Clamping oil cylinder for machine head of pipe bending machine

Abstract

The utility model belongs to the technical field of oil cylinder manufacturing, and particularly relates to a clamping oil cylinder for a pipe bender head, which comprises a cylinder body, a bottom end cover, a top end cover, a piston rod and a piston body, the cylinder body is of a cylindrical structure with two open ends, the bottom end cover is hermetically arranged at one end of the cylinder body, and the top end cover is hermetically arranged at the other end of the cylinder body; a piston body is slidably arranged between the two ends in the cylinder body in a sealed mode, a piston rod is arranged at the end, facing the top end cover, of the piston body, the two ends of the piston rod penetrate through the top end cover and are connected with the top end cover in a sealed mode, a first oil through hole communicated with the interior of the cylinder body is formed in the bottom end cover, and a second oil through hole communicated with the interior of the cylinder body is formed in the top end cover. According to the clamping oil cylinder for the machine head of the pipe bending machine, the mode that the flow control device is directly arranged on the bottom end cover of the oil cylinder is adopted, the clamping oil cylinder for the machine head of the pipe bending machine is designed, and the problem that due to an existing oil cylinder, a plurality of pipelines are additionally arranged on the pipe bending machine, and maintenance and debugging are inconvenient is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil cylinder manufacturing, and particularly relates to a clamping oil cylinder for a head of a pipe bending machine. BACKGROUND

[0002] During rotation of the head of the pipe bending machine driven by oil pressure, different oil pressures are required for pipes made of different materials. However, the ordinary oil cylinder cannot adjust the oil pressure, and the device for controlling the oil pressure size is usually arranged on the oil pump or connected with some valve groups. Although this method can adjust the oil pressure, too many parts will result in a large structure of the pipe bending machine and many pipelines, and thus the maintenance and debugging are inconvenient. CONTENT OF THE UTILITY MODEL

[0003] The application aims at the defects of the prior art, directly arranges a flow control device on the bottom end cover of the oil cylinder, designs the clamping oil cylinder for the head of the pipe bending machine, and thus the oil pressure of the oil cylinder can be adjusted without using valve groups or pumps, so that the head of the pipe bending machine is not provided with many oil pipes and parts, and the problem that the oil cylinder results in many pipelines of the pipe bending machine and thus the maintenance and debugging are inconvenient is solved.

[0004] To achieve the above object, the application provides the following technical scheme.

[0005] The clamping oil cylinder for the head of the pipe bending machine comprises a cylinder body, a bottom end cover, a top end cover, a piston rod and a piston body. The cylinder body is a cylindrical structure with two open ends. The bottom end cover is arranged at one end of the cylinder body in a sealed manner. The top end cover is arranged at the other end of the cylinder body in a sealed manner. The piston body is arranged in the cylinder body in a sealed sliding manner between the two ends. The piston rod is arranged at one end of the piston body facing the top end cover. The piston rod penetrates the top end cover and is connected with the top end cover in a sealed manner between the two ends. The bottom end cover is provided with a first oil hole communicating with the inside of the cylinder body. The top end cover is provided with a second oil hole communicating with the inside of the cylinder body. The bottom end cover is provided with a flow control device.

[0006] Preferably, the flow control device comprises a first oil hole, a plug and a bolt. The bottom end cover is further provided with the first oil hole. One end of the first oil hole communicates with the two ends of the first oil hole. The other end of the first oil hole communicates with the inside of the cylinder body away from the first oil hole. The bottom end cover is provided with a threaded hole. One end of the threaded hole extends to the outside of the bottom end cover. The other end of the threaded hole communicates with the first oil hole. The top end of the bolt is provided with the plug. The bolt is matched with the threaded hole. When the bolt is completely inserted into the threaded hole, the plug can completely block the first oil hole.

[0007] Preferably, the first oil hole comprises a radial hole and an axial blind hole, the axial blind hole is arranged on the bottom end cover and faces the cylinder, one end of the axial blind hole is on the bottom end cover, the other end of the axial blind hole is in communication with the inside of the cylinder, one end of the radial hole is in communication with the two ends of the axial blind hole, the other end of the radial hole extends out of the bottom end cover, the cross-sectional shape and size of the axial blind hole is smaller than the cross-sectional shape and size of the inside of the cylinder, the first oil hole comprises a radial through hole and an inclined hole, one end of the radial through hole is in communication with the axial blind hole, the other end of the radial through hole is in communication with one end of the threaded hole in the bottom end cover, one end of the inclined hole is in communication with the threaded hole from the intersection of the side wall and the bottom wall of the threaded hole, the other end of the inclined hole is in communication with the inside of the cylinder away from the axial blind hole.

[0008] Preferably, the bottom end cover is further provided with a flow amplifier away from the flow control device.

[0009] Preferably, the flow amplifier comprises a first matching hole, a second matching hole, a tapered hole, a top ball, a spring and a plug, the first matching hole is radially arranged on the bottom end cover, one end of the first matching hole is in the bottom end cover, the other end of the first matching hole extends out of the bottom end cover, one end of the small head of the tapered hole is in communication with the radial hole, one end of the large head of the tapered hole is in communication with one end of the first matching hole in the bottom end cover, one end of the second matching hole is in communication with the first matching hole from the side wall of the first matching hole, the other end of the second matching hole is in communication with the inside of the cylinder, the top ball is located at the tapered hole, the radius of the top ball is greater than the inner diameter of one end of the small head of the tapered hole, the plug is tightly arranged on the bottom end cover away from one end of the first matching hole away from the radial hole, the spring is arranged between the plug and the top ball in the first matching hole.

[0010] Preferably, the piston body is provided with a main sealing ring on the side wall parallel to the piston rod.

[0011] Preferably, the top end cover is provided with an expansion hole on the side facing the cylinder, the top end cover is provided with a rod hole, the expansion hole is coaxial with the piston rod and the rod hole, the inner diameter of the expansion hole is greater than the inner diameter of the rod hole, the inner surface of the rod hole is in close sliding connection with the two ends of the piston rod, one end of the second oil hole is in communication with the expansion hole, the other end of the second oil hole extends out of the top end cover.

[0012] Preferably, the inner circumferential surface of the rod hole is provided with a rod sealing ring and a stellite seal.

[0013] Compared with the prior art, the application has the following advantages:

[0014] 1. This application adopts the method of directly setting the flow control device on the bottom end cover of the oil cylinder, and designs a clamping oil cylinder for the head of the pipe bending machine. This eliminates the need to use additional valve groups or pumps to adjust the oil pressure of the oil cylinder, so that the entire head of the pipe bending machine will not have many oil pipes and the number of parts will be small. This solves the problem that the current oil cylinder causes many pipelines on the pipe bending machine, making maintenance and debugging inconvenient.

[0015] 2. In this application, after oil enters the bottom end cap from the first oil passage, the opening and closing size between the plug and the first oil passage can be adjusted by bolts to regulate the flow rate. For example, if the plug covers more of the first oil passage, the oil pressure is lower. If the plug covers less of the first oil passage, the oil pressure is higher.

[0016] 3. In this application, when it is necessary to increase the oil pressure to improve the piston rod extension speed, the portion of the plug covering the oblique hole is reduced. At this time, the oil that has not yet entered the cylinder through the axial blind hole can pass through the radial through hole and then through the oblique hole into the cylinder, mixing with the oil that has entered the cylinder through the axial blind hole to drive the piston. Of course, if the speed is to be reduced, the plug can be moved to cover the oblique hole using bolts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this application;

[0018] Figure 2 for Figure 1 A structural diagram of the back side;

[0019] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0020] Figure 4 for Figure 2 Cross-sectional view of the middle section (BB).

[0021] The components are as follows: 1. Cylinder block; 2. Bottom end cap; 3. Top end cap; 4. Piston rod; 5. Piston body; 6-1. Radial hole; 6-2. Axial blind hole; 7. Second oil passage hole; 8-1. Radial through hole; 8-2. Inclined hole; 9. Plug; 10. Bolt; 11. First mating hole; 12. Second mating hole; 13. Conical end hole; 14. Top ball; 15. Spring; 16. Plug; 17. Main sealing ring; 18. Expansion hole; 19. Rod hole; 20. Rod sealing ring; 21. Step seal. Detailed Implementation

[0022] like Figures 1-4As shown, a clamping cylinder for a pipe bending machine head comprises a cylinder body 1, a bottom end cover 2, a top end cover 3, a piston rod 4, and a piston body 5. The cylinder body 1 is a cylindrical structure with both ends open. The bottom end cover 2 is tightly arranged at one end of the cylinder body 1. The top end cover 3 is tightly arranged at the other end of the cylinder body 1. The piston body 5 is tightly arranged between the two ends of the cylinder body 1. The piston rod 4 is arranged at one end of the piston body 5 facing the top end cover 3. The piston rod 4 penetrates the top end cover 3 and is tightly connected with the top end cover 3. The bottom end cover 2 is provided with a first oil hole communicating with the inside of the cylinder body 1. The top end cover 3 is provided with a second oil hole 7 communicating with the inside of the cylinder body 1. The bottom end cover 2 is provided with a flow control device.

[0023] In this embodiment, the flow control device is arranged to control the flow of oil entering the first oil hole, thereby ensuring the speed of the piston rod 4. The second oil hole 7 is used to cooperate with the first oil hole in the double-acting mode. After such arrangement, the flow can be directly adjusted by the flow control device when adjustment is needed, and no additional flow valve is needed.

[0024] As a preferred mode, the flow control device comprises a first oil hole, a plug 9, and a bolt 10. The bottom end cover 2 is further provided with a first oil hole. One end of the first oil hole communicates with the two ends of the first oil hole. The other end of the first oil hole communicates with the inside of the cylinder body 1 away from the first oil hole. The bottom end cover 2 is provided with a threaded hole. One end of the threaded hole extends to the outside of the bottom end cover 2. The other end of the threaded hole communicates with the first oil hole. The top end of the bolt 10 is provided with the plug 9. The bolt 10 cooperates with the threaded hole. When the bolt 10 is completely inserted into the threaded hole, the plug 9 can completely block the first oil hole. After such arrangement, when oil enters the bottom end cover 2 from the first oil hole, the size of the opening and closing between the plug 9 and the first oil hole can be adjusted by the bolt 10, thereby realizing the adjustment of the flow. For example, if the plug 9 covers more of the first oil hole, the oil pressure is small. If the plug 9 covers less of the first oil hole, the oil pressure is large.

[0025] As a preferred mode, the first oil hole comprises a radial hole 6-1 and an axial blind hole 6-2 provided on the bottom end cover 2, the axial blind hole 6-2 is provided on the side of the bottom end cover 2 facing the cylinder body 1, one end of the axial blind hole 6-2 is on the bottom end cover 2 and the other end is in communication with the inside of the cylinder body 1, one end of the radial hole 6-1 is in communication with the two ends of the axial blind hole 6-2 and the other end extends out of the bottom end cover 2, the cross-sectional shape and size of the axial blind hole 6-2 is smaller than the cross-sectional shape and size of the inside of the cylinder body 1, the first oil hole comprises a radial through hole 8-1 and an inclined hole 8-2, one end of the radial through hole 8-1 is in communication with the axial blind hole 6-2 and the other end is in communication with one end of the threaded hole located in the bottom end cover 2, one end of the inclined hole 8-2 is in communication with the threaded hole from the intersection of the side wall and the bottom wall of the threaded hole, and the other end of the inclined hole 8-2 is in communication with the inside of the cylinder body 1 away from the axial blind hole 6-2. After being arranged in this way, the external oil enters the axial blind hole 6-2 from the radial hole 6-1 and then enters the cylinder body 1, thereby extruding the piston body 5 and moving the piston rod 4 out of the cylinder body 1 to achieve the elongation of the piston rod 4. When it is necessary to increase the oil pressure to increase the speed of elongation of the piston rod 4, the plug 9 covers part of the inclined hole 8-2, at this time the oil that has not yet entered the cylinder body 1 from the axial blind hole 6-2 can enter the cylinder body 1 through the radial through hole 8-1 and then through the inclined hole 8-2, and mix with the oil entering the cylinder body 1 through the axial blind hole 6-2 to push the piston body 5 to move. Of course, if the speed is to be reduced, the plug 9 can be moved to cover the inclined hole 8-2 by the bolt 10.

[0026] As a preferred mode, the bottom end cover 2 is further provided with a flow amplifier away from the flow control device. By providing a flow amplifier, the flow into the cylinder body 1 on the bottom end cover 2 can be amplified, thereby increasing the speed of elongation of the piston rod 4.

[0027] As a preferred mode, the flow amplifier comprises a first matching hole 11, a second matching hole 12, a taper hole 13, a top ball 14, a spring 15, and a plug 16. The first matching hole 11 is radially arranged on the bottom end cover 2, one end of the first matching hole 11 is in the bottom end cover 2, and the other end extends out of the bottom end cover 2. The small end of the taper hole 13 communicates with the radial hole 6-1, and the large end of the taper hole 13 communicates with the end of the first matching hole 11 in the bottom end cover 1. One end of the second matching hole 12 communicates with the first matching hole 11 from the side wall of the first matching hole 11, and the other end communicates with the inside of the cylinder body 1. The top ball 14 is located at the taper hole 13, and the radius of the top ball 14 is greater than the inner diameter of the small end of the taper hole 13. The plug 16 is arranged at the end of the first matching hole 11 away from the radial hole 6-1 on the bottom end cover 2. The spring 15 is arranged between the plug 16 and the top ball 14 in the first matching hole 11. After such arrangement, the oil pressure entering the axial blind hole 6-2 from the radial hole 6-1 will press the top ball 14 at the taper hole 13, so that the top ball 14 moves away from the taper hole 13, and the oil can enter the cylinder body 1 through the second matching hole 12 after passing through the first matching hole 11 from the taper hole 13, and together with the oil entering the cylinder body 1 through the radial blind hole 6-1, push the piston body 5 to move.

[0028] As a preferred mode, the piston body 5 is provided with a main sealing ring 17 on the side wall parallel to the piston rod 4. By arranging the main sealing ring 17, the air tightness of the inside of the cylinder body 1 is ensured.

[0029] As a preferred mode, the top end cover 3 is provided with an expansion hole 18 on the side facing the cylinder body 1, and a rod hole 19 is arranged through the top end cover 3. The expansion hole 18 is coaxial with the piston rod 4 and the rod hole 19, the inner diameter of the expansion hole 18 is greater than the inner diameter of the rod hole 19, the inner surface of the rod hole 19 is in airtight sliding connection with both ends of the piston rod 4, one end of the second oil hole 7 communicates with the expansion hole 18, and the other end extends out of the top end cover 3. By arranging the expansion hole 18, the second oil hole 7 can communicate with the inside of the cylinder body 1, without occupying the volume of the cylinder body 1, and without affecting the air tightness between the piston rod 4 and the cylinder body 1.

[0030] As a preferred mode, the inner circumferential surface of the rod hole 19 is provided with a rod sealing ring 20 and a stellite seal 21. By arranging the rod sealing ring 20 and the stellite seal 21, the air tightness between the rod hole 19 and the piston rod 4 is ensured, and at the same time, since the rod sealing ring 20 and the stellite seal 21 are arranged on the inner circumferential surface of the rod hole 19, the movement of the piston rod 4 is not affected.

Claims

1. A clamping cylinder for a bending machine head, comprising a cylinder body (1), a bottom end cover (2), a top end cover (3), a piston rod (4), a piston body (5), characterized in that, The cylinder body (1) is a cylindrical structure with both ends open, the bottom end cover (2) is closed at one end of the cylinder body (1), the top end cover (3) is closed at the other end of the cylinder body (1), the piston body (5) is closed and slidably arranged between the two ends in the cylinder body (1), the piston rod (4) is arranged at one end of the piston body (5) facing the top end cover (3), the piston rod (4) penetrates the top end cover (3) and is closed connected with the top end cover (3) between the two ends, the bottom end cover (2) is provided with a first oil hole communicating with the inside of the cylinder body (1), the top end cover (3) is provided with a second oil hole (7) communicating with the inside of the cylinder body (1), the bottom end cover (2) is provided with a flow control device.

2. A clamp cylinder for a bending machine head according to claim 1, characterized in that The flow control device includes a first oil hole, a plug (9) and a bolt (10), the bottom end cover (2) is also provided with a first oil hole, one end of the first oil hole communicates with the two ends of the first oil hole, the other end of the first oil hole communicates with the inside of the cylinder body (1) away from the first oil hole, the bottom end cover (2) is provided with a threaded hole, one end of the threaded hole extends out of the bottom end cover (2), the other end of the threaded hole communicates with the first oil hole, the top end of the bolt (10) is provided with a plug (9), the bolt (10) cooperates with the threaded hole; when the bolt (10) is completely inserted into the threaded hole, the plug (9) can completely block the first oil hole.

3. A clamp cylinder for a bending machine head according to claim 2, characterized in that The first oil hole includes a radial hole (6-1) and an axial blind hole (6-2) provided on the bottom end cover (2), the axial blind hole (6-2) is provided on the side of the bottom end cover (2) facing the cylinder body (1), one end of the axial blind hole (6-2) is on the bottom end cover (2), the other end communicates with the inside of the cylinder body (1), one end of the radial hole (6-1) communicates with the two ends of the axial blind hole (6-2), the other end extends out of the bottom end cover (2), the cross-sectional shape and size of the axial blind hole (6-2) is smaller than the cross-sectional shape and size of the inside of the cylinder body (1), the first oil hole includes a radial through hole (8-1) and an inclined hole (8-2), one end of the radial through hole (8-1) communicates with the axial blind hole (6-2), the other end communicates with one end of the threaded hole in the bottom end cover (2), one end of the inclined hole (8-2) communicates with the threaded hole from the intersection of the side wall and the bottom wall of the threaded hole, the other end of the inclined hole (8-2) communicates with the inside of the cylinder body (1) away from the axial blind hole (6-2).

4. A clamp cylinder for a bending machine head according to claim 3, characterized in that The bottom end cover (2) is also provided with a flow amplifier away from the flow control device.

5. A clamp cylinder for a bending machine head according to claim 4, characterized in that The flow amplifier comprises a first fitting hole (11), a second fitting hole (12), a taper hole (13), a top ball (14), a spring (15) and a plug (16), the first fitting hole (11) is radially arranged on the bottom end cover (2), one end of the first fitting hole (11) is in the bottom end cover (2), and the other end extends out of the bottom end cover (2), the small end of the taper hole (13) is communicated with the radial hole (6-1), the big end of the taper hole (13) is communicated with the end of the first fitting hole (11) in the bottom end cover (2), one end of the second fitting hole (12) is communicated with the first fitting hole (11) from the side wall of the first fitting hole (11), and the other end is communicated with the inside of the cylinder body (1), the top ball (14) is located at the taper hole (13), the radius of the top ball (14) is greater than the inner diameter of the small end of the taper hole (13), the plug (16) is arranged on the bottom end cover (2) at the end of the first fitting hole (11) away from the radial hole (6-1), and the spring (15) is arranged in the first fitting hole (11) between the plug (16) and the top ball (14).

6. A clamp cylinder for a bending machine head according to claim 5, characterized in that The piston body (5) is provided with a main sealing ring (17) on the side wall parallel to the piston rod (4).

7. A clamp cylinder for a bending machine head according to claim 1, characterized in that The top end cover (3) is provided with an expansion hole (18) on the side facing the cylinder body (1), the top end cover (3) is provided with a rod hole (19), the expansion hole (18) is coaxial with the piston rod (4) and the rod hole (19), the inner diameter of the expansion hole (18) is greater than the inner diameter of the rod hole (19), the inner surface of the rod hole (19) is in close sliding connection between the two ends of the piston rod (4), one end of the second oil hole (7) is communicated with the expansion hole (18), and the other end extends out of the top end cover (3).

8. A clamp cylinder for a bending machine head according to claim 7, characterized in that The inner circumferential surface of the rod hole (19) is provided with a rod sealing ring (20) and a stellite seal (21).

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