Rotary oil cylinder with self-locking function

Abstract

The rotating oil cylinder with the self-locking function comprises a cylinder body, a piston cavity is formed in the cylinder body, a piston is arranged in the piston cavity, a piston rod is arranged on one side of the piston, a locking shaft is arranged on the other side of the piston, and the piston rod extends out of the cylinder body. A steel ball retaining ring is arranged at one end of the piston cavity, a steel ball retaining hole is formed in the steel ball retaining ring, and a first steel ball is arranged in the steel ball retaining hole; a jacking ring is arranged on the outer side of the steel ball retaining ring; a jacking conical surface corresponding to the first steel ball is arranged on the jacking ring; a first oil cavity is formed between the piston and the jacking ring, a third oil cavity is formed between the end, close to the steel ball retaining ring, of the piston cavity and the jacking ring, and a second oil cavity is formed between the other end of the piston cavity and the piston. When a workpiece is pressed, the first steel ball firmly jacks the locking shaft under the action of the jacking ring, so that the piston rod can be stably maintained at the current position, the workpiece is firmly pressed, and the influence on the machining precision due to the looseness of the workpiece is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a rotary oil cylinder with a self-locking function. Background Art

[0002] Existing rotary cylinders are commonly used in clamping fixtures to clamp workpieces. A pressure plate is mounted on the piston rod of the rotary cylinder. The extension and retraction of the piston rod drives the pressure plate to tighten or loosen the workpiece. Furthermore, during this extension and retraction, the piston in the rotary cylinder can also deflect around its own central axis, driving the pressure plate to rotate within a certain angle range.

[0003] However, when the existing rotary cylinder presses the workpiece, it completely relies on the internal oil pressure to keep the pressure plate pressed against the workpiece. At this time, the piston rod is not stable. The external load borne by the rotary cylinder will fluctuate greatly due to changes in the processing state of the workpiece, which can easily cause the piston rod to move to a certain extent, resulting in a certain looseness of the workpiece, making it impossible to press the workpiece stably, which has an adverse effect on the processing of the workpiece and affects the processing accuracy of the workpiece. Summary of the Invention

[0004] The purpose of the utility model is to solve the deficiencies in the prior art and provide a rotary oil cylinder with a self-locking function.

[0005] The object of the present invention is achieved through the following technical solution: a rotary oil cylinder with a self-locking function, comprising a cylinder body, a piston chamber provided in the cylinder body, a piston provided in the piston chamber, a piston rod provided on one side of the piston, a locking shaft provided on the other side of the piston, and the piston rod extending from the cylinder body;

[0006] A steel ball retaining ring is provided at one end of the piston cavity, and a steel ball retaining hole is provided on the steel ball retaining ring, in which a first steel ball is provided; a top pressure ring is provided on the outer side of the steel ball retaining ring, and the outer side of the top pressure ring is sealed with the inner wall of the piston cavity, and the inner side of the piston cavity is sealed with the outer side of the steel ball retaining ring; a top pressure conical surface corresponding to the first steel ball is provided on the top pressure ring; the locking shaft extends into the steel ball retaining ring, and the first steel ball is located on the outer periphery of the locking shaft;

[0007] A first oil chamber is formed between the piston and the top pressure ring, a third oil chamber is formed between one end of the piston chamber close to the steel ball retaining ring and the top pressure ring, and a second oil chamber is formed between the other end of the piston chamber and the piston; a first oil channel and a second oil channel are provided in the cylinder body, the first oil channel is connected to the first oil chamber, and the second oil channel is connected to the second oil chamber and the third oil chamber at the same time.

[0008] Preferably, the locking shaft is provided with a positioning groove that cooperates with the first steel ball.

[0009] Preferably, four steel ball retaining holes are evenly arranged on the steel ball retaining ring.

[0010] Preferably, a second steel ball is provided on the inner wall of the piston cavity, and a rotation groove corresponding to the second steel ball is provided on the side of the piston rod, and the second steel ball is embedded in the rotation groove; when the piston rod moves telescopically, the steel ball moves along the rotation groove to cause the piston rod to rotate.

[0011] Preferably, a steel ball positioning groove is provided on the inner wall of the piston cavity, and the second steel ball is placed in the steel ball positioning groove.

[0012] Preferably, the rotating groove includes a first straight groove, a second straight groove and an oblique groove, and the oblique groove is located between the first straight groove and the second straight groove.

[0013] Preferably, when the steel ball moves from one end of the chute to the other end of the chute, the piston rod rotates 90 degrees.

[0014] Preferably, the diameter of the lower end of the pressing cone surface is smaller than the diameter of the upper end of the pressing cone surface.

[0015] The beneficial effect of the utility model is that when the workpiece is pressed, the first steel ball firmly presses the locking shaft under the action of the pressure ring, thereby achieving a locking effect on the piston rod, so that the piston rod can stably maintain the current position, and even if the external load borne by the rotating oil cylinder fluctuates greatly, the piston rod will not move, thereby firmly pressing the workpiece, preventing the workpiece from loosening during the processing, and thus avoiding affecting the processing accuracy due to the loosening of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 It is a cross-sectional view of the present invention.

[0018] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0019] Figure 4 Schematic diagram of the piston rod structure.

[0020] Figure 5 This is the front view of the cylinder body.

[0021] Figure 6 for Figure 5 Cross-sectional view along the BB direction.

[0022] Figure 7 for Figure 5 Cross-sectional view in the DD direction.

[0023] Figure 8 This is a schematic diagram of the utility model when the pressure plate is installed.

[0024] In the figure: 1. cylinder body, 1-1. first oil channel, 1-2. second oil channel, 2. piston rod, 3. piston, 4. top pressure ring, 4a. top pressure cone, 5. steel ball retaining ring, 5a. steel ball retaining hole, 6. first steel ball, 7. locking shaft, 7a. positioning groove, 8. second steel ball, 9. first oil chamber, 10. second oil chamber, 11. third oil chamber, 12. rotating groove, 12a. first straight groove, 12b. inclined groove, 12c. second straight groove, 15. pressure plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0026] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0027] like Figure 1-8 As shown, a rotary oil cylinder with a self-locking function includes a cylinder body 1, a piston chamber is provided in the cylinder body 1, a piston 3 is provided in the piston chamber, a piston rod 2 is provided on one side of the piston 3, a locking shaft 7 is provided on the other side of the piston 3, and the piston rod 2 extends from the cylinder body 1; a steel ball retaining ring 5 is provided at one end of the piston chamber, a steel ball retaining hole 5a is provided on the steel ball retaining ring 5, and a first steel ball 6 is provided in the steel ball retaining hole 5a; a top pressure ring 4 is provided on the outer side of the steel ball retaining ring 5, and the outer side of the top pressure ring 4 is sealed with the inner wall of the piston chamber, and the inner side of the piston chamber is sealed with the outer side of the steel ball retaining ring 5; A pressing cone surface 4a corresponding to the first steel ball 6 is provided on the pressing ring 4; the locking shaft 7 extends into the steel ball retaining ring 5, and the first steel ball 6 is located on the periphery of the locking shaft 7; a first oil chamber 9 is formed between the piston 3 and the pressing ring 4, a third oil chamber 11 is formed between one end of the piston chamber close to the steel ball retaining ring 5 and the pressing ring 4, and a second oil chamber 10 is formed between the other end of the piston chamber and the piston 3; a first oil channel 1-1 and a second oil channel 1-2 are provided in the cylinder body 1, the first oil channel 1-1 is connected to the first oil chamber 9, and the second oil channel 1-2 is connected to the second oil chamber 10 and the third oil chamber 11 at the same time.

[0028] In the present invention, the function of the first oil passage 1-1 is to introduce hydraulic oil into the first oil chamber 9, and the function of the second oil passage 1-2 is to simultaneously introduce hydraulic oil into the second oil chamber 10 and the third oil chamber 11. When hydraulic oil is introduced into the first oil chamber 9, the piston 3 moves upward under the action of the oil pressure, thereby causing the piston rod 2 to move upward (i.e., extend outward). The upward movement of the piston rod 2 drives the pressure plate 15 connected to the piston rod 2 upward, thereby loosening the workpiece. Simultaneously, the pressure ring 4 moves downward under the action of the oil pressure in the first oil chamber 9, causing the pressing conical surface 4a on the pressure ring 4 to loosen the first steel ball 6, thereby unlocking the locking shaft 7 and ensuring that the piston rod 2 can move normally. When hydraulic oil is introduced into the second oil chamber 10 and the third oil chamber 11 simultaneously through the second oil passage 1-2, the first oil chamber 9 is in a pressure relief state, and the piston 3 moves downward under the pressure of the hydraulic oil in the second oil chamber 10, thereby driving the piston rod 2 to move downward. When the piston rod 2 moves downward, it can drive the pressure plate 15 connected to the piston rod 2 to move downward, thereby pressing the workpiece; at the same time, the top pressure ring 4 will also move upward under the pressure of the hydraulic oil in the third oil chamber 11. When the pressure plate 15 on the piston rod 2 is in contact with the workpiece, the piston 3 and the piston rod 2 will stop moving. At this time, the top pressure ring 4 continues to move upward for a certain distance under the action of the oil pressure in the third oil chamber 11. When the pressing ring 4 moves upward, the first steel ball 6 moves toward the center of the locking shaft 7 under the action of the pressing cone surface 4a, so that the first steel ball 6 firmly presses the locking shaft 7, thereby achieving a locking effect on the piston rod 2, so that the piston rod 2 can be stably maintained in the current position. Even if the external load borne by the rotary cylinder fluctuates greatly, the piston rod 2 will not move, thereby firmly pressing the workpiece to prevent the workpiece from loosening during the processing, thereby preventing the processing accuracy from being affected by the loosening of the workpiece.

[0029] The locking shaft 7 is provided with a positioning groove 7a that mates with the first steel ball 6. When the first steel ball 6 is pressed against the locking shaft 7, it engages with the positioning groove 7a. The positioning groove 7a improves the locking effect of the first steel ball 6 on the locking shaft 7. The maximum depth of the positioning groove 7a is less than one-quarter the diameter of the first steel ball 6.

[0030] The pressing conical surface 4a is arranged on the inner side of the pressing ring 4, and the diameter of the lower end of the pressing conical surface 4a is smaller than the diameter of the upper end of the pressing conical surface 4a.

[0031] In this embodiment, four steel ball retaining holes 5 a are evenly arranged on the steel ball retaining ring 5 .

[0032] Furthermore, a second steel ball 8 is provided on the inner wall of the piston cavity, and a rotation groove 12 corresponding to the second steel ball 8 is provided on the side of the piston rod 2, and the second steel ball 8 is embedded in the rotation groove 12; when the piston rod 2 moves telescopically, the steel ball moves along the rotation groove 12 to cause the piston rod 2 to rotate.

[0033] A steel ball positioning groove is provided on the inner wall of the piston cavity, and the second steel ball 8 is placed in the steel ball positioning groove.

[0034] The rotating groove 12 includes a first straight groove 12a, a second straight groove 12c, and an oblique groove 12b. The oblique groove 12b is located between the first straight groove 12a and the second straight groove 12c. The first straight groove 12a and the second straight groove 12c are both arranged along the axial direction of the piston rod 2. One end of the oblique groove 12b is connected to the first straight groove 12a, and the other end of the oblique groove 12b is connected to the second straight groove 12c.

[0035] In this embodiment, when the second steel ball moves from one end of the inclined groove 12b to the other end of the inclined groove 12b, the piston rod 2 rotates 90 degrees.

[0036] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that is the same or similar to that of the present application falls within the scope of protection of the present invention.

Claims

1. A rotary cylinder with self-locking function, characterized in that: It includes a cylinder body, a piston chamber is provided in the cylinder body, a piston is provided in the piston chamber, a piston rod is provided on one side of the piston, a locking shaft is provided on the other side of the piston, and the piston rod extends out of the cylinder body; A steel ball retaining ring is provided at one end of the piston cavity, and a steel ball retaining hole is provided on the steel ball retaining ring, in which a first steel ball is provided; a top pressure ring is provided on the outer side of the steel ball retaining ring, and the outer side of the top pressure ring is sealed with the inner wall of the piston cavity, and the inner side of the piston cavity is sealed with the outer side of the steel ball retaining ring; a top pressure conical surface corresponding to the first steel ball is provided on the top pressure ring; the locking shaft extends into the steel ball retaining ring, and the first steel ball is located on the outer periphery of the locking shaft; A first oil chamber is formed between the piston and the top pressure ring, a third oil chamber is formed between one end of the piston chamber close to the steel ball retaining ring and the top pressure ring, and a second oil chamber is formed between the other end of the piston chamber and the piston; a first oil channel and a second oil channel are provided in the cylinder body, the first oil channel is connected to the first oil chamber, and the second oil channel is connected to the second oil chamber and the third oil chamber at the same time.

2. A rotary cylinder with self-locking function according to claim 1, characterized in that: The locking shaft is provided with a positioning groove which matches the first steel ball.

3. The rotary cylinder with self-locking function according to claim 1, characterized in that: Four steel ball retaining holes are evenly arranged on the steel ball retaining ring.

4. The rotary cylinder with self-locking function according to claim 1, characterized in that: A second steel ball is provided on the inner wall of the piston cavity, and a rotation groove corresponding to the second steel ball is provided on the side of the piston rod, and the second steel ball is embedded in the rotation groove; when the piston rod moves telescopically, the steel ball moves along the rotation groove to rotate the piston rod.

5. The rotary cylinder with self-locking function according to claim 4, characterized in that: A steel ball positioning groove is provided on the inner wall of the piston cavity, and the second steel ball is placed in the steel ball positioning groove.

6. The rotary cylinder with self-locking function according to claim 4, characterized in that: The rotating groove includes a first straight groove, a second straight groove and an oblique groove, and the oblique groove is located between the first straight groove and the second straight groove.

7. The rotary cylinder with self-locking function according to claim 6, characterized in that: When the steel ball moves from one end of the chute to the other end of the chute, the piston rod rotates 90 degrees.

8. The rotary cylinder with self-locking function according to claim 1, characterized in that: The diameter of the lower end of the pressing cone surface is smaller than the diameter of the upper end of the pressing cone surface.

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