Rotation limiting device and application

Abstract

The invention provides a rotation limiting device and application thereof. The device comprises a swinging body, a first limiting part, a second limiting part, a first position recognition unit, a second position recognition unit, a swinging body reset unit and a blocking part for preventing the swinging body from excessively rotating along with a rotating body. A swing shaft of the swing body is fixed to a rotating body, the first limiting component and the second limiting component are fixed to the rotating body, and the stopping portion of the first limiting component and the stopping portion of the second limiting component form two-limit positions of the swing stroke of the swing body when the swing body swings along the swing shaft of the swing body relative to the rotating body. The two limit positions are a first limit position and a second limit position; the first position identification unit and the second position identification unit are respectively used for identifying and / or warning the position change or the state change of the swinging piece relative to the second limit position; the swing body reset unit is used for middle position reset driving when the swing body deviates from the middle position of the stroke of the swing body.

Description

Technical Field

[0001] The present invention relates to a rotation limiting device and its application, which is used in the production and processing of steel pipes or other tubular bar products, and realizes the rotation of the end of the steel pipe through auxiliary devices such as robots, so as to realize tasks such as detection and processing. Background Art

[0002] In the steel pipe and bar production industry, it is necessary to perform surface quality inspection and key parameter measurement on the ends of steel pipes and bars during production. Generally, the fixed parts are fixed, and other devices such as testing instruments are installed on the rotating parts. The rotating parts rotate more than 360 degrees around the steel pipe or bar to complete the inspection of the entire surface of the steel pipe and bar end.

[0003] The rotating parts in the prior art basically use programs and manual methods to control the rotation angle. However, due to inertia and the randomness of manual control, the rotation angle may deviate and cannot stop rotating within a limited range.

[0004] Reference Figure 1 In the commonly used rotation detection device shown in the figure, since the detection device is integrated with control cables and air pipes and other wiring harnesses, which are then connected to the fixed part 22, the rotation angle of the rotating part 21 is limited to a certain range and cannot rotate without limit, otherwise it is easy to break the cables and air pipes and other wiring harnesses, damaging the equipment. Figure 1 It can be seen that when the rotating member 21 rotates excessively, the cables 23 and other wiring harnesses on the rotating member 21 will be restricted, and in extreme cases, the wiring harnesses will be pulled or even broken. Obviously, the existing technology cannot effectively achieve the above function of controlling the rotation angle. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies in the prior art and provide a rotation limit device which can prevent excessive rotation of a rotating part and protect the safety of rotation detection transposition.

[0006] The technical problem to be solved can be implemented through the following technical solutions.

[0007] A rotation limiting device, characterized by comprising:

[0008] a swinging body, the swinging axis of which is fixed on a rotating body, and

[0009] A first limiting component and a second limiting component, wherein the first limiting component and the second limiting component are fixed to the rotating body, and the stopper of the first limiting component and the stopper of the second limiting component form two limit positions of the swing stroke of the swing body when the swing body swings along its swing axis relative to the rotating body; the two limit positions are the first limit position and the second limit position; and

[0010] a first position recognition unit and a second position recognition unit, the first position recognition unit and the second position recognition unit are used to recognize and / or warn of position changes or state changes of the swing member relative to the first limit position and the second limit position, respectively; and

[0011] A swing body reset unit, the swing body reset unit is used for the swing body to reset the middle position when it deviates from the middle position of its stroke; and

[0012] A blocking member is provided to prevent the swinging body from excessively rotating with the rotating body.

[0013] Preferably, a connecting line between the first limiting component and the second limiting component passes through the swing axis of the swing body.

[0014] As a preferred embodiment of the present invention, the first position identification unit is a first limit proximity switch, and the second position identification unit is a second limit proximity switch.

[0015] Further preferably, the first limit proximity switch and the second limit proximity switch are fixed on a mounting base, and the mounting base is fixed on the rotating body.

[0016] Further preferably, an angle between a line connecting the first limit proximity switch and the swing axis of the swing body and a line connecting the second limit proximity switch and the swing axis of the swing body is 0-90°.

[0017] Further preferably, the angle between the line connecting the first limit proximity switch and the swing axis of the swing body and the line connecting the first limit component and the swing axis of the swing body is 0-45°; the angle between the line connecting the second limit proximity switch and the swing axis of the swing body and the line connecting the second limit component and the swing axis of the swing body is 0-45°.

[0018] Further preferably, the swing body resetting unit is a tension spring, one end of the tension spring is fixed to the swing body, and the other end of the tension spring is fixed to the swing shaft.

[0019] As a further improvement of the present invention, the swing body is divided into a first end close to the swing body reset unit and a second end away from the swing body reset unit with the swing axis as the boundary, and the blocking component is arranged in the area corresponding to the annular belt formed by the second end rotating with the rotating body.

[0020] Preferably, the swing body is a T-shaped swing rod.

[0021] Another technical problem to be solved by the present invention is to provide an application of the aforementioned rotation limit device in the detection or processing of steel pipes or bars.

[0022] The rotation limit device using the above technical solution can achieve the limiting effect of the positive and negative directions of the rotating parts, can avoid the function of excessive rotation, and limit the rotation range. It can avoid damage to other parts with limited rotation such as wiring harnesses. It has the following characteristics and beneficial effects:

[0023] (1) By adjusting the position of the positive and negative proximity switches, the signal position of the soft limit can be adjusted to achieve the specified rotation angle range.

[0024] (2) By adjusting the installation position of the positive and negative mechanical limit posts, the stop position of the hard limit can be adjusted to achieve the specified rotation angle protection range.

[0025] (3) The tension spring can ensure that the T-shaped swing arm returns to the middle position and remains in the middle position under the action of the reset force. It is not affected by the posture of the rotating body during the rotation process, and the T-shaped swing arm is prevented from shaking under the action of gravity, thereby avoiding the false sending of soft limit signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a commonly used rotation detection device;

[0027] Figure 2 It is a schematic diagram of the overall structure and detection application of the rotation limit device of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the rotation limiting device of the present invention;

[0029] Figure 4 It is a schematic diagram of the position of the rotation limit device of the present invention;

[0030] Figure 5 It is a schematic diagram of the soft limit position of the rotation limit device of the present invention;

[0031] Figure 6 It is a schematic diagram of the hard limit position of the rotation limit device of the present invention;

[0032] In the figure: 1. Proximity switch mounting bracket; 2. Negative limit proximity switch; 3. Positive limit proximity switch; 4. Fixed stop bar; 5. T-shaped swing bar; 51. Hook; 6. Fastening nut; 7. Positive limit mechanical column; 8. Negative limit mechanical column; 9. Tension spring;

[0033] 10. Steel pipe or bar; 11. Detection device; 12. Rotating body; 13. Fixed body; 14. Rotating shaft; 15. Rotation limiting device; 16. Annular belt;

[0034] 21. Rotating part; 22. Fixed part; 23. Cable; DETAILED DESCRIPTION

[0035] The specific implementation modes of the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Reference Figures 2 to 6 The rotation limiting device and its application shown in the figure, the rotation limiting device 15 is installed on the rotating body 12, and rotates with the rotating body 12. The fixed stop rod 4 is installed on the fixed body 13 and is fixed.

[0037] The rotation limit transposition 15 mainly includes a proximity switch mounting bracket 1 and a T-shaped swing rod 5. The proximity switch mounting bracket 1, which is generally in a fan-shaped structure, is symmetrically mounted with a positive limit proximity switch 3 and a negative limit proximity switch 2 on opposite sides. The T-shaped swing rod 5 is mounted at the center of the rotation limit device. The T-shaped swing rod 5 has a swing axis (i.e., the fastening axis position of the fastening nut 6 in the figure), and the position of the swing axis is preferably at the center of the fan-shaped arc of the proximity switch mounting bracket 1. One end of the T-shaped swing rod 5 is connected to the middle position of the proximity switch mounting bracket 1 through a tension spring 9, and the middle position is also equivalent to the symmetrical middle position of the positive limit proximity switch 3 and the negative limit proximity switch 2; the other end of the T-shaped swing rod 5 is formed by two hooks 51 of its "T"-shaped head. That is, one end of the tension spring 5 is connected to the other end of the T-shaped swing rod and fixed on the limit proximity switch mounting bracket. Accordingly, the positive limit mechanical column 7 and the negative limit mechanical column 8 are symmetrically mounted on the left and right sides of the T-shaped swing rod to prevent the swing rod from excessive rotation. After the rotation limit device is installed as a whole, the position diagram of the ends of the round tube and the rod is shown in Figure 2 shown.

[0038] The position relationship of the main devices of this scheme is shown in Figure 4 As shown, the positive limit mechanical column 7 and the negative limit mechanical column 8 are on the opposite side of the fastening nut 6; the positive limit mechanical column 7 and the negative limit mechanical column 8 are both at the outer ends of the corresponding positive limit proximity switch 3 and the negative limit proximity switch 2 (the outer ends of the connection line between the proximity switch and the swing arm shaft); the two proximity switches form a symmetrical relationship with the T-shaped swing arm 5; the angle between the proximity switch on one side (the negative limit proximity switch 2 or the positive limit proximity switch 3) and the T-shaped swing arm 5 is A, which depends on the size of the selected buffer zone and is usually set at 0- The angle between the proximity switch on one side (negative limit proximity switch 2 or positive limit proximity switch 3) and the straight line where the fastening nut 6, the positive limit mechanical column 7, and the negative limit mechanical column 8 are located (that is, the axis of the fastening nut 6, the positive limit mechanical column 7 and the negative limit mechanical column 8 in this embodiment can be on a straight line, of course, they can also be on a different straight line) is B, which determines the limited rotation range and is usually set to be adjustable within 0-45°, which can be adjusted according to actual process needs; the fixed stop rod 4 is installed on the fixed body 13 (see Figure 2), but needs to be located within the rotation range of the limit device on the rotating body 12 (that is, the fixed gear lever 4 needs to be set within the rotation range of the T-shaped swing lever from the rotating shaft to the end of the hook head 51 side that rotates with the rotating body 4), that is Figure 4 In the annular zone 16 interval ( Figure 4 The area before the two dotted circles in the figure).

[0039] The specific working process of the rotation limit device is as follows:

[0040] (1) When the rotating body rotates to a position close to the limit, the fixed stopper 4 moves the T-shaped swinging rod 5. After the rotation continues, the T-shaped swinging rod 5 swings, and the tension spring 9 is deformed by tension.

[0041] (2) After the T-shaped swing rod 5 swings to the soft limit position (which can be understood as the position about to reach the hard blocking limit), the limit position proximity switch (positive limit proximity switch 3) senses the head of the T-shaped swing rod 5 (here refers to the end where the hook head 5 is not located), and can send a signal to the controller such as the PLC to stop the rotation. This position is the soft limit position, such as Figure 5 shown.

[0042] (3) After the T-shaped swing arm 5 swings to the soft limit position, if the rotating body 12 continues to rotate, the T-shaped swing arm 5 swings to the hard limit position (which can be understood as the position of hard blocking limit) and contacts the mechanical limit column (positive limit mechanical column 7), and cannot continue to swing. This position is the hard limit position. Figure 6 shown.

[0043] (4) After the T-shaped swinging rod 5 reaches the soft limit position or the hard limit position, if the limit is to be released, the rotating body 12 can rotate in the opposite direction. Under the tension of the tension spring 9, the T-shaped swinging rod 5 swings in the opposite direction until it is in the middle position (return position).

[0044] (5) After the rotating body 12 rotates 360 degrees, the fixed stopper 4 contacts the T-shaped swinging rod 5 in the opposite direction (i.e., from the hook 5 on one side to the hook 5 on the other side). As described above, the soft limit position and hard limit position effects of the limit position on the other side can be achieved.

[0045] After the rotary limit device of the present invention is tried in the end detection process of a steel pipe production line, the detection device needs to rotate 360° around the end of the steel pipe. The detection device is installed on the rotating body, and the rotating body adopts the rotary limit device. The positive and negative limit proximity switches are on both sides of the mounting bracket, with the central axis of the mounting bracket as the starting edge. The angle between the proximity switch installation position and the central axis is adjustable by 0-45°, and the limit mechanical column is adjustable by 0-45° on the outside of the corresponding proximity switch. The setting of the proximity switch and the limit column is completed according to the size of the detection device to ensure that the optional installation process covers the 360° range of the steel pipe end. At the same time, it also ensures that the soft limit will hit the hard limit in time to stop rotation even if it is broken through, effectively protecting the safety of the rotation detection transposition.

[0046] This device can be widely used in various production lines that need to rotate the ends of steel pipes and bars. It is also suitable for any device that has limited requirements on the rotation angle range.

Claims

1. A rotation limiting device, characterized in that: include: a swinging body, the swinging axis of which is fixed on a rotating body, and A first limiting component and a second limiting component, wherein the first limiting component and the second limiting component are fixed to the rotating body, and the stopper of the first limiting component and the stopper of the second limiting component form two limit positions of the swing stroke of the swing body when the swing body swings along its swing axis relative to the rotating body; the two limit positions are the first limit position and the second limit position; and a first position recognition unit and a second position recognition unit, the first position recognition unit and the second position recognition unit are used to recognize and / or warn of position changes or state changes of the swing member relative to the first limit position and the second limit position, respectively; and A swing body reset unit, the swing body reset unit is used for the swing body to reset the middle position when it deviates from the middle position of its stroke; and A blocking member is provided to prevent the swinging body from excessively rotating with the rotating body.

2. The rotation limiting device according to claim 1, characterized in that: A connecting line between the first limiting component and the second limiting component passes through the swing axis of the swing body.

3. The rotation limiting device according to claim 1, characterized in that: The first position identification unit is a first limit proximity switch, and the second position identification unit is a second limit proximity switch.

4. The rotation limiting device according to claim 3, characterized in that: The first limit proximity switch and the second limit proximity switch are fixed on a mounting base, and the mounting base is fixed on the rotating body.

5. The rotation limiting device according to claim 3, characterized in that: The angle between the line connecting the first limit proximity switch and the swing axis of the swing body and the line connecting the second limit proximity switch and the swing axis of the swing body is 0-90°.

6. The rotation limiting device according to claim 3, characterized in that: The angle between the line connecting the first limit proximity switch and the swing axis of the swing body and the line connecting the first limit component and the swing axis of the swing body is 0-45°; the angle between the line connecting the second limit proximity switch and the swing axis of the swing body and the line connecting the second limit component and the swing axis of the swing body is 0-45°.

7. The rotation limiting device according to claim 1 or 3, characterized in that: The swing body resetting unit is a tension spring, one end of which is fixed on the swing body, and the other end of which is fixed on the swing shaft.

8. The rotation limiting device according to claim 7, characterized in that: The swing body is divided into a first end close to the swing body reset unit and a second end away from the swing body reset unit with the swing axis as the boundary, and the blocking component is arranged in the area corresponding to the annular belt formed by the second end rotating with the rotating body.

9. The rotation limiting device according to claim 1, characterized in that: The swinging body is a T-shaped swinging rod.

10. Use of the rotation limit device according to any one of claims 1 to 9 in the detection or processing of steel pipes or bars.

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