CN214331045U

CN214331045U - Cylinder unit

Info

Publication number: CN214331045U
Application number: CN202022643330.6U
Authority: CN
Inventors: 曹慧; 段学成
Original assignee: Festo China Automation Manufacturing Co ltd; Festo SE and Co KG
Current assignee: Festo China Automation Manufacturing Co ltd; Festo SE and Co KG
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-10-01
Anticipated expiration: 2030-11-16

Abstract

The application provides a cylinder unit, including the master cylinder: the master cylinder is constructed into a piston cylinder unit and is provided with a cylinder cover, a cylinder barrel, a rodless side end cover, a movable piston and a piston rod capable of telescopic movement, the cylinder barrel is arranged between the cylinder barrel cover and the rodless side end cover, the piston and the piston rod are arranged in the cylinder barrel, the piston hermetically divides an inner cavity of the cylinder barrel into a left cavity on one side of the cylinder barrel cover and a right cavity departing from the cylinder barrel cover, the piston rod is fixedly clamped in the piston, so that the piston can move with the piston rod, one end of the piston rod extends to the piston or the right cavity, the other end of the piston rod extends out of one side of the master cylinder, the rodless side end cover is arranged on the other side of the piston rod, which is positioned in the master cylinder, the cylinder unit comprises a clamping stop block, the cylinder cover is arranged between the cylinder barrel and the clamping stop block, the clamping stop block is arranged on one side, which allows the piston rod to extend out, and comprises: the clamping and driving mechanism can clamp the piston rod and drive the piston rod to move, and the stopping mechanism can stop the movement of the clamping and driving mechanism.

Description

Cylinder unit

Technical Field

The utility model relates to a cylinder field particularly, relates to a cylinder unit, especially a single-action cylinder with one-way mechanism of holding tightly of optional position.

Background

The clamping device of the prior art cylinder assembly often has only a clamping function, so that the piston rod can only be fixed after clamping and cannot move continuously under the condition. Furthermore, a common clamping mechanism is bi-directional clamping, i.e. clamping in both directions of extension and retraction of the piston rod. In addition, the common cylinder assembly is usually made of metal, and the weight of the common cylinder assembly is heavier than that of a plastic part.

CN207358935U provides an assembly piston rod clamping device, which comprises a frame, a piston rod clamping block, a clamping cylinder, a coupling head fixing block and a lifting cylinder, the lifting cylinder is fixedly arranged on the frame, and the telescopic end of the lifting cylinder is arranged upward, the coupling head fixing block is fixedly arranged on the telescopic end of the lifting cylinder, and the upper end of the coupling head fixing block is provided with a coupling head fixing groove, a lower coupling head for fixing the lower end of a damper assembly, two matched piston rod clamping blocks are transversely arranged above the coupling head fixing block, one of the piston rod clamping blocks is fixed on the frame, the other piston rod clamping block is fixed on the telescopic end of the clamping cylinder which is transversely arranged, and the clamping cylinder is also fixed on the frame.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improved cylinder unit, it makes the piston rod still can have certain stroke under the state of being pressed from both sides tightly.

According to other embodiments of the present invention, the present invention also aims to realize the unidirectional clamping of the piston rod; the above object is achieved with a single cylinder; the mechanical mechanism is simple; the space is compact; the control is convenient.

Furthermore, the present invention also aims to solve or alleviate other technical problems existing in the prior art.

The utility model discloses a cylinder unit solves above-mentioned problem, particularly, according to the utility model discloses an aspect provides:

a cylinder unit, wherein the cylinder unit comprises a master cylinder, wherein:

the master cylinder is constructed as a piston-cylinder unit and has a cylinder cover, a cylinder barrel, a rodless side end cover, a movable piston and a telescopically movable piston rod, the cylinder barrel is positioned between the cylinder cover and the rodless side end cover, the piston and the piston rod are arranged in the cylinder barrel, the piston hermetically divides an inner chamber of the cylinder barrel into a left chamber on one side of the cylinder barrel cover and a right chamber facing away from the cylinder barrel cover, the piston rod is fixedly clamped in the piston, so that the piston can move together with the piston rod, and one end of the piston rod extends to the piston or to the right chamber, and the other end of the piston rod extends out of one side of the master cylinder, the rodless side end cover is arranged on the other side of the piston rod in the master cylinder,

the cylinder unit further comprises a clamping stop, the cylinder head being arranged between the cylinder barrel and the clamping stop, the clamping stop being arranged on the side of the master cylinder from which the piston rod is allowed to extend,

the clamping stop block comprises:

a clamping and driving mechanism capable of clamping the piston rod and driving the piston rod to move,

and the stopping mechanism can stop the movement of the clamping and driving mechanism.

Optionally, according to the utility model discloses an implementation mode set up the first air inlet that is used for letting in first working gas in the cylinder lid atmospheric pressure in the right side cavity is less than all the time first working gas's atmospheric pressure, first air inlet with left side cavity intercommunication makes first air inlet lets in during first working gas, the piston is right the piston rod is applyed and is retracted thrust.

Optionally, according to an embodiment of the present invention, the clamping and driving mechanism is configured to drive the piston rod to move in the extending direction of the piston rod, a second air inlet for introducing a second working gas is provided in the clamping stop block, the second air inlet is communicated with the cavity of the clamping stop block and is configured to enable the clamping and driving mechanism to move along the extending direction of the piston rod under the condition of introducing the second working gas.

Optionally, according to an embodiment of the present invention, the clamping and driving mechanism includes a clamping piston and a driving member, the clamping piston has a pushing portion for pushing the driving member during the movement of the clamping piston, so that the driving member clamps and drives the piston rod to move due to the force of the pushing portion.

Alternatively, according to an embodiment of the present invention, the push top portion has an inclined surface that expands in a direction in which the piston rod protrudes.

Optionally, according to an embodiment of the invention, the locking mechanism is configured as a locking cylinder having a locking rod that can be moved out of the locking cylinder, and the locking rod locks the movement of the clamping and driving mechanism when the locking rod is moved out of the locking cylinder.

Optionally, according to an embodiment of the present invention, the clamping and driving mechanism includes a clamping piston, a driving member and a taper sleeve, the taper sleeve is located between the clamping piston and the driving member and is attached to the clamping piston, the inner side of the taper sleeve is configured as a conical surface expanding along the direction in which the piston rod extends, so that during the movement of the clamping piston, the conical surface of the taper sleeve pushes against the driving member, so that the driving member clamps and drives the piston rod to move due to the force of the conical surface.

Optionally, according to an embodiment of the present invention, a third air inlet for introducing a third working gas is opened on the housing of the stop cylinder, the third air inlet is communicated with the inner chamber of the stop cylinder and is configured to retract the stop rod into the stop cylinder under the introduction of the third working gas,

a second spring is also configured within the detent cylinder, the second spring applying an extension force to urge the detent lever to an extended position upon release of a third working gas.

Optionally, according to an embodiment of the present invention, the clamping stop further comprises a first spring, and after releasing the second working gas, the first spring exerts a retraction force to spring the clamping and driving mechanism back to the initial position.

The cylinder unit provided has the advantages that: the piston rod can still have a certain stroke in a clamped state; the unidirectional clamping of the piston rod is realized; the above object is achieved with a single cylinder; the mechanical mechanism is simple; the space is compact; the control is convenient.

Drawings

The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,

fig. 1 to 2 show a perspective reference view and a schematic principle drawing of an embodiment of a cylinder unit according to the invention, respectively;

fig. 3 to 6 each show an operating diagram of an exemplary cylinder unit according to the invention; and

fig. 7 shows an exemplary application of a cylinder unit according to the invention.

Detailed Description

It is easily understood that, according to the technical solution of the present invention, a plurality of alternative structural modes and implementation modes can be proposed by those skilled in the art without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and descriptive purposes only and not for purposes of indication or implication as to the relative importance of the respective components.

With reference to fig. 1 to 2, a perspective reference view and a schematic view of an embodiment of a cylinder unit 1 according to the invention are shown, respectively.

The cylinder unit 1 includes a master cylinder 11, in which:

the main cylinder 11 is configured as a piston cylinder unit and has a cylinder cover a, a cylinder B, a rodless side end cover C, a movable piston 111 and a telescopically movable piston rod 12, the cylinder B is located between the cylinder cover a and the rodless side end cover C, the piston 111 and the piston rod 12 are arranged within the cylinder B, the piston 111 sealingly divides an inner chamber of the cylinder B into a left chamber 112 on one side of the cylinder cover a and a right chamber 113 facing away from the cylinder cover a, the piston rod 12 is fixedly clamped in the piston 111 such that the piston 111 can move with the piston rod 12, and one end of the piston rod 12 extends to the piston 111 or to the right chamber 113, the other end of the piston rod extends out of one side of the main cylinder 11, the rodless side end cover C is arranged on the other side of the piston rod 12 located within the main cylinder 11,

the cylinder unit 1 further comprises a clamping stop D, the cylinder head a being arranged between the cylinder barrel B and the clamping stop D, the clamping stop D being arranged on the side of the main cylinder 11 allowing the piston rod to extend,

the clamping stop block D comprises:

a clamping and driving mechanism 13 capable of clamping the piston rod 12 and driving the piston rod 12 in motion,

a stop mechanism 14 capable of stopping the movement of the clamping and entrainment mechanism 13.

According to the above-mentioned technical solution of the present application, the piston rod 12 can still perform a certain stroke when clamped for a specific purpose (a specific application case will be explained in detail at the end of this document). Furthermore, it can be seen that the stop mechanism 14 serves to indirectly stop the movement of the piston rod 12.

It should be noted that the expressions of the clamping stop D, the cylinder head a, the cylinder B and the rodless side head C are merely for distinguishing purposes and do not represent that the cylinder unit 1 must be constructed in four pieces, and the cylinder unit 1 may be entirely constructed in an integral structure, or that a plurality of the clamping stop D, the cylinder head a, the cylinder B and the rodless side head C may be constructed in an integral structure to which other components are connected. The specific configuration depends on the actual needs. Further, the rodless side end cap C is sometimes also referred to as a rear end cap, and is exemplarily arranged on the right side in the drawing.

It will be understood that the cylinder unit 1 is intended to apply a force (retraction force) to a load by means of the end of its piston rod 12 projecting beyond the cylinder unit 1, and that it can also be said that, in use of the cylinder unit 1, the clamping stop D is arranged on the side close to the load and the rodless side end cap C is arranged on the side facing away from the load.

The piston 111 drives the piston rod 12 to move by the difference of air pressure on the two sides of the piston. To this end, the piston 111 may be configured with a through hole to allow the piston rod 12 to pass through and extend to the right chamber 113. In addition, the piston 111 may be provided with a groove for accommodating the piston rod 12.

In order to achieve a unidirectional (e.g. extension direction) clamping and a corresponding clamping stroke of the piston rod 12 without clamping action, i.e. free movement, in the other direction (e.g. retraction direction), the clamping and entraining mechanism 13 is configured to entrain the piston rod 12 in a movement in the extension direction of the piston rod 12. For example, the clamping and entraining mechanism 13 comprises a clamping piston 131 and a entraining member 132, the clamping piston 131 having a pushing-out portion for pushing against the entraining member 132 during the movement of the clamping piston 131, so that the entraining member 132 clamps and entrains the piston rod 12 by the force of the pushing-out portion. Thereby, the driver 132 performs pushing (i.e., clamping and pushing) of the piston rod 12 through the pushing top portion.

In the embodiment shown in the figures in particular, the ejection portion has a bevel that expands in the direction in which the piston rod 12 protrudes. Thereby, with the movement of the clamping piston 131 in the extending direction of the piston rod 12, the driver 132 is pushed due to the arrangement of the inclined surface, and in the case where the driver 132 contacts the piston rod 12, the piston rod 12 is subjected to a resultant force perpendicular to the inclined surface, which can be decomposed into a component force along the piston rod 12 (which is used to push the piston rod 12 to move in the extending direction) and a component force perpendicular to the piston rod 12 (which is used to clamp the piston rod 12), thereby achieving the clamping and driving functions at the same time.

As can be seen, the clamping piston 131 is closer to the cylinder head a than the driver 132, while the driver 132 is closer to, e.g. abuts (but does not necessarily have to contact) the piston rod 12 than the clamping piston 131, and the pushing top faces the driver 132.

The driver 132 can be designed as a steel ball, as a result of which the piston rod 12 can be clamped and driven in a simple, economical, low-loss manner without any damage to the piston rod 12, and the spherical shape can also be matched to the ejection head in a better manner. The bevel of the ejection portion may be configured as a conical surface (that is, the clamping piston 131 and/or the ejection portion may be configured as a rotationally symmetrical body around the piston rod 12, and the catch 132 may likewise be configured), whereby the conical surface is gradually tightened in the retraction direction of the piston rod 12. The rotationally symmetrical body is designed to apply a more uniform force to the driver 132 and the piston rod 12.

The clamping and driver mechanism 13 includes a clamping piston 131, a driver 132, and a cone 133, the cone 133 is located between the clamping piston 131 and the driver 132 and abuts against the clamping piston 131, and the inner side of the cone 133 is configured as a conical surface expanding in the direction in which the piston rod 12 protrudes, so that during the movement of the clamping piston 131, the conical surface of the cone 133 pushes against the driver 132, so that the driver 132 clamps and drives the piston rod 12 to move due to the force of the conical surface.

In this case, first, the clamping piston 131 moves, so that the conical sleeve 133 moves, and the conical surface of the conical sleeve 133 gradually approaches the driver 132 due to its movement and finally contacts the driver 132, so that the driver 132 moves toward the piston rod 12 and contacts the piston rod 12. The clamping and entrainment of the piston rod 12 is thereby simultaneously achieved by the above-mentioned resultant force effect.

The clamping and driving mechanism 13 supports the piston rod 12 to make an extending motion during clamping, in order to make the piston rod 12 also make a retracting motion, a first air inlet 15 for introducing a first working gas is arranged in the cylinder cover a, the air pressure in the right chamber 113 is always smaller than the air pressure of the first working gas, the first air inlet 15 is communicated with the left chamber 112, so that when the first working gas is introduced into the first air inlet 15, the piston 111 applies a retracting thrust to the piston rod 12.

It should be noted that the "first" in the "first working gas" is only used for the purpose of language distinction, and does not mean that the composition or property of the first working gas is necessarily different from other working gases (for example, the second and third working gases which will be mentioned later). They can be entirely the same gas, but differ in physical properties (e.g., gas pressure).

In order to keep the pressure in the right chamber 113 always lower than the pressure of the first working gas, the right chamber 113 may be connected to the outside atmosphere, and the first gas inlet 15 may be filled with compressed gas when necessary. Of course, it is also possible to let the first air inlet 15 communicate with the atmosphere, while the right chamber 113 is evacuated of negative pressure when needed, so that the same technical effect can be achieved.

Therefore, when the first working gas is introduced into the first gas inlet 15, a retraction thrust is applied to the piston rod 12 due to a difference in gas pressure between both sides of the piston 111. That is, with the clamping and entrainment mechanism 13 deactivated, the piston rod 12 may be held in place or retracted as needed for certain applications. It is understood that the number, shape, arrangement position, material and other properties of the components mentioned in the present application and the matching principle between the components can be modified according to the actual situation without departing from the concept of the present invention.

The operating principle of the clamping and entraining mechanism 13 can likewise be based on the difference in air pressure. A second gas inlet 16 for the introduction of a second working gas is schematically formed in the clamping stop D, the second gas inlet 16 communicating with the cavity of the clamping stop D and being configured to move the clamping and entraining mechanism 13 in the direction of extension of the piston rod 12 in the case of the introduction of the second working gas. The working gas introduced from the second gas inlet 16 may be configured to act on the right side of the clamping piston 131. This can be achieved, for example, by means of a second working gas having a higher atmospheric pressure, so that, when the second gas inlet 16 is supplied with the second working gas, the piston rod 12 can be moved by the clamping and driving mechanism 13 into an extension movement due to the higher gas pressure. One or more clamping strokes can thereby be obtained while retaining the function of retracting the piston rod 12 as required. Furthermore, similarly to the master cylinder 11, a gas port (arranged in the figure, for example, on the side close to the load) is formed in the clamping stop D, which is designed to be able to be supplied with gas, for example, for communication with the environment and to perform a degassing function when the clamping and entrainment mechanism 13 is moved.

Similar to the retraction movement of the piston rod 12, the clamping and entrainment mechanism 13 is also capable of the retraction movement. Schematically, the cylinder unit 1 further comprises a first spring 18. After the second working gas is released, the first spring 18 exerts a retraction force to spring the clamping and entrainment mechanism 13 back to the initial position. The first spring 18 belongs to the clamping stop D.

As a result, after the clamping and entrainment mechanism 13 has completed its entrainment function, the second working gas of the second gas inlet 16 can be removed as required and returned to the initial position by the action of the first spring 18. In this case, it will be understood that the pressure of the second working gas in the second inlet 16 is greater than the difference between the resultant of the pressure of the first working gas and the pressure of the first spring 18 and the pressure of the gas flowing in the right chamber 113, so that the clamping and entrainment functions can be performed against these forces. Furthermore, the retraction of the clamping and entraining mechanism 13 has no influence on the position of the piston rod 12. For example, in the case of the embodiment shown in the figures, due to the inclined arrangement of the inclined surfaces, the inclined surfaces may come out of contact with the catch 132 when the clamping and catch mechanism 13 is retracted.

The first spring 18 is arranged exemplarily on the side of the clamping and entrainment means 13 close to the load and is arranged around the piston rod 12, i.e. is arranged facing the direction of movement of the clamping and entrainment means 13 and is compressed when the clamping and entrainment means 13 is moved. The force of the first spring 18 which is generated when compressed is thus used to provide the retraction force of the clamping and entrainment mechanism 13. The first spring 18 can be embodied as a pretensioned spring, i.e. already in a compressed pretensioned state when the clamping and entraining mechanism 13 is in the initial position, in order to better hold it in place and only move it out when required. The first spring 18 may also be arranged on the same side as the second air inlet 16, in which case the force of the first spring is used to provide the retraction force of the clamping and entrainment mechanism 13.

The locking mechanism 14 serves to lock the movement of the clamping and driving mechanism 13 (and thus indirectly of the piston rod 12). By providing the locking means 14, a predetermined fixed clamping travel of the piston rod 12 in the clamped state can thereby be achieved, but at least one, for example two, clamping travels can be provided.

For example, the stop means 14 is arranged on one side of the clamping and entrainment means 13 and closer to the protruding end of the piston rod 12 (in particular the stop rod 141) than to the clamping and entrainment means 13, so as to stop the protruding movement of the clamping and entrainment means 13 more conveniently and economically.

In particular, the locking mechanism 14 can be configured as a locking cylinder having a locking rod (also a piston rod) 141 which can be moved out of the locking cylinder, the locking rod 141 locking the movement of the clamping and entrainment mechanism 13 when it is moved out of the locking cylinder. Of course, this locking principle can also be reversed. I.e. the arresting bar is configured in an extended state in the initial state and in a retracted state in the activated state.

The operating principle of the catch cylinder can be similar to that of the main cylinder 11, i.e. the catch cylinder is configured as a piston-cylinder unit, wherein the piston divides the chambers in the catch cylinder and the pressure difference between the chambers is used to drive the piston, which in turn drives the catch rod 141.

When the stop rod is extended, the clamping and driving mechanism 13 is stopped, so that a preset certain clamping stroke can be achieved and then the stop is performed; in the case of retraction of the stop lever, the piston rod 12 can achieve a greater clamping travel because of the absence of a stop action. In the case where a plurality of stopper mechanisms 14 are configured, or the stopper mechanism 14 has a plurality of stopper rods 141, more clamping strokes can be achieved by analogy. Or the clamping stop D is provided with a mechanical stop block which is arranged at the end facing the clamping piston 131 and at a greater distance from this end than the axial distance of the stop lever 141 from this end, so that it is able to define a second clamping stroke.

It can also be seen from the figure that the holding cylinder is attached to the clamping and entrainment mechanism 13, for example closer to the end allowing the piston rod 12 to extend than the clamping piston 131, and radially further relative to the piston rod 12. It should be noted that the cylinder unit 1 shown in the figures is still a single-acting cylinder as a whole, since the locking mechanism 14 or locking cylinder is used only for locking and does not participate in the action on the load. The detent cylinder may be replaced by other means, such as a purely mechanical stop cooperating with an action switch or the like for the stop.

In the case where the stopper mechanism 14 is configured as a stopper cylinder, in order to control the movement of the stopper rod 141 as needed, a third air inlet 17 for introducing a third working gas is opened in a housing of the stopper cylinder, and the third air inlet 17 communicates with an inner chamber of the stopper cylinder and is configured to apply a retracting thrust to the stopper rod 141 in the case where the third working gas is introduced. Similarly, a second spring 142 can be configured within the detent cylinder. After releasing the third working gas, the second spring 142 applies an extending force to push the stopping rod 141 to the extended position.

The second spring 142 is disposed at an end of the stopping rod 141 facing the withdrawing direction so as to apply a force to the stopping rod 141 in the extending direction thereof. The second spring 142 can thus be configured as a pretensioned spring in the compressed state, and the gas pressure of the third operating gas is greater than the pretension of the second spring 142, so that the arresting rod 141 can be retracted into the arresting cylinder against the spring force when the third operating gas is supplied.

Furthermore, similarly to the main cylinder 11, a gas opening (in the figure, arranged on the same side as the third gas inlet 17, for example) is formed in the side wall of the stopper cylinder, which is intended to communicate with the environment and to perform a degassing function when the stopper rod 141 is moved, for example.

An example of the operation of the cylinder unit 1 is briefly described below with reference to fig. 3 to 6, which each show an operating diagram of an exemplary cylinder unit 1 according to the invention.

As can be seen from fig. 3, in the initial state, the stop lever 141 is in an extended state, which defines a first clamping stroke of the piston rod 12. At this time, the first working gas is introduced into the first gas inlet 15, so that the piston rod 12 is continuously subjected to a force acting in the retracting direction thereof to "pull" the load, and in this state, the retracting force is balanced with the load. This initial state can also be understood as a normal operating state of the cylinder unit 1. It can also be seen that in this state, the clamping piston 131 is at a distance from the stop lever 141, so that the clamping piston 131 has a movement space behind it.

When the second working gas is introduced into the second gas inlet 16, the cylinder unit 1 enters the state shown in fig. 4. At this time, since the gas pressure of the second working gas is greater than the combined force of the first spring 18 and the first working gas, the clamp piston 131 is forced and moved in the direction in which the piston rod 12 is extended, and the taper sleeve 133 is thereby moved in the same manner. Due to the conical arrangement of the cone 133, which during the movement contacts and drives the driver 132 towards the piston rod 12 and finally to the piston rod 12, the piston rod 12 is subjected to a resultant force perpendicular to the inclined surface, which can be decomposed into a force component along the piston rod 12 (which is used to push the piston rod 12 in the extension direction) and a force component perpendicular to the piston rod 12 (which is used to clamp the piston rod 12), whereby the piston rod 12 performs the extension movement. During this movement, the clamping piston 131 strikes the stop rod 141 in the extended state and stops further extension movement, and therefore the cone 133 and the driver 132 also stop movement, and the piston rod 12 thus stops moving, completing the first clamping stroke, in order to perform a certain operation on the load.

If a greater clamping stroke is required for further operation of the load, see the operating state shown in fig. 5. At this point, the second operating gas is not supplied, so that the clamping and entraining mechanism 13 returns to the starting position due to the force of the first spring 18. In addition, the third working gas is supplied to the third gas inlet 17, whereby the stopper rod 141 is retracted so that the piston rod 12 can be extended further thereafter.

Referring now to fig. 6, it can be seen that the second working gas is again supplied to the second gas inlet 16, whereby the clamping and entrainment mechanism 13 moves with the piston rod 12 in the previously described principle and, without the limitation of the stop rod 141, can move further away in order to complete further handling of the load. It should be understood that, due to the nature of the first spring 18 (the more compressed, the greater the elastic force), it is also possible to achieve a setting of the clamping travel by controlling the magnitude of the gas pressure of the second operating gas, if necessary (the gas pressure value being different from the equilibrium point between the spring force and the gas pressure of the first operating gas, i.e. representing the equilibrium position of the movement of the clamping and entrainment means 13).

Of course, it is also possible to jump directly from the state of fig. 4 to the state of fig. 6 without going through the state shown in fig. 5. That is, while maintaining the ventilation of the second intake port 16, the third working gas is introduced to retract the stopper rod 141, so that the clamping and driving mechanism 13 and the piston rod 12 can directly perform the next clamping stroke.

With reference to fig. 7, an exemplary application of a cylinder unit 1 according to the present invention is shown. The cylinder unit 1 can be used for controlling the movement of a cradle 22 and a package 23 of a vortex spinning machine. As shown in the figure, the extending end of the piston rod of the cylinder unit 1 is connected with one end of the cradle 22, and the other end of the cylinder unit 1 is hinged and fixed through the opening of the rodless side end cover C. The cradle 22 forms a lever mechanism, the middle part of the lever mechanism is hinged and fixed, one end of the lever mechanism is connected with the extending end of the piston rod of the cylinder unit 1, the other side of the lever mechanism is provided with a cone yarn 23, the cone yarn 23 is wound with yarn, the grooved drum 21 is hinged and fixed and acts together with the cone yarn 23, and the grooved drum 21 serves as a driving wheel and is used for driving the cone yarn 23 to move.

In the normal operating state of the cylinder unit 1, on the one hand, the cradle 22 is set in a counterclockwise motion as the winding on the yarn package 23 becomes thicker over time, whereby a gradually increasing pull-out force is continuously exerted on the piston rod 12 due to the lever action. On the other hand, since the first working gas is continuously introduced into the first gas inlet 15, the piston rod 12 continuously receives a retraction force, and the pull-out force and the retraction force are balanced. This pulling force and retraction force ensure a compression between the yarn package 23 and the grooved drum 21, during which the piston rod 12 is gradually moved in the extension direction. That is, the piston rod 12 may be clamped as desired at any position within the stroke.

Since the winding on the yarn package 23 becomes thicker and the speed thereof increases gradually, even to an excessive extent, it is necessary to slightly loosen the pressing force between the yarn package 23 and the grooved drum 21 for the purpose of adjusting the speed.

In this case, the cylinder unit 1 can perform the movement process as described above, so that the piston rod 1 completes the first clamping stroke, the contact between the yarn package 23 and the grooved drum 21 is not generated, and the yarn package 23 is rotated by inertia.

When maintenance work on the grooved drum 21, the yarn package 23 and/or the cradle 22 is required, it is necessary to separate the yarn package 23 and the grooved drum 21 by a greater distance in order to leave sufficient space for the staff to perform maintenance, dismantling, installation and the like operations on them. At this time, the cylinder unit 1 can perform the movement process as described above so that the piston rod 12 is extended further, separating the bobbin 23 and the grooved drum 21 by a larger distance.

In the prior art, the current application is realized by using two cylinders or a complex control system control, and the effect can be realized by only using a single cylinder.

In conclusion, the piston rod can still have a certain stroke in the clamped state; can be clamped in any stroke; the unidirectional clamping of the piston rod is realized; the above object is achieved with a single cylinder; the mechanical mechanism is simple; the space is compact; the control is convenient.

It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above, which may occur to those skilled in the art upon reading the teachings of the present invention, are intended to be within the scope of the appended claims.

Claims

1. A cylinder unit (1), characterized in that the cylinder unit (1) comprises a master cylinder (11), wherein:

the master cylinder (11) is designed as a piston-cylinder unit and has a cylinder cover (A), a cylinder (B), a rodless side end cover (C), a movable piston (111) and a telescopically movable piston rod (12), the cylinder (B) is located between the cylinder cover (A) and the rodless side end cover (C), the piston (111) and the piston rod (12) are arranged within the cylinder (B), the piston (111) divides the inner chamber of the cylinder (B) in a sealing manner into a left chamber (112) on the cylinder cover (A) side and a right chamber (113) facing away from the cylinder cover (A), the piston rod (12) is fixedly clamped in the piston (111) such that the piston (111) can move together with the piston rod (12), and one end of the piston rod (12) extends to the piston (111) or to the right chamber (113), the other end of the piston rod extends out of one side of the main cylinder (11), the side end cover (C) without the rod is arranged at the other side of the piston rod (12) positioned in the main cylinder (11),

the cylinder unit (1) further comprising a clamping stop (D), the cylinder head (A) being arranged between the cylinder barrel (B) and the clamping stop (D), the clamping stop (D) being arranged on the side of the main cylinder (11) allowing the piston rod to extend,

the clamping stop (D) comprises:

a clamping and driving mechanism (13) capable of clamping the piston rod (12) and driving the piston rod (12) to move,

a stop mechanism (14) capable of stopping the movement of the clamping and driving mechanism (13).

2. Cylinder unit (1) according to claim 1, characterized in that a first inlet port (15) for the passage of a first working gas is provided in the cylinder head (a), the gas pressure in the right chamber (113) always being lower than the gas pressure of the first working gas, the first inlet port (15) communicating with the left chamber (112) so that the piston (111) exerts a retracting thrust on the piston rod when the first inlet port (15) passes the first working gas.

3. Cylinder unit (1) according to claim 2, wherein the clamping and entrainment mechanism (13) is configured to entrain the piston rod (12) in the direction of extension of the piston rod (12), a second gas inlet opening (16) for the introduction of a second working gas being provided in the clamping stop (D), the second gas inlet opening (16) communicating with the cavity of the clamping stop (D) and being configured to move the clamping and entrainment mechanism (13) in the direction of extension of the piston rod (12) in the event of the introduction of the second working gas.

4. A cylinder unit (1) according to claim 3, characterized in that the clamping and entrainment mechanism (13) comprises a clamping piston (131) and an entrainment member (132), the clamping piston (131) having a pushing top portion for pushing against the entrainment member (132) during movement of the clamping piston (131), so that the entrainment member (132) clamps and entrains the piston rod (12) by the force of the pushing top portion.

5. Cylinder unit (1) according to claim 4, characterised in that the ejection portion has a bevel that widens in the direction in which the piston rod (12) projects.

6. A cylinder unit (1) according to any one of claims 1 to 3, characterized in that the arresting mechanism (14) is configured as an arresting cylinder having an arresting rod (141) which is movable out of the interior of the arresting cylinder, the arresting rod (141) arresting the movement of the clamping and entrainment mechanism (13) upon movement out of the interior of the arresting cylinder.

7. The cylinder unit (1) according to claim 3, characterized in that the clamping and entrainment mechanism (13) comprises a clamping piston (131), an entrainment member (132) and a conical sleeve (133), the conical sleeve (133) being located between the clamping piston (131) and the entrainment member (132) and abutting against the clamping piston (131), the inner side of the conical sleeve (133) being configured as a conical surface which expands in the direction in which the piston rod (12) projects, so that during movement of the clamping piston (131) the conical surface of the conical sleeve (133) pushes against the entrainment member (132) so that the entrainment member (132) clamps and entrains the piston rod (12) in movement due to the force of the conical surface.

8. Cylinder unit (1) according to claim 6, characterised in that a third inlet opening (17) for the passage of a third working gas opens into the housing of the catch cylinder, the third inlet opening (17) communicating with the interior chamber of the catch cylinder and being configured such that the catch rod (141) retracts into the catch cylinder in the event of the passage of the third working gas,

a second spring (142) is also configured within the detent cylinder, the second spring (142) exerting an extending force to urge the detent lever (141) to an extended position upon release of a third working gas.

9. Cylinder unit (1) according to claim 3, characterised in that the clamping stop (D) further comprises a first spring (18), the first spring (18) exerting a retraction force to spring back the clamping and entrainment mechanism (13) to an initial position after release of the second working gas.