CN217029483U - Executive component - Google Patents

Abstract

The utility model belongs to the technical field of mechanical equipment, and discloses an executing element which comprises a cylinder body, a piston rod and a sensing device, wherein the piston rod is telescopically arranged in the cylinder body, the sensing device is used for detecting whether the piston rod is stretched in place or not, a fixed groove for installing the sensing device is concavely arranged on the surface of the cylinder body, a positioning hole is formed in the bottom wall of the fixed groove, the sensing device comprises a shell and a limiting piece arranged on the shell, when the sensing device is installed, the shell of the sensing device is inserted into the fixed groove until the limiting piece on the shell is opposite to the positioning hole in the bottom wall of the fixed groove, one end of the limiting piece extends into the positioning hole to complete the fixation of the sensing device, no additional fixing device is needed to be arranged, the efficiency is high, the cost is low, the contact area between the sensing device and the cylinder body can be increased through the matching of the fixed groove and the outer surface of the shell, and the stability after the sensing device and the cylinder body are connected is improved, the induction device is more stable and firm after being installed, and the accuracy of detecting the position of the piston rod is ensured.

Description

Executing element

Technical Field

The utility model relates to the technical field of mechanical equipment, in particular to an execution element.

Background

The magnetic switch is a signal sensor for detecting the action of the air cylinder, a piston rod of the air cylinder is provided with a magnetic ring, the magnetic ring moves along with the piston rod when the piston rod moves, the magnetic switch senses the magnetic ring on the piston rod to detect whether the piston rod moves in place, and meanwhile, the magnetic switch transmits a signal to a control system to perform the next action, so that the damage to parts and workpieces caused by the fact that the piston rod does not move in place is prevented.

The piston rod of the air cylinder can vibrate in the long-time high-frequency stretching process, so that the magnetic switch is loosened and finally deviates from the correct position, the detection of signals is influenced, and abnormal conditions are caused.

In the prior art, there are generally two fixing manners of the magnetic switch and the cylinder: one is to add an additional fixing device on the cylinder for fixing the magnetic switch; the other is to add an additional fixing device on the magnetic switch to fix the magnetic switch on the cylinder body of the air cylinder. In both of the above-mentioned two ways of fixing the magnetic switch, the piston rod of the cylinder needs to be repeatedly operated to determine the optimum position for signal detection, and then the fixing device is locked.

The prior art has the following defects: although the not hard up problem of magnetic switch can be solved to above-mentioned two kinds of fixed schemes, nevertheless all need to set up extra fixing device, increased part quantity and overall cost, be unfavorable for the equipment miniaturization, moreover, all need adjust repeatedly with the best detection position of confirming magnetic switch when installation magnetic switch, complex operation has reduced the installation effectiveness.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an actuating element, which can fix a magnetic switch on a cylinder body of the actuating element without arranging an additional fixing device, avoids increasing the number of parts and cost, is beneficial to realizing the miniaturization of equipment and can improve the installation efficiency of the magnetic switch.

In order to achieve the purpose, the utility model adopts the following technical scheme:

providing an executing element, which comprises a cylinder body, a piston rod and a sensing device, wherein the piston rod is telescopically arranged in the cylinder body, the sensing device is used for detecting whether the piston rod moves in place, a fixing groove is concavely arranged on the surface of the cylinder body, and a positioning hole is formed in the bottom wall of the fixing groove; the induction device comprises a shell and a limiting piece arranged on the shell;

the shell can be inserted into the fixing groove, and the limiting piece can extend into the positioning hole, so that the induction device is fixed on the cylinder body.

As a preferable embodiment of the actuator provided by the present invention, a magnetic member is disposed on the piston rod, an induction area for inducing the magnetic member is disposed on the housing, the magnetic member has at least one preset position, the positioning hole is disposed corresponding to the preset position, and a distance between the positioning hole and the corresponding preset position is equal to a distance between the limiting member and the induction area.

As a preferable aspect of the actuator provided by the present invention, the plurality of fixing grooves are provided at intervals on an outer circumferential surface of the cylinder, and the magnetic member is a magnetic ring.

As a preferable aspect of the actuator provided by the present invention, a bottom wall of the fixing groove is provided with a plurality of the positioning holes, and the fixing groove extends along a length direction of the piston rod.

As a preferable aspect of the actuator according to the present invention, the fixing groove penetrates the cylinder.

As a preferable aspect of the actuator provided by the present invention, the cross section of the fixing groove is preferably arc-shaped.

As a preferable aspect of the actuator provided by the present invention, the fixing groove includes a first groove section and a second groove section that are communicated with each other, the positioning hole is disposed on a bottom wall of the first groove section, a cross section of the first groove section is preferably arc-shaped, and a cross section of the second groove section is rectangular.

As a preferable embodiment of the actuator provided by the present invention, the position-limiting element is inserted into the housing, and the depth of the positioning hole is 1/10-1/8 of the length of the position-limiting element.

As a preferable aspect of the actuator provided by the present invention, the stopper includes a jackscrew or a screw.

As a preferable aspect of the actuator provided by the present invention, a relationship between the diameter R1 of the positioning hole and the diameter R2 of the limiting member is: R1-R2 is 0.2 mm-0.5 mm.

The utility model has the beneficial effects that:

the utility model provides an executing element which comprises a cylinder body, a piston rod and a sensing device, wherein the piston rod is telescopically arranged in the cylinder body, the cylinder body can be fixedly arranged on mechanical equipment, the piston rod stretches relative to the cylinder body so as to transmit power to other parts, and the sensing device is used for detecting whether the piston rod stretches in place or not in the stretching process of the piston rod, so that the situation that parts and workpieces are damaged due to the fact that the piston rod does not move in place can be avoided. The concave fixed slot that is used for installing induction system that is equipped with in surface of cylinder body, the diapire of fixed slot is provided with the locating hole, induction system includes the casing and sets up the locating part on the casing, during installation induction system, insert induction system's casing and locate in the fixed slot, locating part on the casing is just right with the locating hole on the fixed slot diapire, stretch into the locating hole with the one end of locating part and can accomplish induction system's fixed, need not to set up extra fixing device and can be fixed in induction system on executive component's the cylinder body, avoid increasing part quantity and cost, do benefit to and realize equipment miniaturization, and can improve induction system's installation effectiveness. The fixed groove is matched with the outer surface of the shell, so that the contact area between the sensing device and the cylinder body can be increased, the stability after the sensing device and the cylinder body are connected is improved, the sensing device is more stable and firm after being installed, the phenomenon that the connection between the sensing device and the cylinder body is loosened due to long-time vibration of an executing element is avoided, and the accuracy in detecting the position of the piston rod is ensured.

Drawings

FIG. 1 is a schematic structural diagram of a cylinder block provided in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an actuator provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of the cylinder and the sensing device installed according to the embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a cross-sectional view of a cylinder block provided by an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a retaining slot provided in accordance with an embodiment of the present invention;

fig. 7 is a sectional view of a fixing groove according to another embodiment of the present invention;

FIG. 8 is a schematic view of a position limiting member according to an embodiment of the present invention;

FIG. 9 is an isometric view of a sensing device provided in accordance with an embodiment of the present invention;

fig. 10 is a bottom view of fig. 9.

In the figure:

1. a cylinder body; 2. a piston rod; 3. an induction device;

11. a fixing groove; 12. positioning holes;

111. a first groove section; 112. a second groove section;

21. a magnetic member;

31. a housing; 32. a stopper; 33. a sensing region;

311. and (7) mounting holes.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not to be construed as limiting the utility model. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

As shown in fig. 1 to 3, the present embodiment provides an actuator including a cylinder 1, a piston rod 2, and a sensing device 3.

The piston rod 2 is telescopically arranged in the cylinder body 1, the cylinder body 1 can be fixedly arranged on mechanical equipment, and the piston rod 2 stretches relative to the cylinder body 1 to transmit power to other parts. In the process of extending and retracting the piston rod 2, the sensing device 3 is used for detecting whether the piston rod 2 extends and retracts in place or not, so that the situation that parts and workpieces are damaged due to the fact that the piston rod 2 does not move in place can be avoided.

In the present embodiment, referring to fig. 1 and 3, a fixing groove 11 for mounting the sensing device 3 is concavely provided on the surface of the cylinder 1, and a positioning hole 12 is provided on the bottom wall of the fixing groove 11. The sensing device 3 includes a housing 31 and a limiting member 32 disposed on the housing 31. When installing induction system 3, insert casing 31 of induction system 3 and locate in fixed slot 11, locating part 32 on casing 31 is just right with locating hole 12 on the 11 diapalls of fixed slot, stretch into locating hole 12 with the one end of locating part 32 and can accomplish induction system 3 fixed, need not to set up extra fixing device and can be fixed in induction system 3 on actuating element's cylinder body 1, avoid increasing part quantity and cost, do benefit to and realize equipment miniaturization, and can improve induction system 3's installation effectiveness.

The cooperation of fixed slot 11 and casing 31 surface can increase the area of contact between induction system 3 and the cylinder body 1, improves the stability after induction system 3 and the cylinder body 1 are connected for induction system 3 is more firm after the installation, avoids leading to being connected between induction system 3 and the cylinder body 1 not hard up because of the long-time vibration of actuating element, and the accuracy when guaranteeing to detect piston rod 2 position.

The fixed mode of induction system 3 that this embodiment provided on the basis that does not increase unnecessary part, can realize the fixed connection between induction system 3 and the cylinder body 1 fast and high-efficiently, simultaneously, can also guarantee the steadiness after connecting, effectively avoid connecting not hard up.

Referring to fig. 2 and 3, the piston rod 2 is provided with a magnetic member 21. When the piston rod 2 moves in a telescopic manner along the length direction thereof, the magnetic member 21 on the piston rod moves along with the piston rod. The sensing device 3 further comprises a sensing area 33, and the sensing area 33 is disposed on the housing 31 and is used for sensing the magnetic member 21 to detect whether the piston rod 2 is moved to the right position. When the magnetic member 21 is driven by the piston rod 2 to move to the position aligned with the sensing area 33 of the sensing device 3, the sensing area 33 can sense the magnetic member 21 and generate a signal, the signal can be transmitted to a main control system of the mechanical equipment to indicate that the piston rod 2 is moved in place, and then the main control system sends out an instruction to perform the next process.

In this embodiment, the magnetic member 21 is a magnetic ring. The magnetic ring is sleeved on the piston rod 2 to move along with the piston rod 2. The magnetic ring is convenient to process and can be conveniently connected with the piston rod 2. For example, the magnet ring and the piston rod 2 may be connected by a retaining screw. Further, since the magnetic ring is annular, the magnetic ring passing through the sensing area 33 of the sensing device 3 located in the fixed groove 11 can be detected regardless of where the fixed groove 11 is opened on the outer peripheral surface of the cylinder 1.

Alternatively, in the present embodiment, referring to fig. 2 and 3, the magnetic member 21 has two preset positions. Accordingly, two induction devices 3 are mounted on the cylinder 1. Two preset positions are set as a first preset position and a second preset position respectively, the magnetic member 21 in fig. 2 and 3 is located at the first preset position, and the dotted line position on the left side is the second preset position of the magnetic member 21.

With continued reference to fig. 2 and 3, the extending direction of the fixing groove 11 is the same as the length direction of the piston rod 2, and one positioning hole 12 is correspondingly disposed on the bottom wall of the fixing groove 11 at both the first preset position and the second preset position (i.e. two positioning holes 12 are disposed in one fixing groove 11). Referring to fig. 3, the right positioning hole 12 corresponds to a first preset position of the magnetic member 21, and is used for limiting the right sensing device 3, so that the sensing area 33 of the right sensing device 3 is opposite to the first preset position. The left positioning hole 12 corresponds to a second predetermined position (dashed line on the left side of fig. 3) of the magnetic member 21, and is used for limiting the left sensing device 3, so that the sensing area 33 of the left sensing device 3 is opposite to the second predetermined position.

When the piston rod 2 drives the magnetic member 21 to move to the first preset position, the sensing area 33 of the right sensing device 3 can sense the magnetic member 21, and when the piston rod 2 drives the magnetic member 21 to move to the second preset position, the sensing area 33 of the left sensing device 3 can sense the magnetic member 21, so that the master control system can obtain a signal that the piston rod 2 reaches the preset position, and further smoothly perform the next step.

The distance between the positioning hole 12 and the corresponding predetermined position is equal to the distance between the limiting member 32 and the sensing region 33. Specifically, referring to fig. 3 and fig. 4, taking the first preset position as an example, a distance between the first preset position and the corresponding positioning hole 12 is L1, a distance between the limiting member 32 on the housing 31 of the sensing device 3 and the sensing area 33 is L2, and L1 is L2. In this way, the housing 31 of the sensing device 3 is inserted into the fixing groove 11 and moved, and when the limiting member 32 is moved to be aligned with the positioning hole 12, the sensing area 33 is also exactly aligned with the first preset position, and at this time, the end of the limiting member 32 is inserted into the positioning hole 12, and it is not necessary to repeatedly adjust the actuator to determine the optimal installation position of the sensing device 3, thereby effectively improving the installation efficiency.

Obviously, two fixing slots 11 may be provided on the outer surface of the cylinder 1, and one positioning hole 12 is provided on the bottom wall of each fixing slot 11 to correspond to the first preset position and the second preset position, and it is required to ensure that the sensing devices 3 installed at the two positioning holes 12 can sense the magnetic member 21. At this time, the extending direction of the fixing groove 11 is not limited to the length direction of the piston rod 2, that is, the fixing groove 11 may extend in any direction, and the extending directions of the two fixing grooves 11 may be the same or different, as long as it is ensured that the two sensing devices 3 after being installed can detect the magnetic member 21 at the corresponding position.

It should be understood that, in other embodiments, the magnetic element 21 may have one or more than three predetermined positions, and it is only necessary to ensure that there is a corresponding positioning hole 12 at each predetermined position, and ensure that the distance between the positioning hole 12 and the corresponding predetermined position is equal to the distance between the limiting element 32 and the sensing area 33.

Preferably, the sensing device 3 in this embodiment is a magnetic switch, which is convenient for material selection.

A plurality of fixing grooves 11 may be formed at intervals on the outer circumferential surface of the cylinder 1 regardless of the number of predetermined positions of the magnetic member 21 (i.e., regardless of the number of positioning holes 12 to be formed). When the actuator is actually mounted on the mechanical device, if only one fixing groove 11 is provided, the fixing groove 11 may be blocked by other components, and the sensing device 3 may interfere with other components. By providing a plurality of fixing grooves 11 on the outer peripheral surface of the cylinder 1, the sensing device 3 can have a sufficient number of mounting positions to be mounted at appropriate positions without interference, and thus, the practicability is enhanced. Since the magnetic member 21 in this embodiment is a magnetic ring, the sensing device 3 installed in any one of the fixing slots 11 can sense the magnetic member 21 passing through it.

Further, each fixing groove 11 extends along the length direction of the piston rod 2, that is, the outer circumferential surface of the cylinder 1 is provided with a plurality of fixing grooves 11 in parallel and at intervals. As shown in fig. 5, the cylinder body 1 has a rectangular cross section, the upper and lower surfaces (referring to the orientation in fig. 5) of the cylinder body are used for mounting and fixing with mechanical equipment, and the left and right surfaces are provided with two fixing grooves 11. In actual installation, the sensing device 3 can be installed in the fixing groove 11 at a proper position, so that the installation flexibility of the sensing device 3 is improved.

Of course, the number and distribution of the fixing grooves 11 on the cylinder 1 are not limited to the arrangement of the embodiment, and the number and distribution of the fixing grooves 11 are not particularly limited. For example, in the case of a cylindrical cylinder 1, a plurality of fixing grooves 11 may be opened uniformly in the circumferential direction of the cylinder 1.

Further, when the magnetic member 21 has a plurality of predetermined positions, the plurality of positioning holes 12 corresponding to the plurality of predetermined positions may be distributed in the same fixing groove 11, or may be distributed in different fixing grooves 11. In actual installation, it is only necessary to determine which fixing groove or fixing grooves 11 the sensing device 3 is installed in, confirm the position of the positioning hole 12 according to the principle of L2 from the L1, and then machine the positioning hole 12 in the corresponding fixing groove 11.

In an alternative embodiment, see fig. 6, the cross-section of the fixation groove 11 is preferably arc-shaped. After the housing 31 of the induction device 3 is inserted into the arc-shaped groove, the wall of the arc-shaped groove can limit the induction device 3 to move left and right and up and down. After the limiting member 32 is inserted into the positioning hole 12, the sensing device 3 is limited from moving along the extending direction of the fixing groove 11 (i.e. the direction perpendicular to the paper surface in fig. 6), so that the sensing device 3 is fixed in the fixing groove 11.

When the cross-section of the fixing groove 11 is preferably arc-shaped, referring to fig. 6, the groove wall of the fixing groove 11 is connected with the outer surface of the cylinder 1 to form a tip, the tip is in contact with the shell 31 of the sensing device 3, and the contact is a line-surface contact, and the vibration generated when the actuator operates may cause the tip to scratch the shell 31.

In a new embodiment, referring to fig. 5, the fixing groove 11 includes a first groove section 111 and a second groove section 112 which are communicated with each other. The cross section of the first groove section 111 is preferably arc-shaped, the positioning hole 12 is disposed on the bottom wall of the first groove section 111, and the first groove section 111 is used for limiting the left-right movement and the up-down movement of the induction device 3 (refer to the orientation in fig. 5). The second slot segment 112 has a rectangular cross section, and the shape and size of the housing 31 are adapted to the shape and size of the first slot segment 111 and the second slot segment 112. After the shell 31 is inserted into the fixing groove 11, the shell 31 is in surface contact with both the groove wall of the first groove section 111 and the groove wall of the second groove section 112, so that the stress area of the shell 31 is increased, and the shell 31 is prevented from being scratched by the cylinder 1 due to vibration.

Of course, the cross section of the first groove section 111 may be rectangular or any other shape that can limit the movement of the housing 31 in the direction away from the cylinder 1. Referring to fig. 7, when the first groove section 111 has a rectangular cross section, the cross section of the entire fixing groove 11 has a transverse T shape, and the housing 31 inserted therein can be restricted from moving in the left-right and up-down directions.

In the present embodiment, referring to fig. 1, the fixing groove 11 penetrates the side surface of the cylinder 1 in the longitudinal direction of the piston rod 2. When the sensing device 3 is installed, the housing 31 of the sensing device 3 can be inserted into the fixing slot 11 through the openings at the two ends of the fixing slot 11, then the sensing device 3 is moved until the position-limiting member 32 is aligned with the positioning hole 12, and then the position-limiting member 32 can be inserted into the positioning hole 12. In addition, the sensing device 3 in fig. 3 has a long bar shape, and when the sensing device 3 is fixed, one end of the sensing device is suspended relative to the cylinder 1, namely, extends out through the opening at the end of the fixing groove 11. Therefore, the fixing groove 11 is formed to penetrate the cylinder 1, and can be adapted to the bar-shaped sensing device 3.

Optionally, in this embodiment, referring to fig. 9, a mounting hole 311 is formed in the housing 31 of the sensing device 3, and the limiting member 32 is inserted into the mounting hole 311 and can extend into the positioning hole 12 on the bottom wall of the fixing groove 11.

Further, referring to fig. 5 and 8, the depth L3 of positioning hole 12 is 1/10-1/8 of the length L4 of limiting member 32, so that the strength of cylinder 1 is not weakened too much while the end of limiting member 32 is ensured to be able to cooperate with positioning hole 12 for limiting. In addition, the depth of the positioning hole 12 is set to 1/10-1/8 of the length of the limiting piece 32, so that the installation requirement can be met without taking a long limiting piece 32.

Optionally, the limiting member 32 is a jackscrew or a screw, which is convenient to obtain and easy to obtain. An internal thread is arranged in the mounting hole 311 of the housing 31, and a jackscrew or a screw is screwed in the mounting hole 311 to ensure that the limiting member 32 and the housing 31 have high connection strength and cannot be loosened too quickly due to vibration of an actuating element. Even if loosening occurs, the jackscrew or the screw can be screwed down during maintenance.

In this embodiment, the diameter of the positioning hole 12 is set to be R1, the diameter of the position-limiting element 32 is set to be R2, and the relationship between the two is: R1-R2 is 0.2 mm-0.5 mm. . That is, the diameter of the positioning hole 12 is slightly larger than the diameter of the limiting member 32, so as to ensure that the end of the limiting member 32 can smoothly enter the positioning hole 12, and at the same time, the small gap between the limiting member 32 and the wall of the positioning hole 12 does not affect the limiting of the sensing device 3. Illustratively, the difference between the diameter R1 of the positioning hole 12 and the diameter R2 of the stopper 32 is 0.3 mm.

It should be understood that the shape of the sensing device 3 in the present embodiment is not limited, as long as the housing 31 is processed. The sensor device 3 shown in fig. 2 and 3 is elongated, which makes it possible to make the overall actuator more compact. As shown in fig. 9 and 10, another shape of the sensing device 3 is shown, which also has the advantages of convenient and fast installation and good stability after installation.

The actuating element provided by the embodiment can be a cylinder or an oil cylinder, the surface of the cylinder body 1 of the two can be provided with a fixing groove 11, and the bottom wall of the fixing groove 11 is provided with a positioning hole 12, so as to install the sensing device 3 for detecting whether the piston rods 2 of the two move in place.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations, and substitutions will occur to those skilled in the art without departing from the scope of the present invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An actuating element, includes cylinder body (1), piston rod (2) and induction system (3), piston rod (2) telescopically set up in cylinder body (1), induction system (3) are used for detecting whether piston rod (2) moves target in place, its characterized in that:

a fixing groove (11) is concavely arranged on the surface of the cylinder body (1), and a positioning hole (12) is formed in the bottom wall of the fixing groove (11);

the induction device (3) comprises a shell (31) and a limiting piece (32) arranged on the shell (31);

the shell (31) can be inserted into the fixing groove (11), and the limiting piece (32) can extend into the positioning hole (12) so that the sensing device (3) is fixed on the cylinder body (1).

2. Actuator according to claim 1, wherein a magnetic member (21) is arranged on the piston rod (2), a sensing area (33) for sensing the magnetic member (21) is arranged on the housing (31), the magnetic member (21) has at least one predetermined position, the positioning hole (12) is arranged corresponding to the predetermined position, and the distance between the positioning hole (12) and the corresponding predetermined position is equal to the distance between the limiting member (32) and the sensing area (33).

3. Actuator according to claim 2, wherein the cylinder (1) has a plurality of fixing slots (11) spaced apart from each other on its outer circumference, and the magnetic member (21) is a magnetic ring.

4. Actuator according to any of claims 1-3, wherein the bottom wall of the fixation groove (11) is provided with a plurality of said positioning holes (12), the fixation groove (11) extending in the length direction of the piston rod (2).

5. Actuator according to any of claims 1 to 3, wherein the fixation groove (11) extends through the cylinder (1).

6. Actuator according to any of claims 1 to 3, wherein the cross-section of the fixation groove (11) is preferably curved.

7. Actuator according to any of claims 1 to 3, wherein the fixing groove (11) comprises a first groove section (111) and a second groove section (112) which are communicated with each other, the positioning hole (12) is arranged on the bottom wall of the first groove section (111), the cross section of the first groove section (111) is preferably arc-shaped, and the cross section of the second groove section (112) is rectangular.

8. Actuator according to any of claims 1 to 3, wherein the stop (32) is attached to the housing (31) by threading, and the depth of the positioning hole (12) is 1/10-1/8 of the length of the stop (32).

9. Actuator according to any of claims 1 to 3, wherein the stop (32) comprises a jackscrew or a screw.

10. Actuator according to any of claims 1 to 3, wherein the relationship between the diameter R1 of the positioning hole (12) and the diameter R2 of the stop (32) is: R1-R2 is 0.2 mm-0.5 mm.

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