Core rod tail handle positioning device

Abstract

The utility model discloses a core rod tail handle positioning device which comprises a machine frame, a swing arm, a connecting rod assembly, a telescopic driving cylinder and a limiting protection mechanism. Wherein the swing arm is connected to the machine frame in a swinging mode, the swing arm is provided with a positioning position which swings upwards in place and an avoiding position which swings downwards in place, and when the swing arm swings upwards to the positioning position, the swing arm is used for abutting against a tail handle on a rebounded moving core rod so as to position the core rod; one end of the connecting rod assembly is hinged to the swing arm, the other end of the connecting rod assembly is hinged to the telescopic driving cylinder, and the telescopic driving cylinder is connected to the rack. The limiting protection mechanism is installed between the connecting rod assembly and the rack and used for limiting the connecting rod assembly to continue to move upwards when the swing arm swings upwards to the positioning position. According to the utility model, the telescopic driving cylinder can be protected, and the telescopic driving cylinder is prevented from being damaged by the impact force generated by the impact of the core rod.

Description

Technical Field

[0001] The utility model relates to a core rod tail handle positioning device. Background Art

[0002] At present, the PQF continuous rolling mill is a device for producing seamless steel pipes. In the PQF continuous rolling mill, after the lubricated mandrel moves forward to the front stop point, it will hit the buffer positioning device. The buffer positioning device has a buffer and under the reverse thrust of the buffer, the mandrel will stop moving forward and rebound backward for a distance. Since the distances of the mandrel rebounding backward are different, the positioning accuracy of the mandrel is deteriorated. Therefore, in order to improve the positioning accuracy of the mandrel, a tail handle positioning device is usually added to the PQF continuous rolling mill. The tail handle positioning device can resist the tail handle of the mandrel when the mandrel rebounds and positions the tail handle, thereby improving the positioning accuracy of the mandrel. However, the tail handle positioning device is driven by a telescopic drive cylinder, which can be but not limited to a pneumatic cylinder and a hydraulic cylinder. Due to the large rebound kinetic energy of the mandrel, the tail handle positioning device will be strongly hit by the mandrel when it resists the mandrel that rebounds backward. The impact force generated by the collision will be transmitted to the telescopic drive cylinder, which will cause the telescopic drive cylinder to be easily damaged. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a core rod tail handle positioning device, which can protect the telescopic drive cylinder and prevent the telescopic drive cylinder from being damaged by the impact force generated by the core rod collision.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a mandrel tail handle positioning device, which includes a frame, a swing arm, a connecting rod assembly, a telescopic drive cylinder and a limit protection mechanism;

[0005] The swing arm is swingably connected to the frame, and has a positioning position for swinging upwards and a avoiding position for swinging downwards. When the swing arm swings upwards to the positioning position, it is used to abut against the tail handle on the rebounding mandrel to position the mandrel;

[0006] One end of the connecting rod assembly is hinged to the swing arm, and the other end of the connecting rod assembly is hinged to the telescopic drive cylinder, the telescopic drive cylinder is connected to the frame, and the telescopic drive cylinder is used to drive the swing arm to swing through the connecting rod assembly;

[0007] The position limiting protection mechanism is installed between the connecting rod assembly and the frame and is used to limit the connecting rod assembly from continuing to move upward when the swing arm swings upward to the positioning position.

[0008] Furthermore, the core rod tail handle positioning device also includes an elastic mechanism for driving the swing arm to swing upward to the positioning position through elastic force.

[0009] Further, the upper end of the connecting rod assembly is hinged to the swing arm, the lower end of the connecting rod assembly is hinged to the upper end of the telescopic drive cylinder, the lower end of the telescopic drive cylinder is hinged to the frame, and the telescopic drive cylinder is used to drive the connecting rod assembly to move downward and then drive the swing arm to swing downward to the avoidance position;

[0010] The elastic mechanism is connected to the connecting rod assembly and is used to drive the connecting rod assembly to move upward through elastic force, thereby driving the swing arm to swing upward to the positioning position.

[0011] A specific structure of the elastic mechanism is further provided, wherein the elastic mechanism comprises an upper abutment member, a lower abutment member and an elastic member;

[0012] The upper abutment member is connected to the connecting rod assembly;

[0013] The lower abutment member is fixedly arranged;

[0014] The elastic member is located between the upper abutment member and the lower abutment member, the upper end of the elastic member abuts against the upper abutment member, and the lower end of the elastic member abuts against the lower abutment member. The elastic member is used to drive the connecting rod assembly to move upward through elastic force and then drive the swing arm to swing upward to the positioning position.

[0015] A specific structure of the limit protection mechanism is further provided, and the limit protection mechanism includes a limit seat and a limit block; wherein the limit seat is connected to the frame, and the limit block is connected to the connecting rod assembly, and the limit block is used to resist the lower end surface of the limit seat when the swing arm swings upward to the positioning position, thereby limiting the connecting rod assembly from continuing to move upward.

[0016] Furthermore, a through hole is provided in the limiting seat, and the connecting rod assembly passes through the through hole.

[0017] A specific structure of the connecting rod assembly is further provided, wherein the connecting rod assembly comprises a rod body, an upper rod head and a lower rod head;

[0018] The upper end of the rod body is connected to the upper rod head;

[0019] The lower end of the rod body is connected to the lower rod head;

[0020] The upper rod head is hinged on the swing arm, and the lower rod head is hinged to the upper end of the telescopic driving cylinder.

[0021] Furthermore, the lower end of the rod body is threadedly connected to the lower rod head and fixed by a cotter pin.

[0022] Furthermore, a baffle is provided on the swing arm, and the baffle is used to abut against the tail handle on the mandrel that rebounds and moves when the swing arm swings to the positioning position to position the mandrel.

[0023] Furthermore, a V-shaped groove is provided on one end of the baffle plate facing the core rod.

[0024] After adopting the above technical solution, when the PQF continuous tube mill produces seamless steel pipes, the mandrel needs to be lubricated to form a lubricating section on the mandrel. When the mandrel moves from the top of the swing arm to the right, the lubricating section in the mandrel will first pass through the top of the swing arm. At this time, the swing arm needs to be swung downward to the avoidance position to ensure that the swing arm will not contact the lubricating section on the mandrel, thereby protecting the graphite lubricating coating on the surface of the lubricating section from peeling off. After the lubricating section is completely passed, the tail handle on the mandrel without lubrication will pass through the top of the swing arm. At this time, the swing arm needs to be swung upward to the positioning position, and at this time, the mandrel will move to the right to the front stop point and then hit the buffer positioning device. The buffer positioning device has a buffer and under the reverse thrust of the buffer, the mandrel will stop moving to the right and rebound to the left for a distance. At this time, the swing arm located at the positioning position will resist the tail handle on the mandrel that rebounds to the left and locate the tail handle, thereby accurately locating the position of the mandrel. Furthermore, since the rebound kinetic energy of the mandrel is relatively large, a strong impact force will be generated when the rebounded mandrel hits the swing arm to the left. At this time, if there is no limit protection mechanism, the impact force of the mandrel will drive the swing arm to swing upward, and then drive the connecting rod assembly to continue to move upward, and then transmit the impact force to the telescopic drive cylinder through the connecting rod assembly, causing the telescopic drive cylinder to be easily damaged. In this embodiment, by setting the limit protection mechanism, when the mandrel rebounds and hits the swing arm in the positioning position, the limit protection mechanism will limit the connecting rod assembly from continuing to move upward at this time, so that the swing arm will not continue to swing upward and the impact force cannot be transmitted to the telescopic drive cylinder through the connecting rod assembly, thereby protecting the telescopic drive cylinder from being damaged by abnormal force, and protecting the telescopic drive cylinder from being damaged by the impact force generated by the mandrel collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the mandrel tail handle positioning device of the utility model when the swing arm is located at the positioning position;

[0026] Figure 2 It is a structural schematic diagram of the mandrel tail handle positioning device of the utility model when the swing arm is in the avoidance position;

[0027] Figure 3 for Figure 2 Partial detail drawing. DETAILED DESCRIPTION

[0028] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0029] like Figures 1 to 3 As shown, a mandrel tail handle positioning device comprises a frame 1, a swing arm 2, a connecting rod assembly 3, a telescopic drive cylinder 4 and a limit protection mechanism 5;

[0030] The swing arm 2 is swingably connected to the frame 1, and has a positioning position for swinging upward and a avoiding position for swinging downward. When the swing arm 2 swings upward to the positioning position, it is used to abut against the tail handle 7 on the rebounding mandrel 6 to position the mandrel 6;

[0031] One end of the connecting rod assembly 3 is hinged to the swing arm 2, and the other end of the connecting rod assembly 3 is hinged to the telescopic drive cylinder 4. The telescopic drive cylinder 4 is connected to the frame 1, and the telescopic drive cylinder 4 is used to drive the swing arm 2 to swing through the connecting rod assembly 3;

[0032] The position limiting protection mechanism 5 is installed between the connecting rod assembly 3 and the frame 1 and is used to limit the connecting rod assembly 3 from continuing to move upward when the swing arm 2 swings upward to the positioning position.

[0033] Specifically, when the PQF continuous tube mill produces seamless steel pipes, the mandrel 6 needs to be lubricated to form a lubricating section on the mandrel 6. When the mandrel 6 moves from the top of the swing arm 2 to the right, the lubricating section in the mandrel 6 will first pass through the top of the swing arm 2. At this time, the swing arm 2 needs to be swung downward to the avoidance position to ensure that the swing arm 2 will not contact the lubricating section on the mandrel 6, thereby protecting the graphite lubricating coating on the surface of the lubricating section from peeling off. After the lubricating section has completely passed through, the tail handle 7 on the mandrel 6 that is not lubricated will pass through the top of the swing arm 2. At this time, the swing arm 2 needs to be swung upward to the positioning position, and at this time, the mandrel 6 will move to the right to the front dead point and then hit the buffer positioning device. The buffer positioning device has a buffer and under the reverse thrust of the buffer, the mandrel 6 will stop moving to the right and rebound to the left for a distance. At this time, the swing arm 2 located at the positioning position will abut against the tail handle 7 on the mandrel 6 that rebounds to the left and locate the tail handle 7, thereby accurately locating the position of the mandrel 6. To be more specific, since the rebound kinetic energy of the core rod 6 is relatively large, when the rebounded core rod 6 hits the swing arm 2 to the left, a strong impact force will be generated. At this time, if there is no limit protection mechanism 5, the impact force of the core rod 6 will drive the swing arm 2 to swing upward, and then drive the connecting rod assembly 3 to continue to move upward, and then transmit the impact force to the telescopic drive cylinder 4 through the connecting rod assembly 3, causing the telescopic drive cylinder 4 to be easily damaged. In this embodiment, by providing the limit protection mechanism 5, when the core rod 6 rebounds and hits the swing arm 2 in the positioning position, since the limit protection mechanism 5 will limit the connecting rod assembly 3 from continuing to move upward at this time, the swing arm 2 will not continue to swing upward and the impact force cannot be transmitted to the telescopic drive cylinder 4 through the connecting rod assembly 3, thereby protecting the telescopic drive cylinder 4 from being damaged by abnormal force, and being able to protect the telescopic drive cylinder 4 from being damaged by the impact force generated by the impact of the core rod 6. Among them, the attached Figure 1 The swing arm 2 is located at the positioning position, Figure 2 The swing arm 2 is located at the avoidance position, and the specific structure of the buffer positioning device can refer to a continuous rolling mill mandrel 6 positioning device disclosed in Chinese patent announcement number CN217831234U.

[0034] like Figures 1 to 3As shown, the mandrel tail handle positioning device may also include an elastic mechanism 8 for driving the swing arm 2 to swing upward to the positioning position through elastic force; in this embodiment, the process of the swing arm 2 swinging downward to the avoidance position is that the telescopic drive cylinder 4 drives the connecting rod assembly 3 to move downward and then drives the swing arm 2 to swing downward to the avoidance position by overcoming the elastic force of the elastic mechanism 8. The process of the swing arm 2 swinging upward to the positioning position is that the telescopic drive cylinder 4 is out of air and loses power and then the elastic mechanism 8 drives the swing arm 2 to swing upward to the positioning position through elastic force. Of course, in some embodiments, the process of the swing arm 2 swinging upward to the positioning position may also be that the telescopic drive cylinder 4 extends and drives the connecting rod assembly 3 to move upward, and the swing arm 2 swings upward to the positioning position under the joint drive of the telescopic drive cylinder 4 and the elastic mechanism 8.

[0035] like Figures 1 to 3 As shown, the upper end of the connecting rod assembly 3 is hinged to the swing arm 2, the lower end of the connecting rod assembly 3 is hinged to the upper end of the telescopic drive cylinder 4, the lower end of the telescopic drive cylinder 4 is hinged to the frame 1, and the telescopic drive cylinder 4 is used to drive the connecting rod assembly 3 to move downward and then drive the swing arm 2 to swing downward to the avoidance position;

[0036] The elastic mechanism 8 is connected to the connecting rod assembly 3 and is used to drive the connecting rod assembly 3 to move upward through elastic force, thereby driving the swing arm 2 to swing upward to the positioning position; in the present embodiment, the telescopic drive cylinder 4 is an air cylinder, and the air source of the air cylinder is controlled by an electromagnetic valve. When driving the swing arm 2 to swing downward to the avoidance position, the electromagnetic valve is energized to cause the cylinder to retract, thereby driving the connecting rod assembly 3 to move downward and overcome the elastic force of the elastic mechanism 8, thereby driving the swing arm 2 to swing downward to the avoidance position; when driving the swing arm 2 to swing upward to the positioning position, the electromagnetic valve loses power and thereby causes the air cylinder to lose force. Driven by the elastic force of the elastic mechanism 8, the connecting rod assembly 3 moves upward and thereby causes the swing arm 2 to swing upward to the positioning position.

[0037] like Figures 1 to 3 As shown, the elastic mechanism 8 may include an upper abutment member 9, a lower abutment member 10 and an elastic member 11;

[0038] The upper abutment member 9 is connected to the connecting rod assembly 3;

[0039] The lower abutment member 10 is fixedly arranged;

[0040] The elastic member 11 is located between the upper abutment member 9 and the lower abutment member 10, the upper end of the elastic member 11 abuts against the upper abutment member 9, and the lower end of the elastic member 11 abuts against the lower abutment member 10. The elastic member 11 is used to drive the connecting rod assembly 3 to move upward through elastic force and then drive the swing arm 2 to swing upward to the positioning position; in this embodiment, the elastic member 11 is a spring sleeved on the outside of the connecting rod assembly 3.

[0041] like Figures 1 to 3 As shown, the limit protection mechanism 5 may include a limit seat 12 and a limit block 13; wherein, the limit seat 12 is connected to the frame 1, and the limit block 13 is connected to the connecting rod assembly 3, and the limit block 13 is used to abut against the lower end surface of the limit seat 12 when the swing arm 2 swings upward to the positioning position, thereby limiting the connecting rod assembly 3 from continuing to move upward; specifically, when the swing arm 2 swings upward, the connecting rod assembly 3 also moves upward, and when the swing arm 2 swings to the positioning position, the limit block 13 abuts against the lower end surface of the limit seat 12, thereby limiting the connecting rod assembly 3 from continuing to move upward. At this time, when the mandrel 6 rebounds to the left and hits the swing arm 2 at the positioning position, the impact force generated by the mandrel 6 cannot be transmitted to the telescopic drive cylinder 4 through the connecting rod assembly 3 because the limit stopper 13 abuts against the lower end surface of the limit seat 12 and limits the connecting rod assembly 3 from continuing to move upward. At the same time, the swing arm 2 cannot continue to swing upward, thereby protecting the telescopic drive cylinder 4 from abnormal force and damage. In this embodiment, the lower abutment 10 is connected to the limit seat 12.

[0042] like Figure 3 As shown, the limiting seat 12 may be provided with a through hole 14 , and the connecting rod assembly 3 passes through the through hole 14 ; specifically, the connecting rod assembly 3 also passes through the lower abutment member 10 .

[0043] like Figures 1 to 3 As shown, the connecting rod assembly 3 may include a rod body 15, an upper rod head 16 and a lower rod head 17;

[0044] The upper end of the rod body 15 is connected to the upper rod head 16;

[0045] The lower end of the rod body 15 is connected to the lower rod head 17;

[0046] The upper rod head 16 is hinged on the swing arm 2, and the lower rod head 17 is hinged to the upper end of the telescopic drive cylinder 4; specifically, the limit stopper 13 is connected to the lower rod head 17, and the rod body 15 passes through the through hole 14 and the lower abutment 10.

[0047] like Figures 1 to 3As shown, the lower end of the rod body 15 is threadedly connected to the lower rod head 17 and fixed by a cotter pin 18.

[0048] like Figure 1 , 2 As shown, a baffle 19 may be provided on the swing arm 2, and the baffle 19 is used to abut against the tail handle 7 on the core rod 6 that rebounds when the swing arm 2 swings to the positioning position to position the core rod 6.

[0049] In this embodiment, a V-shaped groove is provided on one end of the baffle 19 facing the core rod 6, so that the abutment contact area between the baffle 19 and the core rod 6 can be increased; in this embodiment, the maximum stroke of the up and down swing of the baffle 19 is 74mm, the stroke of the telescopic drive cylinder 4 is 30mm, and the repeat positioning accuracy of the core rod 6 is ≤10mm.

[0050] In summary, when the PQF continuous tube mill produces seamless steel pipes, the mandrel 6 needs to be lubricated to form a lubricating section on the mandrel 6. When the mandrel 6 moves from the top of the swing arm 2 to the right, the lubricating section in the mandrel 6 will first pass through the top of the swing arm 2. At this time, the swing arm 2 needs to be swung downward to the avoidance position to ensure that the swing arm 2 will not contact the lubricating section on the mandrel 6, thereby protecting the graphite lubricating coating on the surface of the lubricating section from peeling off. After the lubricating section has completely passed through, the unlubricated tail handle 7 on the mandrel 6 will pass through the top of the swing arm 2. At this time, the swing arm 2 needs to be swung upward to the positioning position, and at this time, the mandrel 6 will move to the right to the front dead point and then hit the buffer positioning device. The buffer positioning device has a buffer and under the reverse thrust of the buffer, the mandrel 6 will stop moving to the right and rebound to the left for a distance. At this time, the swing arm 2 located at the positioning position will resist the tail handle 7 on the mandrel 6 that rebounds to the left and position the tail handle 7, thereby accurately positioning the position of the mandrel 6. Furthermore, since the rebound kinetic energy of the mandrel 6 is relatively large, a relatively strong impact force will be generated when the rebounded mandrel 6 hits the swing arm 2 to the left. At this time, if there is no limit protection mechanism 5, the impact force of the mandrel 6 will drive the swing arm 2 to swing upward, and then drive the connecting rod assembly 3 to continue to move upward, and then transmit the impact force to the telescopic drive cylinder 4 through the connecting rod assembly 3, causing the telescopic drive cylinder 4 to be easily damaged. In this embodiment, by providing the limit protection mechanism 5, when the mandrel 6 rebounds and hits the swing arm 2 located in the positioning position, since the limit protection mechanism 5 will limit the connecting rod assembly 3 from continuing to move upward at this time, the swing arm 2 will not continue to swing upward and the impact force cannot be transmitted to the telescopic drive cylinder 4 through the connecting rod assembly 3, thereby protecting the telescopic drive cylinder 4 from being damaged by abnormal force, and protecting the telescopic drive cylinder 4 from being damaged by the impact force generated by the impact of the mandrel 6.

[0051] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mandrel tail handle positioning device, characterized in that: It comprises a frame (1), a swing arm (2), a connecting rod assembly (3), a telescopic drive cylinder (4) and a limit protection mechanism (5); The swing arm (2) is swingably connected to the frame (1), and the swing arm (2) has a positioning position for swinging upwards to a certain position and a avoiding position for swinging downwards to a certain position, and when the swing arm (2) swings upwards to the positioning position, it is used to abut against the tail handle (7) on the rebounding mandrel (6) to position the mandrel (6); One end of the connecting rod assembly (3) is hinged to the swing arm (2), and the other end of the connecting rod assembly (3) is hinged to the telescopic drive cylinder (4); the telescopic drive cylinder (4) is connected to the frame (1); the telescopic drive cylinder (4) is used to drive the swing arm (2) to swing through the connecting rod assembly (3); The position limiting protection mechanism (5) is installed between the connecting rod assembly (3) and the frame (1) and is used to limit the connecting rod assembly (3) from continuing to move upward when the swing arm (2) swings upward to the positioning position.

2. The mandrel tail handle positioning device according to claim 1, characterized in that: It also includes an elastic mechanism (8) for driving the swing arm (2) to swing upward to the positioning position through elastic force.

3. The mandrel tail handle positioning device according to claim 2, characterized in that: The upper end of the connecting rod assembly (3) is hinged to the swing arm (2), the lower end of the connecting rod assembly (3) is hinged to the upper end of the telescopic drive cylinder (4), the lower end of the telescopic drive cylinder (4) is hinged to the frame (1), and the telescopic drive cylinder (4) is used to drive the connecting rod assembly (3) to move downward and thereby drive the swing arm (2) to swing downward to the avoidance position; The elastic mechanism (8) is connected to the connecting rod assembly (3) and is used to drive the connecting rod assembly (3) to move upwards through elastic force, thereby driving the swing arm (2) to swing upwards to the positioning position.

4. The mandrel tail handle positioning device according to claim 3, characterized in that: The elastic mechanism (8) comprises an upper abutment member (9), a lower abutment member (10) and an elastic member (11); The upper abutment member (9) is connected to the connecting rod assembly (3); The lower abutment member (10) is fixedly arranged; The elastic member (11) is located between the upper abutment member (9) and the lower abutment member (10); the upper end of the elastic member (11) abuts against the upper abutment member (9), and the lower end of the elastic member (11) abuts against the lower abutment member (10); the elastic member (11) is used to drive the connecting rod assembly (3) to move upwards through elastic force, thereby driving the swing arm (2) to swing upwards to the positioning position.

5. The mandrel tail handle positioning device according to claim 1, characterized in that: The limit protection mechanism (5) comprises a limit seat (12) and a limit stopper (13); wherein the limit seat (12) is connected to the frame (1), and the limit stopper (13) is connected to the connecting rod assembly (3); the limit stopper (13) is used to abut against the lower end surface of the limit seat (12) when the swing arm (2) swings upward to the positioning position, thereby limiting the connecting rod assembly (3) from continuing to move upward.

6. The mandrel tail handle positioning device according to claim 5, characterized in that: The limiting seat (12) is provided with a through hole (14), and the connecting rod assembly (3) passes through the through hole (14).

7. The mandrel tail handle positioning device according to claim 1, characterized in that: The connecting rod assembly (3) comprises a rod body (15), an upper rod head (16) and a lower rod head (17); The upper end of the rod body (15) is connected to the upper rod head (16); The lower end of the rod body (15) is connected to the lower rod head (17); The upper rod head (16) is hinged on the swing arm (2), and the lower rod head (17) is hinged to the upper end of the telescopic drive cylinder (4).

8. The mandrel tail handle positioning device according to claim 7, characterized in that: The lower end of the rod body (15) is threadedly connected to the lower rod head (17) and is fixed by a cotter pin (18).

9. The mandrel tail handle positioning device according to claim 1, characterized in that: The swing arm (2) is provided with a baffle (19), and the baffle (19) is used to abut against the tail handle (7) on the core rod (6) that rebounds when the swing arm (2) swings to the positioning position, so as to position the core rod (6).

10. The mandrel tail handle positioning device according to claim 9, characterized in that: A V-shaped groove is provided on one end of the baffle (19) facing the core rod (6).

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