Piston rod with limiting function

Abstract

The utility model relates to a piston rod with a limiting function. The piston rod comprises a clamping part arranged on a cylinder body and a limiting part fixedly connected to the piston rod. The clamping part comprises a support hinged to the cylinder body, a roller is rotationally arranged on the side, close to the piston rod, of the support, the side, away from the cylinder body, of the support is connected with the cylinder body through an extension spring, and the extension spring and the portion, connected with the cylinder body, of the support are located on the two sides of the piston rod respectively. The side, close to the cylinder body, of the limiting part is provided with an inclined face extending towards the axis of the piston rod. The inclined face intersects with the motion trail of the roller. The roller rolling along the piston rod rolls on the inclined plane, the tension of the extension spring to the support is gradually increased, kinetic energy on the piston rod is gradually converted into elastic potential energy of the extension spring, impact abrasion to the limiting part is reduced, and the device is simple, efficient, safe and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a piston rod technical field especially a piston rod with limit function. BACKGROUND

[0002] Piston rod is the connecting component of supporting piston to do work, mostly applied in the motion execution component of oil cylinder, cylinder, is a motion component of frequent motion, high technical requirement, in order to protect the safety of equipment and operator, prevent the mechanical damage or personnel injury caused by excessive movement of piston rod, the limit function is generally set on the piston rod to prevent the piston rod from exceeding its design stroke range, thereby avoiding equipment damage or operator injury.

[0003] But the existing piston rod usually adopts fixed limit sleeve for limiting, lacks buffer device, leading to that the limit sleeve is easy to wear in the long-term working process, therefore needs a kind of piston rod with limit function that can reduce wear and tear. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of piston rod with limit function, which is simple, efficient, safe and reliable, and easy to operate, by the roller rolling along the piston rod on the inclined plane, gradually increasing the tension spring on the bracket, gradually converting the kinetic energy on the piston rod into the elastic potential energy of the tension spring, thereby reducing the impact and wear of the limiting part.

[0005] The utility model is realized by the following technical scheme, provide piston rod with limit function, including the clamping part being set on cylinder body and the limiting part being fixed on piston rod;The clamping part includes the bracket being hinged on cylinder body, the side of bracket close to piston rod is provided with roller, and the side of bracket away from cylinder body is connected with cylinder body by tension spring, and the part of tension spring and bracket connecting cylinder body is located on both sides of piston rod respectively;The side of limiting part close to cylinder body is provided with inclined plane extending towards the axis of piston rod, and the movement track of inclined plane and roller intersects;Through the roller rolling along the piston rod on the inclined plane, gradually increasing the tension spring on the bracket, gradually converting the kinetic energy on the piston rod into the elastic potential energy of the tension spring, thereby reducing the impact and wear of the limiting part.

[0006] As optimization, the bracket is relatively arranged, the piston rod is located between the two brackets, and the sides of the two brackets away from the cylinder body are connected by the tension spring;The relatively arranged brackets ensure that the piston rod is evenly stressed on both sides, preventing the piston rod from being deflected.

[0007] As optimization, the rotating shaft is provided with a through hole, the guide rod is slidably arranged in the through hole, one end of the guide rod penetrates through the tensile spring and is connected with the cylinder body, and the other end of the guide rod penetrates through the compression spring and is fixedly connected with the positioning block; kinetic energy on the piston rod is converted into elastic potential energy of the tensile spring through the compression spring, and impact and abrasion on the limiting part are reduced.

[0008] As optimization, the end of the guide rod penetrating through the compression spring is provided with a screw thread extending along the screw rod axial direction, and the positioning block is provided with a screw hole matched with the screw thread; the position of the positioning block on the guide rod is adjusted through the screw thread and the screw hole, so that the thrust applied by the compression spring to the support is controlled, the resistance of the roller to roll upward along the inclined surface is increased, and the impact and abrasion on the limiting part are reduced.

[0009] The beneficial effects of the utility model are as follows: the roller rolling along the piston rod rolls on the inclined surface, the tension of the tensile spring on the support is gradually increased, the kinetic energy on the piston rod is gradually converted into the elastic potential energy of the tensile spring, and the impact and abrasion on the limiting part are reduced; the relative arrangement of the supports ensures that the piston rod is uniformly stressed on both sides, and the piston rod is prevented from being deflected; the kinetic energy on the piston rod is converted into the elastic potential energy of the tensile spring through the compression spring, and the impact and abrasion on the limiting part are reduced; the position of the positioning block on the guide rod is adjusted through the screw thread and the screw hole, so that the thrust applied by the compression spring to the support is controlled, the resistance of the roller to roll upward along the inclined surface is increased, and the impact and abrasion on the limiting part are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structural schematic view (front view angle) of the utility model;

[0011] Figure 2 It is a structural schematic view (top view angle) of the utility model;

[0012] Figure 3 It is a sectional view of the utility model at a-a;

[0013] Figure 4 It is a sectional view of the utility model at b-b;

[0014] In the drawings:

[0015] 1, cylinder body, 2, piston rod, 3, clamping part, 4, limiting part, 301, support, 302, roller, 303, tensile spring, 304, rotating shaft, 305, guide rod, 306, compression spring, 307, positioning block. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of the scheme, the scheme will be described below through specific embodiments.

[0017] As Figure 1 , Figure 2 , Figure 3 and Figure 4 indicated in the utility model have the piston rod with the limiting function, including setting on the cylinder body 1 clamping portion 3 and fixedly connected on the piston rod 2 limiting portion 4;Clamping portion 3 includes the support 301 articulated on the cylinder body 1, the support 301 is close to the one side of piston rod 2 and is changed with the gyro wheel 302, and the side of support 301 away from the cylinder body 1 is connected with the cylinder body 1 through the extension spring 303, and the part of extension spring 303 and support 301 connecting cylinder body 1 is located on the both sides of piston rod 2 respectively;The side of limiting portion 4 close to the cylinder body 1 is provided with the inclined plane extending towards the axis of piston rod 2, and the inclined plane and the movement track of gyro wheel 302 intersect;The hinge axis of support 301 and the axis of piston rod 2 are perpendicular to each other, and the axis of gyro wheel 302 and the hinge axis of support 301 are parallel to each other.

[0018] The piston rod 2 is retracted into the cylinder body 1, and the gyro wheel 302 rolls on the piston rod 2;When gyro wheel 302 rolls to the inclined plane of limiting portion 4, gyro wheel 302 rolls along the inclined plane and gradually moves away from piston rod 2;The support 301 rotates on the cylinder body 1, and the end of support 301 away from the cylinder body 1 gradually moves away from the connecting part of extension spring 303 and cylinder body 1, and the extension spring 303 is elongated, and the extension spring 303 applies a resistance to gyro wheel 302 through support 301, which moves upward along the inclined plane, while the kinetic energy on piston rod 2 is gradually converted into the elastic potential energy of extension spring 303.

[0019] The piston rod 2 moves outwards to the cylinder body 1, the gyro wheel 302 rolls along the inclined plane and gradually approaches the piston rod 2, the support 301 rotates on the cylinder body 1, and the end of support 301 away from the cylinder body 1 gradually approaches the connecting part of extension spring 303 and cylinder body 1, and the extension spring 303 is shortened, and the extension spring 303 applies a pulling force to gyro wheel 302 through support 301, which accelerates the downward movement of gyro wheel 302 along the inclined plane, while the elastic potential energy of extension spring 303 is gradually converted into the kinetic energy on piston rod 2.

[0020] As Figure 1 , Figure 3 and Figure 4 indicated, the support 301 is oppositely arranged, the piston rod 2 is located between the two supports 301, and the sides of the two supports 301 away from the cylinder body 1 are connected by the extension spring 303.

[0021] The piston rod 2 is retracted into the cylinder body 1, and the roller 302 rolls on the piston rod 2; when the roller 302 rolls to the inclined surface of the limiting portion 4, the roller 302 rolls along the inclined surface and gradually moves away from the piston rod 2; the bracket 301 rotates on the cylinder body 1, and the one ends of the bracket 301 connected with the tensile spring 303 move away from each other, the tensile spring 303 is elongated, and the tensile spring 303 applies a resistance to the roller 302 through the bracket 301, the resistance value of which is that the roller 302 moves upward along the inclined surface, and at the same time, the kinetic energy on the piston rod 2 is gradually converted into the elastic potential energy of the tensile spring 303.

[0022] The piston rod 2 moves out of the cylinder body 1, the roller 302 rolls along the inclined surface and gradually moves close to the piston rod 2, the bracket 301 rotates on the cylinder body 1, and the one ends of the bracket 301 connected with the tensile spring 303 move close to each other, the tensile spring 303 is shortened, and the tensile spring 303 applies a pulling force to the roller 302 through the bracket 301, the pulling force value of which is that the roller 302 moves downward along the inclined surface, and at the same time, the elastic potential energy of the tensile spring 303 is gradually converted into the kinetic energy on the piston rod 2.

[0023] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the side, away from the cylinder body 1, of the bracket 301 is hinged with a rotating shaft 304, the hinge axis of which is parallel to the hinge axis of the bracket 301, a through hole is formed in the rotating shaft 304, a guide rod 305 is slidably arranged in the through hole, one end of the guide rod 305 penetrates through the tensile spring 303 and is connected with the cylinder body 1, and the other end of the guide rod 305 penetrates through a compression spring 306 and is fixedly connected with a positioning block 307; the compression spring 306 and the tensile spring 303 are respectively located on the two sides of the rotating shaft 304.

[0024] The piston rod 2 is retracted into the cylinder body 1, and the roller 302 rolls on the piston rod 2; when the roller 302 rolls to the inclined surface of the limiting portion 4, the roller 302 rolls along the inclined surface and gradually moves away from the piston rod 2; the bracket 301 rotates on the cylinder body 1, and the one ends of the bracket 301 connected with the tensile spring 303 move away from each other, the compression spring 306 is contracted, and the compression spring 306 applies a resistance to the roller 302 through the bracket 301, the resistance value of which is that the roller 302 moves upward along the inclined surface, and at the same time, the kinetic energy on the piston rod 2 is gradually converted into the elastic potential energy of the compression spring 306.

[0025] The piston rod 2 moves out of the cylinder body 1, the roller 302 rolls along the inclined surface and gradually moves close to the piston rod 2, the bracket 301 rotates on the cylinder body 1, and the one ends of the bracket 301 connected with the tensile spring 303 move close to each other, the compression spring 306 is relaxed, and the compression spring 306 applies a pulling force to the roller 302 through the bracket 301, the pulling force value of which is that the roller 302 moves downward along the inclined surface, and at the same time, the elastic potential energy of the compression spring 306 is gradually converted into the kinetic energy on the piston rod 2.

[0026] AsFigure 1 、 Figure 3 and Figure 4 The guide rod 305 shown in the drawings has a thread extending along the axial direction of the screw rod at one end of the compression spring 306, and the positioning block 307 has a screw hole matching the thread.

[0027] The positioning block 307 is rotated, the compression spring 306 is contracted or expanded, and the pushing force of the compression spring 306 on the support 301 is adjusted.

[0028] In actual production, the positioning block 307 is rotated, the compression spring 306 is contracted or expanded, and the pushing force of the compression spring 306 on the support 301 is adjusted; the piston rod 2 is retracted into the cylinder body 1, the roller 302 rolls on the piston rod 2; when the roller 302 rolls to the inclined surface of the limiting portion 4, the roller 302 rolls along the inclined surface and gradually moves away from the piston rod 2; the support 301 rotates on the cylinder body 1, and the ends of the support 301 connected to the extension spring 303 move away from each other, the compression spring 306 is contracted, the extension spring 303 is elongated, and the extension spring 303 and the compression spring 306 exert a resistance on the roller 302 through the support 301, which resists the upward movement of the roller 302 along the inclined surface, and the kinetic energy on the piston rod 2 is gradually converted into the elastic potential energy of the extension spring 303 and the compression spring 306.

[0029] The piston rod 2 moves out of the cylinder body 1, the roller 302 rolls along the inclined surface and gradually approaches the piston rod 2, the support 301 rotates on the cylinder body 1, the ends of the support 301 connected to the extension spring 303 move close to each other, the compression spring 306 is expanded, the extension spring 303 is contracted, and the extension spring 303 and the compression spring 306 exert a pulling force on the roller 302 through the support 301, which accelerates the downward movement of the roller 302 along the inclined surface, and the elastic potential energy of the extension spring 303 and the compression spring 306 is gradually converted into the kinetic energy on the piston rod 2.

[0030] Of course, the above description is not limited to the above examples, and the technical features not described in the utility model can be realized by or using existing technology, which will not be described here; the above embodiments and drawings are only used to illustrate the technical scheme of the utility model and are not a limitation on the utility model, and the preferred embodiments of the utility model have been described in detail, and those skilled in the art should understand that changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the utility model do not deviate from the purpose of the utility model, and should also belong to the protection scope of the claims of the utility model.

Claims

1. A piston rod with a limiting function, comprising a clamping part (3) disposed on a cylinder body (1) and a limiting part (4) fixedly connected to a piston rod (2); characterized in that: The clamping part (3) includes a bracket (301) hinged to the cylinder body (1). A roller (302) is provided on the side of the bracket (301) near the piston rod (2), and the side of the bracket (301) away from the cylinder body (1) is connected to the cylinder body (1) through a tension spring (303). The tension spring (303) and the part of the bracket (301) connected to the cylinder body (1) are located on both sides of the piston rod (2). The limiting part (4) is provided with an inclined surface extending toward the axis of the piston rod (2) on the side near the cylinder body (1), and the inclined surface intersects the movement trajectory of the roller (302).

2. The piston rod with limiting function according to claim 1, characterized in that: The brackets (301) are arranged opposite each other, the piston rod (2) is located between the two brackets (301), and the two brackets (301) are connected by a tension spring (303) on the side away from the cylinder (1).

3. The piston rod with limiting function according to claim 1, characterized in that: The bracket (301) is hinged to a rotating shaft (304) on the side away from the cylinder (1), the hinge axis of which is parallel to the hinge axis of the bracket (301). A through hole is provided on the rotating shaft (304), and a guide rod (305) is slidably inserted in the through hole. One end of the guide rod (305) passes through a tension spring (303) and is connected to the cylinder (1). The other end of the guide rod (305) passes through a compression spring (306) and is fixedly connected to a positioning block (307).

4. The piston rod with limiting function according to claim 3, characterized in that: The guide rod (305) has a thread extending along the screw axis at one end through the compression spring (306), and the positioning block (307) has a screw hole that matches the thread.

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