Zero-degree rotary air cylinder

Abstract

The zero-degree rotation air cylinder comprises a cylinder body, a piston is arranged in an inner cavity of the cylinder body, the piston is provided with a control rod, and the circumferential freedom degree of the control rod is restrained and fixed while the control rod conducts axial movement along with the piston. The executing rod penetrates out of the front end of the cylinder cover, and the executing rod is pushed by an elastic piece to be kept in an outward extending state; the execution rods are matched with the control rods through the spiral grooves and the pins, so that the execution rods are driven to rotate through the spiral grooves in the early stage of axial movement of the control rods, the execution rods stop rotating and are converted into axial displacement after reaching the limiting positions of the spiral grooves, and meanwhile the elastic pieces are compressed to store force. The utility model has the advantages that the pressing action cannot be generated during rotation, and the pressing action is formed after rotation to reduce the axial size of the cylinder.

Description

Technical Field

[0001] This utility model relates to the field of cylinders, specifically to a zero-degree rotary cylinder. Background Technology

[0002] Rotary clamping cylinder (rotary cylinder), also known as corner cylinder, refers to a piston rod that can rotate to the left (or right) at a certain angle (usually 90 degrees) while extending and retracting. At the same time, it uses the clamping stroke to clamp the workpiece by the clamping wall. Its biggest advantage is that it has a rotating and pressing action, which effectively avoids the obstruction problem of traditional cylinders and is very suitable for narrow positions with limited space.

[0003] Because the rotation is achieved by using a threaded groove and a pin, the power comes from the downward pressing action. That is, the downward pressing action is initiated at the same time as the rotation begins, but the actual clamping is only achieved after the rotation is completely completed.

[0004] Therefore, when satisfying the rotation action, it is necessary to leave enough axial stroke for the cylinder to meet the requirements of its rotation process, and then leave enough for the downward stroke. Thus, the stroke required during the rotation process will also occupy the installation space, which will still affect the installation in some special cases. Utility Model Content

[0005] Based on the above problems, the purpose of this utility model is to provide a zero-degree rotary cylinder that does not produce a downward pressing action during rotation, but forms a downward pressing action after rotation is completed to reduce the axial dimension of the cylinder.

[0006] To address the above problems, the following technical solution is provided: a zero-degree rotary cylinder, including a cylinder body, a piston disposed in the inner cavity of the cylinder body, a control rod disposed on the piston, the control rod following the piston in axial movement while its circumferential degree of freedom is constrained and fixed; it also includes a cylinder head and an actuator rod extending from the front end of the cylinder head, the actuator rod being pushed by an elastic element to maintain its extended state; the actuator rod and the control rod are adapted to each other by a helical groove and a pin, so that in the early stage of the axial movement of the control rod, the actuator rod is driven to rotate by the helical groove, and after reaching the limit position of the helical groove, the rotation stops and is converted into axial displacement, while the elastic element is compressed to store force.

[0007] The present invention is further provided that the rear end of the cylinder head is provided with an anti-rotation support; the anti-rotation support is provided with a guide hole for the control rod to pass through, and the control rod slides axially along the guide hole while its circumferential degree of freedom is constrained by the guide hole.

[0008] The present invention is further configured such that the outer wall of the control rod is provided with an anti-rotation surface, and the wall of the guide hole is provided with a guide surface adapted to the anti-rotation surface.

[0009] The present invention is further configured such that a support cavity is provided at the rear end of the cylinder head; the rear section of the actuator rod is located in the support cavity and has a sliding hole at its end, and the front end of the control rod is inserted into the sliding hole and slides in cooperation with the sliding hole; the spiral groove is formed on the outer wall of the actuator rod and is in a through-hole configuration; the pin is fixed to the front end of the control rod and is adapted to the spiral groove; the stroke of the piston and the control rod is greater than the length of the spiral groove in the axial direction of the actuator rod, so that after reaching the end of the spiral groove, the actuator rod is pulled by the pin to perform an axial retraction action.

[0010] The present invention is further configured such that there are two spiral grooves, which are spaced 180 degrees apart in the circumferential direction of the actuator rod; the pin passes through the control rod and its two ends are respectively adapted to each spiral groove.

[0011] The present invention is further configured such that the elastic element is a spring, which is located in the support cavity and is concentrically arranged with the actuator and / or control rod. One end of the elastic element abuts against the anti-rotation support, and the other end abuts against the reset element on the outer wall of the actuator to keep the actuator in an extended state.

[0012] The present invention is further configured such that the outer wall of the actuator rod is provided with an outer groove, and the reset member is a third retaining spring that is locked in the outer groove; when the elastic member abuts against the reset member to keep the actuator rod in the extended state, the reset member abuts against the bottom end face of the support cavity.

[0013] The present invention is further configured such that the anti-rotation support is fixed to the rear end of the support cavity or directly fixedly connected to the cylinder body or integrally connected thereto; the cylinder head is fixedly connected to the cylinder body.

[0014] The present invention is further provided with a first retaining spring at the front end of the cylinder body to prevent the cylinder head from falling out, and an anti-rotation pin for limiting the rotation of the cylinder head; and a rear cover at the rear end of the cylinder body that is integrally connected to the cylinder body or fixed by a second retaining spring to prevent it from falling out.

[0015] The present invention is further configured such that the cylinder body cavity is provided with inlet and outlet at both extreme positions corresponding to the piston stroke.

[0016] The beneficial effects of this utility model are:

[0017] 1. The elastic element keeps the actuator rod in an extended state. When the piston drives the control rod to move away from the actuator rod, the axial displacement is first converted into circumferential rotation through the fit between the helical groove and the pin. Due to the support of the elastic element, the axial position of the actuator rod remains unchanged in this state, only the circumferential angle changes (i.e., only rotational motion is produced). As the piston drives the control rod to move further away from the actuator rod, the pin reaches the end of the helical groove. At this time, the control rod pulls the actuator rod axially through the pin and compresses the elastic element to store force (i.e., only axial clamping motion is produced). This structure avoids the need to provide space for the actuator rod to move axially when it is rotating, making it suitable for rotational downward clamping in more confined spaces.

[0018] 2. The specific method for constraining the circumferential degree of freedom of the control rod is to open an anti-rotation surface on the side wall of the control rod and restrict the circumferential degree of freedom through a non-rotational section;

[0019] 3. Both ends of the spiral groove are provided with a positioning section extending in the axial direction of the actuator rod; the positioning section can be fitted and locked with the pin when the actuator rod is subjected to external torsional force to prevent circumferential rotation;

[0020] 4. The elastic element is used for resetting and keeping the axial position of the actuator fixed in the early stage of the control lever's axial movement. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the drive rod of this utility model in its initial state.

[0023] Figure 3 This is a three-dimensional structural diagram of the drive rod in the rotation state of this utility model.

[0024] Figure 4 This is a three-dimensional structural diagram of the drive rod in the pressed state of this utility model.

[0025] Figure 5 This is a three-dimensional cross-sectional view of the drive rod of this utility model.

[0026] Figure 6 This is a schematic diagram of the exploded three-dimensional structure of this utility model.

[0027] The labels in the diagram have the following meanings: 10-Cylinder block; 101-Inlet / outlet; 11-Piston; 12-Control rod; 121-Anti-rotation surface; 13-Cylinder head; 131-Support cavity; 14-Actuator rod; 141-Helical groove; 1411-Positioning section; 142-Sliding hole; 143-Outer groove; 144-Fixing hole; 15-Elastic element; 16-Pin; 17-Anti-rotation support; 171-Guide hole; 172-Guide surface; 18-Reset element; 19-Buffer pad; 20-Fixing pin; 21-First snap ring; 22-Anti-rotation pin; 23-Second snap ring; 24-Rear cover; 25-First sealing ring; 26-Second sealing ring; 27-Third sealing ring. Detailed Implementation

[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0029] refer to Figures 1 to 6 ,like Figures 1 to 6 The zero-degree rotary cylinder shown includes a cylinder body 10, with a piston 11 inside the cylinder body 10. The piston 11 has a control rod 12, which moves axially with the piston 11 while its circumferential degree of freedom is constrained and fixed. It also includes a cylinder head 13 and an actuator 14 extending from the front end of the cylinder head 13. The actuator 14 is pushed by an elastic element 15 to keep it in an extended state. The actuator 14 and the control rod 12 are adapted to a pin 16 through a helical groove 141. In the early stage of the axial movement of the control rod 12, the actuator 14 is driven to rotate through the helical groove 141. After reaching the limit position of the helical groove 141, the rotation stops and the displacement is converted into axial displacement. At the same time, the elastic element 15 is compressed to store force.

[0030] In the above structure, the elastic element 15 is used to keep the actuator 14 in an extended state. When the piston 11 drives the control rod 12 to move away from the actuator 14, the axial displacement is first converted into circumferential rotation through the adaptation of the helical groove 141 and the pin 16. Due to the support of the elastic element 15, the axial position of the actuator 14 remains unchanged in this state, only the circumferential angle changes (i.e., only a rotational action is generated). As the piston 11 drives the control rod 12 to move further away from the actuator 14, the pin 16 reaches the end of the helical groove 141. At this time, the control rod 12 pulls the actuator 14 to perform axial displacement through the pin 16 and compresses the elastic element 15 to store force (i.e., only an axial clamping action is generated). This structure avoids the need to provide space for the actuator 14 to move axially in the rotating state, making it suitable for rotational downward clamping in more confined spaces.

[0031] In this embodiment, the cylinder head 13 is also provided with an anti-rotation support 17 at its rear end; the anti-rotation support 17 is provided with a guide hole 171 through which the control rod 12 passes, and the control rod 12 slides axially along the guide hole 171 while its circumferential degree of freedom is constrained by the guide hole 171.

[0032] In the above structure, the anti-rotation support 17 is directly or indirectly fixed to the cylinder 10; when the piston 11 drives the control rod 12 to move axially, a circumferential rotational torque will be generated between the control rod 12 and the actuator 14. However, the piston 11 and the control rod 12 themselves are not constrained in the circumferential direction. Therefore, the circumferential degree of freedom of the control rod 12 needs to be constrained by the anti-rotation support 17 and the guide hole 171.

[0033] In this embodiment, the outer wall of the control rod 12 is provided with an anti-rotation surface 121, and the wall of the guide hole 171 is provided with a guide surface 172 that is adapted to the anti-rotation surface 121.

[0034] In the above structure, the circumferential degree of freedom of the control rod 12 is specifically constrained by opening an anti-rotation surface 121 on the side wall of the control rod 12, and restricting the circumferential degree of freedom through a non-rotational section; the anti-rotation surface 121 and the guide surface 172 are preferably two, and are set apart from each other by 180 degrees.

[0035] In this embodiment, the cylinder head 13 has a support cavity 131 at its rear end; the rear section of the actuator 14 is located in the support cavity 131 and has a sliding hole 142 at its end; the front end of the control rod 12 is inserted into the sliding hole 142 and slides in cooperation with the sliding hole 142; the spiral groove 141 is formed on the outer wall of the actuator 14 and is in a through-hole 142; the pin 16 is fixed to the front end of the control rod 12 and is adapted to the spiral groove 141; the stroke of the piston 11 and the control rod 12 is greater than the length of the spiral groove 141 in the axial direction of the actuator 14, so that after reaching the end of the spiral groove 141, the pin 16 pulls the actuator 14 to perform an axial retraction action.

[0036] In the above structure, both ends of the spiral groove 141 are provided with a positioning section 1411 that is opened in the axial direction of the actuator 14; the positioning section 1411 can be matched and locked with the pin 16 when the actuator 14 is subjected to external torsional force to prevent circumferential rotation.

[0037] In this embodiment, there are two spiral grooves 141, which are spaced 180 degrees apart in the circumferential direction of the actuator 14; the pin 16 passes through the control rod 12 and its two ends are respectively adapted to each spiral groove 141.

[0038] The above structure ensures the stability of the force applied.

[0039] In this embodiment, the elastic element 15 is a spring, which is located in the support cavity 131 and is concentrically arranged with the actuator 14 and / or the control rod 12. One end of the elastic element 15 abuts against the anti-rotation support 17, and the other end abuts against the reset member 18 on the outer wall of the actuator 14 to keep the actuator 14 in an extended state.

[0040] In the above structure, the elastic element 15 is used for resetting and keeping the axial position of the actuator 14 fixed in the early stage of the axial movement of the control lever 12.

[0041] In this embodiment, the outer wall of the actuator 14 is provided with an outer groove 143, and the reset member 18 is a third retaining spring that is locked in the outer groove 143; when the elastic member 15 abuts against the reset member 18 to keep the actuator 14 in the extended state, the reset member 18 abuts against the bottom end face of the support cavity 131.

[0042] In the above structure, a buffer pad 19 is provided between the reset member 18 and the bottom of the support cavity 131.

[0043] In this embodiment, the anti-rotation support 17 is fixed to the rear end of the support cavity 131 or directly fixedly connected to the cylinder body 10 or integrally connected; the cylinder head 13 is fixedly connected to the cylinder body 10.

[0044] In the above structure, the anti-rotation support 17 is preferably fixed to the rear end of the support cavity 131, and the two are connected and fixed by fixing pins 20. The number of fixing pins 20 is preferably two or more, and they are spaced apart along the circumferential direction of the cylinder head 13.

[0045] In this embodiment, the front end of the cylinder body 10 is provided with a first retaining ring 21 to prevent the cylinder head 13 from coming off, and the cylinder body 10 is also provided with an anti-rotation pin 22 to limit the rotation of the cylinder head 13; the rear end of the cylinder body 10 is provided with a rear cover 24 that is integrally connected to the cylinder body 10 or fixed by a second retaining ring 23 to prevent it from coming off.

[0046] In the above structure, the reverse torque of the anti-rotation support 17 is transmitted to the cylinder head 13. To prevent the cylinder head 13 from rotating, an anti-rotation pin 22 is provided.

[0047] In this embodiment, the inner cavity of the cylinder 10 is provided with inlet and outlet 101 at the two extreme positions of the piston 11 stroke.

[0048] In the above structure, the inlet and outlet 101 control the movement direction of the piston 11 by supplying air.

[0049] In this embodiment, the exposed end of the actuator 14 is provided with a fixing hole 144 for mounting the gripper (the thread is not shown in the figure); the piston 11 and the control rod 12 are connected by a thread (the thread is not shown in the figure); the fixing pin 20 can be a pin or a grommet; the anti-rotation pin 22 can be a pin or a grommet; the outer wall of the cylinder head 13 is provided with a first sealing ring 25 for fitting and sealing with the inner wall of the cylinder body 10; the outer wall of the rear cover 24 is provided with a second sealing ring 26 for fitting and sealing with the inner wall of the cylinder body 10; the outer wall of the piston 11 is provided with a third sealing ring 27 for fitting and sealing with the inner wall of the cylinder body 10.

[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A zero-degree rotary cylinder, comprising a cylinder body, wherein a piston is disposed within the inner cavity of the cylinder body, and the piston is provided with a control rod, characterized in that: The control rod follows the piston in axial movement while its circumferential degree of freedom is constrained and fixed; it also includes a cylinder head and an actuator rod extending from the front end of the cylinder head. The actuator rod is pushed by an elastic element to keep it in an extended state; the actuator rod and the control rod are adapted to each other by a helical groove and a pin, so that the actuator rod is driven to rotate by the helical groove in the early stage of the axial movement of the control rod. After reaching the limit position of the helical groove, the rotation stops and is converted into axial displacement, while the elastic element is compressed to store force.

2. A zero-degree rotary cylinder according to claim 1, characterized in that: The cylinder head is also provided with an anti-rotation support at the rear end; the anti-rotation support is provided with a guide hole for the control rod to pass through, and the control rod slides axially along the guide hole while its circumferential degree of freedom is constrained by the guide hole.

3. A zero-degree rotary cylinder according to claim 2, characterized in that: The outer wall of the control rod is provided with an anti-rotation surface, and the wall of the guide hole is provided with a guide surface that matches the anti-rotation surface.

4. A zero-degree rotary cylinder according to claim 2 or 3, characterized in that: The cylinder head has a support cavity at its rear end; the rear section of the actuator rod is located in the support cavity and has a sliding hole at its end; the front end of the control rod is inserted into the sliding hole and slides in cooperation with it; the spiral groove is formed on the outer wall of the actuator rod and is connected to the sliding hole; the pin is fixed to the front end of the control rod and is adapted to the spiral groove; the stroke of the piston and the control rod is greater than the length of the spiral groove in the axial direction of the actuator rod, so that after reaching the end of the spiral groove, the pin pulls the actuator rod to perform an axial retraction action.

5. A zero-degree rotary cylinder according to claim 4, characterized in that: The spiral grooves are two in number and are spaced 180 degrees apart in the circumferential direction of the actuator rod; the pin passes through the control rod and its two ends are respectively adapted to each spiral groove.

6. A zero-degree rotary cylinder according to claim 4, characterized in that: The elastic element is a spring, located inside the support cavity and concentrically arranged with the actuator and / or control rod. One end of the elastic element abuts against the anti-rotation support, and the other end abuts against the reset element on the outer wall of the actuator to keep the actuator in an extended state.

7. A zero-degree rotary cylinder according to claim 6, characterized in that: The outer wall of the actuator rod is provided with an outer groove, and the reset member is a third retaining spring that is locked in the outer groove; when the elastic member abuts against the reset member so that the actuator rod is kept in the extended state, the reset member abuts against the bottom end face of the support cavity.

8. A zero-degree rotary cylinder according to claim 4, characterized in that: The anti-rotation support is fixed to the rear end of the support cavity or directly fixedly connected to the cylinder body or integrally connected; the cylinder head is fixedly connected to the cylinder body.

9. A zero-degree rotary cylinder according to claim 8, characterized in that: The cylinder body has a first retaining spring at the front end to prevent the cylinder head from coming off, and the cylinder body also has an anti-rotation pin to limit the rotation of the cylinder head; the cylinder body has a rear cover that is integrally connected to the cylinder body or fixed by a second retaining spring to prevent it from coming off.

10. A zero-degree rotary cylinder according to claim 1, characterized in that: The cylinder body cavity is equipped with inlets and outlets at both extreme positions corresponding to the piston stroke.

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