TW202411542A - Multi-section cylinder and flow control method for the same - Google Patents

Abstract

Disclosed is a multi-section cylinder comprising a base cylinder, at least one extension cylinder, and an actuating shaft, wherein the multi-section cylinder is capable of acting to an extended state by inputting a pressurized fluid from a single fluid inlet, and is capable of acting to a retracted state by applying a backward external force without additional fluid pressure control, thereby facilitating the execution of extension and retraction actions of the multi-section cylinder with simple control.

Description

Multi-section cylinder and flow path control method thereof

The present invention relates to a hydraulic cylinder, and more particularly to a multi-section cylinder and a flow path control method thereof.

Hydraulic cylinders, also known as oil cylinders, can convert hydraulic pressure into force to move the piston. By inputting pressurized liquid, the piston can be pushed outward, causing the piston rod to extend; by inputting pressurized liquid on the other side of the piston, the piston can be pushed inward, causing the piston rod to retract. Therefore, hydraulic cylinders are widely used in various mechanisms.

The extension and retraction distance of a hydraulic cylinder is mainly determined by the length of the cylinder chamber. To obtain a larger extension and retraction distance, a longer hydraulic cylinder is often required, but the difficulty of installation will also increase. Therefore, in order to obtain a longer extension and retraction distance in a short hydraulic cylinder, a multi-section cylinder with multiple intermediate cylinders between the cylinder body and the piston rod came into being.

However, the extension and retraction of multi-section cylinders requires hydraulic control of each section of the cylinder. Therefore, as the extension and retraction distance increases, the number of cylinders (sections) required will also increase, and the difficulty of control will also increase significantly. This situation of complex hydraulic control in order to achieve simple mechanism extension and retraction is not welcomed by most users and needs to be improved.

Therefore, the purpose of the present invention is to provide a multi-section cylinder and a flow path control method thereof to solve the problems of the prior art.

The technical means adopted by the present invention to solve the problems of the prior art is to provide a multi-section cylinder, comprising: a base cylinder body; at least one extension cylinder body, which is sleeved in a base cylinder chamber of the base cylinder body in a manner that the outer diameter surface of the extension cylinder body corresponds to the inner diameter surface of the base cylinder body, so that the extension cylinder body can be longitudinally extended and retracted relative to the base cylinder body, wherein the extension cylinder body has a longitudinal through-hole and a transverse through-hole, wherein the longitudinal through-hole longitudinally penetrates the extension cylinder body from one of the extension cylinder chambers of the extension cylinder body and is connected to the base cylinder chamber of the base cylinder body, and the transverse through-hole transversely penetrates the extension cylinder chamber of the extension cylinder body and is connected to the extension cylinder body. A base cylinder sleeve gap is provided between the inner diameter surface of the base cylinder and the outer diameter surface of the extension cylinder; and an actuating shaft is sleeved in the extension cylinder chamber of the extension cylinder in a manner that the outer diameter surface of the actuating shaft corresponds to the inner diameter surface of the extension cylinder, so that the actuating shaft can be longitudinally extended and retracted relative to the extension cylinder, wherein the actuating shaft is provided with a fluid inlet and a fluid outlet, and an inflow flow path and an outflow flow path that do not intersect each other are formed in the actuating shaft, one end of the inflow flow path is connected to the fluid inlet, and the other end of the inflow flow path extends longitudinally to the actuating shaft and passes through a longitudinal connection of the actuating shaft longitudinally. The inlet of the fluid inlet is connected to the extension cylinder chamber of the extension cylinder body, one end of the outflow flow path is connected to the fluid outlet, and the other end of the outflow flow path extends longitudinally to the actuating shaft and is connected to a consistent actuating shaft sleeve gap between the outer diameter surface of the actuating shaft and the inner diameter surface of the extension cylinder body through a transverse communication port that transversely penetrates the actuating shaft. When a pressurized fluid is input from the fluid inlet, the pressurized fluid flows into the extension cylinder chamber of the extension cylinder body through the inflow flow path and the longitudinal communication port, and further flows into the base cylinder chamber of the base cylinder body through the longitudinal penetration port, and the extension cylinder body and the actuating shaft are pushed by the fluid pressure. The multi-section cylinder is extended forwardly by a longitudinal extension action, and when the actuating axis of the multi-section cylinder is subjected to a backward external force, the pressurized fluid in the extension cylinder chamber of the extension cylinder body is pressurized to flow out from the fluid outlet through the actuating axis sleeve gap, the transverse communication port and the outflow path, and the pressurized fluid in the base cylinder chamber of the base cylinder body is pressurized to flow out from the fluid outlet through the base cylinder sleeve gap, the transverse penetration port, the actuating axis sleeve gap, the transverse communication port and the outflow path, and the actuating axis and the extension cylinder body are longitudinally retracted backwardly by pressure relief, so that the multi-section cylinder is retracted.

In one embodiment of the present invention, a multi-section cylinder is provided, wherein the multi-section cylinder includes a plurality of extension cylinder bodies, which are sequentially arranged from the outside to the inside, wherein: the extension cylinder body located on the outermost side is arranged in the base cylinder chamber of the base cylinder body; in the two extension cylinder bodies arranged in the same way, the extension cylinder body located on the relatively inner side is arranged in the extension cylinder chamber of the extension cylinder body located on the relatively outer side in such a way that the outer diameter surface of the extension cylinder body located on the relatively inner side corresponds to the inner diameter surface of the extension cylinder body located on the relatively outer side, and the extension cylinder body located on the relatively inner side is arranged in the extension cylinder chamber of the extension cylinder body located on the relatively outer side. The longitudinal penetration opening of the extension cylinder body on the relatively inner side longitudinally penetrates the extension cylinder body located on the relatively inner side and is connected to the extension cylinder chamber of the extension cylinder body located on the relatively outer side, and the transverse penetration opening of the extension cylinder body located on the relatively inner side transversely penetrates the extension cylinder body located on the relatively inner side and is connected to an extension cylinder sleeve gap between the inner diameter surface of the extension cylinder body located on the relatively outer side and the outer diameter surface of the extension cylinder body located on the relatively inner side; the actuating shaft is sleeved in the extension cylinder chamber of the extension cylinder body located on the innermost side.

In one embodiment of the present invention, a multi-section cylinder is provided, wherein the inlet flow path and the outlet flow path are each a cavity of the actuating shaft, extending longitudinally in parallel and formed in the actuating shaft.

In one embodiment of the present invention, a multi-section cylinder is provided, wherein the inlet flow path and the outlet flow path are formed in the actuating axis by extending longitudinally in a tube-in-tube structure.

In one embodiment of the present invention, a multi-section cylinder is provided, wherein the outflow path is an outer cavity extending in the actuating shaft, and the inflow path is an inner cavity extending in the outer cavity and surrounded by the outer cavity, thereby forming the tube-in-tube structure.

In one embodiment of the present invention, a multi-section cylinder is provided, wherein the longitudinal communication port of the actuating axis and the longitudinal penetration port of each of the extension cylinder bodies are arranged on the same axis.

In one embodiment of the present invention, a multi-section cylinder is provided, wherein the opening area of the longitudinal through-hole of each extension cylinder body is larger than the opening area of the longitudinal communication port of the actuating axis, and the opening area of the longitudinal through-hole of the extension cylinder body located on the relatively outer side is larger than the opening area of the longitudinal through-hole of the extension cylinder body located on the relatively inner side.

In one embodiment of the present invention, a multi-section cylinder is provided, wherein the pressurized fluid is hydraulic oil and the multi-section cylinder is a hydraulic multi-section cylinder.

The present invention also provides a flow path control method for a multi-section cylinder, comprising the following steps: a setting step, providing the multi-section cylinder as described above, setting the base cylinder body of the multi-section cylinder on a fixed seat, setting an actuator on the actuating axis of the multi-section cylinder, connecting a pressurized fluid source to the fluid inlet of the multi-section cylinder via an inlet control valve, and setting an outlet control valve to connect to the fluid outlet of the multi-section cylinder; an extension step, after the setting step, opening the inlet control valve, and inputting the pressurized fluid from the pressurized fluid source to the fluid inlet, so that the pressurized fluid flows into the base cylinder chamber and the base cylinder body of the base cylinder through the inlet flow path, the longitudinal connecting port, and the longitudinal through-port. The extension cylinder chamber of the extension cylinder body pushes the extension cylinder body and the actuating shaft to extend forward longitudinally by fluid pressure, so that the actuator moves forward longitudinally relative to the fixed seat; and a retraction step, after the setting step, when the actuator is subjected to a backward external force, the outlet control valve is opened, so that the base cylinder chamber of the base cylinder body and the The pressurized fluid in the extension cylinder chamber of the extension cylinder flows out from the fluid outlet through the slit of the base cylinder sleeve, the transverse through-hole, the slit of the actuating shaft sleeve, the transverse communication port and the outflow flow path, and the actuating shaft and the extension cylinder are longitudinally retracted and actuated by the pressure relief, so that the actuator is longitudinally displaced backward relative to the fixed seat.

In one embodiment of the present invention, a flow path control method of a multi-section cylinder is provided, wherein in the setting step, the fixing seat is a compartment of a garbage truck, and the actuator is a shovel of the garbage truck.

Through the technical means adopted by the present invention, the multi-section cylinder of the present invention can be extended by inputting pressurized fluid from a single fluid inlet. Moreover, when the multi-section cylinder is converted from the extended state to the retracted state, the multi-section cylinder of the present invention does not need to input pressurized fluid for reverse thrust, nor does it need to withdraw pressurized fluid from the fluid inlet to generate a pull-back force, and the control is very simple. The multi-section cylinder of the present invention is suitable for situations where only one-way control is required, and can effectively avoid complex fluid pressure control, so it is more convenient to be applied in a mechanism that only needs to achieve a simple extension and retraction action.

The following describes the implementation of the present invention based on Figures 1 to 7. The description is not intended to limit the implementation of the present invention, but is an example of the present invention.

As shown in FIGS. 1 to 5 , a multi-section cylinder 100 according to an embodiment of the present invention comprises: a base cylinder body 1, at least one extension cylinder body 2, and an actuating axis 3.

As shown in Figures 1 to 5, the base cylinder body 1 is an outer tube of the multi-section cylinder 100 and is located at the outermost side of the multi-section cylinder 100. The base cylinder body 1 has a base cylinder chamber 10 for accommodating pressurized fluid.

As shown in FIGS. 1 to 5, the extension cylinder 2 is sleeved in the base cylinder chamber 10 of the base cylinder 1 in such a manner that the outer diameter of the extension cylinder 2 corresponds to the inner diameter of the base cylinder 1, so that the extension cylinder 2 can be longitudinally extended and retracted relative to the base cylinder 1, wherein the extension cylinder 2 has a longitudinal through-hole 201 and a transverse through-hole 202. The through hole 201 penetrates the extension cylinder body 2 longitudinally from an extension cylinder chamber 20 of the extension cylinder body 2 and is connected to the base cylinder chamber 10 of the base cylinder body 1. The transverse through hole 202 penetrates the extension cylinder body 2 transversely from the extension cylinder chamber 20 of the extension cylinder body 2 and is connected to a base cylinder sleeve gap G1 between the inner diameter surface of the base cylinder body 1 and the outer diameter surface of the extension cylinder body 2.

As shown in FIGS. 1 to 5 , the actuating shaft 3 is sleeved in the extension cylinder chamber 20 of the extension cylinder 2 in such a manner that the outer diameter surface of the actuating shaft 3 corresponds to the inner diameter surface of the extension cylinder 2, so that the actuating shaft 3 can be longitudinally extended and retracted relative to the extension cylinder 2, wherein the actuating shaft 3 is provided with a fluid inlet A and a fluid outlet B, and an inflow flow path P1 and an outflow flow path P2 that do not intersect with each other are formed in the actuating shaft, one end of the inflow flow path P1 is connected to the fluid inlet A, The other end of the inflow channel P1 extends longitudinally to the actuating shaft 3 and is connected to the extension cylinder chamber 20 of the extension cylinder body 2 through a longitudinal connecting port 301 that longitudinally penetrates the actuating shaft. One end of the outflow channel P2 is connected to the fluid outlet B. The other end of the outflow channel P2 extends longitudinally to the actuating shaft 3 and is connected to an actuating shaft sleeve gap G3 between the outer diameter surface of the actuating shaft 3 and the inner diameter surface of the extension cylinder body through a transverse connecting port 302 that transversely penetrates the actuating shaft 3.

As shown in Figures 2a to 5, in the multi-section cylinder 100, when a pressurized fluid is input from the fluid inlet A, the pressurized fluid flows into the extension cylinder chamber 20 of the extension cylinder body 2 through the inlet flow path P1 and the longitudinal connecting port 301, and further flows into the base cylinder chamber 10 of the base cylinder body 1 through the longitudinal through-port 201, and the extension cylinder body 2 and the actuating shaft 3 are pushed longitudinally forward by the fluid pressure, so that the multi-section cylinder 100 becomes an extended state (Figure 5).

When the actuating shaft 3 of the multi-section cylinder 100 is subjected to a backward external force, the pressurized fluid in the extension cylinder chamber 20 of the extension cylinder body 2 is pressurized and flows out from the fluid outlet B through the actuating shaft sleeve gap G3, the transverse communication port 302 and the outflow flow path P2, and the pressurized fluid in the base cylinder chamber 10 of the base cylinder body 1 is pressurized. The fluid flows out from the fluid outlet B through the base cylinder sleeve gap G1, the transverse through-hole 202, the actuating shaft sleeve gap G3, the transverse connecting hole 302 and the outflow passage P2, and the actuating shaft 3 and the extension cylinder 2 are longitudinally retracted backward by the pressure relief, so that the multi-section cylinder 100 is in the retracted state (Figure 2a, Figure 2b).

Preferably, as shown in FIGS. 1 to 5, in the multi-section cylinder 100 of the embodiment of the present invention, the multi-section cylinder 100 includes a plurality of extension cylinder bodies 2, which are mutually sleeved in sequence from the outside to the inside (in the present embodiment, there are two extension cylinder bodies 2, namely, the extension cylinder body 2a located on the outside and the extension cylinder body 2b located on the inside), wherein: the extension cylinder body 2a located on the outermost side is sleeved in the base cylinder chamber 10 of the base cylinder body 1; in the two mutually sleeved extension cylinder bodies 2a and 2b, the extension cylinder body 2b located on the relatively inner side is sleeved in the extension cylinder body 2b located on the relatively outer side in such a manner that the outer diameter surface of the extension cylinder body 2b located on the relatively inner side corresponds to the inner diameter surface of the extension cylinder body 2a located on the relatively outer side. The longitudinal through hole 201 of the extension cylinder 2b located on the relatively inner side is located in the extension cylinder chamber 20 of the extension cylinder 2a on the relatively outer side, and longitudinally penetrates the extension cylinder 2b located on the relatively inner side and is connected to the extension cylinder chamber 20 of the extension cylinder 2a located on the relatively outer side, and the transverse through hole 201 of the extension cylinder 2b located on the relatively inner side is located in the extension cylinder chamber 20 of the extension cylinder 2a located on the relatively outer side. The through opening 202 penetrates the extension cylinder 2b located on the relatively inner side transversely and is connected to an extension cylinder sleeve gap G2 between the inner diameter surface of the extension cylinder 2a located on the relatively outer side and the outer diameter surface of the extension cylinder 2b located on the relatively inner side; the actuating shaft 3 is sleeved in the extension cylinder chamber 20 of the extension cylinder 2b located on the innermost side.

As shown in FIG. 2a, in another embodiment of the multi-section cylinder 100 of the present invention, the inflow passage P1 and the outflow passage P2 are formed in the actuating shaft 3 by extending longitudinally in a manner of forming a tube-in-tube structure. Preferably, the outflow passage P2 is an outer cavity extending in the actuating shaft 3, and the inflow passage P1 is an inner cavity extending in the outer cavity and surrounded by the outer cavity, thereby forming the tube-in-tube structure.

As shown in FIG. 2b, in a multi-section cylinder 100a of an embodiment of the present invention, the inflow passage P1 and the outflow passage P2 are each a cavity of the actuating shaft 3, and are formed in parallel and longitudinally extending in the actuating shaft 3. Compared with the multi-section cylinder 100 of the embodiment of FIG. 2a, the inflow passage P1 and the outflow passage P2 in the multi-section cylinder 100a of the embodiment of FIG. 2b are arranged in parallel, and the rigidity of the actuating shaft 3 is better, and it is more suitable for use in the case of a heavy structure.

Preferably, as shown in FIG. 2a to FIG. 5, in the multi-section cylinder 100 of the embodiment of the present invention, the longitudinal communication port 301 of the actuating shaft 3 and the longitudinal penetration port 201 of each of the extension cylinder bodies 2 are arranged on the same axis. The coaxial arrangement makes it easier for the input pressurized fluid to flow into the base cylinder chamber 10 and each of the extension cylinder chambers 20, which helps to transmit the fluid pressure.

Preferably, as shown in Figures 2a to 5, in the multi-section cylinder 100 of the embodiment of the present invention, the opening area of the longitudinal through-hole 201 of each extension cylinder body 2 is larger than the opening area of the longitudinal communication hole 301 of the actuating shaft 3, and the opening area of the longitudinal through-hole 201 of the extension cylinder body 2a located on the relatively outer side is larger than the opening area of the longitudinal through-hole 201 of the extension cylinder body 2b located on the relatively inner side. The size of the opening area can be used to determine the effective area of the pressurized fluid, thereby adjusting the sequential extension or retraction of each extension cylinder body 2 and the actuating shaft 3 during the extension and retraction of the multi-section cylinder 100.

In addition, in the multi-section cylinder 100 of the embodiment of the present invention, the pressurized fluid is hydraulic oil, and the multi-section cylinder 100 is a hydraulic multi-section cylinder.

Next, the flow path control method of a multi-section cylinder according to an embodiment of the present invention will be described as follows with reference to FIGS. 6 and 7 in conjunction with FIGS. 1 to 5.

As shown in FIG. 6 , the flow path control method of the multi-section cylinder of the embodiment of the present invention includes: a setting step S1, an extension step S2, and a retraction step S3.

In the setting step S1, the multi-section cylinder 100 of the present invention is provided, the base cylinder body 1 of the multi-section cylinder 100 is set on a fixed seat C1 (Figure 7), an actuator C2 (Figure 7) is set on the actuating shaft 3 of the multi-section cylinder 100, a pressurized fluid source (not shown) is connected to the fluid inlet A of the multi-section cylinder 100 through an inlet control valve (not shown), and an outlet control valve (not shown) is set and connected to the fluid outlet B of the multi-section cylinder 100. As shown in Figure 7, in this embodiment, the fixed seat C1 is a compartment of a garbage truck C, and the actuator C2 is a shovel of the garbage truck C.

Next, in the extension step S2 after the setting step S1, the inlet control valve is opened, and the pressurized fluid is input from the pressurized fluid source to the fluid inlet A, so that the pressurized fluid flows into the base cylinder chamber 10 of the base cylinder 1 and the extension cylinder chamber 20 of the extension cylinder 2 through the inlet flow path P1, the longitudinal connecting port 301, and the longitudinal through-port 201, and the extension cylinder 2 and the actuating shaft 3 are pushed longitudinally forward by the fluid pressure, so that the actuator C2 is displaced longitudinally forward relative to the fixed seat C1.

Specifically, when the pressurized fluid is input from the fluid inlet A, the pressurized fluid will flow into the extension cylinder chamber 20 of the extension cylinder 2b through the inlet flow path P1 and the longitudinal connecting port 301 in sequence, and then flow into the extension cylinder chamber 20 of the extension cylinder 2a through the longitudinal through-port 201 of the extension cylinder 2b, and then flow into the base cylinder chamber 10 of the base cylinder 1 through the longitudinal through-port 201 of the extension cylinder 2a.

With the input of the pressurized fluid, and due to the relationship between the effective area and the magnitude of the force, as shown in FIG. 3 , the pressurized fluid in the base cylinder chamber 10 will push the piston 22 at the rear end of the extension cylinder 2a, causing the extension cylinder 2a, together with the extension cylinder 2b and the actuating axis 3, to extend forward longitudinally relative to the base cylinder 1 until the piston 22 of the extension cylinder 2a hits the front cover 11 at the front end of the base cylinder 1.

Next, as shown in FIG. 4 , the pressurized fluid in the extension cylinder chamber 20 of the extension cylinder 2a pushes the piston 22 at the rear end of the extension cylinder 2b, causing the extension cylinder 2b and the actuating shaft 3 to extend longitudinally forward relative to the extension cylinder 2a until the piston 22 of the extension cylinder 2b hits the front cover 21 at the front end of the extension cylinder 2a.

Next, as shown in FIG. 5 , the pressurized fluid in the extension cylinder chamber 20 of the extension cylinder 2b pushes the piston 31 at the rear end of the actuating shaft 3, so that the actuating shaft 3 extends forward longitudinally relative to the extension cylinder 2b until the piston 31 of the actuating shaft 3 hits the front cover 21 at the front end of the extension cylinder 2b. At this time, the multi-section cylinder 100 is in an extended state, so that the actuator C2 is displaced longitudinally forward relative to the fixing seat C1. In this embodiment, the actuator C2 can perform operations such as pushing and compressing garbage in the garbage truck C.

In the retracting step S3 after the setting step S1, the outlet control valve is opened when the actuator C2 is subjected to a backward external force, so that the pressurized fluid in the base cylinder chamber 10 of the base cylinder body 1 and the extension cylinder chamber 20 of the extension cylinder body 2 flows out from the fluid outlet B through the base cylinder body sleeve gap G1, the transverse through-hole 202, the actuating shaft sleeve gap G3, the transverse connecting port 302 and the outflow path P2, and the actuating shaft 3 and the extension cylinder body 2 are longitudinally retracted by the pressure relief, so that the actuator C2 is longitudinally displaced backward relative to the fixed seat C1.

Specifically, in this embodiment, the external backward force applied to the actuator C2 is, for example, the thrust caused by the squeezing of garbage when the garbage truck C collects garbage. When subjected to a backward external force, the piston 31 of the actuating shaft 3 and the pistons of the extension cylinders 2a and 2b will be squeezed backward, causing the pressure in the base cylinder chamber 10 and the extension cylinder chamber 20 to increase, forcing the pressurized fluid in the extension cylinder chamber 20 of the extension cylinder 2b to flow out from the fluid outlet B through the gap G3 of the actuating shaft sleeve, the transverse connecting port 302, and the outflow path P2 in sequence, and the pressurized fluid in the extension cylinder chamber 20 of the extension cylinder 2a will flow out from the fluid outlet B through the gap G2 of the extension cylinder sleeve, the transverse through-port 202 of the extension cylinder 2b, and the extension cylinder chamber of the extension cylinder 2b in sequence. 20, the actuating shaft sleeve is provided with a gap G3, the transverse communication port 302, and the outflow path P2 to flow out from the fluid outlet B, and the pressurized fluid in the base cylinder chamber 10 of the base cylinder body 1 flows out from the fluid outlet B in sequence through the base cylinder sleeve gap G1, the transverse penetration port 202 of the extension cylinder body 2a, the extension cylinder chamber 20 of the extension cylinder body 2a, the extension cylinder sleeve gap G2, the transverse penetration port 202 of the extension cylinder body 2b, the extension cylinder chamber 20 of the extension cylinder body 2b, the actuating shaft sleeve gap G3, the transverse communication port 302, and the outflow path P2.

As the pressurized fluid flows out, and due to the relationship between the piston action area and the resistance, as shown in FIG. 4, the actuating shaft 3 will retract longitudinally relative to the extension cylinder 2b and retreat to the extension cylinder chamber 20 of the extension cylinder 2b. Then, as shown in FIG. 3, the actuating shaft 3 also retracts longitudinally relative to the extension cylinder 2a, so that the extension cylinder 2b retreats to the extension cylinder chamber 20 of the extension cylinder 2a. Then, as shown in FIG. 2a, the actuating shaft 3 also retracts longitudinally relative to the extension cylinder 2b and the extension cylinder 2a relative to the base cylinder 1, so that the extension cylinder 2a retreats to the base cylinder chamber 10 of the base cylinder 1. At this time, the multi-section cylinder 100 is in a retracted state, and during the entire process of executing the retracting step S3, there is no need to actively control the pressurized fluid.

It should be noted that, although in the above embodiment, the extending step S2 is described first and then the retracting step S3 is described after the setting step S1, the execution order is not limited to this. In other embodiments, the retracting step S3 may be performed first and then the extending step S2 after the setting step S1, depending on whether the multi-section cylinder 100 is in an extended state, a retracted state, or an intermediate state between the two after the setting step S1 is performed.

By means of the above technical means, the multi-section cylinder 100, 100a of the present invention can be put into an extended state by inputting a pressurized fluid from a single fluid inlet A. Furthermore, when the multi-section cylinder 100, 100a is converted from the extended state to the retracted state, the multi-section cylinder 100, 100a of the present invention does not need to input a pressurized fluid for reverse thrust, nor does it need to withdraw the pressurized fluid from the fluid inlet A to generate a pull-back force, and is very simple to control. The multi-section cylinder 100, 100a of the present invention is suitable for situations where only one-way control is required, and can effectively avoid complex fluid pressure control, so that it is more convenient to be applied in a mechanism that only needs to achieve a simple extension and retraction action.

The above description and explanation are only the description of the preferred embodiment of the present invention. Those with ordinary knowledge in this technology can make other modifications according to the scope of the patent application defined below and the above description. However, these modifications should still be within the spirit of the present invention and within the scope of the rights of the present invention.

100: Multi-section cylinder 100a: Multi-section cylinder 1: Base cylinder 10: Base cylinder chamber 11: Front cover 2: Extension cylinder 2a: Extension cylinder 2b: Extension cylinder 20: Extension cylinder chamber 201: Longitudinal penetration port 202: Horizontal penetration port 21: Front cover 22: Piston 3: Actuating shaft 301: Longitudinal connection port 302: Horizontal connection port 31: Piston A: Fluid inlet B: Fluid outlet C: Garbage truck C1: Fixed seat C2: Actuator G1: Base cylinder sleeve gap G2: Extension cylinder sleeve gap G3: Actuating shaft sleeve gap P1: Inflow path P2: Outflow path S1: Setting step S2: Extending step S3: Retracting step

[Figure 1] is a three-dimensional schematic diagram showing a multi-section cylinder according to an embodiment of the present invention; [Figure 2a] is a cross-sectional schematic diagram showing a multi-section cylinder according to an embodiment of the present invention; [Figure 2b] is a cross-sectional schematic diagram showing a multi-section cylinder according to another embodiment of the present invention; [Figure 3] is a cross-sectional schematic diagram showing a multi-section cylinder according to an embodiment of the present invention during extension and contraction; [Figure 4] is a cross-sectional schematic diagram showing a multi-section cylinder according to an embodiment of the present invention during extension and contraction; [Figure 5] is a cross-sectional schematic diagram showing a multi-section cylinder according to an embodiment of the present invention during extension and contraction; [Figure 6] is a flow chart showing a flow path control method of a multi-section cylinder according to an embodiment of the present invention; [Figure 7] is a schematic diagram showing the multi-section cylinder according to an embodiment of the present invention being applied to a shovel of a garbage truck.

100:Multi-section cylinder

1: Base cylinder

10: Base cylinder chamber

11: Front cover

2: Extend the cylinder

2a: Extended cylinder

2b: Extended cylinder

20: Extension cylinder chamber

201: Longitudinal penetration

202: Horizontal penetration

21: Front cover

22: Piston

3: Actuating shaft

301: Longitudinal connection port

302: Horizontal connection port

31: Piston

A: Fluid inlet

B: Fluid outlet

G1: Gap between base and cylinder sleeve

G2: Extend the cylinder sleeve to create a gap

G3: Actuator shaft sleeve gap

P1: Inflow path

P2: Outflow path

Claims (10)

A multi-section cylinder, comprising: a base cylinder body; at least one extension cylinder body, which is sleeved in a base cylinder chamber of the base cylinder body in a manner that the outer diameter surface of the extension cylinder body corresponds to the inner diameter surface of the base cylinder body, so that the extension cylinder body can be longitudinally extended and retracted relative to the base cylinder body, wherein the extension cylinder body has a longitudinal through-hole and a transverse through-hole, wherein the longitudinal through-hole longitudinally penetrates the extension cylinder body from an extension cylinder chamber of the extension cylinder body and is connected to the base cylinder chamber of the base cylinder body, and the transverse through-hole transversely penetrates the extension cylinder body from the extension cylinder chamber of the extension cylinder body and is connected to a base cylinder sleeve gap between the inner diameter surface of the base cylinder body and the outer diameter surface of the extension cylinder body; and An actuating shaft is sleeved in the extension cylinder chamber of the extension cylinder in such a manner that the outer diameter surface of the actuating shaft corresponds to the inner diameter surface of the extension cylinder, so that the actuating shaft can be longitudinally extended and retracted relative to the extension cylinder, wherein the actuating shaft is provided with a fluid inlet and a fluid outlet, and an inflow flow path and an outflow flow path that do not intersect each other are formed in the actuating shaft, one end of the inflow flow path is connected to the fluid inlet, and the inflow flow path is connected to the fluid inlet. The other end of the inflow channel extends longitudinally to the actuating shaft and is connected to the extension cylinder chamber of the extension cylinder body through a longitudinal communication port that longitudinally penetrates the actuating shaft. One end of the outflow channel is connected to the fluid outlet. The other end of the outflow channel extends longitudinally to the actuating shaft and is connected to a consistent actuating shaft sleeve gap between the outer diameter surface of the actuating shaft and the inner diameter surface of the extension cylinder body through a transverse communication port that transversely penetrates the actuating shaft. Wherein, When a pressurized fluid is input from the fluid inlet, the pressurized fluid flows into the extension cylinder chamber of the extension cylinder through the inflow passage and the longitudinal communication port and further flows into the base cylinder chamber of the base cylinder through the longitudinal penetration port, and the extension cylinder and the actuating axis are pushed forward longitudinally by the fluid pressure, so that the multi-section cylinder becomes an extended state, and When the actuating shaft of the multi-section cylinder is subjected to a backward external force, the pressurized fluid in the extension cylinder chamber of the extension cylinder body is pressurized to flow out from the fluid outlet through the actuating shaft sleeve gap, the transverse communication port and the outflow path, and the pressurized fluid in the base cylinder chamber of the base cylinder body is pressurized to flow out from the fluid outlet through the base cylinder sleeve gap, the transverse penetration port, the actuating shaft sleeve gap, the transverse communication port and the outflow path, and the actuating shaft and the extension cylinder body are longitudinally retracted backward by the pressure relief, so that the multi-section cylinder is in a retracted state. A multi-section cylinder as described in claim 1, wherein the multi-section cylinder comprises a plurality of extension cylinder bodies which are mutually nested in sequence from the outside to the inside, wherein: The extension cylinder body located on the outermost side is nested in the base cylinder chamber of the base cylinder body; Among the two mutually nested extension cylinder bodies, the extension cylinder body located on the relatively inner side is nested in the extension cylinder chamber of the extension cylinder body located on the relatively outer side in such a manner that the outer diameter surface of the extension cylinder body located on the relatively inner side corresponds to the inner diameter surface of the extension cylinder body located on the relatively outer side, and the longitudinal penetration opening of the extension cylinder body located on the relatively inner side longitudinally penetrates the extension cylinder body located on the relatively inner side. The extension cylinder on the inner side is connected to the extension cylinder chamber of the extension cylinder located on the opposite outer side. The transverse penetration opening of the extension cylinder located on the opposite inner side transversely penetrates the extension cylinder located on the opposite inner side and is connected to an extension cylinder sleeve gap between the inner diameter surface of the extension cylinder located on the opposite outer side and the outer diameter surface of the extension cylinder located on the opposite inner side; The actuating shaft is sleeved in the extension cylinder chamber of the extension cylinder located on the innermost side. In the multi-section cylinder as described in claim 1 or 2, the inlet flow path and the outlet flow path are each a cavity of the actuating shaft, extending longitudinally in parallel to be formed in the actuating shaft. A multi-section cylinder as described in claim 1 or 2, wherein the inlet flow path and the outlet flow path are formed by extending longitudinally in the actuating axis in a manner of forming a tube-in-tube structure. A multi-section cylinder as described in claim 4, wherein the outflow path is an outer cavity extending in the actuating shaft, and the inflow path is an inner cavity extending in the outer cavity and surrounded by the outer cavity, thereby forming the tube-in-tube structure. A multi-section cylinder as described in claim 1 or 2, wherein the longitudinal communication opening of the actuating axis and the longitudinal penetration opening of each of the extension cylinder bodies are arranged on the same axis. A multi-section cylinder as described in claim 1 or 2, wherein the opening area of the longitudinal through-hole of each extension cylinder body is larger than the opening area of the longitudinal connecting hole of the actuating axis, and the opening area of the longitudinal through-hole of the extension cylinder body located on the relatively outer side is larger than the opening area of the longitudinal through-hole of the extension cylinder body located on the relatively inner side. A multi-section cylinder as described in claim 1, wherein the pressurized fluid is hydraulic oil and the multi-section cylinder is a hydraulic multi-section cylinder. A method for controlling the flow path of a multi-section cylinder comprises the following steps: A setting step, providing a multi-section cylinder as described in any one of claims 1 to 8, setting the base cylinder body of the multi-section cylinder on a fixed seat, setting an actuator on the actuating axis of the multi-section cylinder, connecting a pressurized fluid source to the fluid inlet of the multi-section cylinder via an inlet control valve, and setting an outlet control valve to connect to the fluid outlet of the multi-section cylinder; An extension step, after the setting step, the inlet control valve is opened, and the pressurized fluid is input from the pressurized fluid source to the fluid inlet, so that the pressurized fluid flows into the base cylinder chamber of the base cylinder body and the extension cylinder chamber of the extension cylinder body through the inlet flow path, the longitudinal communication port, and the longitudinal through-port, and the extension cylinder body and the actuating axis are pushed forward longitudinally by the fluid pressure, so that the actuator is displaced longitudinally forward relative to the fixed seat; and A retraction step, after the setting step, when the actuator is subjected to a backward external force, the outlet control valve is opened, so that the pressurized fluid in the base cylinder chamber of the base cylinder body and the extension cylinder chamber of the extension cylinder body flows out from the fluid outlet through the slit of the base cylinder body sleeve, the transverse through-hole, the slit of the actuating shaft sleeve, the transverse communication port and the outflow flow path, and the actuating shaft and the extension cylinder body are longitudinally retracted by the pressure relief, so that the actuator is longitudinally displaced backward relative to the fixed seat. A flow control method for a multi-section cylinder as described in claim 9, wherein in the setting step, the fixed seat is a compartment of a garbage truck, and the actuator is a shovel of the garbage truck.

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