CN112983924B - Plunger cylinder and vehicle - Google Patents
Plunger cylinder and vehicle Download PDFInfo
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- CN112983924B CN112983924B CN201911312140.1A CN201911312140A CN112983924B CN 112983924 B CN112983924 B CN 112983924B CN 201911312140 A CN201911312140 A CN 201911312140A CN 112983924 B CN112983924 B CN 112983924B
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- cylinder
- oil inlet
- plunger
- section
- plunger rod
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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
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
Abstract
The application discloses plunger jar reaches vehicle including this plunger jar. The plunger cylinder comprises a cylinder body and a plunger rod movably arranged on the cylinder body, and the plunger rod reciprocates relative to the cylinder body along the extending direction of the side wall of the cylinder body; the plunger rod comprises a first section and a second section connected with the first section, and the first section is contacted with the side wall; the plunger rod is provided with a first flow guide groove which penetrates through the first section to the second section, the second section is provided with a second flow guide groove, the cylinder body is provided with a first oil inlet and a second oil inlet, and when the plunger rod is close to the bottom wall, the first oil inlet and the second oil inlet are respectively positioned at two sides of the first section; when the plunger rod is far away from the bottom wall, the first oil inlet and the second oil inlet are both positioned between the first section far and the bottom wall. The application provides a plunger cylinder has the cushioning effect of scour protection top.
Description
Technical Field
The application relates to the technical field of hydraulic cylinders, in particular to a plunger cylinder and a vehicle.
Background
The hydraulic cylinder is an actuating element which drives a mechanical object to realize linear reciprocating motion by using the pressure of hydraulic oil. Among them, the plunger cylinder is a single-acting hydraulic cylinder and is widely applied to vehicles. For example, when the plunger rod in the plunger cylinder extends under the action of hydraulic oil pressure, the fork of a vehicle can be driven to move. However, when the plunger rod in the plunger cylinder is extended to the top, the impact of the plunger rod on the cylinder wall can not only cause the vibration of the pallet fork, but also generate larger noise due to no buffer effect. In this regard, a plunger cylinder with a buffering function needs to be designed.
Disclosure of Invention
The application provides a plunger cylinder, and the plunger rod has slowed down the speed that the plunger rod stretches out including the cooperation through position between first oil inlet and second oil inlet and the first section, has realized that the plunger rod stretches out the cushioning effect to the cylinder body roof.
In a first aspect, the present application provides a plunger cylinder. The plunger cylinder comprises a cylinder body and a plunger rod, the cylinder body comprises a top wall, a bottom wall and a side wall, the top wall and the bottom wall are two ends of the cylinder body which are oppositely arranged, and the side wall is connected with the top wall and the bottom wall; the cylinder body is provided with an accommodating space which is recessed from the top wall to the bottom wall, the plunger rod is mounted in the accommodating space, and the plunger rod reciprocates relative to the cylinder body along the extending direction of the side wall;
the plunger rod comprises a first section and a second section connected with the first section, the second section is positioned on one side of the first section, which is far away from the bottom wall, the second section and the side wall are arranged at intervals, and the first section is contacted with the side wall; the plunger rod is provided with a first diversion trench penetrating through the first section to the second section, the second section is provided with a second diversion trench, and the second diversion trench is sunken from the second section towards one side of the side wall to be communicated with the first diversion trench;
the cylinder body is provided with a first oil inlet and a second oil inlet, the first oil inlet is close to the bottom wall relative to the second oil inlet, and when the plunger rod is close to the bottom wall, the first oil inlet and the second oil inlet are positioned at two sides of the first section; when the plunger rod is away from the bottom wall, the first oil inlet and the second oil inlet are both located between the first section and the bottom wall.
In an embodiment, the first oil inlet and the second oil inlet are both disposed on the side wall, and the sectional areas of the first oil inlet and the second oil inlet are both larger than the sectional area of the second diversion trench.
In one embodiment, the second oil inlet is adjacent the top wall relative to the bottom wall, and the second flow guide groove is adjacent the second section relative to the second oil inlet when the plunger rod is adjacent the bottom wall.
In an embodiment, the second segment is further provided with a third guiding groove, the third guiding groove is recessed from one side of the second segment facing the side wall to be communicated with the first guiding groove, and the third guiding groove is arranged opposite to the second guiding groove.
In one embodiment, a side of the bottom wall facing the plunger rod is provided with a protrusion, which is inserted into the first guide groove when the plunger rod is close to the bottom wall.
In an embodiment, when the protrusion is inserted into the first diversion trench, the side wall of the protrusion abuts against the trench wall of the first diversion trench, and the hydraulic oil in the first diversion trench is extruded to the second diversion trench and finally discharged from the second oil inlet to the outside of the cylinder block.
In an embodiment, the plunger rod further includes a third section, the third section is located on a side of the first section far away from the second section, the third section is spaced from the sidewall, and the first guide groove is recessed from a side of the third section facing the bottom wall to the second section.
In one embodiment, the plunger cylinder further comprises a first seal assembly, the first seal assembly being disposed around the periphery of the first segment, and the first seal assembly abutting the sidewall.
In one embodiment, the plunger cylinder further comprises a second sealing assembly embedded in the top wall and surrounding the periphery of the plunger rod.
In a second aspect, the present application provides a vehicle. The vehicle comprises a vehicle body and the plunger cylinder, wherein the plunger cylinder is arranged on the vehicle body.
In one embodiment, the vehicle further includes a first hydraulic cylinder and a second hydraulic cylinder, the plunger cylinder is located between the first hydraulic cylinder and the second hydraulic cylinder, and a cylinder diameter of the plunger cylinder is larger than cylinder diameters of the first hydraulic cylinder and the second hydraulic cylinder.
In one embodiment, the first and second hydraulic cylinders are both piston cylinders.
In one embodiment, the vehicle further comprises a controller and an oil distribution valve, the controller is coupled with the oil distribution valve, the oil distribution valve is connected with the plunger cylinder, and when the plunger rod retracts to the bottom wall, the controller controls the oil distribution valve to enable hydraulic oil to enter the cylinder body from the first oil inlet and the second oil inlet; when the cylinder body is filled with hydraulic oil, the controller controls the oil distribution valve to stop feeding oil to the second oil inlet and continue feeding oil to the first oil inlet, so that the plunger rod extends out relative to the cylinder body.
In the embodiment of the application, the plunger cylinder is provided with a first oil inlet, a second oil inlet and a diversion trench for communicating the first oil inlet and the second oil inlet, when the plunger rod is positioned at the bottom of the cylinder body, the first oil inlet and the second oil inlet are respectively positioned at two sides of a first section (piston-shaped structure) of the plunger rod, and at the moment, the residual oil in one side of the first section, which is close to the top wall, can be discharged from the second oil inlet and the second diversion trench; when the plunger rod is positioned at the top of the cylinder body, the first oil inlet and the second oil inlet are both positioned on one side, far away from the second flow guide groove, of the plunger rod, so that the residual oil in one side, close to the top wall, of the first section cannot be discharged from the second oil inlet and can only be discharged from the second flow guide groove, the rate of discharging the residual oil in one side, close to the top wall, of the first section is reduced, the stretching rate of the plunger rod is slowed down, the buffer effect that the plunger rod stretches out of the top wall of the cylinder body is achieved, the top wall is prevented from being collided when the plunger rod stretches out of the top wall, and the purpose that the plunger cylinder prevents the top collision is achieved.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;
FIG. 2 is a schematic illustration of the plunger cylinder of FIG. 1 in a first state;
FIG. 3 is a schematic structural view of the plunger cylinder of FIG. 1 in a second state;
FIG. 4 is a schematic cross-sectional view of the structure of FIG. 2 taken along line A-A;
FIG. 5 is a schematic cross-sectional view of the structure of FIG. 3 taken along line B-B;
fig. 6 is a partial structural schematic view of the vehicle shown in fig. 1.
Detailed Description
Technical solutions in embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present disclosure. The embodiment of the application provides a vehicle 100. The vehicle 100 is a wheeled vehicle driven or towed by a power unit, driven on a road, and used for riding a person or carrying an article. In the embodiment of the present application, a vehicle is described as an example of a transportation vehicle such as a forklift.
The vehicle 100 includes a vehicle body 101 and a plunger cylinder 102. The plunger cylinder 102 is mounted to the vehicle body 101. The ram cylinder 102 is one form of hydraulic cylinder construction. The plunger cylinder 102 is widely used in various devices due to its excellent manufacturability and low cost, for example: fork truck, planer, rail grinder, large broaching machine, etc. In the embodiment of the present application, the plunger cylinder 102 is described as an example of application to a forklift. As shown in fig. 1, the vehicle 100 also includes forks 103. The forks 103 are adapted to be moved by the plunger cylinders 102 to carry cargo.
Referring to fig. 2 and 3 together, fig. 2 is a schematic structural diagram of the plunger cylinder 102 shown in fig. 1 in a first state; fig. 3 is a schematic structural view of the plunger cylinder 102 shown in fig. 2 in a second state. The plunger cylinder 102 includes a cylinder 21 and a plunger rod 22 movably attached to the cylinder 21. The cylinder 21 is provided as a hollow structure. The plunger rod 22 reciprocates within the hollow structure. As shown in fig. 2, the plunger rod 22 is retracted into the cylinder 21. As shown in fig. 3, part of the plunger rod 22 protrudes out of the cylinder 21.
The cylinder 21 is provided with an oil inlet 210. The oil inlet 210 communicates with a space in the cylinder 21 for accommodating the plunger rod 22. When the plunger rod 22 retracts into the cylinder 21, a controller in the vehicle 100 controls hydraulic oil to enter the accommodating space in the cylinder 21 from the oil inlet 210, and the hydraulic oil in the cylinder 21 generates pressure on the plunger rod 22 to push the plunger rod 22 to extend; when the plunger rod 22 extends to the top, the controller controls the hydraulic oil to stop entering the cylinder 21, and the plunger rod 22 stops extending; when the plunger rod 22 is extended to the top, the plunger rod 22 discharges the hydraulic oil in the cylinder 21 out of the cylinder 21 from the oil inlet 210 under the action of an external force, so that the plunger rod 22 is retracted into the cylinder 21.
Referring to fig. 3 and 4, fig. 4 is a schematic cross-sectional view of the structure shown in fig. 2 along the line a-a. The cylinder 21 includes a top wall 211, a bottom wall 212, and a side wall 213. The top wall 211 and the bottom wall 212 are opposite ends of the cylinder 21. The side walls 213 extend in a direction toward the top wall 211 and the bottom wall 212, and connect the top wall 211 and the bottom wall 212. The cylinder block 21 is provided with a housing space 214 recessed from the top wall 211 toward the bottom wall 212. Some or all of the plunger rod 22 is accommodated in the accommodating space 214. The plunger rod 22 moves relative to the cylinder 21 in the direction in which the side wall 213 extends. As shown in fig. 3, a part of the plunger rod 22 extends out of the cylinder 21, which shows that a part of the plunger rod 22 is accommodated in the accommodating space 214. As shown in fig. 4, the plunger rod 22 is retracted to the bottom of the cylinder 21, and all the plunger rod 22 is accommodated in the accommodation space 214.
As shown in fig. 4, the second section 222 is spaced from the sidewall 213, so that when all the plunger rods 22 are accommodated in the accommodating space 214, a gap is formed between the plunger rods 22 and the sidewall 213, and the gap provides an oil path for hydraulic oil to enter the bottom of the plunger rods 22. The first section 221 contacts the side wall 213, and the first section 221 is similar to a piston structure, and divides the receiving space 214 in the cylinder 21 into two first receiving spaces 2141 and a second receiving space 2142 arranged at an interval. It can be understood that the sizes of the first and second receiving spaces 2141 and 2142 change as the plunger rod 22 moves during the reciprocating motion of the plunger rod 22 relative to the cylinder 21. The first receiving space 2141 is a space on the side of the first segment 221 facing the bottom wall 213, and the second receiving space 2142 is a space on the side of the first segment 221 facing the top wall 211.
Further, referring to fig. 4 and 5, fig. 5 is a schematic cross-sectional view of the structure shown in fig. 3 along the line B-B. The plunger rod 22 is provided with a first guide groove 231 penetrating from the first section 221 to the second section 222. Second section 222 is provided with second channels 232. Second guiding gutter 232 is recessed from second section 222 towards side wall 213 to communicate with first guiding gutter 231. That is, the first guide groove 231 communicates with the second guide groove 232. It can be understood that, since the first section 221 divides the cylinder 21 into two first receiving spaces 2141 and a second receiving space 2142 arranged at an interval, the first guiding groove 231 and the second guiding groove 232 can communicate the first receiving space 2141 with the second receiving space 2142, so that the oil passages on both sides of the first section 221 can communicate.
In one embodiment, the plunger rod 22 further includes a third section 223. The third segment 223 is located on a side of the first segment 221 away from the second segment 222, and the third segment 223 is spaced apart from the sidewall 213. That is, the first segment 221 is located between the second segment 222 and the third segment 223, and only the first segment 221 contacts the sidewall 213. First channel 231 is recessed from third segment 223 to second segment 222 toward the side of bottom wall 212. As shown in fig. 4, the third section 223 is spaced from the side wall 213, so that when the plunger rod 22 approaches the bottom wall 212, a gap is formed between the first oil inlet 210 and the plunger rod 22, so that the hydraulic oil of the first oil inlet 210 can flow into the cylinder 21 from the gap between the third section and the side wall 213.
Further, referring to fig. 4 and 5, the cylinder 21 has a first oil inlet 2101 and a second oil inlet 2102. That is, oil inlet 210 includes a first oil inlet 2101 and a second oil inlet 2102. The first oil inlet 2101 is adjacent the bottom wall 212 relative to the second oil inlet 2102. When the plunger rod 22 is adjacent the bottom wall 212, the first oil inlet 2101 and the second oil inlet 2102 are located on either side of the first segment 221. As can be understood, the first oil inlet 2101 communicates with the first guide groove 231 through the first receiving space 2141, and the second oil inlet 2102 communicates with the second guide groove 232 through the second receiving space 2142. The first oil inlet 2101, the first guide groove 231, the second guide groove 232, and the second oil inlet 2102 form a communicated oil path.
As shown in fig. 4, when the plunger rod 22 is close to the bottom wall 212, the first oil inlet 2101 is located on the side of the first section 221 close to the bottom wall 212, and the second oil inlet 2102 and the second guide groove 232 are located on the side of the first section 221 away from the bottom wall 212. That is, the first oil inlet 2101 is communicated with the first receiving space 2141, the second oil inlet 2102 is communicated with the second receiving space 2142, when the pressure of the first receiving space 2141 is greater than the pressure of the second receiving space 2142, the plunger rod 22 extends out of the cylinder 21, and at this time, the hydraulic oil on the left side of the first section 221 can be discharged out of the cylinder 21 through the second oil inlet 2102. Wherein the first oil inlet 2101 is in communication with the second oil inlet 2102. When the hydraulic oil remaining in the plunger cylinder 102 is discharged from the second oil inlet 2102, the hydraulic oil can be discharged from the first oil inlet 2101 into the plunger cylinder 102 again.
When the plunger rod 22 is distal to the bottom wall 212, the first oil inlet 2101 and the second oil inlet 2102 are both located between the first segment 221 and the bottom wall 212. As shown in fig. 5, when the plunger rod 22 extends out to the top wall 211, the first oil inlet 2101 and the second oil inlet 2102 are located on the right side of the first section 221, and the second guiding groove 232 is located on the side of the first section 221 away from the bottom wall 212, so that the second guiding groove 232 is located on the side of the first section 221 away from the first oil inlet 2101 and the second oil inlet 2102, and at this time, the remaining hydraulic oil in the second accommodating space 2142 can only flow into the second guiding groove 232, be discharged to the first guiding groove 231, and then flow into the first accommodating space 2141.
It can be understood that when the plunger rod 22 is close to the bottom wall 212, after the hydraulic oil enters the cylinder 21 from the first oil inlet 2101 and the second oil inlet 2102 and fills the cylinder 21, the second oil inlet 2102 stops feeding the oil, and the first oil inlet 2101 continues feeding the oil, at this time, the pressure of the side (the first accommodating space 2141) of the first section 221 close to the first oil inlet 2101 is greater than the pressure of the side (the second accommodating space 2142) of the first section 221 close to the second oil inlet 2102, so that the plunger rod 22 is extended relative to the cylinder 21.
When the plunger rod 22 extends out, the first oil inlet 2101 and the second oil inlet 2102 are respectively located at two sides of the first section 221, pressure generated by hydraulic oil in the first accommodating space 2141 is greater than pressure generated by hydraulic oil in the second accommodating space 2142, so that the hydraulic oil in the second accommodating space 2142 is discharged from the second oil inlet 2102, and flows into the first accommodating space 2141 after flowing into the first flow guide groove 231 from the second flow guide groove 232 due to pressure difference. However, in the process of extending the plunger rod 22, when the plunger rod 22 extends to the same side as the first oil inlet 2101 and the second oil inlet 2102, the hydraulic oil in the second accommodating space 2142 cannot be discharged from the second oil inlet 2102 due to the blocking of the first section 221, and only can flow into the first guiding groove 231 from the second guiding groove 232 and then flow into the first accommodating space 2141, so that the rate of discharging the remaining oil amount in the second accommodating space 2142 is reduced, and the rate of extending the plunger rod 22 out of the cylinder 21 is reduced to form a buffering effect.
In the embodiment of the present application, the plunger cylinder 102 is provided with a first oil inlet 2101, a second oil inlet 2102 and a guiding groove for communicating the first oil inlet 2101 and the second oil inlet 2102, when the plunger rod 22 is located at the bottom of the cylinder 21, the first oil inlet 2101 and the second oil inlet 2102 are respectively located at two sides of a first section 221 (piston-like structure) of the plunger rod 22, at this time, the remaining oil amount in the side of the first section 221 close to the top wall 211 can be discharged from the second oil inlet 2102 and the second guiding groove 232, and when the plunger rod 22 is located at the top of the cylinder 21, the first oil inlet 2101 and the second oil inlet 2102 are both located at the side of the plunger rod 22 far from the second guiding groove 232, so that the remaining oil amount in the side of the first section 221 close to the top wall 211 cannot be discharged from the second oil inlet 2102 and can only be discharged from the second guiding groove 232, thereby reducing the discharging rate of the remaining oil amount in the side of the first section 221 close to the top wall 211, thereby slowing down the extending rate of the plunger rod 22, the buffer effect of the plunger rod 22 extending to the top wall 211 of the cylinder 21 is realized, so that the plunger rod 22 is prevented from colliding with the top wall 211 when extending to the top wall 211, and the plunger cylinder 102 achieves the purpose of roof collision prevention.
In the embodiment of the present application, when the plunger rod 22 extends to the same side of the first oil inlet 2101 as the second oil inlet 2102, the residual hydraulic oil at the side of the first segment 221 close to the top wall 211 is discharged from the second guide groove 232 only to reduce the discharge flow of the residual hydraulic oil, that is, when the plunger rod 22 extends to the same side of the first segment 221 as the second oil inlet 2102 and the first oil inlet 2101, the plunger rod 22 starts to buffer. It can be appreciated that in the present embodiment, the length of the damping distance of the plunger rod 22 can be controlled by controlling the position of the second oil inlet 2102.
In one embodiment, the second oil inlet 2102 is located adjacent to the top wall 211 relative to the bottom wall 212 and when the plunger rod 22 is adjacent to the bottom wall 212. Second flow channel 232 is adjacent second segment 222 relative to second oil inlet 2102.
In the embodiment of the present application, the second oil inlet 2102 is close to the top wall 211 relative to the bottom wall 212, so that the plunger rod 22 can extend for a relatively long distance and then achieve buffering, and the buffering time is prevented from being too long, so as to increase the average speed of the plunger rod 22 extending out of the cylinder 21 and increase the reciprocating speed of the plunger rod 22.
In one embodiment, the first oil inlet 2101 and the second oil inlet 2102 are both disposed on the side wall 213, and the cross-sectional areas of the first oil inlet 2101 and the second oil inlet 2102 are both larger than the cross-sectional area of the second diversion trench 232. That is, the flow rates of the first oil inlet 2101 and the second oil inlet 2102 are greater than the flow rate of the second diversion trench 232. For example, when the first oil inlet 2101, the second oil inlet 2102 and the second guiding groove 232 are all circular holes, the calibers of the first oil inlet 2101 and the second oil inlet 2102 are greater than the calibers of the second guiding groove 232. It can be understood that the aperture of the second guiding groove 232 is smaller, and the corresponding flow rate is smaller.
In this embodiment of the application, the sectional area of the second flow guiding groove 232 is smaller than the sectional area of the second oil inlet 2102, so that in the process that the plunger rod 22 extends out of the cylinder 21, when the first oil inlet 2101 and the second oil inlet 2102 are both located on the side of the plunger rod 22 away from the second flow guiding groove 232, the amount of the hydraulic oil discharged from the second flow guiding groove 232 by the remaining oil amount in the side of the first section 221 close to the top wall 211 is reduced, the rate of discharging the remaining oil amount in the side of the first section 221 close to the top wall 211 is effectively reduced, the extending rate of the plunger rod 22 is effectively slowed down, and the buffer effect that the plunger rod 22 extends out of the top wall 211 of the cylinder 21 is realized.
Further, referring to fig. 5, the second section 222 is further provided with a third guiding groove 233. The third guiding groove 233 is recessed from one side of the second section 222 facing the sidewall 213 to communicate with the first guiding groove 231, and the third guiding groove 233 and the second guiding groove 232 are disposed opposite to each other. As shown in fig. 5, the second guiding groove 232 and the third guiding groove 233 are respectively located on two opposite sides of the plunger rod 22.
In this embodiment, the second guiding groove 232 and the third guiding groove 233 are respectively located on two sides of the plunger rod 22 opposite to each other, so that when the first oil inlet 2101 and the second oil inlet 2102 are both located on the same side as the first section 221, the remaining hydraulic oil on the side of the first section 221 facing the top end can flow into the first guiding groove 231 from two sides of the plunger rod 22 opposite to each other, and it is avoided that the remaining hydraulic oil on the side of the first section 221 facing the top end can only flow out from the second guiding groove 232 on the side of the plunger rod 22, which results in that the extension speed of the plunger rod 22 is too slow, and the reciprocating efficiency of the plunger rod 22 is reduced.
In one embodiment, the side of the bottom wall 212 facing the plunger rod 22 is provided with a protrusion 24. Wherein the protrusion 24 and the bottom wall 212 can be integrally formed, so as to simplify the preparation process of the plunger cylinder 102. When the plunger rod 22 is close to the bottom wall 212, the protrusion 24 is inserted into the first guide groove 231.
In the embodiment of the present application, the bottom of the plunger rod 22 is provided with the first section 221 similar to a piston structure, the first section 221 divides the accommodating space 214 in the plunger cylinder 102 into two spaces arranged at intervals, so that when the plunger rod 22 is close to the bottom wall 212, the protrusion 24 is inserted into the first guiding groove 231, and a damping effect is formed, so that when the plunger rod 22 is close to the bottom wall 212, a buffering effect is formed, and the plunger rod 22 is prevented from colliding with the bottom wall 212 when the plunger rod 22 is close to the bottom wall 212, thereby achieving the purpose of preventing bottom collision. And the bottom wall 212 is provided with the bulge 24, the bottom of the plunger rod 22 is provided with the first diversion groove 231, the bottom impact prevention structure forming the damping effect is simple, and the volume of the plunger cylinder 102 cannot be increased only by the change of the internal structure of the plunger cylinder 102.
It will be appreciated that when the bottom wall 212 is not provided with the projection 24 on the side facing the plunger rod 22, the hydraulic oil in the first section 221 on the side close to the bottom wall 212 is directly discharged from the first oil inlet 2101 to the outside of the cylinder 21 during the process that the plunger rod 22 approaches the bottom wall 212, and no buffering action will cause the plunger rod 22 to hit the bottom wall 212. In the present embodiment, when the protrusion 24 is inserted into the first guiding groove 231, a damping effect is formed, so that the plunger rod 22 is adjacent to the bottom wall 212 to form a buffering effect, and the plunger rod 22 is prevented from colliding with the bottom wall 212 when approaching to the bottom wall 212.
When the protrusion 24 is inserted into the first flow guiding groove 231, the remaining hydraulic oil in the first flow guiding groove 231 can be extruded to the second flow guiding groove 232 and then discharged from the second oil inlet 2102 to the outside of the cylinder 21, so that the plunger rod 22 is close to the bottom wall 212. When the protrusion 24 is inserted into the first flow guiding groove 231, a part of the hydraulic oil remaining in the first flow guiding groove 231 can be discharged from the second oil inlet 2102 to the outside of the cylinder 21 after being pressed to the second flow guiding groove 232 by the protrusion 24, and another part of the hydraulic oil remaining in the first flow guiding groove 231 is discharged from the first oil inlet 2101 after being discharged to the gap between the protrusion 24 and the first flow guiding groove 231, so that the plunger rod 22 is close to the bottom wall 212.
Referring to fig. 4, in one embodiment, when the protrusion 24 is inserted into the first guiding groove 231, the sidewall 213 of the protrusion 24 abuts against the wall of the first guiding groove 231, and the hydraulic oil in the first guiding groove 231 is pressed toward the second guiding groove 232. The hydraulic oil that is pushed toward the second guide groove 232 is finally discharged from the second oil inlet 2102 to the outside of the cylinder block 21.
As shown in fig. 4, when the protrusion 24 is inserted into the first flow guiding groove 231, the sidewall 213 of the protrusion 24 contacts the wall of the first flow guiding groove 231, that is, there is no gap between the sidewall 213 of the protrusion 24 and the wall of the first flow guiding groove 231 for the hydraulic oil to flow through, so that the hydraulic oil remaining in the first flow guiding groove 231 can only be extruded to the second flow guiding groove 232 and then discharged from the second oil inlet 2102 to the outside of the cylinder 21.
In the embodiment of the present application, since the aperture of the second guiding groove 232 is smaller, when the protrusion 24 is inserted into the first guiding groove 231, the formed damping effect is larger, and the flow rate of the hydraulic oil discharged to the outside of the cylinder 21 is smaller, so that the speed of the plunger rod 22 approaching the bottom wall 212 is slower, and the bottom impact prevention buffering effect of the plunger cylinder 102 is further improved.
Further, with continued reference to fig. 5, the plunger cylinder 102 further includes a first seal 25. The first sealing member 25 is disposed around the periphery of the first section 221, and the first sealing member 25 abuts against the sidewall 213. The first sealing element 25 can be a sealing ring, such as a rubber ring, disposed around the periphery of the first section 221.
In the embodiment of the present application, the first sealing element 25 can enable the first segment 221 to form a sealed piston structure, and prevent hydraulic oil on two sides of the first segment 221 from being communicated with the side wall 213 through a gap between the first segment 221 and the side wall, so as to further improve the bottom and top impact prevention effect of the plunger cylinder 102.
Further, the plunger cylinder 102 also includes a second seal 26. The second sealing member 26 is embedded in the top wall 211, and the second sealing member 26 surrounds the periphery of the plunger rod 22. It will be appreciated that the inside of the second seal 26 abuts the outside of the plunger rod 22. Wherein the second sealing member 26 can be a sealing ring, such as a rubber ring, embedded in the top wall 211.
In this application embodiment, second sealing member 26 inlays and locates roof 211 and butt plunger rod 22, avoids being located the hydraulic oil of cylinder body 21 and flows out from the opening part of roof 211, has not only improved plunger cylinder 102 and has prevented rushing to the end and the effect of preventing rushing to the top, has also guaranteed plunger cylinder 102's reliability.
Further, with continued reference to fig. 6, fig. 6 is a partial structural schematic diagram of the vehicle 100 shown in fig. 1. Vehicle 100 also includes a first hydraulic cylinder 104 and a second hydraulic cylinder 105. The plunger cylinder 102 is located between the first hydraulic cylinder 104 and the second hydraulic cylinder 105, and the cylinder diameter of the plunger cylinder 102 is larger than the cylinder diameters of the first hydraulic cylinder 104 and the second hydraulic cylinder 105. In the embodiment of the present application, the vehicle 100 includes a plurality of hydraulic cylinders, so that the vehicle 100 can achieve multi-stage lifting. In one embodiment, the first cylinder 104 and the second cylinder 105 are both piston cylinders. The first hydraulic cylinder 104 and the second hydraulic cylinder 105 are both ordinary piston cylinders, so that the cost of the hydraulic system of the vehicle 100 is reduced.
The vehicle 100 further includes a controller 106 and an oil distribution valve 107. The controller 106 is coupled to a dispensing valve 107. The oil distribution valve 107 connects the plunger cylinder 102, the first hydraulic cylinder 104, and the second hydraulic cylinder 105. As shown in fig. 6, when the hydraulic oil is distributed to the plunger cylinder 102, the first hydraulic cylinder 104, and the second hydraulic cylinder 105 through the oil distribution valve 107 by a broken line, the plunger cylinder 102 has a large cylinder diameter and a large cross-sectional area, and as is clear from F ═ P (pressure) × S (cross-sectional area), the plunger cylinder 102 having a large cylinder diameter requires a small pressure to lift and the plunger cylinder 102 in the middle lifts first under the same force. After the middle plunger cylinder 102 is lifted, the oil pump continues to convey hydraulic oil to the oil path, at this time, the pressure in the oil path continues to increase, when the pressure reaches the pressure required by the lifting of the first hydraulic cylinder 104 and the second hydraulic cylinder 105, the first hydraulic cylinder 104 and the second hydraulic cylinder 105 start to lift until the lifting of the first hydraulic cylinder 104 and the second hydraulic cylinder 105 is finished, and the lifting action of the hydraulic system of the vehicle 100 is finished.
When the piston rods of the first and second hydraulic cylinders 104 and 105 on both sides and the plunger cylinder 102 in the middle are retracted by the external force, since the cylinder diameters of the first and second hydraulic cylinders 104 and 105 on both sides are small and the first and second hydraulic cylinders 104 and 105 have a large pressure as shown by the formula P (pressure)/S (cross-sectional area), the first and second hydraulic cylinders 104 and 105 are first lowered, and after the first and second hydraulic cylinders 104 and 105 are lowered to the bottom, the middle plunger cylinder 102 starts to be lowered until the plunger cylinder 102 is lowered to the bottom, and the lowering operation of the hydraulic system of the vehicle 100 is completed.
It can be understood that, in the embodiment of the present application, in the lifting process of the hydraulic system of the vehicle 100, the plunger cylinder 102 with the larger cylinder diameter lifts first, in the descending process of the hydraulic system of the vehicle 100, the plunger cylinder 102 with the smaller cylinder diameter descends last, and when the plunger cylinder 102 is applied to a multi-stage scene, the plunger cylinder 102, the first hydraulic cylinder 104 and the second hydraulic cylinder 105 are used in cooperation to realize multi-stage buffering, so that the buffering is more stable, and the lifting system has a compact structure, and is convenient for application in a narrow space.
Further, referring to fig. 4 and 6, the oil distributing valve 107 is connected to the plunger cylinder 102. When the plunger rod 22 is near the bottom wall 212, the controller 106 controls the oil distribution valve 107 to allow hydraulic oil to enter the cylinder 21 from the first oil inlet 2101 and the second oil inlet 2102. When the cylinder 21 is filled with hydraulic oil, the controller 106 controls the oil distribution valve 107 to stop feeding oil to the second oil inlet 2102 and continue feeding oil to the first oil inlet 2101, so that the plunger rod 22 is extended relative to the cylinder 21.
In the embodiment of the present application, when the plunger rod 22 is close to the bottom wall 212, after the hydraulic oil enters the cylinder 21 from the first oil inlet 2101 and the second oil inlet 2102 and fills the cylinder 21, the second oil inlet 2102 stops feeding the oil, and the first oil inlet 2101 continues feeding the oil, at this time, the pressure of the side of the first section 221 close to the first oil inlet 2101 is greater than the pressure of the side (the second accommodating space 2142) of the first section 221 close to the second oil inlet 2102, so that the plunger rod 22 extends relative to the cylinder 21.
When the plunger rod 22 extends out, the first oil inlet 2101 and the second oil inlet 2102 are respectively located at two sides of the first section 221, pressure generated by hydraulic oil in the first accommodating space 2141 is greater than pressure generated by hydraulic oil in the second accommodating space 2142, so that the hydraulic oil in the second accommodating space 2142 is discharged from the second oil inlet 2102, and flows into the first accommodating space 2141 after flowing into the first flow guide groove 231 from the second flow guide groove 232 due to pressure difference. However, in the process of extending the plunger rod 22, when the plunger rod 22 extends to the same side as the first oil inlet 2101 and the second oil inlet 2102, the hydraulic oil in the second accommodating space 2142 cannot be discharged from the second oil inlet 2102 due to the blocking of the first section 221, and only can flow into the first guiding groove 231 from the second guiding groove 232 and then flow into the first accommodating space 2141, so that the rate of discharging the remaining oil amount in the second accommodating space 2142 is reduced, and the rate of extending the plunger rod 22 out of the cylinder 21 is reduced to form a buffering effect.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the methods and their core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (13)
1. The plunger cylinder is characterized by comprising a cylinder body and a plunger rod, wherein the cylinder body comprises a top wall, a bottom wall and a side wall, the top wall and the bottom wall are two ends which are arranged oppositely to the cylinder body, and the side wall is connected with the top wall and the bottom wall; the cylinder body is provided with an accommodating space which is recessed from the top wall to the bottom wall, the plunger rod is mounted in the accommodating space, and the plunger rod reciprocates relative to the cylinder body along the extending direction of the side wall;
the plunger rod comprises a first section and a second section connected with the first section, the second section is positioned on one side of the first section, which is far away from the bottom wall, the second section and the side wall are arranged at intervals, and the first section is contacted with the side wall; the plunger rod is provided with a first diversion trench penetrating through the first section to the second section, the second section is provided with a second diversion trench, and the second diversion trench is sunken from the second section towards one side of the side wall to be communicated with the first diversion trench; the first section divides the accommodating space into a first accommodating space and a second accommodating space which are arranged at intervals, and the first guide groove and the second guide groove conduct the first accommodating space and the second accommodating space;
the cylinder body is provided with a first oil inlet and a second oil inlet, the first oil inlet is close to the bottom wall relative to the second oil inlet, and when the plunger rod is close to the bottom wall, the first oil inlet and the second oil inlet are positioned at two sides of the first section; when the plunger rod is away from the bottom wall, the first oil inlet and the second oil inlet are both located between the first section and the bottom wall.
2. The plunger cylinder according to claim 1, wherein the first oil inlet and the second oil inlet are both disposed in the sidewall, and the cross-sectional areas of the first oil inlet and the second oil inlet are both larger than the cross-sectional area of the second diversion trench.
3. The ram cylinder of claim 1, wherein the second oil inlet is adjacent the top wall relative to the bottom wall, and wherein the second flow guide groove is adjacent the second segment relative to the second oil inlet when the ram rod is retracted into the bottom wall.
4. The plunger cylinder according to claim 1, wherein the second segment is further provided with third guiding grooves which are recessed from a side of the second segment facing the side wall to communicate with the first guiding grooves, and the third guiding grooves are provided opposite to the second guiding grooves.
5. Plunger cylinder according to any one of claims 1-4, characterised in that the side of the bottom wall facing the plunger rod is provided with a projection which, when the plunger rod is retracted into the bottom wall, is inserted into the first guide groove.
6. The plunger cylinder according to claim 5, wherein when the protrusion is inserted into the first flow guide groove, the side wall of the protrusion abuts against the wall of the first flow guide groove, and hydraulic oil in the first flow guide groove is pressed toward the second flow guide groove.
7. The plunger cylinder according to claim 5, wherein the plunger rod further includes a third segment located on a side of the first segment remote from the second segment, the third segment being spaced from the sidewall, the first channel being recessed from a side of the third segment toward the bottom wall to the second segment.
8. The plunger cylinder according to claim 5, wherein the plunger cylinder further comprises a first seal assembly disposed about a periphery of the first segment, the first seal assembly abutting the sidewall.
9. The plunger cylinder according to claim 5, wherein the plunger cylinder further comprises a second sealing assembly embedded in the top wall and surrounding the periphery of the plunger rod.
10. A vehicle comprising a vehicle body and a plunger cylinder according to any one of claims 1 to 9, said plunger cylinder being mounted to said vehicle body.
11. The vehicle of claim 10, further comprising a first hydraulic cylinder and a second hydraulic cylinder, wherein the plunger cylinder is located between the first hydraulic cylinder and the second hydraulic cylinder, and wherein a cylinder diameter of the plunger cylinder is greater than cylinder diameters of the first hydraulic cylinder and the second hydraulic cylinder.
12. The vehicle of claim 11, characterized in that the first hydraulic cylinder and the second hydraulic cylinder are both piston cylinders.
13. The vehicle of claim 10, further comprising a controller and an oil distribution valve, wherein the controller is coupled to the oil distribution valve, the oil distribution valve is connected to the plunger cylinder, and when the plunger rod is retracted to the bottom wall, the controller controls the oil distribution valve to allow hydraulic oil to enter the cylinder body from the first and second oil inlets; when the cylinder body is filled with hydraulic oil, the controller controls the oil distribution valve to stop feeding oil to the second oil inlet and continue feeding oil to the first oil inlet, so that the plunger rod extends out relative to the cylinder body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911312140.1A CN112983924B (en) | 2019-12-18 | 2019-12-18 | Plunger cylinder and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911312140.1A CN112983924B (en) | 2019-12-18 | 2019-12-18 | Plunger cylinder and vehicle |
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| CN112983924A CN112983924A (en) | 2021-06-18 |
| CN112983924B true CN112983924B (en) | 2022-05-13 |
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| CN112983924A (en) | 2021-06-18 |
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