CN107235451B - Low-delay starting and inner-leakage-preventing buffer oil cylinder for portal above four levels - Google Patents
Low-delay starting and inner-leakage-preventing buffer oil cylinder for portal above four levels Download PDFInfo
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- CN107235451B CN107235451B CN201710481869.6A CN201710481869A CN107235451B CN 107235451 B CN107235451 B CN 107235451B CN 201710481869 A CN201710481869 A CN 201710481869A CN 107235451 B CN107235451 B CN 107235451B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/08—Masts; Guides; Chains
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
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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
- F15B21/10—Delay devices or arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a low-delay starting and inner leakage preventing buffer oil cylinder for a portal above four levels. The piston rod assembly is characterized in that a conveying oil duct and a piston are arranged in the center of the piston rod assembly, a one-way valve is arranged in the piston, the cylinder barrel assembly is provided with a cylinder bottom, a reversing stop valve is arranged in the cylinder bottom, and an annular gap is formed between the cylinder bottom and the piston. When the oil supply device is used, the oil supply channel firstly supplies oil to the middle cylinder, the middle cylinder is started in advance to drive the sliding frame on the door frame to ascend, when the middle cylinder ascends to the upper end limit position, the oil is supplied to the piston bottom oil cavity of the left rear cylinder through the reversing stop valve, the oil is supplied to the piston bottom oil cavity of the right rear cylinder, the left rear cylinder and the right rear cylinder ascend simultaneously, and the door frame is jacked up again to ascend to reach the preset height. When the portal falls back, the hydraulic oil at the bottom of the piston generates buffering and falls back through the annular gap, and the check valve 4 has the function of draining oil and reducing back pressure when the piston is in sealing failure.
Description
Technical Field
The invention relates to a forklift design technology, in particular to a low-delay starting and inner leakage preventing buffer oil cylinder for a portal above four levels.
Background
In the current stage, when the lifting height of a forklift gantry is required to be more than six meters in some special industries, the height of the forklift gantry is lower than the height of a container door, so that goods can be taken out, and the forklift gantry is taken out of the container for overhead warehouse stacking. In order to meet the requirements, the fully-free portal frame which is higher than the three-level fully-free portal frame in lifting and is more than four levels and lower in height is developed.
The gantry needs a high lifting height, and the total length of the gantries at all levels needs to meet the requirement of entering the box. Therefore, the mounting distance of the rear side oil cylinder (hereinafter referred to as a rear cylinder) is extremely limited, which means that the total length of the oil cylinder design and the internal structure design space are limited. But because the situation that the portal is suitable for of more than four levels is very high to its stability of motion and travelling comfort's requirement, so must be furnished with decline buffer function when the hydro-cylinder design, reduce and descend the impact. Secondly, the lifting process is required, and when the middle cylinder (or called front cylinder) is lifted to the position and the rear cylinder is switched to work, the switching impact (the shaking of the door frame is easily caused) can not exist. Thirdly, due to the influence of the motion relation of the door frames above four levels, the oil circuit connected with the middle cylinder is realized by designing a central oil channel hole on the piston rod of the rear cylinder at one side. Finally, in order to prevent the oil cylinder from being incapable of reaching the maximum stroke caused by internal leakage, the oil cylinder needs a self internal leakage prevention function.
This requires the following technical features of the rear cylinder: (1) a device having a descent buffer function; (2) a device with a low-delay starting function; (3) the piston rod is of a hollow structure; and (4) an inner leakage preventing device is provided.
Disclosure of Invention
The invention mainly aims to solve the problems and provides a low-delay starting and inner leakage preventing buffer oil cylinder for a portal with more than four stages.
The utility model provides a low time delay starts and leak in preventing buffer cylinder for portal more than level four, is equipped with left back jar, well jar 101 and right back jar 102 on the fork truck portal, and these three hydro-cylinders start the portal and rise and the part that descends, low time delay starts and leak in preventing buffer cylinder is left back jar, including piston rod assembly 1, cylinder cap 2, cylinder assembly 3, 3 one end of cylinder assembly is equipped with the oil inlet, and other end installation cylinder cap 2, piston rod assembly 1 is installed in cylinder assembly 3, stretches out the acting through 2 holes of cylinder cap.
The center of the piston rod assembly 1 is provided with a conveying oil duct 7 and a piston 13, a one-way valve 4 is arranged in the piston 13, the cylinder barrel assembly 3 is provided with a cylinder bottom 32, and a reversing stop valve is arranged in the cylinder bottom 32; an annular gap 8 is arranged between the cylinder bottom 32 and the piston 13.
When the oil supply device is used, the oil supply channel 7 firstly supplies oil to the middle cylinder 101, the middle cylinder 101 is started in advance to drive the sliding frame on the door frame to ascend, when the middle cylinder 101 ascends to the upper end limit position, the oil is supplied to the bottom oil cavity of the piston 13 of the left rear cylinder through the reversing stop valve, the oil is supplied to the bottom oil cavity of the piston of the right rear cylinder 102, the left rear cylinder and the right rear cylinder 102 ascend simultaneously, and the door frame is jacked up again to ascend to reach the preset height. When the portal falls back, hydraulic oil at the bottom of the piston 13 generates buffering falling back through the annular gap 8, and the check valve 4 has the function of draining oil and reducing back pressure when the piston fails in sealing.
The technical scheme for further limiting is as follows:
the piston rod assembly 1 comprises a connecting rod 11, an outer connecting steel pipe 12, a piston 13, a front joint 14, an inner connecting steel pipe 15 and a rear joint 16; the front joint 14 and the rear joint 16 are both provided with a central through hole. The front end of the inner connecting steel pipe 15 is connected with a front joint 14, the rear end of the inner connecting steel pipe is connected with a rear joint 16, the front joint 14 is connected with the rear end of a central oil passage hole of the connecting rod 11, the rear joint 16 is connected with the front end of a central oil passage hole of the piston 13, the front end of the outer connecting steel pipe 12 is connected with the outer circle of the rear end of the connecting rod 11, and the rear end of the outer connecting steel pipe 12 is connected with the outer circle of the front end of the piston 13.
The piston 13 is a two-stage step cylinder structure composed of a thick cylinder and a thin cylinder, the center of the piston extends to the axial position, a first-stage round hole 131 is formed in the end of the thick cylinder, a second-stage round hole 133 is formed in the end of the thin cylinder, and a middle round hole 132 is formed between the first-stage round hole 131 and the second-stage round hole 133. The thick cylinder is provided with a first ring groove 137 and a second ring groove 138. Be equipped with check valve mounting hole 134 on the thick cylinder, be equipped with oil groove 136 on the thin cylinder excircle, be equipped with intercommunicating pore 135 between oil groove 136 and the check valve oilhole 134.
The first ring groove 137 and the second ring groove 138 are provided with a sealing ring and a supporting ring.
The cylinder barrel assembly 3 comprises a cylinder barrel 31 and a cylinder bottom 32, the cylinder barrel 31 is a steel pipe with an inner hole processed through precision machining, an inner pipe thread is arranged in the inner hole at one end of the cylinder barrel 31, and the inner pipe thread is matched with an outer pipe thread on the cylinder cover 2. The cylinder bottom 32 is provided with a positioning circular shaft shoulder 321, a buffer cylinder 322, an oil inlet 323, an internal threaded hole 324, a lower oil passage 325, a side oil passage 326, a main oil passage 327, a first mounting hole 328 and a second mounting hole 329. The locating circular shaft shoulder 321 is connected with the other end of the cylinder barrel 31 in a matched mode, a welding groove is formed in the excircle of the joint, the buffering cylinder 322 is coaxially connected with the locating circular shaft shoulder 321, and a main oil gallery 327 is arranged in the buffering cylinder 322. An oil inlet 323 is arranged in the vertical direction of the main oil channel 327, an internal threaded hole 324 is arranged at the bottom of the oil inlet 323, the internal threaded hole 324 is connected with a lower oil channel 325 in a penetrating manner, and the lower oil channel 325 is connected with a side oil channel 326 on the side surface in a penetrating manner; the first mounting hole 328 and the second mounting hole 329 are arranged on the end face of the side face of the oil inlet 323 and are used for mounting the oil cylinder on a door frame.
The reversing stop valve comprises a valve core 5 and a valve seat 6. The valve core 5 is a cylinder with a conical surface at one end, a central oil duct 51 is arranged at the center, a ring groove 52 is arranged on the excircle of the valve core 5, and the central oil duct 51 is communicated with the ring groove 52 through a communicating oil duct 53. The valve spool 5 is installed in the lower oil passage 325.
The valve seat 6 is a cylinder, a central hole 61 is formed in the center of the valve seat, two process holes 63 are formed in two sides of the central hole 61, external threads 62 are formed in the outer circle of the valve seat 6, and the valve seat 6 is screwed on the internal thread holes 324 through the process holes 63 by using a special wrench.
The excircle of the buffer cylinder 322 is in clearance fit with the first-stage round hole 131 on the piston 13, and the clearance fit forms an annular gap 8.
The axial center of the connecting rod 11 is provided with a front oil duct 111, the side surface of the front end of the connecting rod 11 is provided with an oil outlet 112, the oil outlet 112 is communicated with the front oil duct 111, and hydraulic oil is conveyed into the middle cylinder 10 through the oil outlet.
An outer oil cavity is formed between the cylinder barrel 31 and the outer connecting steel pipe 12, an inner oil cavity is formed between the connecting steel pipe 12 and the inner connecting steel pipe 15, and the outer oil cavity and the inner oil cavity are in through connection through the oil groove 136.
The conveying oil duct 7 is composed of a front oil duct 111 in the connecting rod 11, central through holes of the front joint 14 and the rear joint 16, and an inner hole of the inner connecting steel pipe 15.
The beneficial technical effects of the invention are as follows:
(1) The descending adopts the gap throttling buffering, and the buffering structure is simple.
(2) The auxiliary one-way oil way is arranged, and the starting delay of the oil cylinder is reduced.
(3) The piston is embedded with a one-way valve to prevent internal leakage and prolong the service life.
(4) The steel pipe nested in the piston rod is filled with oil, so that the use amount of hydraulic oil is reduced, and the weight of the oil cylinder is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic view of a piston rod assembly according to the present invention.
FIG. 3 is a schematic view of a cylinder assembly of the present invention.
Fig. 4 is a schematic view of the piston of the present invention.
FIG. 5 is a schematic view of the bottom of the cylinder of the present invention.
Fig. 6 is a schematic view of the valve cartridge of the present invention.
FIG. 7 is a schematic view of a valve seat according to the present invention.
FIG. 8 is a schematic view of the present invention in use.
Sequence numbers in the figure:
the hydraulic oil cylinder comprises a piston rod assembly 1, a connecting rod 11, a front oil duct 111, an oil outlet 112, an outer connecting steel pipe 12, a piston 13, a primary round hole 131, a middle round hole 132, a secondary round hole 133, a one-way valve oil hole 134, a communicating hole 135, an oil groove 136, a first ring groove 137, a second ring groove 138, a front joint 14, an inner connecting steel pipe 15 and a rear joint 16;
the cylinder cover 2, the cylinder assembly 3, the cylinder 31, the cylinder bottom 32, the positioning circular shaft shoulder 321, the buffer cylinder 322, the oil inlet 323, the internal thread hole 324, the lower oil duct 325, the side oil duct 326, the main oil duct 327, the first mounting hole 328, the second mounting hole 329, the check valve 4, the valve core 5, the central oil duct 51, the annular groove 52, the communicating oil duct 53, the valve seat 6, the central hole 61, the external thread 62, the process hole 63, the conveying oil duct 7, the annular gap 8, the door frame 9, the middle cylinder 101 and the right rear cylinder 102.
Detailed Description
The invention will be further described by way of example with reference to the accompanying drawings.
Examples
Referring to fig. 1, a low-delay starting and inner leakage preventing buffer oil cylinder for a portal above four levels comprises a piston rod assembly 1, a cylinder cover 2, a cylinder barrel assembly 3, a one-way valve 4 and a reversing stop valve. An oil inlet is formed in one end of the cylinder barrel assembly 3, the cylinder cover 2 is installed at the other end of the cylinder barrel assembly, and the piston rod assembly 1 is installed in the cylinder barrel assembly 3 and stretches out to do work through an inner hole of the cylinder cover 2.
Referring to fig. 2, the piston rod assembly 1 includes a connecting rod 11, an outer connecting steel tube 12, a piston 13, a front joint 14, an inner connecting steel tube 15 and a rear joint 16; the front joint 14 and the rear joint 16 are both provided with a central through hole. The front end of in-connection steel pipe 15 connects front joint 14, and the rear end connects rear joint 16, front joint 14 is connected with connecting rod 11 central oil duct hole rear end, rear joint 16 is connected with the front end in the central oil duct hole of piston 13, the front end and the connecting rod 11 rear end excircle of outer joint steel pipe 12 are connected, the rear end and the front end excircle of piston 13 of outer joint steel pipe 12 are connected. The axial center of the connecting rod 11 is provided with a front oil duct 111, the side surface of the front end of the connecting rod 11 is provided with an oil outlet 112, the oil outlet 112 is communicated with the front oil duct 111, and hydraulic oil is conveyed into the middle cylinder 10 through the oil outlet.
Referring to fig. 4, the piston 13 is a two-stage stepped cylinder structure composed of a thick cylinder and a thin cylinder, the center of the two-stage stepped cylinder structure extends in the axial direction, a first-stage circular hole 131 is formed at the end of the thick cylinder, a second-stage circular hole 133 is formed at the end of the thin cylinder, and a middle circular hole 132 is formed between the first-stage circular hole 131 and the second-stage circular hole 133. The thick cylinder is provided with a first ring groove 137 and a second ring groove 138. The thick cylinder is provided with a check valve oil hole 134, the outer circle of the thin cylinder is provided with an oil groove 136, and a communicating hole 135 is arranged between the oil groove 136 and the check valve mounting hole 134. The first ring groove 137 and the second ring groove 138 are provided with a sealing ring and a supporting ring.
Referring to fig. 3 and 5, the cylinder barrel assembly 3 includes a cylinder barrel 31 and a cylinder bottom 32, the cylinder barrel 31 is a steel pipe with an inner hole processed by precision machining, an inner pipe thread is arranged in the inner hole at one end of the cylinder barrel 31, and the inner pipe thread is in threaded fit with an outer pipe thread on the cylinder head 2. The cylinder bottom 32 is provided with a positioning circular shaft shoulder 321, a buffer cylinder 322, an oil inlet 323, an internal thread hole 324, a lower oil channel 325, a side oil channel 326, a main oil channel 327, a first mounting hole 328 and a second mounting hole 329. The locating circular shaft shoulder 321 is connected with the other end of the cylinder barrel 31 in a matched mode, a welding groove is formed in the excircle of the joint, the buffering cylinder 322 is coaxially connected with the locating circular shaft shoulder 321, and a main oil gallery 327 is arranged in the buffering cylinder 322. The excircle of the buffer cylinder 322 is in clearance fit with the first-stage round hole 131 on the piston 13, and the clearance fit forms an annular gap 8.
An oil inlet 323 is arranged in the vertical direction of the main oil passage 327, an internal threaded hole 324 is arranged at the bottom of the oil inlet 323, the internal threaded hole 324 is connected with a lower oil passage 325 in a penetrating manner, and the lower oil passage 325 is connected with a side oil passage 326 on the side face in a penetrating manner. The first mounting hole 328 and the second mounting hole 329 are arranged on the end face of the side face of the oil inlet 323 and are used for mounting the oil cylinder on a gantry.
Referring to fig. 6 and 7, the direction change shutoff valve includes a valve element 5 and a valve seat 6. The valve core 5 is a cylinder with a conical surface at one end, a central oil duct 51 is arranged at the center, a ring groove 52 is arranged on the excircle of the valve core 5, and the central oil duct 51 is communicated with the ring groove 52 through a communicating oil duct 53; the valve spool 5 is installed in the lower oil passage 325.
The valve seat 6 is a cylinder, a central hole 61 is formed in the center of the valve seat, two process holes 63 are formed in two sides of the central hole 61, external threads 62 are formed in the outer circle of the valve seat 6, and the valve seat 6 is screwed on the internal thread holes 324 through the process holes 63 by using a special wrench.
Referring to fig. 8, in use, the oil conveying channel 7 firstly supplies oil to the middle cylinder 10 through the oil outlet 112, the middle cylinder 101 is firstly started to drive the carriage on the mast to ascend, when the middle cylinder 101 ascends to the upper end limit position, the oil is supplied to the bottom oil cavity of the piston 13 of the left rear cylinder through the reversing stop valve, the oil is supplied to the bottom oil cavity of the piston of the right rear cylinder 102, and the left rear cylinder and the right rear cylinder 102 ascend simultaneously and jack up the mast 9 again to ascend to a preset height. When the portal falls back, hydraulic oil at the bottom of the piston 13 generates buffering falling back through the annular gap 8, and the check valve 4 has the function of draining oil and reducing back pressure when the piston fails in sealing.
Specifically, the method comprises the following steps:
(1) The lifting process of the door frame 9 is as follows:
firstly, hydraulic oil enters from an oil inlet 323 of the cylinder bottom 32 and enters an oil path of the middle cylinder 101 through the oil conveying passage 7, so that the middle cylinder 10 acts firstly. When the middle cylinder 101 is lifted to the right, hydraulic oil enters the lower oil duct 325 through the central hole 61 of the valve seat 6 and pushes the valve core 5 to move towards the bottom of the lower oil duct 325, the annular groove 52 on the valve core 5 is communicated with the side oil duct 326, at the moment, the hydraulic oil directly enters the bottom of the piston 13, namely the lower cavity of the left rear cylinder, pressure is quickly built, low-delay starting of the left rear cylinder is achieved, and finally the purpose that the middle cylinder 101, the left rear cylinder and the right rear cylinder 102 are smoothly switched in action is achieved.
(2) Descending process of the door frame 9:
when the piston rod assembly 1 descends until the first-stage circular hole 131 of the piston 13 is not sleeved with the buffering cylinder 322 of the cylinder bottom 32, the hydraulic oil directly flows back to the hydraulic system of the forklift through the main oil passage 327 and the oil inlet 323 of the cylinder bottom 32.
When the piston rod assembly 1 descends to a position where the first-stage round hole 131 on the piston 13 is sleeved with the buffer cylinder 322 of the cylinder bottom 32, the annular gap 8 formed by the sleeving can cause throttling action, and at the moment, oil can only flow back from the side oil passage 326 of the cylinder bottom 32. Because the descending speed is faster than the ascending speed, when the oil passes through the communicating oil duct 53 on the valve core 5, the instant throttling generates a large pressure difference, so that the oil pushes the valve core 5 to move to the upper part of the lower oil duct 325, and the annular groove 52 and the communicating oil duct 53 on the valve core 5 are completely cut off. So that the oil can only flow back through the annular gap 8, the lower cavity of the left rear cylinder generates great back pressure due to continuous throttling of the annular gap 8, and finally the piston rod assembly 1 descends in a speed reducing mode under the action of the back pressure to form a descending buffering function.
(3) Internal leakage of the oil cylinder:
when the left rear cylinder leaks due to the sealing failure at the piston 13 and the rear joint 16, the hydraulic oil in the lower cavity continuously leaks to the upper cavity of the left rear cylinder or the piston rod cavity. If the oil cylinder rises under a certain working pressure lower than the full load pressure, when the oil liquid rising to the upper cavity forms a limit, the acting area of the front end face of the piston 13 is far smaller than that of the rear end face, so that the pressure generated by the oil liquid leaking to the upper cavity is far larger than that of the lower cavity, the check valve 4 is opened under the pressure action of the upper cavity to discharge the oil liquid to the lower cavity, and the effect of preventing the internal leakage per se is finally realized.
The above description is not intended to limit the present invention in any way as to its structure and shape. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A low-delay starting and inner leakage preventing buffer oil cylinder for a portal frame with more than four stages is characterized in that a fork truck portal frame is provided with a left rear cylinder, a middle cylinder (101) and a right rear cylinder (102), the three oil cylinders are main parts for starting the rise and the fall of the portal frame, the low-delay starting and inner leakage preventing buffer oil cylinder is the left rear cylinder and comprises a piston rod assembly (1), a cylinder cover (2) and a cylinder barrel assembly (3), one end of the cylinder barrel assembly (3) is provided with an oil inlet, the other end of the cylinder barrel assembly is provided with the cylinder cover (2), the piston rod assembly (1) is arranged in the cylinder barrel assembly (3), and the piston rod assembly extends out of an inner hole of the cylinder cover (2) to do work; the method is characterized in that: the center of the piston rod assembly (1) is provided with a conveying oil duct (7) and a piston (13), a one-way valve (4) is arranged in the piston (13), the cylinder barrel assembly (3) is provided with a cylinder bottom (32), and a reversing stop valve is arranged in the cylinder bottom (32); an annular gap (8) is arranged between the cylinder bottom (32) and the piston (13);
when the oil supply device is used, the oil supply channel (7) firstly supplies oil to the middle cylinder (101), the middle cylinder (101) is started in advance to drive the sliding frame on the portal frame to ascend, when the middle cylinder (101) ascends to the upper end limit position, the oil is supplied to the bottom oil cavity of the piston (13) of the left rear cylinder through the reversing stop valve, the oil is supplied to the bottom oil cavity of the piston of the right rear cylinder (102), the left rear cylinder and the right rear cylinder (102) ascend simultaneously, and the portal frame is jacked up again to ascend to reach the preset height; when the portal falls back, the hydraulic oil at the bottom of the piston (13) generates buffering and falls back through the annular gap (8), and the check valve (4) has the function of draining oil and reducing back pressure when the piston is in sealing failure.
2. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal above four levels as claimed in claim 1, wherein: the piston rod assembly (1) comprises a connecting rod (11), an external connecting steel pipe (12), a piston (13), a front joint (14), an internal connecting steel pipe (15) and a rear joint (16); the front joint (14) and the rear joint (16) are both provided with a central through hole; connect preceding joint (14) before the front end of in-connection steel pipe (15), rear end connection rear joint (16), preceding joint (14) are connected with connecting rod (11) central oil duct hole rear end, rear joint (16) are connected with the front end in the central oil duct hole of piston (13), the front end and the connecting rod (11) rear end excircle of outer joint steel pipe (12) are connected, the rear end of outer joint steel pipe (12) is connected with the front end excircle of piston (13).
3. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal above four levels as claimed in claim 1, wherein: the piston (13) is of a two-stage step cylinder structure consisting of a thick cylinder and a thin cylinder, the center of the piston extends to the axial position, a first-stage round hole (131) is formed in the end of the thick cylinder, a second-stage round hole (133) is formed in the end of the thin cylinder, and a middle round hole (132) is formed between the first-stage round hole (131) and the second-stage round hole (133); the thick cylinder is provided with a first ring groove (137) and a second ring groove (138); be equipped with check valve oilhole (134) on the thick cylinder, be equipped with oil groove (136) on the thin cylinder excircle and extend to the preceding terminal surface of thick cylinder, be equipped with intercommunicating pore (135) between oil groove (136) and check valve oilhole (134).
4. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal above four levels as claimed in claim 3, wherein: and a sealing ring and a supporting ring are arranged on the first annular groove (137) and the second annular groove (138).
5. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal above four levels as claimed in claim 1, wherein: the cylinder barrel assembly (3) comprises a cylinder barrel (31) and a cylinder bottom (32), the cylinder barrel (31) is a steel pipe with an inner hole subjected to precision machining, an inner pipe thread is arranged in the inner hole at one end of the cylinder barrel (31), and the inner pipe thread is matched with an outer pipe thread on the cylinder cover (2); the cylinder bottom (32) is provided with a positioning round shaft shoulder (321), a buffering cylinder (322), an oil inlet (323), an internal threaded hole (324), a lower oil duct (325), a side oil duct (326), a main oil duct (327), a first mounting hole (328) and a second mounting hole (329); the positioning circular shaft shoulder (321) is connected with the other end of the cylinder barrel (31) in a matched mode, a welding groove is formed in the outer circle of the connecting position, the buffering cylinder (322) is coaxially connected with the positioning circular shaft shoulder (321), and a main oil duct (327) is arranged in the buffering cylinder (322); an oil inlet (323) is arranged in the vertical direction of the main oil passage (327), an internal threaded hole (324) is formed in the bottom of the oil inlet (323), the internal threaded hole (324) is communicated with a lower oil passage (325), and the lower oil passage (325) is communicated with a side oil passage (326) on the side surface; the first mounting hole (328) and the second mounting hole (329) are arranged on the end face of the side face of the oil inlet (323) and used for mounting the oil cylinder on the door frame.
6. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal frame with more than four stages as claimed in claim 5, characterized in that: the reversing stop valve comprises a valve core (5) and a valve seat (6);
the valve core (5) is a cylinder with a conical surface at one end, a central oil duct (51) is arranged at the center, a ring groove (52) is arranged on the excircle of the valve core (5), and the central oil duct (51) is communicated with the ring groove (52) through a communicating oil duct (53); the valve core (5) is arranged in the lower oil duct (325); the valve seat (6) is a cylinder, a center hole (61) is formed in the center of the valve seat, two process holes (63) are formed in the two sides of the center hole (61), external threads (62) are formed in the outer circle of the valve seat (6), and a special wrench is utilized to screw the valve seat (6) on the internal thread holes (324) through the process holes (63).
7. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal frame with more than four stages as claimed in claim 5, characterized in that: the excircle of the buffer cylinder (322) is in clearance fit with the first-stage round hole (131) on the piston (13), and the clearance fit forms an annular gap (8).
8. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal above four levels as claimed in claim 2, wherein: connecting rod (11) axial direction central point puts and is equipped with front oil duct (111), the front end lateral surface of connecting rod (11) is equipped with oil-out (112), oil-out (112) and front oil duct (111) through connection to carry hydraulic oil in well jar (101) through the oil-out.
9. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal frame with more than four stages as claimed in claim 3, characterized in that: an outer oil cavity is formed between the cylinder barrel (31) and the outer connecting steel pipe (12), an inner oil cavity is formed between the outer connecting steel pipe (12) and the inner connecting steel pipe (15), and the outer oil cavity is communicated with the inner oil cavity through the oil groove (136).
10. The low-delay starting and inner leakage preventing buffer oil cylinder for the portal above four levels as claimed in claim 2, wherein: the conveying oil duct (7) consists of a front oil duct (111) in the connecting rod (11), a central through hole of the front joint (14) and the rear joint (16), and an inner hole of the inner connecting steel pipe (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710481869.6A CN107235451B (en) | 2017-06-22 | 2017-06-22 | Low-delay starting and inner-leakage-preventing buffer oil cylinder for portal above four levels |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710481869.6A CN107235451B (en) | 2017-06-22 | 2017-06-22 | Low-delay starting and inner-leakage-preventing buffer oil cylinder for portal above four levels |
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| CN107235451A CN107235451A (en) | 2017-10-10 |
| CN107235451B true CN107235451B (en) | 2023-02-24 |
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| CN201710481869.6A Active CN107235451B (en) | 2017-06-22 | 2017-06-22 | Low-delay starting and inner-leakage-preventing buffer oil cylinder for portal above four levels |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108457930A (en) * | 2018-04-08 | 2018-08-28 | 中国重汽集团南充海乐机械有限公司 | A kind of automobile-used single-acting piston type multistage synchronous fuel tank of disabled's boarding |
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