Steel pipe cold-rolling mill and chuck swing elastic force driving device thereof

Abstract

The utility model provides a chuck swing elastic force driving device which comprises an oil cylinder, an elastic piece, a limiting frame, a telescopic rod, a return stroke mechanism and a swing frame. Wherein the oil cylinder comprises a piston rod, and the piston rod and the telescopic rod are fixed in the extending direction; the limiting frame is arranged on the telescopic rod in a sleeving mode and can slide on the telescopic rod. The elastic piece sleeves the telescopic rod and is positioned between one end, connected with the piston rod, of the telescopic rod and the limiting frame; the return stroke mechanism is fixed on the telescopic rod and is far away from one end of the piston rod; one end of the swing frame is movably connected with the limiting frame, and the other end is rotatable; a fixing mechanism and a swing frame shifting pin are installed on the two sides of the limiting frame. The swing frame is connected with a chuck. The utility model further provides a two-roller steel pipe cold-rolling mill which comprises the chuck swing elastic force driving device.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe cold rolling mills, in particular to a steel pipe cold rolling mill and a chuck swing elastic force driving device thereof. Background Art

[0002] As Figure 1-2 shown, in the prior art two-roll steel pipe cold rolling mill chuck swing driving device, the oil cylinder 1 is directly installed on the vertical plate 3 of the rolling mill frame. When the piston rod of the oil cylinder 1 extends, the I-shaped joint 15 and the connecting pin 16 on the oil cylinder push the swing frame 10 to rotate around the center of the fixed pin 12. The swing frame 10 swings from the chuck release position 7 to the chuck clamping position 11. The swing frame 10 is a common part in the prior art. It realizes the release and clamping of the steel pipe by the chuck through the swing slide hole 10.1 on the swing frame 10. The clamping force of the prior art chuck is determined by the thrust of the oil cylinder 1, and the size of the thrust is adjusted by the pressure regulating valve in the hydraulic system. Generally, the oil pressure of the oil cylinder 1 cannot be too high. If the oil pressure is too high and the thrust is too large, the clamping force of the cold rolling mill chuck on the steel pipe will also be too large, and the steel pipe cannot be fed normally during the rolling process. If the oil pressure is too small and the thrust is too small, it cannot overcome the resistance to make the swing frame swing in place, and the cold rolling mill chuck cannot clamp the steel pipe, and the steel pipe cannot be rolled normally. In addition, the oil pressure fluctuation of the hydraulic system will also cause the change of the oil pressure of the oil cylinder 1, resulting in the change of the clamping force of the chuck and affecting the normal progress of steel pipe rolling. Content of the Utility Model

[0003] Based on this, the chuck swing elastic force driving device of the utility model converts the thrust generated by the oil pressure into the elastic force of the elastic member to drive the swing frame to swing, so that the thrust received by the swing frame is stable and not affected by the oil pressure, and further the clamping force of the chuck is kept constant, ensuring the normal progress of steel pipe rolling.

[0004] The first part:

[0005] A chuck swing elastic force driving device includes an oil cylinder, an elastic member, a limit frame, a telescopic rod, a return mechanism and a swing frame;

[0006] Wherein, the oil cylinder includes a piston rod, and the piston rod is fixedly connected with the telescopic rod in the extending direction; the limit frame is a hollow structure and penetrates along a first direction and a second direction. The limit frame is sleeved on the telescopic rod along the first direction and can slide on the telescopic rod; the elastic member is sleeved on the telescopic rod and is located between one end of the telescopic rod connected with the piston rod and the limit frame. When the piston rod extends, the elastic member can be compressed to push the limit frame to slide along the first direction; the return mechanism is fixed on the telescopic rod and is located at one end far from the piston rod;

[0007] One end of the swing frame passes through the limit frame along the second direction and is movably connected to the limit frame. The swing frame can rotate around the other end of the swing frame as the limit frame slides in the first direction. The swing frame is connected to a chuck.

[0008] The utility model installs a telescopic rod on the piston rod of the oil cylinder, and installs an elastic member, a limit frame and a return mechanism on the telescopic rod. Through the combined action of various components, the swing frame can be pushed with a stable and controllable thrust, and the sliding range of the limit frame can be controlled, thereby ensuring the swing range of the swing frame, and finally achieving constant control of the clamping force of the chuck on the steel pipe, avoiding the influence of the clamping force of the chuck due to the change of the oil pressure of the oil cylinder, and ensuring that the steel pipe can be rolled normally for a long time.

[0009] As a preferred solution, the swing frame includes a driving arm at one end, the limiting frame is equipped with a fixing mechanism and a swing frame driving pin, the swing frame driving pin is connected to the driving arm and fixed to the limiting frame through the fixing mechanism.

[0010] As a preferred solution, the swing arm is provided with a waist-shaped hole, and the swing frame toggle pin passes through the waist-shaped hole and the limit frame in sequence and is fixed to the fixing mechanism. The waist-shaped hole can limit the range of motion of the swing frame toggle pin, thereby further limiting the swing amplitude of the swing frame.

[0011] As a preferred solution, there are two groups of the lever arms, and a groove is formed in the middle of the two groups of lever arms, and the telescopic rod passes through the groove; each group of the lever arms is correspondingly provided with a group of the fixing mechanism and the swing frame toggle pin, and the two groups of the swing frame toggle pins are symmetrically installed on both sides of the telescopic rod. The groove formed in the middle of the two groups of lever arms can guide the telescopic rod, and the swing frame toggle pins are symmetrically installed on both sides of the telescopic rod to balance the force on the swing frame.

[0012] As a preferred solution, the telescopic rod extends radially along one end connected to the piston rod to form a step structure, and the elastic member is located between the step structure and the limit frame. The step structure makes it easier to compress the elastic member when the piston rod is extended, thereby pushing the limit frame.

[0013] As a preferred solution, the elastic member is a spring. The spring has a simple structure and can better control the magnitude of the elastic force, thereby pushing the swing frame with a more stable and controllable thrust.

[0014] As a preferred solution, a receiving groove is provided on one side of the step structure of the telescopic rod facing the limiting frame, and one end of the spring is fixed in the receiving groove. The spring can be positioned by the receiving groove on the telescopic rod.

[0015] As a preferred solution, the telescopic rod is provided with threads, the return mechanism is a nut, and the nut is in threaded fit with the telescopic rod. By adjusting the fixed position of the nut through the threads, the position of the limit frame is further restricted to adapt to the different swing amplitude requirements of the swing frame.

[0016] As a preferred solution, a support frame is provided on one side of the piston rod of the oil cylinder. A cavity is formed inside the support frame and a through hole is provided along the first direction. When the piston rod extends, it is located inside the cavity. The support frame plays a role in guiding and protecting the piston rod.

[0017] Second part:

[0018] A steel pipe cold rolling mill includes the chuck swing elastic driving device described in the first part. Description of the drawings

[0019] Figure 1 is a schematic structural diagram of a chuck swing driving device of a prior art two-high steel pipe cold rolling mill;

[0020] Figure 2 is Figure 1 the sectional view taken along A-A in

[0021] Figure 3 is a schematic diagram of the clamping state of a chuck swing elastic driving device of a two-high steel pipe cold rolling mill according to the present invention;

[0022] Figure 4 is Figure 3 the sectional view taken along B-B in

[0023] Figure 5 is a schematic diagram of the relaxation state of a chuck swing elastic driving device of a two-high steel pipe cold rolling mill according to the present invention;

[0024] Figure 6 is a schematic diagram of the limit frame part of a chuck swing elastic driving device of a two-high steel pipe cold rolling mill according to the present invention;

[0025] Figure 7 is a schematic diagram of the swing frame part of a chuck swing elastic driving device of a two-high steel pipe cold rolling mill according to the present invention;

[0026] Wherein: 1 - oil cylinder, 2 - support frame, 3 - vertical plate of the rolling mill frame, 4 - spring, 5 - limit frame, 6 - telescopic rod, 7 - chuck relaxation position, 8 - sliding sleeve, 9 - nut, 10 - swing frame, 10.1 - swing sliding hole, 10.2 - kidney-shaped hole, 10.3 - dialing arm, 11 - chuck clamping position, 12 - fixing pin, 13 - swing frame dialing pin, 14 - fixing mechanism, 15 - I-shaped joint, 16 - connecting pin. Detailed implementation manners

[0027] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0032] Example 1

[0033] like Figures 3-7 As shown, a chuck swing elastic drive device includes an oil cylinder 1, a support frame 2, a rolling mill frame vertical plate 3, a spring 4, a limit frame 5, a telescopic rod 6, a sliding sleeve 8, a nut 9, a swing frame 10, a fixing pin 12, a swing frame toggle pin 13, and a fixing mechanism 14.

[0034] like Figure 3As shown, the oil cylinder 1 includes a piston rod. On one side of the piston rod of the oil cylinder 1, a support frame 2 is installed. A cavity is formed inside the support frame 2 and a through hole is provided along the extending direction of the piston rod. When the piston rod extends, it is located inside the cavity. The cavity formed by the support frame 2 plays a role in guiding and protecting. One end of the support frame 2 away from the oil cylinder 1 is installed with the vertical plate 3 of the rolling mill frame.

[0035] As Figure 3 shown, the piston rod and the telescopic rod 6 are fixedly connected in the extending direction; the limiting frame 5 is a hollow structure and is penetrated along the first direction and the second direction. The first direction is perpendicular to the second direction. In this embodiment, the first direction is the horizontal direction and the second direction is the vertical direction. The limiting frame 5 is sleeved on the telescopic rod 6 along the first direction and can slide on the telescopic rod 6; one end of the telescopic rod 6 forms a stepped structure in the radial extension. A receiving groove is provided on one side of the stepped structure facing the limiting frame 5. The other end of the telescopic rod 6 is provided with a thread, and the nut 9 is fixed on the telescopic rod 6 through the thread; the spring 4 is sleeved on the telescopic rod 6 and is fixed in the receiving groove of the telescopic rod 6 and abuts against the limiting frame 5. When the piston rod extends, the spring 6 can be compressed and the limiting frame 5 can be pushed to slide along the first direction; the sliding sleeve 8 is sleeved on the telescopic rod 6 and can slide on the telescopic rod 6, and is located between the limiting frame 5 and the nut 9, playing a role in protecting the limiting frame 6.

[0036] As Figure 6 shown, Figure 6 A is the top view of the limiting frame 5, Figure 6 B is the a-a cross-sectional view, Figure 6 C is the b-b cross-sectional view.

[0037] As Figure 4 、 7 shown, one end of the swing frame 10 penetrates the limiting frame 5 along the second direction, and the other end is provided with a fixing pin 12. One end of the swing frame 10 is movably connected to the limiting frame 5, and the other end can rotate around the fixing pin 12 as the limiting frame 5 slides in the first direction; the swing frame 10 includes two groups of dial arms 10.3 at one end. A groove is formed between the two groups of dial arms 10.3, and the telescopic rod 6 passes through the groove; each group of dial arms 10.3 is correspondingly provided with a group of fixing mechanisms 14 and swing frame dialing pins 13. The two groups of swing frame dialing pins 13 are symmetrically installed on both sides of the telescopic rod 6; the dial arm 10.3 is provided with a kidney-shaped hole 10.2. Each group of swing frame dialing pins 13 sequentially passes through the kidney-shaped hole 10.2 and the limiting frame 5 and is fixed to the fixing mechanism 14; the swing frame 10 is further provided with a swing sliding hole 10.1, and the swing sliding hole 10.1 is connected with a chuck (not shown in the figure).

[0038] As Figure 3As shown in the figure, when the piston rod of the oil cylinder 1 extends, the telescopic rod 6 connected to the end of the piston rod of the oil cylinder 1 also extends forward. The spring 4 is compressed when it is stressed, and the spring force acts on the limit frame 5. The swing frame toggle pins 13 installed on both sides of the limit frame 5 push the swing frame 10 to rotate around the center of the fixed pin 12. The swing frame 10 swings from the chuck release position 7 to the chuck clamping position 11. At this time, the piston rod of the oil cylinder 1 has fully extended, and the nut 9 fixed on the telescopic rod 6 is not in contact with the end face of the sliding sleeve 8.

[0039] At this time, the clamping force of the chuck is determined by the spring force. As long as the elastic coefficient and length of the spring 4 are selected properly, the clamping force of the chuck can be kept constant, and the oil pressure of the oil cylinder 1 does not need to be adjusted by a pressure regulating valve. The oil pressure of the hydraulic system is directly used for oil supply, which not only simplifies the oil circuit control of the oil cylinder 1, but also improves the reliability of the operation of the oil cylinder 1. The fluctuation of the oil pressure of the hydraulic system will not cause the change of the clamping force of the chuck, avoiding the influence of the adjustment and the oil pressure fluctuation of the hydraulic system on the clamping force of the chuck, and ensuring the normal rolling of the steel pipe for a long time.

[0040] As Figure 5 shown in the figure, when the steel pipe rolling is completed and the chuck needs to be opened, the swing frame 10 has to swing from the chuck clamping position 11 to the chuck release position 7. The operation process is as follows: the piston rod of the oil cylinder 1 retracts, the telescopic rod 6 retracts with the piston rod, the nut 9 fixed on the telescopic rod 6 contacts the sliding sleeve 8 and drives the sliding sleeve 8 to move. The sliding sleeve 8 slides to the contact surface of the limit frame 5 and pushes the limit frame 5. The swing frame toggle pins 13 installed on both sides of the limit frame 5 push the swing frame 10 to swing around the center of the fixed pin 12. The swing frame 10 swings from the chuck clamping position 11 to the chuck release position 7, realizing the relaxation operation of the chuck on the steel pipe.

[0041] Compared with the prior art, the present invention changes the connection mode between the swing frame 10 and the oil cylinder 1. In the prior art, the I-shaped joint 15 is directly connected to the oil cylinder 1 through the connecting pin 16. In the present invention, a telescopic rod 6 is installed on the piston rod of the oil cylinder 1, and a spring 4, a limit frame 5, a sliding sleeve 8, and a nut 9 are installed on the telescopic rod 6. A fixed pin 12 and a swing frame toggle pin 13 are provided on the swing frame 10. Through the combined action of each component, the sliding range of the limit frame 5 can be controlled, and then the swing range of the swing frame 10 can be determined. Finally, the clamping force of the chuck on the steel pipe is constantly controlled by the spring force, avoiding the influence of the change of the oil pressure of the oil cylinder on the clamping force of the chuck, and ensuring the normal rolling of the steel pipe for a long time.

[0042] Embodiment 2

[0043] A cold rolling mill for steel pipes includes a chuck swing elastic driving device in Embodiment 1.

[0044] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. For those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model.

Claims

1. A chuck swing elastic drive device, characterized in that: It includes an oil cylinder, an elastic part, a limit frame, a telescopic rod, a return mechanism and a swing frame; Wherein, the oil cylinder comprises a piston rod, and the piston rod is fixedly connected to the telescopic rod in the extension direction; the limit frame is a hollow structure, and is through in the first direction and the second direction, and the limit frame is sleeved on the telescopic rod along the first direction and can slide on the telescopic rod; the elastic member is sleeved on the telescopic rod and is located between the end of the telescopic rod connected to the piston rod and the limit frame, and the extension of the piston rod can compress the elastic member and push the limit frame to slide along the first direction; the return mechanism is fixed on the telescopic rod and is located at the end away from the piston rod; One end of the swing frame passes through the limit frame along the second direction and is movably connected to the limit frame. The swing frame can rotate around the other end of the swing frame as the limit frame slides in the first direction. The swing frame is connected to a chuck.

2. A chuck swing elastic drive device according to claim 1, characterized in that: The swing frame includes a driving arm at one end, and the limiting frame is equipped with a fixing mechanism and a swing frame driving pin, and the swing frame driving pin is connected to the driving arm and fixed to the limiting frame through the fixing mechanism.

3. A chuck swing elastic drive device according to claim 2, characterized in that: The tossing arm is provided with a waist-shaped hole, and the tossing pin of the swing frame passes through the waist-shaped hole and the limiting frame in sequence and is fixed to the fixing mechanism.

4. The chuck swing elastic drive device according to claim 2, characterized in that: There are two groups of the lever arms, and a groove is formed in the middle of the two groups of the lever arms, and the telescopic rod passes through the groove; each group of the lever arms is correspondingly provided with a group of the fixing mechanism and the swing frame toggle pins, and the two groups of the swing frame toggle pins are symmetrically installed on both sides of the telescopic rod.

5. The chuck swing elastic drive device according to claim 1, characterized in that: The telescopic rod extends radially along one end connected to the piston rod to form a step structure, and the elastic member is located between the step structure and the limiting frame.

6. A chuck swing elastic drive device according to claim 5, characterized in that: The elastic member is a spring.

7. A chuck swing elastic drive device according to claim 6, characterized in that: A receiving groove is provided on one side of the step structure of the telescopic rod facing the limiting frame, and one end of the spring is fixed in the receiving groove.

8. The chuck swing elastic drive device according to claim 1, characterized in that: The telescopic rod is provided with a thread, and the return mechanism is a nut, and the nut is matched with the thread of the telescopic rod.

9. The chuck swing elastic drive device according to claim 1, characterized in that: A support frame is provided at one side of the piston rod of the oil cylinder, a cavity is formed inside the support frame and a through hole is provided along the first direction, and the piston rod is located in the cavity when extended.

10. A steel tube cold rolling mill, characterized in that: It comprises the chuck swing elastic drive device as described in any one of claims 1-9.

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