stage two-position two-way reversing valve is communicated with two ends of the second one-way valve;
one end of the second central pipe is fixedly connected with the bottom of the cylinder body of the second hydraulic cylinder, and the other end of the second central pipe extends into a second central hole of a second piston rod of the second hydraulic cylinder and is in sliding sealing connection with the second piston rod;
a C2 oil port is formed in the second central pipe, and the C2 oil port is communicated with the D1 oil port through a B2 oil port in the bottom of the cylinder body of the second hydraulic cylinder;
the second piston rod is provided with a D2 oil port and an E2 oil port;
the D2 oil port is matched with the C2 oil port; the D2 oil port is communicated with an A3 oil port at the bottom of the cylinder body of the third hydraulic cylinder through a pipeline;
the E2 oil port is communicated with the B3 oil port on the end cover of the third hydraulic cylinder through a second piston rod internal oil way; after the second piston rod is completely extended, the E2 oil port is communicated with an F2 oil port on an end cover of the second hydraulic cylinder; the F2 oil port is communicated with the E1 oil port through an H2 oil port on an end cover of the second hydraulic cylinder; the H2 oil port is communicated with the rod cavity of the second hydraulic cylinder.
The three-position four-way reversing valve is of the type
The type of the first-stage two-position two-way reversing valve is
The first one-way valve is of the type
The first central pipe and the first central pipe are respectively hollow pipe bodies with one closed ends.
Due to the adoption of the technical scheme, the technical progress obtained by the scheme is as follows: the improvement of pneumatic cylinder structure is passed through to the present case, and when the davit stretches out, the order that realizes first, second, third pneumatic cylinder carries out the order and stretches out, and during the withdrawal, the order that realizes third, second, first pneumatic cylinder carries out the order and retracts, and control system is stable. The extension and retraction are controlled by strokes, and the system has low pressure and low energy loss because of no pressure control. The hydraulic system has the characteristics of compact structure, stability and the like.
Drawings
Figure 1 is a schematic diagram of the hydraulic principle of the invention,
figure 2 is a schematic view of the hydraulic principle in the extension action,
FIG. 3 is a schematic diagram of the hydraulic principle of the present retracting action;
in the figure, 1 is a first hydraulic cylinder, 2 is a second hydraulic cylinder, 3 is a third hydraulic cylinder, 4 is a one-stage two-position two-way reversing valve, 5 is a two-stage two-position two-way reversing valve, 6 is a first check valve, 7 is a second check valve, 8 is a first piston rod, 9 is a second piston rod, 10 is a third piston rod, 11 is a first central pipe, 12 is a second central pipe, and 13 is a three-position four-way reversing valve.
Detailed Description
The invention will be described in further detail with reference to the following description of the drawings:
as shown in fig. 1-3, 1, a multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane is characterized in that: the hydraulic control system comprises a first hydraulic cylinder 1, a first central pipe 11, a primary two-position two-way reversing valve 4, a first one-way valve 6, a second hydraulic cylinder 2 and a three-position four-way reversing valve 13;
one end of the first central pipe 11 is fixedly connected with the bottom of the cylinder body of the first hydraulic cylinder 1, and the other end of the first central pipe extends into a first central hole of a first piston rod 8 of the first hydraulic cylinder 1 and is connected with the first piston rod 8 in a sliding and sealing manner;
the bottom of the cylinder body at one side of the rodless cavity of the first hydraulic cylinder 1 is provided with an A1 oil port and a B1 oil port which are respectively communicated with the three-position four-way reversing valve 13;
the inlet end of the first check valve 6 is communicated with the A1 oil port, and the outlet end of the first check valve is communicated with the rodless cavity of the first hydraulic cylinder 1; the primary two-position two-way reversing valve 4 is connected to two ends of the first one-way valve 6;
one end of the oil port B1 is communicated with the oil port C1 in the first central tube 11, and the other end of the oil port B1 is communicated with the three-position four-way electromagnetic directional valve 13;
the first piston rod 8 is provided with a D1 oil port and an E1 oil port;
the D1 oil port is matched with the C1 oil port; after the first piston rod 8 is completely extended out, the C1 oil port on the first piston rod 8 is communicated with the D1 oil port; the D1 oil port is communicated with an A2 oil port at the bottom of the cylinder body of the second hydraulic cylinder through a pipeline; an A2 oil port is communicated with a rodless cavity of the first hydraulic cylinder 1;
the E1 oil port is communicated with an H2 oil port on the end cover of the second hydraulic cylinder through an oil way in the first piston rod 8; after the first piston rod 8 is completely extended, the E1 oil port is communicated with an F1 oil port on an end cover of the first hydraulic cylinder 1; the F1 oil port is communicated with the three-position four-way reversing valve 13 through an H1 oil port on an end cover of the first hydraulic cylinder 1; the H1 oil port is communicated with the rod cavity of the first hydraulic cylinder 1.
Also comprises a third hydraulic cylinder 3;
the second hydraulic cylinder 2 is provided with a two-stage two-position two-way reversing valve 5, a second one-way valve 7 and a second central pipe 12;
the inlet end of the second check valve 7 is communicated with the A2 oil port, and the other end of the second check valve is communicated with the rodless cavity of the second hydraulic cylinder 2;
the two-stage two-position two-way reversing valve 5 is communicated with two ends of the second one-way valve 7;
one end of the second central tube 12 is fixedly connected with the bottom of the cylinder body of the second hydraulic cylinder 2, and the other end of the second central tube extends into a second central hole of a second piston rod (9) of the second hydraulic cylinder 2 and is connected with the second piston rod 9 in a sliding and sealing manner;
a C2 oil port is formed in the second central tube 12, and the C2 oil port is communicated with the D1 oil port through a B2 oil port at the bottom of the cylinder body of the second hydraulic cylinder 2;
a D2 oil port and an E2 oil port are formed in the second piston rod 9;
the D2 oil port is matched with the C2 oil port; after the second piston rod 9 is completely extended out, the oil port C2 on the second piston rod 9 is communicated with the oil port D2; the D2 oil port is communicated with an A3 oil port at the bottom of the cylinder body of the third hydraulic cylinder through a pipeline; an A3 oil port is communicated with a rodless cavity of the second hydraulic cylinder 2;
the E2 oil port is communicated with the B3 oil port on the end cover of the third hydraulic cylinder 3 through an oil path in the second piston rod 9; after the second piston rod 9 is fully extended, the E2 oil port is communicated with the F2 oil port on the end cover of the second hydraulic cylinder 2; the F2 oil port is communicated with the E1 oil port through an H2 oil port on an end cover of the second hydraulic cylinder 2; the H2 oil port is communicated with the rod cavity of the second hydraulic cylinder 2.
The three-position four-way reversing valve 13 is of the type
The type of the primary two-position two-way reversing valve 4 is
The first one-way valve 6 is of the type
The first central tube 11 and the first central tube 12 are respectively hollow tube bodies with one closed ends.
The specific use method comprises the following steps:
when the arm folding crane extends, the three-position four-way reversing valve 13 works at the right position, oil flows through an A1 oil port at one end of a rodless cavity of the first hydraulic cylinder 1 and the first check valve to flow to the rodless cavity of the first hydraulic cylinder 1, the first hydraulic cylinder 1 extends, when the first piston rod 8 does not extend completely, an oil port C1 oil port formed in the first central tube 11 cannot be communicated with an oil port D1 formed in the first piston rod 8, so the oil cannot reach rodless cavities of the second hydraulic cylinder 2 and the third hydraulic cylinder 3, the rest hydraulic cylinders cannot extend, the oil in the rod cavity of the first hydraulic cylinder 1 flows back to an oil tank through an H1 oil port and the three-position four-way reversing valve 13, after the first piston rod 8 extends completely, an oil port C1 formed in the first central tube 11 is communicated with an oil port D1 formed in the first piston rod 8, and the oil flows through an oil port B1 oil port, an oil port C1, an oil port D1 oil, The oil pipe flows to an A2 oil port and a B2 oil port on one side of a rodless cavity of the second hydraulic cylinder 2, the oil flows to the rodless cavity of the second hydraulic cylinder 2 through an A2 oil port and a second check valve 7, because the first hydraulic cylinder 1 extends completely, an E1 oil port on the first piston rod is communicated with an F1 oil port on a cylinder cover, the oil in a rod cavity of the second hydraulic cylinder 2 flows through an H2 oil port, an oil way in the first piston rod, an E1 oil port, an F1 oil port, an H1 oil port and a three-position four-way reversing valve 13 to return to an oil tank, the second hydraulic cylinder 2 extends, when the second piston rod 9 does not extend completely, an D2 oil port on the second piston rod 9 is communicated with a C2 oil port arranged in a second central pipe 12, the oil cannot enter a rodless cavity of the third hydraulic cylinder 3, the third hydraulic cylinder 3 cannot extend, and when the second piston rod 9 extends completely, an D2 oil port is arranged on the second piston rod 9 and communicated with a C, the oil liquid flows to an A3 oil port on one side of a rodless cavity of the third hydraulic cylinder 3 through a B2 oil port, a second central tube 12, a C2 oil port, a D2 oil port, an oil circuit in the second piston rod 9 and an oil pipe, and the first hydraulic cylinder 1 and the second hydraulic cylinder 2 are completely extended out, so that the E1 oil port on the first piston rod 8 is communicated with an F1 oil port on a cylinder cover, and the E2 oil port on the second piston rod 9 is communicated with an F2 oil port on the cylinder cover, so that the oil liquid in a rod cavity of the third hydraulic cylinder 3 flows through the B3 oil port, the oil pipe, an oil circuit in the second piston rod 9, an E2 oil port, an F2 oil port, an H2 oil port, an oil circuit in the first piston rod 8, the E1 oil port, an F1 oil port, an H1 and the three-position.
When the folding arm crane retracts, the three-position four-way reversing valve 13 works at the left position, the three hydraulic cylinders are all in a completely extending state when the folding arm crane begins to retract, the second hydraulic cylinder 2 is not in a completely retracting position, the first-stage two-position two-way reversing valve 4 cannot be impacted, so the valve is in a closed state, the third hydraulic cylinder 3 is not in a completely retracting position, and the second-stage two-position two-way reversing valve 4 cannot be impacted, so the valve is also in a closed state, oil in rodless cavities of the first hydraulic cylinder 1 and the second hydraulic cylinder 2 cannot flow back to the oil tank through the two-position two-way reversing valves, so the first hydraulic cylinder 1 and the second hydraulic cylinder 2 cannot retract, the oil flows to a rod cavity of the third hydraulic cylinder 3 through an H1 oil port, an F1 oil port, an E1 oil port, an oil passage in the first piston rod 8, an H2 oil port, an F2 oil port, an E46, oil in a rodless cavity of the third hydraulic cylinder flows through an oil port A3, an oil port D2, an oil port C2, an oil port B2, an oil port D1, an oil port C1, a first central tube 11, an oil port B1 and a three-position four-way reversing valve 13 and flows back to an oil tank, the third hydraulic cylinder 3 retracts, after the third hydraulic cylinder completely retracts, the third piston rod 10 impacts a second-level two-way reversing valve 4, the oil port D1 is communicated with the oil port C1, the oil port C1, an oil port in the first piston rod 8 and an oil port H2 flow to a rod cavity of the second hydraulic cylinder 2, the oil in the rodless cavity of the second hydraulic cylinder 2 flows back to the oil tank through the oil port A3, the oil port D48325, the oil port C1, the oil port D1, the oil port B central tube 11, the oil port B1 and the oil port C1, and the oil port D1, when the second hydraulic cylinder 2 is completely retracted, the second piston rod 9 impacts the first-stage two-position two-way reversing valve 3, the oil circuit of the valve is communicated, at the moment, oil flows to the rod cavity of the first hydraulic cylinder 1 through the H1 oil port, and the oil in the rodless cavity of the first hydraulic cylinder 1 flows back to the oil tank through the first-stage two-position two-way reversing valve 3, the A1 oil port and the three-position four-way reversing valve 13. The sequential retraction action of the third hydraulic cylinder, the second hydraulic cylinder and the first hydraulic cylinder is realized.
The hydraulic system is not limited to three-section hydraulic cylinders, and the number of the suspension arms can be set according to actual conditions.
In summary, the hydraulic cylinder structure is modified to realize the extending action according to the first, second and third sequence; the retraction action is carried out in the third, second and first sequence, the defect of pressure control is overcome, the system pressure can be reduced compared with a one-way sequence valve control sequence telescopic hydraulic system, and the stability of the telescopic sequence is improved.

Claims (3)

1. The utility model provides a folding arm formula lorry crane multi-cylinder sequential telescopic hydraulic system which characterized in that: the hydraulic control system comprises a first hydraulic cylinder (1), a first central pipe (11), a primary two-position two-way reversing valve (4), a first one-way valve (6), a second hydraulic cylinder (2) and a three-position four-way reversing valve (13);
one end of the first central pipe (11) is fixedly connected with the bottom of the cylinder body of the first hydraulic cylinder (1), and the other end of the first central pipe extends into a first central hole of a first piston rod (8) of the first hydraulic cylinder (1) and is connected with the first piston rod (8) in a sliding and sealing manner;
the bottom of the cylinder body at one side of the rodless cavity of the first hydraulic cylinder (1) is provided with an A1 oil port and a B1 oil port which are respectively communicated with the three-position four-way reversing valve (13);
the inlet end of the first check valve (6) is communicated with the A1 oil port, and the outlet end of the first check valve is communicated with the rodless cavity of the first hydraulic cylinder (1); the primary two-position two-way reversing valve (4) is connected to two ends of the first one-way valve (6);
one end of the B1 oil port is communicated with the C1 oil port in the first central pipe (11), and the other end of the B1 oil port is communicated with the three-position four-way electromagnetic directional valve (13);
the first piston rod (8) is provided with a D1 oil port and an E1 oil port;
the D1 oil port is matched with the C1 oil port; the D1 oil port is communicated with an A2 oil port at the bottom of the cylinder body of the second hydraulic cylinder through a pipeline;
the E1 oil port is communicated with an H2 oil port on an end cover of the second hydraulic cylinder through an oil way in the first piston rod (8); after the first piston rod (8) is completely extended, the E1 oil port is communicated with an F1 oil port on an end cover of the first hydraulic cylinder (1); the F1 oil port is communicated with the three-position four-way reversing valve (13) through an H1 oil port on an end cover of the first hydraulic cylinder (1); the H1 oil port is communicated with the rod cavity of the first hydraulic cylinder (1).
2. A multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane according to claim 1, characterized by further comprising a third hydraulic cylinder (3);
a second-stage two-position two-way reversing valve (5), a second one-way valve (7) and a second central pipe (12) are arranged on the second hydraulic cylinder (2);
the inlet end of the second check valve (7) is communicated with the A2 oil port, and the other end of the second check valve is communicated with the rodless cavity of the second hydraulic cylinder (2);
the two-stage two-position two-way reversing valve (5) is communicated with two ends of the second one-way valve (7);
one end of the second central pipe (12) is fixedly connected with the bottom of the cylinder body of the second hydraulic cylinder (2), and the other end of the second central pipe extends into a second central hole of a second piston rod (9) of the second hydraulic cylinder (2) and is connected with the second piston rod (9) in a sliding and sealing manner;
a C2 oil port is formed in the second central pipe (12), and the C2 oil port is communicated with the D1 oil port through a B2 oil port at the bottom of the cylinder body of the second hydraulic cylinder (2);
the second piston rod (9) is provided with a D2 oil port and an E2 oil port;
the D2 oil port is matched with the C2 oil port; the D2 oil port is communicated with an A3 oil port at the bottom of the cylinder body of the third hydraulic cylinder through a pipeline;
the E2 oil port is communicated with the B3 oil port on the end cover of the third hydraulic cylinder (3) through an oil path in the second piston rod (9); after the second piston rod (9) is completely extended, the E2 oil port is communicated with an F2 oil port on an end cover of the second hydraulic cylinder (2); the F2 oil port is communicated with the E1 oil port through an H2 oil port on an end cover of the second hydraulic cylinder (2); the H2 oil port is communicated with a rod cavity of the second hydraulic cylinder (2).
3. The multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane according to claim 1, characterized in that the type of the three-position four-way reversing valve (13) is
The multi-cylinder sequential telescopic hydraulic system of a folding arm type lorry-mounted crane according to claim 1, characterized in that the type of the primary two-position two-way reversing valve (4) is
Multi-cylinder sequential telescopic hydraulic system of folding arm type lorry-mounted crane according to claim 1, characterized in that the type of the first check valve (6) is
The multi-cylinder sequential telescopic hydraulic system of the folding arm type lorry-mounted crane according to claim 1, characterized in that the first central pipe (11) and the first central pipe (12) are respectively hollow pipes with one closed end.
CN202010407716.9A 2020-05-14 2020-05-14 Multi-cylinder sequential telescopic hydraulic system of folding arm type lorry-mounted crane Pending CN111442006A (en)

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CN202010407716.9A CN111442006A (en) 2020-05-14 2020-05-14 Multi-cylinder sequential telescopic hydraulic system of folding arm type lorry-mounted crane

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Application Number Priority Date Filing Date Title
CN202010407716.9A CN111442006A (en) 2020-05-14 2020-05-14 Multi-cylinder sequential telescopic hydraulic system of folding arm type lorry-mounted crane

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CN111442006A true CN111442006A (en) 2020-07-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113236618A (en) * 2021-05-11 2021-08-10 燕山大学 Multi-cylinder sequential telescopic hydraulic system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113236618A (en) * 2021-05-11 2021-08-10 燕山大学 Multi-cylinder sequential telescopic hydraulic system

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