TWI831471B - Double-acting multi-section cylinder with extension cushion function - Google Patents

Abstract

Disclosed is a double-acting multi-section cylinder with an extension cushion function, comprising an outer cylinder member, at least one tubular shaft member and an inner shaft member, wherein during a tubular shaft extension cushion stroke of the longitudinal extension of the tubular shaft member relative to the outer cylinder member, the flow rate of a driving fluid is reduced by reducing the overall flow path cross-sectional area of a tubular shaft external connecting hole which allows the driving fluid to flow out of an outer cylinder front chamber, thereby reducing an extension speed of the tubular shaft member.

Description

Double-acting multi-section cylinder with extended buffer

The present invention relates to a double-acting cylinder, and in particular to a double-acting multi-section cylinder with extended buffer.

A double-acting cylinder is a cylinder in which the driving fluid acts on both sides of the piston alternately. By causing the driving fluid to act on one side of the piston, the piston rod can be extended and actuated. By causing the driving fluid to act on one side of the piston, the piston rod can be extended. The other side of the piston allows the piston rod to retract. Double-acting cylinders are mainly used in situations where external force cannot be used to retract the piston rod, and can also be used in situations where higher force is required in both extending and retracting directions.

Due to the large force of the driving fluid, the piston rod is prone to violently hit the front end of the cylinder due to inertia when it extends to the end of the movement. In severe cases, it may even be damaged, so there is a need for improvement.

Therefore, the object of the present invention is to provide a double-acting multi-section cylinder with extension buffer to solve the problems of the conventional technology.

The technical means adopted by the present invention to solve the problems of the conventional technology is to provide a double-acting multi-section cylinder with extension buffer, which includes: an outer cylinder member; at least one tube shaft member, the outer diameter of the tube shaft member is The surface is longitudinally slidably sleeved in the outer cylinder member in a manner corresponding to the inner diameter surface of the outer cylinder member, and a rear cylinder chamber of the outer cylinder and a front cylinder chamber of the outer cylinder are formed in the outer cylinder component. , the rear side cylinder chamber of the outer cylinder is located between the rear end surface of the tube shaft member and the outer cylinder member, and the front side cylinder chamber of the outer cylinder is located between the outer diameter surface of the tube shaft member and the inner diameter of the outer cylinder member Between the surfaces, the tube wall of the tube shaft member forms a front side inter-cylinder chamber flow channel, and one end of the front side inter-cylinder chamber flow channel is connected to the front side cylinder chamber of the outer cylinder through a tube shaft outer diameter communication hole, and the front side The other end of the inter-cylinder flow channel is connected to the inner diameter surface of the tube shaft member; and an axis member slides longitudinally in such a manner that the outer diameter surface of the axis member corresponds to the inner diameter surface of the tube shaft member is sleeved in the tube shaft member, and a tube shaft rear side cylinder chamber and a tube shaft front side cylinder chamber are formed in the tube shaft member, and the tube shaft rear side cylinder chamber is located behind the axis member Between the end surface and the tube shaft member and connected to the rear side cylinder chamber of the outer cylinder, the tube shaft front side cylinder chamber is located between the outer diameter surface of the axis member and the inner diameter surface of the tube shaft member, and is connected via The flow channel between the front cylinder chambers is connected to the front cylinder chamber of the outer cylinder, wherein the axis member is provided with a first fluid inlet and outlet and a second fluid inlet and outlet, and a non-intersecting one is formed in the axis member. There is a first inlet and outlet flow channel and a second inlet and outlet flow channel. One end of the first inlet and outlet flow channel is connected to the first fluid inlet and outlet, and the other end of the first inlet and outlet flow channel is connected to the cylinder chamber behind the tube shaft. One end of the second inlet and outlet flow channel is connected to the second fluid inlet and outlet, and the other end of the second inlet and outlet flow channel is connected to the cylinder chamber on the front side of the tube shaft through an axis outer diameter communication hole, so as to transfer the first fluid from the When a driving fluid is input into the inlet and outlet, the driving fluid flows into the rear side cylinder chamber of the tube shaft and the rear side cylinder chamber of the outer cylinder through the first inlet and outlet flow channel, and pushes the tube shaft member and the axis member forward, At the same time, the driving fluid in the front cylinder chamber of the outer cylinder passes through the tube shaft outer diameter communication hole, the front cylinder inter-chamber flow channel, the tube shaft front cylinder chamber, the axis outer diameter communication hole and the second inlet and outlet flow. channel and flows through the second fluid inlet and outlet out, so that the double-acting multi-section cylinder extends forward longitudinally, wherein the tube shaft outer diameter communication hole includes a tube shaft normal hole portion and a tube shaft shielded hole portion, and the tube shaft shielded hole portion is located The outer cylinder member is provided with a pipe shaft through hole shielding portion at the relative longitudinal front of the normal through hole portion of the pipe shaft, and the pipe shaft shielded hole portion slides corresponding to the pipe shaft through hole shielding portion to prevent the double-action When the multi-section cylinder extends forward longitudinally, the tube shaft member is extended longitudinally relative to the outer cylinder member through a tube shaft normal speed extension stroke and a tube shaft buffer extension stroke in sequence, and the tube shaft is During the normal speed extension stroke, the normal hole portion of the tube shaft and the shielded hole portion of the tube shaft are both connected between the front side cylinder chamber of the outer cylinder and the flow channel between the front side cylinder chambers, so that the flow path between the front side cylinder chamber of the outer cylinder is The driving fluid passes through the outer diameter communication hole of the tube shaft and flows to the flow channel between the front cylinder chambers at a constant speed of the tube shaft. During the buffer extension stroke of the tube shaft, the shielded hole portion of the tube shaft slides relative to Being correspondingly shielded by the shielding portion of the tube shaft through hole of the outer cylinder member, the overall flow channel cross-sectional area of the tube shaft outer diameter communication hole is reduced, so that the driving fluid in the front cylinder chamber of the outer cylinder passes through the tube shaft outer diameter The communicating hole uses a tube shaft to buffer the extension flow and flows to the front side cylinder chamber flow channel. The tube shaft buffer extension flow is smaller than the tube shaft normal speed extension flow, thereby slowing down the extension speed of the tube shaft member.

In one embodiment of the present invention, a double-acting multi-section cylinder with extension buffer is provided, in which the cross-sectional area of the flow channel of the normal hole portion of the tube shaft is smaller than the cross-sectional area of the flow channel of the shielded hole portion of the tube shaft.

In one embodiment of the present invention, a double-acting multi-section cylinder with extension buffer is provided, wherein the tube shaft normal through hole portion includes a plurality of tube shaft normal through holes, and the tube shaft shielded hole portion includes a plurality of tube shaft receiving holes. Shielded holes, the number of through holes in the pipe shaft is usually less than the number of shielded holes in the pipe shaft.

In one embodiment of the present invention, a double-acting multi-section cylinder with extension buffer is provided, in which the tube shaft through hole shielding portion is formed on an outer cylinder member end cover of the outer cylinder member.

In one embodiment of the present invention, a double-acting multi-section cylinder with extension buffer is provided, in which the axis outer diameter communication hole includes an axis normal hole portion and an axis shielded hole portion. occluded hole department An axis through hole shielding portion is provided on the inner diameter surface of the tube shaft member at the relative longitudinal front of the axis normal through hole. The axis shielded hole portion slides corresponding to the axis through hole shielding portion. , so that when the double-acting multi-section cylinder extends forward longitudinally, the axis member moves longitudinally relative to the tube axis member through an axis normal speed extension stroke and an axis buffer extension stroke. During the extension stroke of the axis at normal speed, the normal hole portion of the axis and the shielded hole portion of the axis are connected between the cylinder chamber on the front side of the tube shaft and the second inlet and outlet flow channel, so that the The driving fluid in the cylinder chamber on the front side of the tube shaft flows to the second inlet and outlet flow channel at a constant speed of the axis through the axis outer diameter communication hole. When the axis buffers the extension stroke, the axis is blocked. The hole portion is correspondingly shielded by the axis through hole shielding portion of the tube shaft member through relative sliding, thereby reducing the overall flow channel cross-sectional area of the axis outer diameter communication hole, so that the driving fluid in the cylinder chamber on the front side of the tube axis Through the axis outer diameter communication hole, an axis buffer extension flow flows to the second inlet and outlet flow channel. The axis buffer extension flow is smaller than the axis normal speed extension flow, thereby slowing down the extension of the axis member. output speed.

In one embodiment of the present invention, a double-acting multi-section cylinder with extended buffering is provided, in which the cross-sectional area of the flow channel of the normal hole portion of the axis is smaller than the cross-sectional area of the flow path of the shielded hole portion of the axis.

In one embodiment of the present invention, a double-acting multi-section cylinder with extension buffer is provided, wherein the shaft center normal through hole portion includes a plurality of shaft center normal through holes, and the shaft center shielded hole portion includes a plurality of shaft center hole portions. The number of through holes in the axis is usually less than the number of blocked holes in the axis.

In one embodiment of the present invention, a double-acting multi-section cylinder with extension buffer is provided, wherein the axis through hole shielding portion is formed on a tube shaft end cover of the tube shaft member.

In one embodiment of the present invention, a double-acting multi-section cylinder with extended buffering is provided, in which the second inlet and outlet passage is formed as an outer cavity and longitudinally extended in the axis member, and the first inlet and outlet passage is formed in the axis member as an outer cavity passage. The flow channel is formed as an inner lumen longitudinally extending in the outer lumen and surrounded by the outer lumen, and a tube-in-tube structure is formed by the outer lumen and the inner lumen.

Through the technical means adopted in the present invention, the double-acting multi-section cylinder with extension buffer of the present invention can communicate with the outer cylinder by correspondingly shielding the tube shaft through-hole shielding portion when the tube shaft member extends longitudinally. The tube shaft outer diameter communication hole between the front side cylinder chamber and the front side cylinder chamber flow channel has a blocked hole portion of the tube shaft outer diameter, so that the tube shaft outer diameter communication hole changes from the original one including the tube shaft normal hole portion and the tube shaft outer diameter communication hole. The large flow channel cross-sectional area of the shielded hole portion of the tube shaft is reduced to the small flow channel cross-sectional area of the normal through-hole portion of the tube shaft, thereby reducing the outflow of the driving fluid from the front side cylinder chamber of the outer cylinder, thereby reducing the outflow of the driving fluid from the front cylinder chamber of the outer cylinder. The extension speed of the tube shaft member is slowed down to solve the problems of the conventional technology. Moreover, the double-acting multi-section cylinder with extension buffer of the present invention can effectively provide the function of extension buffer without the need for precise external flow control of the driving fluid, thereby making it more convenient to be used in various applications. in the institution.

100:Double-acting multi-section cylinder

1: Outer cylinder components

101: Rear side cylinder chamber of outer cylinder

102: Front side cylinder chamber of outer cylinder

11:Rear end wall

12:Front cover

14: Tube shaft through hole shielding part

2: Tube shaft component

201: Cylinder chamber behind tube shaft

202: Tube shaft front side cylinder chamber

203: Front side cylinder interchamber flow channel

21:Rear end wall

22:Front cover

23: Tube shaft outer diameter communication hole

231: Tube shaft normal hole part

232: The shielded hole part of the tube shaft

24: Axis through hole shielding part

3: Axis component

301: The first inlet and outlet channel

302: The second inlet and outlet channel

31: First fluid inlet and outlet

32: Second fluid inlet and outlet

33: Axis outer diameter communication hole

331: Axis center hole part

332: Shaft shielded hole part

[Fig. 1] is a three-dimensional schematic diagram showing a double-acting multi-section cylinder with extension buffer according to an embodiment of the present invention; [Fig. 2] is a schematic diagram showing a double-action multi-section cylinder with extension buffer according to an embodiment of the present invention. A schematic cross-sectional view of a multi-section cylinder; [Figure 3] is a schematic cross-sectional view showing a double-acting multi-section cylinder with extension buffer according to an embodiment of the present invention when it is extended; [Figure 4] is a schematic cross-section showing the double-acting multi-section cylinder according to an embodiment of the present invention. A schematic cross-sectional view of the double-acting multi-section cylinder with extension buffer according to the embodiment of the invention when it is extended; [Figure 5] shows the double-action multi-section cylinder with extension buffer according to the embodiment of the invention when it is extended. Schematic cross-section at the time of export.

The embodiments of the present invention will be described below based on FIGS. 1 to 5 . This description is not intended to limit the implementation of the present invention, but is one example of the present invention.

As shown in Figures 1 to 5, a double-acting multi-section cylinder 100 with extended buffering according to an embodiment of the present invention includes: an outer cylinder member 1, at least one tube shaft member 2, and a shaft. Core component 3.

As shown in Figures 1 to 5, the outer cylinder member 1 serves as an outer tube of the double-acting multi-section cylinder 100 with an extended buffer, and is located at the outermost side of the double-action multi-section cylinder 100.

As shown in Figures 1 to 5, the tubular shaft member 2 is longitudinally slidably sleeved on the outer cylinder in such a manner that the outer diameter surface of the tubular shaft member 2 corresponds to the inner diameter surface of the outer cylinder member 1. In the member 1, an outer cylinder rear side cylinder chamber 101 and an outer cylinder front side cylinder chamber 102 are separated and formed in the outer cylinder member 1. The outer cylinder rear side cylinder chamber 101 is located on the rear end surface of the tube shaft member 2. Between the outer cylinder member 1 (specifically, the rear end wall 11 of the outer cylinder member 1), the outer cylinder front side cylinder chamber 102 is located between the outer diameter surface of the tube shaft member 2 and the outer cylinder member 1. Between the inner diameter surfaces, the tube wall of the tube shaft member 2 forms a front inter-cylinder chamber flow channel 203. One end of the front side inter-cylinder chamber flow channel 203 is connected to the outer cylinder through a tube shaft outer diameter communication hole 23. The other end of the front side cylinder chamber 102 and the front side cylinder chamber flow channel 203 is connected to the inner diameter surface of the tube shaft member 2 .

As shown in Figures 1 to 5, the axis member 3 is longitudinally slidably sleeved on the tube shaft in such a manner that the outer diameter surface of the axis member 3 corresponds to the inner diameter surface of the tube shaft member 2. In the member 2, a tube shaft rear side cylinder chamber 201 and a tube shaft front side cylinder chamber 202 are separated and formed in the tube shaft member 2. The tube shaft rear side cylinder chamber 201 is located on the rear end surface of the axis member 3 It is connected to the tubular shaft member 2 (specifically, the rear end wall 21 of the tubular shaft member 2) and to the rear cylinder chamber 101 of the outer cylinder. The tubular shaft front cylinder chamber 202 is located in the axis member 3 between the outer diameter surface and the inner diameter surface of the tube shaft member 2 and are connected via the front inter-cylinder chamber flow channel 203 Passing through the front cylinder chamber 102 of the outer cylinder, the axis member 3 is provided with a first fluid inlet and outlet 31 and a second fluid inlet and outlet 32, and a non-intersecting first inlet and outlet is formed in the axis member 3. Flow channel 301 and a second inlet and outlet flow channel 302. One end of the first inlet and outlet flow channel 301 is connected to the first fluid inlet and outlet 31, and the other end of the first inlet and outlet flow channel 301 is connected to the cylinder chamber behind the tube shaft. 201. One end of the second inlet and outlet flow channel 302 is connected to the second fluid inlet and outlet 32, and the other end of the second inlet and outlet flow channel 302 is connected to the front side cylinder chamber 202 of the tube shaft through an axis outer diameter communication hole 33. , so that when the driving fluid is input from the first fluid inlet and outlet 31, the driving fluid flows into the tube shaft rear side cylinder chamber 201 and the outer cylinder rear side cylinder chamber 101 through the first inlet and outlet flow channel 301, and flows toward Pushing the tube shaft member 2 and the axis member 3 forward, at the same time, the driving fluid in the front side cylinder chamber 102 of the outer cylinder passes through the tube shaft outer diameter communication hole 23, the front side cylinder chamber flow channel 203, the tube The front-side cylinder chamber 202 of the shaft, the shaft outer diameter communication hole 33 and the second inlet and outlet flow channel 302 flow out of the second fluid inlet and outlet 32, thereby causing the double-acting multi-section cylinder 100 to extend forward longitudinally.

As shown in Figures 3 and 4, the tube shaft outer diameter communication hole 23 includes a tube shaft normal hole portion 231 and a tube shaft shielded hole portion 232. The tube shaft shielded hole portion 232 is located on the tube shaft. The relative longitudinal front of the normal through hole portion 231 and the outer cylinder member 1 are provided with a tube axis through hole shielding portion 14, and the tube axis shielded hole portion 232 slides corresponding to the tube axis through hole shielding portion 14, so as to connect the double axis with the tube axis through hole shielding portion 14. When the dynamic multi-section cylinder 100 extends forward longitudinally, the tube shaft member 2 extends longitudinally relative to the outer cylinder member 1 through a tube shaft normal speed extension stroke and a tube shaft buffer extension stroke.

As shown in Figure 3, during the normal speed extension stroke of the tube shaft, the tube shaft normal hole portion 231 and the tube shaft shielded hole portion 232 are both connected between the front side cylinder chamber 102 of the outer cylinder and the front side cylinder chamber. Between the flow channels 203, the driving fluid in the front side cylinder chamber 102 of the outer cylinder passes through the tube shaft outer diameter communication hole 23 and flows to the front side cylinder chamber inter-cylinder flow channel 203 at a tube shaft normal speed extension flow rate.

As shown in Figure 4, during the buffer extension stroke of the tube shaft, the tube shaft shielding hole portion 232 is relatively slid and is correspondingly shielded by the tube shaft through hole shielding portion 14 of the outer cylinder member 1, reducing the The overall flow channel cross-sectional area of the tube shaft outer diameter communication hole 23 allows the driving fluid in the front side cylinder chamber 102 of the outer cylinder to flow to the front side cylinder through the tube shaft outer diameter communication hole 23 with a tube shaft buffer extension flow. In the inter-chamber flow channel 203, the buffer extension flow of the tube shaft is smaller than the normal speed extension flow of the tube shaft, thereby slowing down the extension speed of the tube shaft member 2.

As shown in Figures 3 and 4, according to an embodiment of the double-acting multi-section cylinder 100 with extension buffering of the present invention, the flow channel cross-sectional area of the normal hole portion 231 of the tube shaft is smaller than the blocked tube shaft. The cross-sectional area of the flow path of the hole 232. In addition, in the double-acting multi-section cylinder 100 with extension buffering in the embodiment not shown, the tube shaft normal through hole portion 231 may include a plurality of tube shaft normal through holes, and the tube shaft shielded hole portion 232 may include A plurality of pipe shafts are covered with holes, and the number of through holes in the pipe shaft is usually less than the number of shielded holes in the pipe shaft. The extension buffering effect of the tube shaft member 2 can be adjusted by designing the ratio and size of the flow channel cross-sectional areas of the tube shaft normal hole portion 231 and the tube shaft shielded hole portion 232 .

As shown in Figure 4, according to an embodiment of the double-acting multi-section cylinder 100 with extension buffering of the present invention, the tube shaft through hole shielding portion 14 is formed at one end of the outer cylinder member 1 Cover (specifically, the front end cover 12 of the outer cylinder member 1).

As shown in Figures 4 and 5, according to an embodiment of the double-acting multi-section cylinder 100 with extension buffering of the present invention, the axis outer diameter communication hole 33 includes an axis normal through hole portion 331 and An axis shielded hole portion 332 is located in the relative longitudinal front of the axis normal through hole portion 331, and the inner diameter surface of the tube shaft member 2 is provided with an axis center through hole shielding part 24, the axis shielded hole part 332 slides corresponding to the axis through hole shielding part 24, so that when the double-acting multi-section cylinder 100 extends forward longitudinally, the axis member 3 is sequentially It extends longitudinally relative to the tube shaft member 2 with an axis constant speed extension stroke and an axis buffer extension stroke.

As shown in Figure 4, during the normal speed extension stroke of the shaft, the shaft normal hole portion 331 and the shaft shielded hole portion 332 are both connected to the cylinder chamber 202 on the front side of the tube shaft and the second inlet and outlet. Between the flow channels 302, the driving fluid in the cylinder chamber 202 on the front side of the tube shaft passes through the axis outer diameter communication hole 33 and flows to the second inlet and outlet flow channel 302 at a normal axis velocity.

As shown in Figure 5, during the axis buffer extension stroke, the axis shielded hole portion 332 is correspondingly shielded by the axis through hole shielding portion 24 of the tube shaft member 2 through relative sliding, reducing the The overall flow channel cross-sectional area of the shaft outer diameter communication hole 33 enables the driving fluid in the cylinder chamber 202 on the front side of the tube shaft to flow through the shaft outer diameter communication hole 33 to the second axis buffer extension flow. In and out of the flow channel 302, the axis buffer extension flow rate is smaller than the axis normal speed extension flow rate, thereby slowing down the extension speed of the axis member 3.

As shown in Figures 4 and 5, according to an embodiment of the double-acting multi-section cylinder 100 with extension buffering of the present invention, the cross-sectional area of the flow passage of the axis normal hole portion 331 is smaller than that of the axis bore. The cross-sectional area of the flow passage of the shielded hole portion 332. In addition, in the double-acting multi-section cylinder 100 with extension buffer in the embodiment not shown, the axis normal through hole part 331 may include a plurality of axis normal through holes, and the axis shielded hole part 332 may It includes a plurality of shaft-center shielded holes, and the number of the shaft-center normal holes is less than the number of the shaft-center shielded holes. The extension buffering effect of the axis member 3 can be adjusted by designing the ratio and size of the flow channel cross-sectional area of the axis normal hole portion 331 and the axis shielded hole portion 332 .

As shown in Figure 5, according to an embodiment of the double-acting multi-section cylinder 100 with extension buffering of the present invention, the axis through hole shielding portion 24 is formed on a tube shaft end cover of the tube shaft member 2 (To be more specific, this is the front end cap 22 of the tube shaft member 2).

As shown in Figures 2 to 5, according to an embodiment of the double-acting multi-section cylinder 100 with extended buffering of the present invention, the second inlet and outlet flow channel 302 is formed as an outer cavity and extends longitudinally in In the axis member 3, the first inlet and outlet flow channel 301 is formed as an inner cavity channel and extends longitudinally into the outer cavity channel. Surrounded by the outer lumen, a tube-in-tube structure is formed by the outer lumen and the inner lumen. Of course, the present invention is not limited to this, and the first inlet and outlet flow channels 301 and the second inlet and outlet flow channels 302 can also be configured in other structures. For example, a parallel but non-axial dual-chamber structure.

Next, with reference to Figures 3 to 5 , the operation mode of the double-acting multi-section cylinder 100 with extension buffer according to an embodiment of the present invention will be described as follows.

As shown in Figure 3 and in conjunction with Figures 4 and 5, when the driving fluid is input from the first fluid inlet and outlet 31, the driving fluid flows sequentially to the tube through the first inlet and outlet flow channel 301. The shaft rear side cylinder chamber 201 and the outer cylinder rear side cylinder chamber 101. Due to the relationship between the action area and the magnitude of the force, the driving fluid in the rear cylinder chamber 101 of the outer cylinder will push the tube shaft member 2, so that the tube shaft member 2 and the axis member 3 are relative to the outer cylinder member 1 and move forward. At the same time, the driving fluid in the front side cylinder chamber 102 of the outer cylinder is squeezed by the displacement of the tube shaft member 2, and passes through the tube shaft outer diameter communication hole 23, the front side cylinder chamber flow channel 203, the tube The front cylinder chamber 202 , the shaft outer diameter communication hole 33 and the second inlet and outlet flow channel 302 flow out toward the second fluid inlet and outlet 32 . At this time, the extension speed of the tube shaft member 2 mainly depends on the flow rate of the driving fluid flowing into the rear cylinder chamber 101 of the outer cylinder and the flow rate of the driving fluid flowing out of the front cylinder chamber 102 of the outer cylinder. The driving fluid flows into the outer cylinder. The greater the flow rate of the rear cylinder chamber 101 of the outer cylinder and the flow rate flowing out of the front cylinder chamber 102 of the outer cylinder, the faster the extension speed of the tube shaft member 2 will be, and vice versa.

As shown in Figure 4, after the tube shaft member 2 extends longitudinally and undergoes a period of displacement, the tube shaft shielded hole portion 232 of the tube shaft outer diameter communication hole 23 will slide along with the tube shaft member 2. Move to the position corresponding to the shielding part 14 of the tube shaft through hole of the outer cylinder member 1 . At this time, the overall flow channel cross-sectional area of the tube shaft outer diameter communication hole 23 is reduced from the original size including the tube shaft normal hole portion 231 and the tube shaft shielded hole portion 232 to only the tube shaft normal hole portion 232. The size of the through hole 231 causes the driving fluid to flow from the front side of the outer cylinder. The flow rate flowing out of the cylinder chamber 102 becomes smaller as the overall flow channel cross-sectional area of the tube shaft outer diameter communication hole 23 decreases. Therefore, the extension speed of the tube shaft member 2 is slowed down, thereby achieving the function of extension buffering.

On the other hand, as shown in Figure 4 and combined with Figures 3 and 5, due to the relationship between the action area and the magnitude of the force, the starting time of the longitudinal extension of the axis member 3 relative to the tube axis member 2 The point will usually be later than the start of the longitudinal extension of the tube shaft member 2 relative to the outer cylinder member 1 . Generally speaking, the starting time point when the axis member 3 extends longitudinally relative to the tube axis member 2 may be when the tube axis member 2 extends longitudinally to the end position or when the tube of the tube axis member 2 The period during which the shaft buffer reaches out. Similarly, the extension speed of the axis member 3 mainly depends on the flow rate of the driving fluid flowing into the tube shaft rear side cylinder chamber 201 and the flow rate of the driving fluid flowing out of the tube shaft front side cylinder chamber 202. The driving fluid flows into the tube shaft rear side cylinder chamber 202. The greater the flow rate of the cylinder chamber 201 on the rear side of the tube shaft and the flow rate out of the cylinder chamber 202 on the front side of the tube shaft, the faster the extending speed of the axis member 3 is, and vice versa.

As shown in Figure 5, after the axis member 3 extends longitudinally and undergoes a period of displacement, the axis shielded hole portion 332 of the axis outer diameter communication hole 33 will follow the axis member 3. Slide to a position corresponding to being shielded by the axis through hole shielding portion 24 of the tube shaft member 2 . At this time, the overall flow channel cross-sectional area of the axis outer diameter communication hole 33 is reduced from the original size including the axis normal hole portion 331 and the axis shielded hole portion 332 to only the axis center. The size of the normal hole portion 331 causes the flow rate of the driving fluid flowing out from the cylinder chamber 202 on the front side of the tube shaft to become smaller as the overall flow channel cross-sectional area of the shaft center outer diameter communication hole 33 decreases. Therefore, the extension speed of the axis member 3 is slowed down, thereby achieving the function of buffering the extension.

With the above structure, the double-acting multi-section cylinder 100 with extension buffering of the present invention can communicate with the front side of the outer cylinder by correspondingly shielding the tube shaft through hole shielding portion 14 when the tube shaft member 2 extends longitudinally. The tube shaft outer diameter communication hole 23 between the cylinder chamber 102 and the front side cylinder chamber flow channel 203 has the tube shaft shielded hole portion 232, so that the tube shaft outer diameter communication hole 23 originally includes the tube shaft. The through hole 231 and the tube shaft are The large flow passage cross-sectional area of the shielded hole portion 232 is reduced to a small flow passage cross-sectional area of the tube shaft normal hole portion 231, thereby reducing the outflow of the driving fluid from the outer cylinder front side cylinder chamber 102, thereby reducing the outflow of the driving fluid from the outer cylinder front side cylinder chamber 102. The extension speed of the tube shaft member 2 is slowed down to solve the problems of the conventional technology. Moreover, the double-acting multi-section cylinder 100 with extension buffering of the present invention can effectively provide the function of extension buffering without the need for precise external flow control of the driving fluid, thereby making it more convenient to be used in applications. in various institutions.

The above descriptions and explanations are only descriptions of the preferred embodiments of the present invention. Those with ordinary knowledge of this technology may make other modifications based on the patent scope defined below and the above explanations, but these modifications should still be made. It is for the spirit of the present invention and within the scope of rights of the present invention.

100:Double-acting multi-section cylinder

1: Outer cylinder components

101: Rear side cylinder chamber of outer cylinder

102: Front side cylinder chamber of outer cylinder

11:Rear end wall

12:Front cover

14: Tube shaft through hole shielding part

2: Tube shaft component

202: Tube shaft front side cylinder chamber

203:Flow channel between front cylinder chambers

21:Rear end wall

22:Front cover

23: Tube shaft outer diameter communication hole

231: Tube shaft normal hole part

232: The shielded hole part of the tube shaft

3: Axis component

301: The first inlet and outlet channel

302: The second inlet and outlet channel

31: First fluid inlet and outlet

32: Second fluid inlet and outlet

33: Axis outer diameter communication hole

331: Axis center hole part

332: Shaft shielded hole part

Claims (9)

A double-acting multi-section cylinder with extended buffer, including: an outer cylinder member; At least one tubular shaft member is longitudinally slidably sleeved in the outer cylinder member in such a manner that the outer diameter surface of the tubular shaft member corresponds to the inner diameter surface of the outer cylinder member, and is separated and formed in the outer cylinder member. There is an outer cylinder rear side cylinder chamber and an outer cylinder front side cylinder chamber. The outer cylinder rear side cylinder chamber is located between the rear end surface of the tube shaft member and the outer cylinder member. The outer cylinder front side cylinder chamber is located between the outer cylinder member and the outer cylinder member. Between the outer diameter surface of the tube shaft member and the inner diameter surface of the outer cylinder member, the tube wall of the tube shaft member forms a front side inter-cylinder chamber flow channel, and one end of the front side inter-cylinder chamber flow channel passes through a tube shaft outer The diameter connecting hole is connected to the front side cylinder chamber of the outer cylinder, and the other end of the front side cylinder chamber flow channel is connected to the inner diameter surface of the tube shaft member; and An axis member is longitudinally slidably sleeved in the tube axis member in such a manner that the outer diameter surface of the axis component corresponds to the inner diameter surface of the tube axis component, and is separated to form a A cylinder chamber on the rear side of the tube shaft and a cylinder chamber on the front side of the tube axis. The rear side cylinder chamber of the tube axis is located between the rear end surface of the axis member and the tube shaft member and is connected to the rear side cylinder chamber of the outer cylinder. The front side cylinder chamber of the tube shaft is located between the outer diameter surface of the axis member and the inner diameter surface of the tube shaft member, and is connected to the front side cylinder chamber of the outer cylinder through the front side cylinder chamber flow channel, wherein the shaft The core member is provided with a first fluid inlet and outlet and a second fluid inlet and outlet, and a first inlet and outlet flow channel and a second inlet and outlet flow channel that do not intersect with each other are formed in the core member, and the first inlet and outlet flow channel is One end is connected to the first fluid inlet and outlet, the other end of the first inlet and outlet flow channel is connected to the cylinder chamber behind the tube shaft, one end of the second inlet and outlet flow channel is connected to the second fluid inlet and outlet, and the second inlet and outlet flow channel is connected to the cylinder chamber behind the tube shaft. The other end of the flow channel is connected to the front side cylinder chamber of the tube shaft through an axis outer diameter communication hole, so that when a driving fluid is input from the first fluid inlet and outlet, the driving fluid flows in through the first inlet and outlet flow channel. The cylinder chamber on the rear side of the tube shaft and the cylinder chamber on the rear side of the outer cylinder push the tube shaft member and the axis member forward. At the same time, the driving fluid in the cylinder room on the front side of the outer cylinder is connected through the outer diameter of the tube shaft. hole, the flow channel between the front side cylinder chambers, the front side cylinder chamber of the tube shaft, the axis outer diameter communication hole and the second inlet and outlet flow channel and flow out from the second fluid inlet and outlet, thereby making the double-acting multi-section cylinder longitudinal Reach forward and move, in, The pipe shaft outer diameter communication hole includes a pipe shaft normal through hole part and a pipe shaft shielded hole part, the pipe shaft shielded hole part is located in the relative longitudinal front of the pipe shaft normal through hole part, and the outer cylinder member is provided with There is a tube shaft through hole shielding portion, and the tube shaft shielded hole portion slides corresponding to the tube shaft through hole shielding portion, so that when the double-acting multi-section cylinder extends forward longitudinally and operates, the tube shaft member is sequentially moved A tube shaft normal speed extension stroke and a tube shaft buffer extension stroke extend longitudinally relative to the outer cylinder member, During the normal speed extension stroke of the tube shaft, the normal hole portion of the tube shaft and the shielded hole portion of the tube shaft are connected between the front side cylinder chamber of the outer cylinder and the flow channel between the front side cylinder chambers, so that the front side of the outer cylinder The driving fluid in the cylinder chamber passes through the outer diameter communication hole of the tube shaft and flows to the flow channel between the front side cylinder chambers at a constant speed of the tube shaft. During the buffer extension stroke of the tube shaft, the shielded hole portion of the tube shaft is relatively slid and is correspondingly shielded by the tube shaft through hole shielding portion of the outer cylinder member, thereby reducing the overall flow of the tube shaft outer diameter communication hole. The cross-sectional area of the channel allows the driving fluid in the front cylinder chamber of the outer cylinder to pass through the tube shaft outer diameter communication hole and flow to the front side cylinder chamber flow channel with a tube shaft buffer extension flow, and the tube shaft buffer extension flow is smaller than the tube shaft buffer extension flow. The tube shaft extends out at a constant speed, thus slowing down the extension speed of the tube shaft member. As claimed in claim 1, the double-acting multi-section cylinder with extended buffering, wherein the cross-sectional area of the flow channel of the normal through-hole portion of the tube shaft is smaller than the cross-sectional area of the flow channel of the shielded hole portion of the tube shaft. The double-acting multi-section cylinder with extension buffer as described in claim 1 or 2, wherein the tube shaft normal hole portion includes a plurality of tube shaft normal holes, and the tube shaft shielded hole portion includes a plurality of tube shaft shielded holes. , the number of through holes in the tube shaft is usually smaller than the number of shielded holes in the tube shaft. The double-acting multi-section cylinder with extension buffer as claimed in claim 1, wherein the tube shaft through hole shielding portion is formed on an outer cylinder member end cover of the outer cylinder member. The double-acting multi-section cylinder with extension buffer as described in claim 1, wherein the axis outer diameter communication hole includes an axis normal hole portion and an axis shielded hole portion, and the axis shielded hole portion It is located in the relative longitudinal front of the normal through-hole part of the axis, and the inner diameter surface of the tube shaft member is provided with an axis through-hole shielding part, and the axis is covered by the shielding hole part corresponding to the axis through hole. part, so that when the double-acting multi-section cylinder extends forward longitudinally, the axis member is in sequence relative to the tube axis member with an axis normal speed extension stroke and an axis buffer extension stroke. Extend vertically, During the normal speed extension stroke of the shaft, the normal hole portion of the shaft and the shielded hole portion of the shaft are connected between the cylinder chamber on the front side of the tube shaft and the second inlet and outlet flow channel, so that the front side of the tube shaft The driving fluid in the cylinder chamber passes through the axis outer diameter communication hole and flows to the second inlet and outlet flow channel at an axis constant speed extension flow rate, During the axis buffer extension stroke, the axis shielded hole portion slides relatively and is correspondingly shielded by the axis through hole shielding portion of the tube shaft member, thereby reducing the overall flow of the axis outer diameter communication hole. channel cross-sectional area, so that the driving fluid in the cylinder chamber on the front side of the tube shaft flows to the second inlet and outlet flow channel with an axis buffer extension flow through the axis outer diameter communication hole, and the axis buffer extension flow is smaller than the axis buffer extension flow. The extension flow rate is at constant cardiac velocity, thereby slowing down the extension speed of the axis member. The double-acting multi-section cylinder with extended buffering as described in claim 5, wherein the cross-sectional area of the flow channel of the normal hole portion of the axis is smaller than the cross-sectional area of the flow path of the shielded hole portion of the axis. The double-acting multi-section cylinder with extension buffer as described in claim 5 or 6, wherein the shaft center normal through hole portion includes a plurality of shaft center normal through holes, and the shaft center shielded hole portion includes a plurality of shaft center receiving hole portions. Shielded holes, the number of through holes in the axis is usually smaller than the number of shielded holes in the axis. The double-acting multi-section cylinder with extension buffer as described in claim 5, wherein the axis through hole shielding portion is formed on a tube shaft end cover of the tube shaft member. The double-acting multi-section cylinder with extended buffering as described in claim 1, wherein the second inlet and outlet flow passage is formed as an outer cavity and longitudinally extended in the axis member, and the first inlet and outlet flow passage is formed as an outer cavity passage. An inner lumen extends longitudinally into the outer lumen and is surrounded by the outer lumen. The outer lumen and the inner lumen form a tube-in-tube structure.

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