CN115180513A - Single-cylinder bolt telescopic system, control method and crane - Google Patents
Single-cylinder bolt telescopic system, control method and crane Download PDFInfo
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- CN115180513A CN115180513A CN202210795242.9A CN202210795242A CN115180513A CN 115180513 A CN115180513 A CN 115180513A CN 202210795242 A CN202210795242 A CN 202210795242A CN 115180513 A CN115180513 A CN 115180513A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
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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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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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
- 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
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Actuator (AREA)
Abstract
The invention provides a single-cylinder bolt telescopic system, a control method and a crane, wherein when a cylinder arm pin system drives a cylinder arm pin to act, oil is not supplied through a movable core pipe in a telescopic oil cylinder any more, but an independent hydraulic pipeline is adopted; the hydraulic oil circuit for driving the cylinder arm pin mechanism to act is independent from the action of the telescopic oil cylinder. The cylinder arm pin control valve assembly and the emergency quick-change connector are transferred to the outside of the suspension arm from the inside of the suspension arm. The maintenance difficulty and cost of the system are reduced, the processing difficulty and weight of the oil cylinder are reduced, the problem that the movable core pipe limits the inner diameter of a piston rod of the telescopic oil cylinder is solved, and the single-cylinder bolt system can be popularized to products with medium and small tonnage; the maintainability of the telescopic system is improved.
Description
Technical Field
The invention belongs to the technical field of heavy machinery, and particularly relates to a single-cylinder bolt telescopic system, a control method and a crane.
Background
The performance of the telescopic system of the crane has very critical influence on the overall performance, the hoisting capacity and the like of the crane. The crane telescoping system commonly used at present mainly comprises 2 types: the oil cylinder is provided with a rope type telescopic system and a single-cylinder bolt type telescopic system. The single-cylinder bolt type telescopic system has the advantages that the 'cordless' telescopic state is realized, the internal mechanism of the crane boom is simplified, the limitation of the crane on the extension arm length, the number of sections and the like is broken through, and the performance of the telescopic system is integrally improved.
The universal form of the single-cylinder bolt telescopic system in the industry at present: an independent oil supply system is adopted to supply oil to the cylinder head body through the movable core pipe of the telescopic oil cylinder; a cylinder pin and an arm pin are pulled down through an oil cylinder arranged in the cylinder head body, and the cylinder pin and the arm pin are reset by a spring; and the small cavity pressure of the telescopic oil cylinder is utilized to open the balance valve to realize the retraction of the telescopic oil cylinder.
(2) The automatic telescopic process introduction of the single-cylinder bolt type crane is as follows:
the telescopic function of the suspension arm is realized by the combined action of the telescopic oil cylinder, the arm pin and the cylinder pin, and the telescopic function is realized by the following specific modes:
when the arm pin is inserted, the arm pin is inserted into the arm pin hole by the aid of the reset spring, and the two adjacent sections of the suspension arms are locked together. When the cylinder pin is pulled out, the cylinder pin is separated from the cylinder pin hole on the suspension arm, the telescopic oil cylinder is separated from the suspension arm, and the telescopic cylinder can be retracted. When the cylinder pin is inserted, the cylinder pin is inserted into the cylinder pin hole on the suspension arm, the telescopic oil cylinder and the suspension arm are locked together, and the extension of the belt arm can be realized.
A suspension arm stretching flow:
forward arm position finding: cylinder pin pull → arm position finding → cylinder pin insertion at arm position finding → arm pin pull → cylinder band arm extension → (decelerating in advance and releasing the arm pin) arm pin insertion.
And (3) finding the arm position backwards, namely pulling a cylinder pin → retracting the cylinder to find the arm position → inserting the cylinder pin to find the arm position → pulling the arm pin → extending the oil cylinder with the arm → inserting the arm pin by decelerating in advance and releasing the arm pin.
A suspension arm shrinking process:
retracting the front arm: cylinder pin → arm positioning → cylinder pin insertion → arm pin extraction → arm retraction → arm pin insertion.
Retracting the front arm: arm pin pull → arm retract → arm pin insert.
The hydraulic principle of the prior single-cylinder bolt telescopic control is shown in figure 1. The hydraulic control system mainly comprises three parts, namely a hydraulic control part of a telescopic oil cylinder, a hydraulic loop for plugging and unplugging a cylinder arm pin and a pilot loop. The extending and retracting actions of the telescopic oil cylinder 14 are controlled by the variable hydraulic pump 11 in cooperation with the three-position four-way reversing valve 12 and the balance valve 13.
When the telescopic oil cylinder works, the displacement of the pump is controlled by adjusting the current output to the variable hydraulic pump by the controller, and further the movement speed of the telescopic oil cylinder is controlled. The direction of oil is changed by reversing the three-position four-way electromagnetic valve, and the switching between the extending and retracting actions of the telescopic oil cylinder is realized. The cylinder pin pulling and arm pin pulling are completed by another hydraulic system, and oil output by the hydraulic pump 116 passes through the two-position four-way electromagnetic directional valve 117, the ball valve 119, the movable core tube 15 in the telescopic cylinder and the cylinder arm pin switching valve 17, enters the arm pin cylinder 111 or the cylinder pin cylinder 112, and completes the action of the arm pin pulling mechanism 115 or the cylinder pin pulling mechanism 114. The cylinder arm pin switching valve controls the switching of the two actions of pulling the cylinder pin and pulling the arm pin. The overflow valve 118 at the outlet of the hydraulic pump is used for limiting and protecting the action pressure of the cylinder arm pin and reducing the pressure impact when the cylinder arm pin and the arm pin are pulled out.
In addition, in order to ensure that the telescopic oil cylinder can continue to operate under the condition that the cylinder arm pin switching valve 17 fails, an emergency operation circuit is designed in the system. The emergency action of the cylinder arm pin is realized by arranging a quick-change connector 19 at the outlet of the hydraulic pump 116 and connecting the hose 110 with the cylinder arm pin driving pipeline. Further, the hose is detachable, and the quick change connectors 19d and 19c at the two ends of the hose are normally disconnected from the hydraulic pump outlet quick change connector 19e and the cylinder arm pin and cylinder outlet. When the cylinder pin is pulled out in an emergency state, the quick-change connector 19c at one end of the hose is connected with the quick-change connector 19b at the outlet of the cylinder pin oil cylinder, and oil output by the hydraulic pump enters the cylinder pin oil cylinder through the hose to complete the cylinder pin pulling action. When the arm pin is pulled out in an emergency, the quick-change connector 19c at one end of the hose is connected with the arm pin oil cylinder outlet 19 a.
FIG. 1 is a schematic diagram of a prior art telescopic hydraulic system.
The prior art has the following disadvantages:
1) The principle of the single-cylinder bolt telescopic system is an industry general technical route, and the flow of a movable core pipe is ensured and the system pressure is ensured when a telescopic oil cylinder is telescopic, so that the power loss is large and the energy-saving performance of the system is poor. Meanwhile, the movable core tube has a complex structure and higher requirements on processing precision, so that the telescopic oil cylinder has high price, and the single-cylinder bolt telescopic system is difficult to popularize and apply in small-tonnage products.
2) The telescopic oil cylinder is poor in compactness, and the cylinder arm pin control valve assembly is also arranged in the crane boom, so that the maintainability is poor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a single-cylinder bolt telescopic system, a control method and a crane, and meets the requirements of different working conditions of the telescopic system on a telescopic hydraulic system.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the invention provides a single-cylinder bolt telescopic system which comprises a single-cylinder bolt telescopic main system and a cylinder arm pin action control system;
the single-cylinder bolt telescopic main system comprises a telescopic oil cylinder and a telescopic hydraulic system for driving the telescopic oil cylinder; the telescopic oil cylinder is not internally provided with a movable core pipe;
the cylinder arm pin action control system comprises a cylinder arm pin mechanism and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism to act;
the telescopic hydraulic system and the cylinder arm pin hydraulic system are independent.
The effect that above-mentioned setting reached: the invention provides a single-cylinder bolt telescopic hydraulic system.A cylinder arm pin system drives a cylinder arm pin to act, and oil is not supplied through a movable core pipe in a telescopic oil cylinder any more, but an independent hydraulic pipeline is adopted; the hydraulic oil circuit for driving the cylinder arm pin mechanism to act is independent from the action of the telescopic oil cylinder.
Furthermore, the single-cylinder bolt telescopic main system comprises a variable hydraulic pump, a hydraulic control proportional reversing valve, a telescopic oil cylinder and two electric proportional pressure reducing valves;
the high-pressure oil of the variable hydraulic pump controls the extending and retracting actions of the telescopic oil cylinder through a hydraulic control proportional reversing valve; the two electric proportional pressure reducing valves respectively control the control pressure at two ends of the valve rod of the hydraulic control proportional reversing valve, and the valve rod of the hydraulic control proportional reversing valve can be controlled to move by adjusting the input current of the electric proportional pressure reducing valves.
The effect that above-mentioned setting reached: the valve rod displacement of the hydraulic control proportional reversing valve is related to the magnitude of the current input into the electric proportional pressure reducing valve. Therefore, the requirements of different working conditions of the telescopic system on the telescopic hydraulic system can be met by adjusting the current output to the electric proportional valve pressure reducing valve by the controller.
Furthermore, the system also comprises a balance valve arranged between the hydraulic control proportional reversing valve and the telescopic oil cylinder, and one end of the balance valve is connected with a third electric proportional pressure reducing valve.
The effect that above-mentioned setting reached: when the telescopic oil cylinder retracts, the opening of the balance valve can be controlled by adjusting the output current of the electro-proportional pressure reducing valve III to control the controllability of the extending arm.
Furthermore, the cylinder arm pin hydraulic system comprises a hydraulic pump, a three-position four-way switching valve, a duplex hose, an arm pin oil cylinder, a cylinder pin oil cylinder and an oil tank which are communicated with each other;
the cylinder arm pin mechanism comprises a return spring, a cylinder pin structure communicated with a cylinder pin oil cylinder and an arm pin mechanism communicated with the arm pin oil cylinder;
the arm pin oil cylinder comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel, the cylinder barrel of the arm pin oil cylinder is fixed, and the inside of the arm pin oil cylinder is divided into a rodless cavity and a rod cavity;
the cylinder pin oil cylinder comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel, the cylinder barrel of the cylinder pin oil cylinder is fixed, and the interior of the cylinder pin oil cylinder is divided into a rodless cavity and a rod cavity;
when the rodless cavity of the cylinder pin oil cylinder moves leftwards during oil inlet, the cylinder pin mechanism is pushed to move leftwards; when the rodless cavity returns oil, the cylinder pin oil cylinder and the cylinder pin mechanism reset under the action of the reset spring;
when the rodless cavity of the arm pin oil cylinder is moved rightwards when oil is fed, the arm pin mechanism is pushed to move rightwards; when oil is returned from the rodless cavity, the arm pin oil cylinder and the arm pin mechanism reset under the action of the reset spring;
the cylinder arm pin switching valve is a three-position four-way switching valve used for realizing the switching of cylinder pin pulling and arm pin pulling actions;
the duplex hose is arranged among the cylinder pin oil cylinder, the arm pin oil cylinder and the three-position four-way valve;
when the left position of the cylinder arm pin switching valve is electrified to work, high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve and the duplex hose to reach a rodless cavity of the arm pin oil cylinder; under the action of hydraulic pressure, a piston rod of the oil cylinder drives the arm pin pulling mechanism to act so as to pull the arm pin;
when the arm pin needs to be reset, the switching valve of the cylinder arm pin is powered off, the rodless cavity of the arm pin oil cylinder returns oil, and under the action of the spring force of the reset spring, oil in the rodless cavity of the arm pin oil cylinder flows back to the oil tank.
When the right position of the cylinder arm pin switching valve is electrified to work, high-pressure oil in the hydraulic pump reaches a rodless cavity of the cylinder pin oil cylinder through the cylinder arm pin switching valve, a cylinder barrel of the cylinder pin oil cylinder is fixed, and an oil cylinder piston rod drives the cylinder pin pulling mechanism to act under the action of oil hydraulic pressure so as to finish the cylinder pin pulling action.
When the cylinder pin oil cylinder is reset, oil in a rodless cavity of the cylinder pin oil cylinder returns through the duplex hose, the cylinder arm pin switching valve is de-energized, the rodless cavity of the cylinder pin oil cylinder returns, and under the spring force action of the reset spring, the oil in the rodless cavity of the cylinder pin oil cylinder flows back to the oil tank.
Further, the cylinder arm pin hydraulic system further includes a line holding mechanism, the line holding mechanism including:
a guide device which is bypassed by the duplex hose; and
and the elastic device is connected with the guide device and used for driving the guide device to keep the duplex hose in a stretching state when the telescopic oil cylinder performs telescopic action.
The effect that above-mentioned setting reached: because a movable core tube in the telescopic oil cylinder is omitted, the cylinder arm pin system of the invention adopts an independent hydraulic pipeline when driving the cylinder arm pin to act. The duplex hose is guided and tensioned by the guide device and the elastic device. When the telescopic oil cylinder is telescopic, the duplex hose is tensioned under the action of the elastic device, and smooth oil supply is ensured.
Furthermore, a right ball valve is arranged between the three-position four-way switching valve and the arm pin oil cylinder; a left Lu Qiufa is arranged between the three-position four-way switching valve and the cylinder pin oil cylinder;
be equipped with quick-change coupler a between right side way ball valve and the arm round pin hydro-cylinder, be equipped with quick-change coupler b between left side way ball valve and the cylinder round pin hydro-cylinder, be equipped with quick-change coupler e between left side Lu Qiufa and the hydraulic pump, quick-change coupler b and quick-change coupler e directly are equipped with the hose that both ends are connected with quick-change coupler c and quick-change coupler d.
The effect that above-mentioned setting reached: when the cylinder pin needs to be pulled out in an emergency, the left-way ball valve is closed, and the quick-change connector e is in butt joint with the quick-change connector d of the hose; and meanwhile, the quick-change connector c at the other end of the hose is connected with the quick-change connector b. The high-pressure oil of the hydraulic pump is connected with the duplex hose system through the emergency hose. And high-pressure oil enters a rodless cavity of the cylinder pin oil cylinder to complete emergency cylinder pin pulling.
When the arm pin is pulled out in an emergency, the right ball valve is closed, the quick-change connector is externally connected with a high-pressure oil source, and high-pressure oil reaches a rodless cavity of the arm pin oil cylinder, so that the arm pin is pulled out in an emergency.
Further, the three-position four-way switching valve is arranged outside the crane arm.
The effect that above-mentioned setting reached: compared with the original scheme, the cylinder arm pin switching valve is more convenient to replace and maintain; meanwhile, the duplex hose is arranged outside the telescopic oil cylinder, so that the maintainability is greatly improved.
In a second aspect, the invention provides a method for controlling a single-cylinder bolt telescopic system, which is based on the system of the first aspect and comprises the following steps:
the requirements of different working conditions of the telescopic system on the telescopic hydraulic system are met by adjusting the current output to the electric proportional valve pressure reducing valve.
Further, the method also comprises a cylinder arm pin mechanism action method and/or an emergency control method:
the cylinder arm pin mechanism action method comprises the following steps:
the left position of the cylinder arm pin switching valve is electrified to work, and high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve and the duplex hose to reach a rodless cavity of the arm pin oil cylinder; under the action of hydraulic pressure, a piston rod of the oil cylinder drives the arm pin pulling mechanism to act so as to pull the arm pin;
when the arm pin needs to be reset, the switching valve of the cylinder arm pin is powered off, the rodless cavity of the arm pin oil cylinder returns oil, and under the action of the spring force of the reset spring, oil in the rodless cavity of the arm pin oil cylinder flows back to the oil tank.
When the right position of the cylinder arm pin switching valve is electrified to work, high-pressure oil in the hydraulic pump reaches a rodless cavity of the cylinder pin oil cylinder through the cylinder arm pin switching valve, a cylinder barrel of the cylinder pin oil cylinder is fixed, and an oil cylinder piston rod drives the cylinder pin pulling mechanism to act under the action of oil hydraulic pressure so as to finish the cylinder pin pulling action.
When the cylinder pin oil cylinder is reset, oil in a rodless cavity of the cylinder pin oil cylinder returns through the duplex hose, the cylinder arm pin switching valve is de-energized, the rodless cavity of the cylinder pin oil cylinder returns, and under the spring force action of the reset spring, the oil in the rodless cavity of the cylinder pin oil cylinder flows back to the oil tank.
The emergency control method comprises the following steps:
when the cylinder pin needs to be pulled out in an emergency, the left-way ball valve is closed, and the quick-change connector e is in butt joint with the quick-change connector d of the hose; and meanwhile, the quick-change connector c at the other end of the hose is connected with the quick-change connector b. The high-pressure oil of the hydraulic pump is connected with the duplex hose system through the emergency hose. And high-pressure oil enters a rodless cavity of the cylinder pin oil cylinder to complete emergency cylinder pin pulling.
When the arm pin is pulled out in an emergency, the right ball valve is closed, the quick-change connector is externally connected with a high-pressure oil source, and high-pressure oil reaches a rodless cavity of the arm pin oil cylinder, so that the arm pin is pulled out in an emergency.
In a third aspect, the present invention provides a crane comprising a single cylinder bolt retraction system as described in the first aspect.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a single-cylinder bolt telescopic hydraulic system.A cylinder arm pin system drives a cylinder arm pin to act, and oil is not supplied through a movable core pipe in a telescopic oil cylinder any more, but an independent hydraulic pipeline is adopted; the hydraulic oil circuit for driving the cylinder arm pin mechanism to act is independent from the action of the telescopic oil cylinder. The cylinder arm pin control valve assembly and the emergency quick-change connector can be arranged outside the crane boom according to requirements, and the maintainability is improved.
2. The system cancels the movable core tube in the telescopic oil cylinder, the structure of the telescopic oil cylinder is simplified, the processing difficulty and the weight are reduced, and the system cost is reduced; the maintenance difficulty and cost of the system are reduced, the processing difficulty and weight of the oil cylinder are reduced, and meanwhile, the difficulty of limiting the inner diameter of a piston rod of the telescopic oil cylinder by a movable core pipe is overcome, so that the single-cylinder bolt system can be popularized to products with medium and small tonnage.
Drawings
FIG. 1 is a schematic diagram of a prior art telescopic hydraulic system;
FIG. 2 is a schematic diagram of the telescopic hydraulic system of the present invention;
in the figure: 11. a variable displacement hydraulic pump; 12. a three-position four-way reversing valve; 13. a balancing valve; 14. a telescopic hydraulic cylinder; 15. a movable core tube; 16. a one-way valve; 17. a cylinder arm pin switching valve; 18. damping; 19. a quick-change connector; 110. a hose; 111. an arm pin cylinder; 112. a cylinder pin cylinder; 113. a return spring; 114. a cylinder pin mechanism; 115. an arm pin mechanism; 116. a hydraulic pump; 117. a two-position four-way electromagnetic directional valve; 118. an overflow valve; 119. a ball valve;
21. a variable displacement hydraulic pump; 22. a first electric proportional pressure reducing valve; 23. a second electric proportional pressure reducing valve; 24. a hydraulic control proportional directional valve; 25. an electric proportional pressure reducing valve III; 26. a balancing valve; 27. an arm pin mechanism; 28. a cylinder pin mechanism; 29. a return spring; 210. a cylinder pin cylinder; 211. an arm pin cylinder; 212. a duplex hose; 213. a guide device; 214. an elastic device; 215. a telescopic oil cylinder; 216. a quick-change connector; 217. a hose; 218. a ball valve; 218a, left Lu Qiufa; 218b, right ball valve; 219. a cylinder arm pin switching valve; 220. a hydraulic pump;
in the figure, 216a, 216b, 216c, 216d and 216e respectively represent five quick-change connectors a, b, c, d and e at different positions, 218a and 218b respectively represent a left Lu Qiufa and a right ball valve, and Y4a and Y4b respectively represent the left position and the right position of a three-position four-way valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the present embodiment and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present embodiment.
The first embodiment is as follows:
the embodiment provides a single-cylinder bolt telescopic hydraulic system which comprises a single-cylinder bolt telescopic main system and a cylinder arm pin action control system; the single-cylinder bolt telescopic main system comprises a telescopic oil cylinder and a telescopic hydraulic system for driving the telescopic oil cylinder; a movable core pipe is not arranged in the telescopic oil cylinder; the cylinder arm pin action control system comprises a cylinder arm pin mechanism and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism to act; the telescopic hydraulic system and the cylinder arm pin hydraulic system are independent.
When the cylinder arm pin system drives the cylinder arm pin to act, oil is not supplied through a movable core pipe in the telescopic oil cylinder any more, but an independent hydraulic pipeline is adopted; the hydraulic oil circuit for driving the cylinder arm pin mechanism to act is independent from the action of the telescopic oil cylinder.
The cylinder arm pin control valve assembly and the emergency quick-change connector can be arranged outside the crane boom according to requirements, and the maintainability is improved.
The system cancels the movable core tube in the telescopic oil cylinder, the structure of the telescopic oil cylinder is simplified, the processing difficulty and the weight are reduced, and the system cost is reduced; meanwhile, the difficulty that the inner diameter of a piston rod of the telescopic oil cylinder is limited by the movable core pipe is overcome, so that the single-cylinder plug pin system can be popularized to products with medium and small tonnage.
The hydraulic schematic diagram of the single-cylinder bolt telescopic system is shown in fig. 2, and the high-pressure oil of the variable hydraulic pump 21 controls the extending and retracting actions of the telescopic oil cylinder 215 through the hydraulic control proportional directional valve 24. The two electric proportional pressure reducing valves Y1-22 and Y2-23 respectively control the control pressure at two ends of the valve rod of the hydraulic control proportional reversing valve. Therefore, the valve rod of the hydraulic control proportional reversing valve can be controlled to move by adjusting the input current of the electro-proportional pressure reducing valve, namely, the valve rod displacement of the hydraulic control proportional reversing valve is related to the input current of the electro-proportional pressure reducing valve. Therefore, the requirements of different working conditions of the telescopic system on the telescopic hydraulic system can be met by adjusting the current output by the controller to the electric proportional valve pressure reducing valve.
Specifically, during the retracting operation of the telescopic cylinder, the opening of the telescopic balance valve 26 can be controlled by adjusting the output current of the electro-proportional pressure reducing valve Y325 to control the boom controllability.
Fig. 2 is a hydraulic schematic diagram of the telescopic system.
The invention provides a hydraulic system for driving a cylinder arm pin mechanism to act, which ensures that a hydraulic oil circuit for controlling the action of the cylinder arm pin mechanism and the action of a telescopic oil cylinder are not influenced mutually.
The cylinder arm pin action control system of the embodiment comprises a cylinder arm pin mechanism 27 and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism 27 to act;
the cylinder arm pin hydraulic system comprises a hydraulic pump 220, a three-position four-way switching valve, a duplex hose 217212, an arm pin oil cylinder 211 and a cylinder pin oil cylinder 210 which are communicated with each other;
the cylinder arm pin mechanism 27 includes a cylinder pin structure in communication with a cylinder pin cylinder 210 and an arm pin mechanism 27 in communication with an arm pin cylinder 211.
The cylinder pin oil cylinder 210 is used for controlling the telescopic part of the telescopic oil cylinder 215 to be locked or separated with or from arm joints of the telescopic arm by driving the cylinder pin of the telescopic arm to be plugged and pulled, the arm pin oil cylinder 211 is used for controlling the adjacent two arm joints to be locked or separated by driving the arm pin of the telescopic arm to be plugged and pulled, so that the telescopic part of the telescopic oil cylinder 215 can drive the arm joints to be telescopic when being telescopic relative to the fixed part of the telescopic oil cylinder 215, and the cylinder arm pin hydraulic system is further provided with an oil supply oil path allowing hydraulic oil to flow to the arm pin oil cylinder 211 and the cylinder pin oil cylinder 210 and an oil discharge oil path allowing the hydraulic oil to be discharged from the arm pin oil cylinder 211 and the cylinder pin oil cylinder 210.
The arm pin oil cylinder 211 comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel, the cylinder barrel of the arm pin oil cylinder 211 is fixed, and the interior of the arm pin oil cylinder is divided into a rodless cavity and a rod cavity;
the cylinder pin oil cylinder 210 comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel, the cylinder barrel of the cylinder pin oil cylinder 210 is fixed, and the interior of the cylinder pin oil cylinder is divided into a rodless cavity and a rod cavity;
and wherein, the cylinder pin cylinder 210 is a double-acting single-rod cylinder, when the cylinder pin cylinder 210 drives the cylinder pin to be pulled out, the rod cavity of the cylinder pin cylinder 210 is communicated with the oil supply oil path, and when the cylinder pin cylinder 210 drives the cylinder pin to be inserted, the rod cavity of the cylinder pin cylinder 210 is communicated with the rodless cavity to form a differential cylinder and is communicated with the oil discharge oil path;
the arm pin oil cylinder 211 is a double-acting single-rod oil cylinder, when the arm pin oil cylinder 211 drives the arm pin to be pulled out, a rod cavity of the arm pin oil cylinder 211 is communicated with an oil supply oil path, and when the arm pin oil cylinder 211 drives the arm pin to be inserted, the rod cavity of the arm pin oil cylinder 211 is communicated with a rodless cavity to form a differential oil cylinder and is communicated with an oil discharge oil path.
The hydraulic pump 220 serves as an oil source of the cylinder arm pin removing system, and the three-position four-way switching valve 219 serves as a cylinder arm pin control valve for switching the operation of the cylinder arm pin removing system and the operation of the arm pin removing system. When the cylinder arm pin switching valve Y4a is energized to operate in the left position, hydraulic pump high-pressure oil reaches the rodless cavity of the arm pin cylinder 211 from the cylinder arm pin switching valve 219 through the ball valve 218b and the duplex hose 212. The cylinder barrel of the arm pin oil cylinder is fixed, and the piston rod of the oil cylinder drives the arm pin pulling mechanism 27 to act under the action of oil hydraulic pressure, so that arm pin pulling is realized. When the arm pin needs to be reset, the switching valve of the cylinder arm pin is powered off, the rodless cavity of the arm pin oil cylinder returns oil, and under the action of the spring force of the reset spring 29, oil in the rodless cavity flows back to the oil tank.
When the cylinder arm pin switching valve Y4b is electrified, the right position works, high-pressure oil in the hydraulic pump reaches a rodless cavity of the cylinder pin oil cylinder 210 through the cylinder arm pin switching valve, a cylinder barrel of the cylinder pin oil cylinder is fixed, and an oil cylinder piston rod drives the cylinder pin pulling mechanism 28 to act under the action of oil hydraulic pressure, so that the cylinder pin pulling action is completed. When resetting, the oil in the rodless cavity of the cylinder pin oil cylinder returns through the duplex hose, and the resetting principle of the cylinder pin is similar to that of the arm pin, so that the details are not repeated.
The duplex hose 212 is arranged between the cylinder, the arm pin oil cylinders 210 and 211 and the three-position four-way valve 219;
the cylinder arm pin hydraulic system further comprises guiding means 213 and resilient means 214;
the duplex hose 212 is guided and tensioned by a guide 213 and a resilient means 214. In some embodiments, the line retention mechanism comprises: a guide 213 and a resilient means 214. The duplex hose 212 may be prevented from folding by bypassing the guide 213 and may be able to translate and rotate with the movement of the guide 213. The elastic device 214 is connected to the guide device 213, and is used for keeping the duplex hose 212 in a stretched state by driving the guide device 213 when the telescopic cylinder performs a telescopic motion. That is, the elastic means 214 places the duplex hose 212 in tension by applying a force to the guide means 213 away from the cylinder rod end.
The guiding device 213 is a movable pulley, and the elastic device 214 is a tension spring, an elastic rope or a coil spring. A movable pulley, which is wound by the duplex hose 212; the elastic device is connected with the movable pulley and used for driving the movable pulley to enable the flexible conveying pipeline to keep a stretching state when the telescopic oil cylinder performs telescopic action.
Considering that the duplex hose 212 may be overlapped and squeezed by itself during the telescopic cylinder extending and retracting process, or squeezed by other components in the single-cylinder bolt telescopic system or the telescopic arm system, this may cause problems such as poor flowing of the fluid working medium or broken pipelines. Therefore, in some embodiments of the present invention, a pipe retaining mechanism is further included in the single cylinder latch retraction system, which acts on the duplex hose 212 for maintaining the stretched state of the duplex hose 212 when the retraction cylinder performs a retraction action. The pipeline holding mechanism can keep the duplex hose 212 in a non-extrusion and folding extension state all the time by keeping the extension state of the duplex hose 212 when the telescopic oil cylinder performs telescopic action, thereby keeping the fluid working medium to flow smoothly.
The elastic device 214 preferably employs an elastic element, such as a tension spring, an elastic rope or a coil spring, which can make the structure more compact and the cost less. In other embodiments, the elastic device 214 may also be a winding mechanism or a piston-cylinder mechanism, which can adjust the pulling force according to the expansion and contraction of the expansion and contraction cylinder.
It should be further explained that, because a movable core tube in the telescopic oil cylinder is eliminated, the cylinder arm pin system of the invention adopts an independent hydraulic pipeline when driving the cylinder arm pin to act. The duplex hose 212 is guided and tensioned by a guide 213 and an elastic device 214. When the telescopic oil cylinder is telescopic, the duplex hose 212 is tensioned under the action of the elastic device, and smooth oil supply is ensured.
The quick-change connector 216 in this embodiment is provided with 5: quick-change connector a216a, quick-change connector b216b, quick-change connector c216c, quick-change connector d216d and quick-change connector e216e.
A quick-change connector a216a is arranged between the right-way ball valve and the arm pin oil cylinder, a quick-change connector b216b is arranged between the left-way ball valve and the cylinder pin oil cylinder, a quick-change connector e216e is arranged between the left-way ball valve Lu Qiufa and the hydraulic pump, and hoses with two ends connected with a quick-change connector c216c and a quick-change connector d216d are directly arranged on the quick-change connectors b216b and the quick-change connectors e216e.
The embodiment also provides a control method of the single-cylinder bolt telescopic system, which comprises a cylinder arm pin mechanism action method and/or an emergency control method:
the cylinder arm pin mechanism action method of the embodiment comprises the following steps:
the left position of the cylinder arm pin switching valve is electrified to work, and high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve and the duplex hose to reach a rodless cavity of the arm pin oil cylinder; under the action of hydraulic pressure, a piston rod of the oil cylinder drives the arm pin pulling mechanism to act so as to pull the arm pin;
when the arm pin needs to be reset, the switching valve of the cylinder arm pin is powered off, the rodless cavity of the arm pin oil cylinder returns oil, and under the action of the spring force of the reset spring, oil in the rodless cavity of the arm pin oil cylinder flows back to the oil tank.
When the right position of the cylinder arm pin switching valve is electrified to work, high-pressure oil in the hydraulic pump reaches a rodless cavity of the cylinder pin oil cylinder through the cylinder arm pin switching valve, a cylinder barrel of the cylinder pin oil cylinder is fixed, and an oil cylinder piston rod drives the cylinder pin pulling mechanism to act under the action of oil hydraulic pressure so as to finish the cylinder pin pulling action.
When the cylinder pin oil cylinder is reset, oil in a rodless cavity of the cylinder pin oil cylinder returns through the duplex hose, the cylinder arm pin switching valve is de-energized, the rodless cavity of the cylinder pin oil cylinder returns, and under the spring force action of the reset spring, the oil in the rodless cavity of the cylinder pin oil cylinder flows back to the oil tank.
The cylinder arm pin emergency action control method of the embodiment comprises the following steps:
the requirements of different working conditions of the telescopic system on the telescopic hydraulic system are met by adjusting the current output to the electric proportional valve pressure reducing valve;
when the cylinder pin needs to be pulled out in an emergency, the left-way ball valve 218a is closed, and the quick-change connector e216e is in butt joint with the quick-change connector d216d of the hose 217; while the quick-change coupling c216c at the other end of the hose is connected with the quick-change coupling b216 b. The high-pressure oil of the hydraulic pump is connected with the duplex hose system through the emergency hose. And high-pressure oil enters a rodless cavity of the cylinder pin oil cylinder to complete emergency cylinder pin pulling.
When the arm pin is pulled out in an emergency, the right ball valve 218b is closed, the quick-change connector is externally connected with a high-pressure oil source, and high-pressure oil reaches a rodless cavity of the arm pin oil cylinder, so that the arm pin is pulled out in an emergency.
It should be further noted that, in the present invention, the cylinder arm pin switching valve 219 is disposed outside the boom, and compared with the original solution, the replacement and maintenance of the cylinder arm pin switching valve are more convenient; meanwhile, the duplex hose is arranged outside the telescopic oil cylinder, so that the maintainability is greatly improved.
The implementation principle is as follows: the invention realizes the emergency cylinder pulling arm pin through the combination of the ball valve and the quick-change connector (which can be completely arranged in the arm or outside the arm).
The invention improves the reliability and maintainability of the telescopic system, reduces the weight and cost: the hydraulic system and the control method for controlling the cylinder arm pin mechanism to act are provided, so that a hydraulic oil path for driving the cylinder arm pin mechanism to act does not influence the action of the telescopic oil cylinder, and the interference between the systems is avoided. When the cylinder arm pin system drives the cylinder arm pin to act, oil is not required to be supplied through a movable core pipe in the telescopic oil cylinder, and an independent hydraulic pipeline is adopted;
when the cylinder arm pin system drives the cylinder arm pin to act, oil is not supplied through a movable core pipe in the telescopic oil cylinder any more, but an independent hydraulic pipeline is adopted; the hydraulic oil circuit for driving the cylinder arm pin mechanism to act is independent from the action of the telescopic oil cylinder. The cylinder arm pin control valve assembly can be arranged inside or outside the crane boom according to design requirements, maintenance convenience is improved, a movable core pipe in the telescopic oil cylinder is omitted, the structure of the telescopic oil cylinder is simplified, processing difficulty is reduced, cost of the telescopic oil cylinder is greatly reduced, and weight of the oil cylinder can be reduced by 100-400Kg.
In addition, the invention solves the contradiction that the movable core tube limits the inner diameter of the piston rod of the telescopic oil cylinder.
In the invention, the technical scheme of the invention can be replaced by adopting the following means:
1) The three-position four-way valve 219 can be replaced by two-position three-way valves to switch the cylinder arm pin pulling function, but the cost is increased. The ball valve 218 may be manually or electrically operated, and the present invention is not limited thereto.
2) The three-position four-way valve 219 for controlling the operation of the arm pin can also perform the function of pulling the arm pin if installed inside the boom, but the valve maintenance is deteriorated.
Example two:
the embodiment provides a crane, which comprises the single-cylinder bolt telescopic system in the first embodiment.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the invention, "plurality" means two or more unless explicitly specifically defined otherwise.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. The first feature being "under," "beneath," and "under" the second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
In the description herein, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A single-cylinder bolt telescopic system is characterized by comprising a single-cylinder bolt telescopic main system and a cylinder arm pin action control system;
the single-cylinder bolt telescopic main system comprises a telescopic oil cylinder and a telescopic hydraulic system for driving the telescopic oil cylinder; a movable core pipe is not arranged in the telescopic oil cylinder;
the cylinder arm pin action control system comprises a cylinder arm pin mechanism and a cylinder arm pin hydraulic system for driving the cylinder arm pin mechanism to act;
the telescopic hydraulic system and the cylinder arm pin hydraulic system are independent.
2. The single cylinder bolt telescoping system of claim 1, wherein the single cylinder bolt telescoping master system comprises a variable hydraulic pump, a hydraulic control proportional reversing valve, a telescoping cylinder, two electric proportional pressure reducing valves;
the high-pressure oil of the variable hydraulic pump controls the extending and retracting actions of the telescopic oil cylinder through a hydraulic control proportional reversing valve; the two electric proportional pressure reducing valves respectively control the control pressure at two ends of the valve rod of the hydraulic control proportional reversing valve, and the valve rod of the hydraulic control proportional reversing valve can be controlled to move by adjusting the input current of the electric proportional pressure reducing valves.
3. The single cylinder bolt telescoping system of claim 2, wherein the telescoping hydraulic system further comprises a balance valve installed between the pilot operated proportional directional control valve and the telescoping cylinder, one end of the balance valve is connected with a third electro-proportional pressure reducing valve, and the third electro-proportional pressure reducing valve is used for adjusting an opening of the balance valve.
4. The single cylinder pin retraction system according to claim 1, wherein said cylinder arm pin hydraulic system comprises a hydraulic pump, a cylinder arm pin switching valve, a duplex hose, an arm pin cylinder and a cylinder pin cylinder in communication, and an oil tank;
the cylinder arm pin mechanism comprises a return spring, a cylinder pin structure communicated with a cylinder pin oil cylinder and an arm pin mechanism communicated with the arm pin oil cylinder;
the arm pin oil cylinder comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel, the cylinder barrel of the arm pin oil cylinder is fixed, and the inner part of the arm pin oil cylinder is divided into a rodless cavity and a rod cavity;
the cylinder pin oil cylinder comprises a cylinder barrel and an oil cylinder piston rod arranged in the cylinder barrel, the cylinder barrel of the cylinder pin oil cylinder is fixed, and the interior of the cylinder pin oil cylinder is divided into a rodless cavity and a rod cavity;
when the rodless cavity of the cylinder pin oil cylinder moves leftwards during oil inlet, the cylinder pin mechanism is pushed to move leftwards; when oil is returned from the rodless cavity, the cylinder pin oil cylinder and the cylinder pin mechanism are reset under the action of the reset spring;
when the rodless cavity of the arm pin oil cylinder is moved rightwards when oil is fed, the arm pin mechanism is pushed to move rightwards; when oil is returned from the rodless cavity, the arm pin oil cylinder and the arm pin mechanism reset under the action of the reset spring;
the cylinder arm pin switching valve is a three-position four-way switching valve used for realizing the switching of cylinder pin pulling and arm pin pulling actions;
the duplex hose is arranged among the cylinder pin oil cylinder, the arm pin oil cylinder and the three-position four-way valve;
when the left position of the cylinder arm pin switching valve is electrified to work, high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve and the duplex hose to reach a rodless cavity of the arm pin oil cylinder; under the action of hydraulic pressure, a piston rod of the oil cylinder drives the arm pin pulling mechanism to move so as to realize arm pin pulling;
when the arm pin needs to be reset, the switching valve of the cylinder arm pin is powered off, the rodless cavity of the arm pin oil cylinder returns oil, and under the action of the spring force of the reset spring, oil in the rodless cavity of the arm pin oil cylinder flows back to the oil tank;
when the right position of the cylinder arm pin switching valve is electrified to work, high-pressure oil in the hydraulic pump reaches a rodless cavity of the cylinder pin oil cylinder through the cylinder arm pin switching valve, a cylinder barrel of the cylinder pin oil cylinder is fixed, and an oil cylinder piston rod drives the cylinder pin pulling mechanism to act under the action of hydraulic oil pressure to finish the cylinder pin pulling action;
when the cylinder pin oil cylinder is reset, oil in a rodless cavity of the cylinder pin oil cylinder returns through the duplex hose, the cylinder arm pin switching valve is de-energized, the rodless cavity of the cylinder pin oil cylinder returns, and under the spring force action of the reset spring, the oil in the rodless cavity of the cylinder pin oil cylinder flows back to the oil tank.
5. The single cylinder pin retraction system according to claim 4, wherein said cylinder arm pin hydraulic system further comprises a conduit retention mechanism, said conduit retention mechanism comprising:
a guide device which is bypassed by the duplex hose; and
and the elastic device is connected with the guide device and used for driving the guide device to keep the duplex hose in a stretching state when the telescopic oil cylinder performs telescopic action.
6. The single cylinder bolt telescoping system of claim 1, wherein a right ball valve is further disposed between the three-position four-way switching valve and the arm pin cylinder; a left Lu Qiufa is arranged between the three-position four-way switching valve and the cylinder pin oil cylinder;
be equipped with quick-change coupler a between right side way ball valve and the arm round pin hydro-cylinder, be equipped with quick-change coupler b between left side way ball valve and the cylinder round pin hydro-cylinder, be equipped with quick-change coupler e between left side Lu Qiufa and the hydraulic pump, quick-change coupler b and quick-change coupler e directly are equipped with the hose that both ends are connected with quick-change coupler c and quick-change coupler d.
7. The single cylinder latch retraction system according to claim 1, wherein said three-position four-way switching valve is arranged outside the boom.
8. A method for controlling a single cylinder bolt extension system, based on the system of any one of claims 1-7, comprising the steps of:
the requirements of different working conditions of the telescopic system on the telescopic hydraulic system are met by adjusting the current output to the electric proportional valve pressure reducing valve.
9. The single cylinder bolt extension system control method of claim 8, further comprising a cylinder arm pin mechanism actuation method and/or an emergency control method:
the cylinder arm pin mechanism action method comprises the following steps:
the left position of the cylinder arm pin switching valve is electrified to work, and high-pressure oil of the hydraulic pump passes through the cylinder arm pin switching valve and the duplex hose to reach a rodless cavity of the arm pin oil cylinder; under the action of hydraulic pressure, a piston rod of the oil cylinder drives the arm pin pulling mechanism to act so as to pull the arm pin;
when the arm pin needs to be reset, the switching valve of the cylinder arm pin is powered off, the rodless cavity of the arm pin oil cylinder returns oil, and under the action of the spring force of the reset spring, oil in the rodless cavity of the arm pin oil cylinder flows back to the oil tank;
when the right position of the cylinder arm pin switching valve is electrified to work, high-pressure oil in the hydraulic pump reaches a rodless cavity of the cylinder pin oil cylinder through the cylinder arm pin switching valve, a cylinder barrel of the cylinder pin oil cylinder is fixed, and an oil cylinder piston rod drives the cylinder pin pulling mechanism to act under the action of oil hydraulic pressure to finish the cylinder pin pulling action;
when the cylinder pin oil cylinder is reset, oil in a rodless cavity of the cylinder pin oil cylinder returns through the duplex hose, the cylinder arm pin switching valve is de-energized, the rodless cavity of the cylinder pin oil cylinder returns, and under the spring force action of the reset spring, the oil in the rodless cavity of the cylinder pin oil cylinder flows back to the oil tank;
the emergency control method comprises the following steps:
when the cylinder pin needs to be pulled out in an emergency, the left-way ball valve is closed, and the quick-change connector e is in butt joint with the quick-change connector d of the hose; meanwhile, a quick-change connector c at the other end of the hose is connected with a quick-change connector b;
the high-pressure oil of the hydraulic pump is connected with a duplex hose system through an emergency hose;
high-pressure oil enters a rodless cavity of a cylinder pin oil cylinder to complete emergency cylinder pin pulling;
when the arm pin is pulled out in an emergency, the right ball valve is closed, the quick-change connector is externally connected with a high-pressure oil source, and high-pressure oil reaches a rodless cavity of the arm pin oil cylinder, so that the arm pin is pulled out in an emergency.
10. A crane comprising a single cylinder bolt retraction system according to any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795242.9A CN115180513A (en) | 2022-07-07 | 2022-07-07 | Single-cylinder bolt telescopic system, control method and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210795242.9A CN115180513A (en) | 2022-07-07 | 2022-07-07 | Single-cylinder bolt telescopic system, control method and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115180513A true CN115180513A (en) | 2022-10-14 |
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ID=83518333
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210795242.9A Pending CN115180513A (en) | 2022-07-07 | 2022-07-07 | Single-cylinder bolt telescopic system, control method and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115180513A (en) |
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2022
- 2022-07-07 CN CN202210795242.9A patent/CN115180513A/en active Pending
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