CN110683484A - Vibration damper for telescopic arm forklift - Google Patents
Vibration damper for telescopic arm forklift Download PDFInfo
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- CN110683484A CN110683484A CN201910966814.3A CN201910966814A CN110683484A CN 110683484 A CN110683484 A CN 110683484A CN 201910966814 A CN201910966814 A CN 201910966814A CN 110683484 A CN110683484 A CN 110683484A
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- flow
- hole
- oil port
- valve core
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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
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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
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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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- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/021—Installations or systems with accumulators used for damping
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
Abstract
The invention relates to a vibration damper for a telescopic arm forklift, which comprises a valve body, wherein a first oil port, a second oil port, a third oil port, a fourth oil port, a first mounting hole, a second mounting hole and a third mounting hole are formed in the valve body; the valve core is arranged in the second mounting hole, and a first damping channel and a second damping channel are arranged in the valve core; the first one-way damping valve is arranged in the first damping channel; a first spring; an overflow valve assembly; a two-position three-way electromagnetic directional valve; a valve assembly is manually shut off. The damping device for the telescopic arm forklift is simple in structure and compact in size, can realize damping control on the telescopic arm forklift during running, and is convenient to maintain.
Description
Technical Field
The invention belongs to the technical field of vibration dampers, and particularly relates to a vibration damper for a telescopic arm forklift.
Background
The wheel edge support of the telescopic arm forklift is rigidly connected with the frame, and the excitation vibration caused by uneven road surface is completely borne by four tires. When the telescopic boom forklift runs or works, the movable arm oil cylinder does not act, the movable arm oil cylinder and the front frame are similar to rigid connection at the moment, the whole forklift swings with the front axle as the center due to road conditions and tires, the situation that the rear axle is separated from the ground sometimes can be caused, a driver swings with the whole forklift at the moment, the control is difficult, and the driving comfort is poor. Because the working device, heavy objects and other parts of the machine body react to bumpy bottom surfaces or obstacles, strong vibration and impact are generated, and the smoothness and the stability of the running of the whole machine are seriously influenced. These influences can cause the structures such as equipment and frame to produce fatigue damage, and the travelling comfort of vehicle worsens, causes personnel's fatigue of driving easily, and serious can cause the damage, has also restricted the speed of traveling when long distance transition operation simultaneously, has reduced the efficiency of fuel economy and operation.
Disclosure of Invention
The invention aims to provide a damping device of a telescopic arm forklift, which has the advantages of simple structure, compact volume and low manufacturing cost, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a damping device for telescopic boom fork truck which characterized in that: the valve body is internally provided with a valve body through hole which penetrates along the axial direction, the valve body through hole comprises a first mounting hole, a communicating hole and a second mounting hole from top to bottom, a third mounting hole is also arranged in the valve body, a first oil port, a second oil port and a third oil port which are communicated with the second mounting hole are arranged on the side wall of the valve body at intervals, and a fourth oil port is formed by a lower opening of the second mounting hole;
the valve core is arranged in the second mounting hole in a vertically sliding manner, a first convex shoulder, a second convex shoulder, a third convex shoulder, a fourth convex shoulder and a fifth convex shoulder are arranged on the valve core at intervals from top to bottom, a first through flow groove is formed between the first convex shoulder and the second convex shoulder, a second through flow groove is formed between the second convex shoulder and the third convex shoulder, a third through flow groove is formed between the third convex shoulder and the fourth convex shoulder, a fourth through flow groove is formed between the fourth convex shoulder and the fifth convex shoulder, a control cavity is formed between the upper end surface of the valve core and the bottom surface of the second mounting hole, a first through flow hole with a downward opening is arranged in the valve core, the first through flow groove is communicated with a fourth oil port, a second through flow hole for communicating the fourth through flow groove and the first through flow groove is arranged on the side wall of the valve core, a first damping channel and a second damping channel for communicating the second through flow groove and the third through flow groove are, an installation cavity with an upward opening is arranged in the valve core, and a third through-flow hole for communicating the installation cavity with the first through-flow groove and a fourth through-flow hole for communicating the installation cavity with the second through-flow groove are formed in the side wall of the valve core;
the first one-way damping valve is arranged in the first damping channel, and oil can only flow into the second through-flow channel from the third through-flow channel through the first one-way damping valve and is reversely stopped and not communicated;
the second one-way damping valve is arranged in the second damping channel, and oil can only flow into the third flow through groove from the second flow through groove through the second one-way damping valve and is reversely stopped and not communicated;
the plug is fixedly connected to the lower end of the second mounting hole, and a plug through hole penetrating along the axial direction is formed in the plug;
the first spring is arranged in the second mounting hole, one end of the first spring is abutted against the plug, and the other end of the first spring is abutted against the valve core to keep the trend of upward movement of the valve core;
the overflow valve assembly is arranged in the mounting cavity and used for controlling the on-off of the third through-flow hole and the fourth through-flow hole, and when the pressure of the fourth through-flow hole is greater than the set pressure of the overflow valve assembly, the overflow valve assembly is opened, so that oil flows into the third through-flow hole through the fourth through-flow hole;
the two-position three-way electromagnetic reversing valve is fixedly arranged in the first mounting hole, a first interface, a second interface and a third interface are arranged on the two-position three-way electromagnetic reversing valve, the first interface is communicated with the first oil port, the second interface is communicated with the fourth oil port, the third interface is communicated with the control cavity, when the two-position three-way electromagnetic reversing valve is not electrified, the second interface is communicated with the third interface, the first interface is blocked and cannot be communicated, and when the two-position three-way electromagnetic reversing valve is electrified, the first interface is communicated with the third interface, and the second interface is blocked and cannot be communicated;
the manual stop valve assembly is arranged in the third mounting hole and used for controlling the connection and disconnection of the first oil port and the fourth oil port;
wherein the spool is switchable between a first position and a second position.
Preferably, the differential pressure compensator further comprises a first spring seat and a second spring seat, the first spring seat and the second spring seat are located in the third valve sleeve through hole section, the compensating spring is located between the first spring seat and the second spring seat, the upper end of the compensating spring abuts against the first spring seat, the lower end of the compensating spring abuts against the second spring seat, the upper end of the first spring seat abuts against the lower end of the differential pressure compensating valve core, a fifth through hole penetrating along the axial direction is formed in the first spring seat, and a sixth through hole penetrating along the axial direction is formed in the second spring seat.
Preferably, when the valve core is located at the first position, the third shoulder blocks the first oil port and the second oil port, the fourth shoulder blocks the third oil port, and the first oil port, the second oil port, the third oil port and the fourth oil port are not communicated in pairs; when the valve core is located at the second position, the first oil port is communicated with the second oil port through the second through-flow groove, and the third oil port is communicated with the fourth oil port through the fourth through-flow groove.
Preferably, a first flow passage for communicating the first connector and the first oil port and a second flow passage for communicating the second connector and the fourth oil port are arranged in the valve body, a third flow passage for communicating the first through flow passage and the second flow passage is arranged in the valve body, the lower end of the third mounting hole is communicated with the second flow passage, and the middle of the third mounting hole is communicated with the first flow passage.
Preferably, the first one-way damping valve comprises a first steel ball, a second spring and a first damper, the first steel ball can slide left and right in the first damping channel, the first damper is fixedly connected in the first damping channel, a first damping hole is formed in the first damper, one end of the second spring abuts against the first damper, and the other end of the second spring abuts against the first steel ball, so that the first steel ball keeps the tendency of separating the communication between the first through flow groove and the second through flow groove.
Preferably, the second one-way damping valve comprises a second steel ball, a third spring and a second damper, the second steel ball can slide left and right in the second damping channel, the second damper is fixedly connected in the second damping channel, a second damping hole is formed in the second damper, one end of the third spring abuts against the second damper, the other end of the third spring abuts against the second steel ball, the trend that the second steel ball separates the communication between the first through flow groove and the second through flow groove is kept, and the diameter of the second damping hole is smaller than that of the first damping hole.
Preferably, the overflow valve assembly comprises an overflow valve core, an overflow spring and a plug, the overflow valve core is arranged in the mounting cavity in a vertically sliding manner, the plug is fixedly connected to the upper end of the mounting cavity, one end of the overflow spring abuts against the plug, and the other end of the overflow spring abuts against the overflow valve core, so that the overflow valve core keeps moving downwards to block the tendency that the third through hole is communicated with the fourth through hole.
Preferably, the manual stop valve assembly comprises a stop valve core, a return spring, a threaded sleeve and a button, the threaded sleeve is fixedly connected to the third mounting hole, the stop valve core is arranged in the third mounting hole in a vertically sliding mode and penetrates through an inner hole of the threaded sleeve to extend to the upper portion of the threaded sleeve, the button is fixedly connected to the upper end of the stop valve core, one end of the return spring abuts against the threaded sleeve, the other end of the return spring abuts against the stop valve core, and the stop valve core is enabled to keep moving downwards to block the trend that the second flow channel is communicated with the first flow channel.
Compared with the prior art, the invention has the advantages that:
when the multi-way reversing valve is used, the first oil port is connected with the energy accumulator, the first oil port and the third oil port are respectively connected with two working oil ports of a multi-way reversing valve used for controlling a movable arm oil cylinder on a telescopic arm forklift, the fourth oil port is connected with an oil tank, when the two-position three-way electromagnetic reversing valve is not electrified, the valve core works at the first position, the effect that when the multi-way reversing valve controls the brake arm oil cylinder to work, liquid is automatically filled into the energy accumulator through the first one-way damping valve, and the highest pressure of the energy accumulator can be limited through the overflow valve assembly can be realized; when the telescopic boom forklift runs at a high speed, the two-position three-way electromagnetic directional valve is electrified, the valve core is switched to the second position, the energy accumulator is communicated with the rodless cavity of the boom cylinder through the first oil port and the second oil port, the rod cavity of the boom cylinder is communicated with the fourth oil port through the third oil port, the vibration of the boom cylinder can be buffered through the energy accumulator, the floating connection is realized, and the vibration reduction is realized; when a fault occurs and maintenance is required, the pressure of the energy accumulator can be unloaded by operating the manual stop valve assembly. The invention has simple structure and compact volume, can realize the vibration damping control of the telescopic arm forklift and is convenient to maintain.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a valve body according to an embodiment of the present invention;
FIG. 3 is a schematic view of a valve core structure according to an embodiment of the present invention;
fig. 4 is a schematic view of a hydraulic principle applied in the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1-4, is a preferred embodiment of the present invention.
A vibration damper for a telescopic boom forklift, comprising
The valve body 1 is provided with a valve body through hole penetrating along the axial direction in the valve body 1, the valve body through hole comprises a first mounting hole 102, a communicating hole 104 and a second mounting hole 101 from top to bottom, a third mounting hole 103 is further arranged in the valve body 1, a first oil port X, a second oil port A and a third oil port B which are communicated with the second mounting hole 101 are arranged on the side wall of the valve body 1 at intervals, a lower opening of the second mounting hole 101 forms a fourth oil port T, a first flow channel 105 for communicating the first interface 51 with the first oil port X and a second flow channel 106 for communicating the second interface 52 with the fourth oil port T are arranged in the valve body 1, a third flow channel 107 for communicating the first through flow groove 2a with the second flow channel 106 is arranged in the valve body 1, the lower end of the third mounting hole 103 is communicated with the second flow channel 106, and the middle of the third mounting hole 103 is communicated with the first flow channel 105.
The valve core 2 is arranged in the second mounting hole 101 in a vertically sliding manner, a first shoulder 20, a second shoulder 21, a third shoulder 22, a fourth shoulder 23 and a fifth shoulder 24 are arranged on the valve core 2 at intervals from top to bottom, a first through flow groove 2a is formed between the first shoulder 20 and the second shoulder 21, a second through flow groove 2b is formed between the second shoulder 21 and the third shoulder 22, a third through flow groove 2c is formed between the third shoulder 22 and the fourth shoulder 23, a fourth through flow groove 2d is formed between the fourth shoulder 23 and the fifth shoulder 24, a control cavity 1a is formed between the upper end surface of the valve core 2 and the bottom surface of the second mounting hole 101, a first through flow hole 25 with a downward opening is arranged in the valve core 2, the first through flow groove 2a is communicated with the fourth T, a second through flow hole 28 for communicating the fourth through flow groove 2d with the first through flow hole 25 is arranged on the side wall of the valve core 2, the valve core 2 is internally provided with a first damping channel 26 and a second damping channel 27 which are connected in parallel and used for communicating the second through flow groove 2b and the third through flow groove 2c, the valve core 2 is internally provided with an installation cavity 201 with an upward opening, and the side wall of the valve core 2 is provided with a third through flow hole 29 used for communicating the installation cavity 201 and the first through flow groove 2a and a fourth through flow hole 2e used for communicating the installation cavity 201 and the second through flow groove 2 b.
The first one-way damping valve is arranged in the first damping channel 26, and oil can only flow into the second through-flow groove 2b from the third through-flow groove 2c through the first one-way damping valve and is reversely stopped; the first one-way damping valve comprises a first steel ball 71, a second spring 73 and a first damper 72, the first steel ball 71 can slide left and right in the first damping channel 26, the first damper 72 is fixedly connected in the first damping channel 26, a first damping hole 721 is arranged on the first damper 72, one end of the second spring 73 abuts against the first damper 72, and the other end of the second spring abuts against the first steel ball 71, so that the first steel ball 71 keeps the trend of blocking the communication between the first through flow groove 2a and the second through flow groove 2 b.
The second one-way damping valve is arranged in the second damping channel 27, and oil can only flow into the third through-flow groove 2c from the second through-flow groove 2b through the second one-way damping valve and is reversely stopped and not communicated; the second one-way damping valve comprises a second steel ball 81, a third spring 83 and a second damper 82, the second steel ball 81 can slide left and right in the second damping channel 27, the second damper 82 is fixedly connected in the second damping channel 27, a second damping hole 821 is arranged on the second damper 82, one end of the third spring 83 abuts against the second damper 82, the other end of the third spring abuts against the second steel ball 81, the trend that the second steel ball 81 separates the communication between the first through-flow groove 2a and the second through-flow groove 2b is kept, and the diameter of the second damping hole 821 is smaller than that of the first damping hole 721.
The plug 4 is fixedly connected to the lower end of the second mounting hole 101, and a plug through hole penetrating along the axial direction is formed in the plug 4;
the first spring 3 is arranged in the second mounting hole 101, one end of the first spring 3 is abutted against the plug 4, and the other end of the first spring 3 is abutted against the valve core 2 to keep the trend that the valve core 2 moves upwards;
the overflow valve assembly is installed in the installation cavity 201 and used for controlling the on-off of the third through-flow hole 29 and the fourth through-flow hole 2e, when the pressure of the fourth through-flow hole 2e is greater than the set pressure of the overflow valve assembly, the overflow valve assembly is opened, and oil flows into the third through-flow hole 29 through the fourth through-flow hole 2 e; the overflow valve assembly comprises an overflow valve core 91, an overflow spring 92 and a plug 93, wherein the overflow valve core 91 can be arranged in the mounting cavity 201 in a vertically sliding mode, the plug 93 is fixedly connected to the upper end of the mounting cavity 201, one end of the overflow spring 92 abuts against the plug 93, the other end of the overflow spring abuts against the overflow valve core 91, and the overflow valve core 91 keeps moving downwards to block the tendency that the third through hole 29 is communicated with the fourth through hole 2 e.
The two-position three-way electromagnetic reversing valve 5 is fixedly installed in the first installation hole 102, a first connector 51, a second connector 52 and a third connector 53 are arranged on the two-position three-way electromagnetic reversing valve 5, the first connector 51 is communicated with the first oil port X, the second connector 52 is communicated with the fourth oil port T, the third connector 53 is communicated with the control cavity 1a, when the two-position three-way electromagnetic reversing valve 5 is not electrified, the second connector 52 is communicated with the third connector 53, the first connector 51 is blocked and is not communicated, and when the two-position three-way electromagnetic reversing valve 5 is electrified, the first connector 51 is communicated with the third connector 53, and the second connector 52 is blocked and is not communicated;
the manual stop valve assembly is installed in the third installation hole 103 and used for controlling the connection and disconnection of the first oil port X and the fourth oil port T; the manual stop valve assembly comprises a stop valve core 61, a return spring 62, a threaded sleeve 63 and a button 64, wherein the threaded sleeve 63 is fixedly connected to a third mounting hole 103, the stop valve core 61 is arranged in the third mounting hole 103 in a vertically sliding mode and penetrates through an inner hole of the threaded sleeve 63 to extend above the threaded sleeve 63, the button 64 is fixedly connected to the upper end of the stop valve core 61, one end of the return spring 62 abuts against the threaded sleeve 63, the other end of the return spring abuts against the stop valve core 61, and therefore the stop valve core 61 keeps moving downwards to block the tendency that a second flow passage 106 is communicated with a first flow passage 105.
Wherein the spool 2 is switchable between a first position and a second position. When the valve core 2 is at the first position, the third shoulder 22 cuts off the first oil port X and the second oil port A, the fourth shoulder 23 blocks the third oil port B, and the first oil port X, the second oil port A, the third oil port B and the fourth oil port T are not communicated in pairs; when the valve core 2 is at the second position, the second through-flow groove 2B connects the first port X with the second port a, and the fourth through-flow groove 2d connects the third port B with the fourth port T.
The working principle and the process of the invention are as follows:
as shown in fig. 4, in use, the first port X of the present invention is communicated with the accumulator 10, the second port a is communicated with a rodless chamber of the boom cylinder 13 of the telescopic boom forklift, the third port B is communicated with a rod chamber of the boom cylinder 13, and the fourth port T is communicated with the oil tank 12.
Liquid filling stage: when the telescopic boom forklift does not need damping in normal operation, the two-position three-way electromagnetic directional valve 5 is controlled to be powered off, the control cavity 1a is communicated with the fourth oil port T through the third connector 53 and the second connector 52, the valve core 2 moves upwards to be located at the first position under the action force of the first spring 3, and the first oil port X, the second oil port A, the third oil port B and the fourth oil port T are not communicated in pairs. When the multiple directional control valve 11 controls the boom cylinder 13 to ascend, the pressure oil of the multiple directional control valve 11 enters the energy accumulator 10 through the second oil port a and the first one-way damping valve, and fills the energy accumulator 10. When the pressure in the accumulator 10 exceeds the safety pressure, the relief valve assembly is opened to discharge the pressure of the first port X to the fourth port T, thereby realizing the limitation of the highest pressure. When the multiple directional control valve 11 controls the boom cylinder 13 to descend, the pressure oil in the energy accumulator 10 passes through the first oil port X and the second one-way damping valve and then enters the second oil port a, so as to unload the energy accumulator 10.
A vibration reduction stage: when the telescopic boom forklift runs at a high speed, the two-position three-way electromagnetic directional valve 5 is controlled to be electrified, the first connector 51 is communicated with the third connector 53, pressure oil in the energy accumulator 10 enters the control cavity 1a through the two-position three-way electromagnetic directional valve 5 to push the valve core 2 to move downwards, the valve core 2 is switched to a second position, the first oil port X is communicated with the second oil port A, the third oil port B is communicated with the fourth oil port T, namely, a rodless cavity of the boom cylinder 13 is communicated with the energy accumulator 10, and a rod cavity of the boom cylinder 13 is communicated with the fourth oil port T. When the movable arm moves up and down along with the change of road conditions and moves upwards, oil in the energy accumulator 10 fills a rodless cavity of the movable arm oil cylinder 13 to jack the movable arm oil cylinder 13, and the oil in a rod cavity of the movable arm oil cylinder 13 returns to the oil tank 12 through a fourth oil port T; when the boom cylinder 13 moves downward, the oil in the rodless chamber of the boom cylinder 13 flows into the accumulator 10, and the oil in the oil tank 12 flows into the rod chamber of the boom cylinder 13, thereby achieving a state similar to floating during traveling, and achieving a vibration damping function.
When the vibration damper needs to be maintained due to a fault, the pressure in the energy accumulator 10 can be unloaded firstly by operating the manual stop valve assembly and then is disassembled, so that the maintenance is very convenient.
Claims (7)
1. The utility model provides a damping device for telescopic boom fork truck which characterized in that: comprises that
The valve body (1) is internally provided with a valve body through hole which penetrates along the axial direction, the valve body through hole comprises a first mounting hole (102), a communicating hole (104) and a second mounting hole (101) from top to bottom, a third mounting hole (103) is also arranged in the valve body (1), a first oil port (X), a second oil port (A) and a third oil port (B) which are communicated with the second mounting hole (101) are arranged on the side wall of the valve body (1) at intervals, and a fourth oil port (T) is formed by a lower opening of the second mounting hole (101);
the valve core (2), the valve core (2) can be arranged in the second mounting hole (101) in a vertically sliding manner, a first shoulder (20), a second shoulder (21), a third shoulder (22), a fourth shoulder (23) and a fifth shoulder (24) are arranged on the valve core (2) from top to bottom at intervals, a first through flow groove (2a) is formed between the first shoulder (20) and the second shoulder (21), a second through flow groove (2b) is formed between the second shoulder (21) and the third shoulder (22), a third through flow groove (2c) is formed between the third shoulder (22) and the fourth shoulder (23), a fourth through flow groove (2d) is formed between the fourth shoulder (23) and the fifth shoulder (24), a control cavity (1a) is formed between the upper end face of the valve core (2) and the bottom face of the second mounting hole (101), and a first through flow hole (25) with a downward opening is arranged in the valve core (2), the first through flow groove (2a) is communicated with the fourth oil port (T), a second through flow hole (28) used for communicating a fourth through flow groove (2d) with the first through flow hole (25) is formed in the side wall of the valve core (2), a first damping channel (26) and a second damping channel (27) used for communicating the second through flow groove (2b) with the third through flow groove (2c) are arranged in the valve core (2) in parallel, an installation cavity (201) with an upward opening is formed in the valve core (2), a third through flow hole (29) used for communicating the installation cavity (201) with the first through flow groove (2a) and a fourth through flow hole (2e) used for communicating the installation cavity (201) with the second through flow groove (2b) are formed in the side wall of the valve core (2);
the first one-way damping valve is arranged in the first damping channel (26), and oil can only flow into the second through-flow channel (2b) from the third through-flow channel (2c) through the first one-way damping valve and is reversely stopped and not communicated;
the second one-way damping valve is arranged in the second damping channel (27), and oil can only flow into the third flow through groove (2c) from the second flow through groove (2b) through the second one-way damping valve and is reversely stopped and not communicated;
the plug (4), the plug (4) is fixedly connected to the lower end of the second mounting hole (101), and a plug through hole penetrating along the axial direction is formed in the plug (4);
the first spring (3) is arranged in the second mounting hole (101), one end of the first spring (3) abuts against the plug (4), and the other end of the first spring (3) abuts against the valve core (2) to enable the valve core (2) to keep the trend of moving upwards;
the overflow valve assembly is arranged in the installation cavity (201) and used for controlling the on-off of the third through-flow hole (29) and the fourth through-flow hole (2e), when the pressure of the fourth through-flow hole (2e) is larger than the set pressure of the overflow valve assembly, the overflow valve assembly is opened, and oil flows into the third through-flow hole (29) through the fourth through-flow hole (2 e);
the two-position three-way electromagnetic reversing valve (5) is fixedly installed in the first installation hole (102), a first interface (51), a second interface (52) and a third interface (53) are arranged on the two-position three-way electromagnetic reversing valve (5), the first interface (51) is communicated with the first oil port (X), the second interface (52) is communicated with the fourth oil port (T), the third interface (53) is communicated with the control cavity (1a), when the two-position three-way electromagnetic reversing valve (5) is not electrified, the second interface (52) is communicated with the third interface (53) and the first interface (51) is blocked and is not communicated, and when the two-position three-way electromagnetic reversing valve (5) is electrified, the first interface (51) is communicated with the third interface (53) and the second interface (52) is blocked and is not communicated;
the manual stop valve assembly is arranged in the third mounting hole (103) and used for controlling the connection and disconnection of the first oil port (X) and the fourth oil port (T);
wherein the valve core (2) can be switched between a first position and a second position.
2. The vibration damping device for a telescopic arm forklift according to claim 1, wherein: when the valve core (2) is located at the first position, the third shoulder (22) cuts off the first oil port (X) and the second oil port (A), the fourth shoulder (23) blocks the third oil port (B), and the first oil port (X), the second oil port (A), the third oil port (B) and the fourth oil port (T) are not communicated in pairs; when the valve core (2) is located at the second position, the first oil port (X) is communicated with the second oil port (A) through the second through flow groove (2B), and the third oil port (B) is communicated with the fourth oil port (T) through the fourth through flow groove (2 d).
3. The vibration damping device for a telescopic arm forklift according to claim 1, wherein: the valve body (1) is internally provided with a first flow passage (105) used for communicating the first connector (51) with the first oil port (X) and a second flow passage (106) used for communicating the second connector (52) with the fourth oil port (T), the valve body (1) is internally provided with a third flow passage (107) used for communicating the first through flow groove (2a) with the second flow passage (106), the lower end of the third mounting hole (103) is communicated with the second flow passage (106), and the middle part of the third mounting hole (103) is communicated with the first flow passage (105).
4. The vibration damping device for a telescopic arm forklift according to claim 1, wherein: the first one-way damping valve comprises a first steel ball (71), a second spring (73) and a first damper (72), the first steel ball (71) can slide left and right and is arranged in the first damping channel (26), the first damper (72) is fixedly connected in the first damping channel (26), a first damping hole (721) is formed in the first damper (72), one end of the second spring (73) abuts against the first damper (72), the other end of the second spring abuts against the first steel ball (71), and the first steel ball (71) keeps the tendency of separating the communication between the first through flow groove (2a) and the second through flow groove (2 b).
5. The shock absorbing device for a telescopic arm forklift as set forth in claim 4, wherein: the second one-way damping valve comprises a second steel ball (81), a third spring (83) and a second damper (82), the second steel ball (81) can slide left and right in the second damping channel (27), the second damper (82) is fixedly connected in the second damping channel (27), a second damping hole (821) is formed in the second damper (82), one end of the third spring (83) abuts against the second damper (82), the other end of the third spring abuts against the second steel ball (81), the second steel ball (81) keeps the trend of separating the communication between the first through flow groove (2a) and the second through flow groove (2b), and the diameter of the second damping hole (821) is smaller than that of the first damping hole (721).
6. The vibration damping device for a telescopic arm forklift according to claim 1, wherein: the overflow valve assembly comprises an overflow valve core (91), an overflow spring (92) and a plug (93), the overflow valve core (91) can be arranged in the mounting cavity (201) in a vertically sliding mode, the plug (93) is fixedly connected to the upper end of the mounting cavity (201), one end of the overflow spring (92) abuts against the plug (93), the other end of the overflow spring abuts against the overflow valve core (91), and the overflow valve core (91) is enabled to keep moving downwards to block the trend that the third through flow hole (29) is communicated with the fourth through flow hole (2 e).
7. The vibration damping device for a telescopic arm forklift according to claim 3, wherein: the manual stop valve assembly comprises a stop valve core (61), a return spring (62), a threaded sleeve (63) and a button (64), wherein the threaded sleeve (63) is fixedly connected to a third mounting hole (103), the stop valve core (61) can be arranged in the third mounting hole (103) in a vertically sliding mode and penetrates through an inner hole of the threaded sleeve (63) to extend to the upper side of the threaded sleeve (63), the button (64) is fixedly connected to the upper end of the stop valve core (61), one end of the return spring (62) abuts against the threaded sleeve (63), the other end of the return spring abuts against the stop valve core (61), and the stop valve core (61) is enabled to keep moving downwards to block the trend that a second flow passage (106) is communicated with a first flow passage (105).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910966814.3A CN110683484B (en) | 2019-10-12 | 2019-10-12 | Vibration damper for telescopic arm forklift |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910966814.3A CN110683484B (en) | 2019-10-12 | 2019-10-12 | Vibration damper for telescopic arm forklift |
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| CN110683484A true CN110683484A (en) | 2020-01-14 |
| CN110683484B CN110683484B (en) | 2020-11-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113883212A (en) * | 2021-09-16 | 2022-01-04 | 中国煤炭科工集团太原研究院有限公司 | Damping valve and variable pump with same |
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| CN2521198Y (en) * | 2002-01-16 | 2002-11-20 | 陕西燎原航空机械制造公司 | Plunger damping hydraulic oil cylinder |
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| CN110683484B (en) | 2020-11-27 |
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Denomination of invention: A damping device for telescopic arm forklift Effective date of registration: 20211216 Granted publication date: 20201127 Pledgee: Zhejiang Hecheng Rural Commercial Bank Co.,Ltd. Pledgor: JIAXING QUANSHUN TOURIST PRODUCT Co.,Ltd. Registration number: Y2021330002555 |
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