Material receiving positioning fixture and method of use thereof

Abstract

The application discloses a material receiving positioning clamp and a use method thereof. The material receiving positioning clamp comprises a connecting plate, a base symmetrically arranged at the bottom of the connecting plate, sliding parts symmetrically arranged at the two sides of the center position of the connecting line of the base and fixedly arranged at the bottom of the connecting plate, telescopic pushing parts arranged at the opposite ends of the sliding parts, movable clamping parts symmetrically arranged at the two sides of the center position of the connecting line of the sliding parts, wherein the movable clamping part comprises a pair of cross-arranged movable clamping arms, the top of the movable clamping arm is rotationally connected with the telescopic pushing part on the same side of the movable clamping arm, the middle positions of the movable clamping arms on the two sides of the connecting line of the base are connected through connecting rods, a supporting rod is arranged at the middle part of the telescopic pushing part at one end and rotationally connected with the middle part of the connecting rod at the other end, and rollers are arranged at the middle part and the bottom of the movable clamping arm and used for clamping U tubes. The application can be suitable for copper pipes of different specifications and shapes, can reduce the frequency of replacing the clamp and can improve the positioning precision.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a material receiving and positioning fixture and its usage method. Background Technology

[0002] In the production of air conditioner condensers and evaporators, copper tubes are a key component, and the accuracy of the tube-jointing and positioning after bending directly affects product quality and production efficiency. Currently, in the production process, long copper tubes are bent and output, and are handled manually or by traditional robotic arms. This is inefficient and prone to wear and tear, which can scratch workers. Furthermore, traditional joining and positioning fixtures often use rigid structures.

[0003] When operated manually, workers hold the copper tube and insert it into the fin hole, which is inefficient, prone to human error, and easily causes the copper tube to bend or be scratched due to fatigue.

[0004] When using semi-automatic equipment, which typically combines pneumatic clamps and conveyor belts, manual pre-positioning is required. This equipment cannot adapt to changes in pipe diameter and fin spacing, and adjustments are time-consuming when changing product models.

[0005] Due to the limitations of the rigid structure, the fixture is prone to slight displacement during the material receiving process, resulting in low positioning accuracy after the copper tube is bent.

[0006] Different specifications and shapes of copper tubes require different clamps, which increases production costs and time. Summary of the Invention

[0007] To address the technical problems of low efficiency, poor adaptability, and poor positioning accuracy caused by the current practice of mainly handling U-tubes manually and using traditional robotic arms, this invention provides a material receiving and positioning fixture and its usage method.

[0008] The present invention adopts the following technical solution:

[0009] The first aspect of this invention discloses a material receiving and positioning fixture, comprising:

[0010] Connecting plate;

[0011] The base is symmetrically located at the bottom of the connecting plate;

[0012] The sliding part is symmetrically arranged on both sides of the center position of the base connection line and is fixedly installed on the bottom of the connecting plate;

[0013] A telescopic pushing part is provided at one end of the sliding part facing each other;

[0014] The movable clamping part is symmetrically arranged on both sides of the center position of the connecting line of the sliding part. The movable clamping part includes a pair of movable clamping arms arranged in a cross manner. The top of the movable clamping arm is rotatably connected to the telescopic pushing part on the same side. The middle positions of the movable clamping arms on both sides of the connecting line of the base are connected by a connecting rod.

[0015] A support rod, one end of which is located in the middle of the telescopic push part, and the other end is rotatably connected to the middle of the connecting rod;

[0016] Rollers, located in the middle and bottom of the movable clamping arm, are used to clamp the U-tube.

[0017] According to the aforementioned material receiving and positioning fixture, the base is a telescopic component, and a rotating support component is fixedly provided at the bottom of the base.

[0018] According to the aforementioned receiving and positioning fixture, the pair of movable clamping arms are rotatably mounted on the rotating support at an intersecting position.

[0019] According to the aforementioned receiving and positioning fixture, the movable clamping arm includes: a first rotating movable clamping arm and a second rotating movable clamping arm;

[0020] The pair of first rotating movable clamping arms are arranged crosswise, and the top of the first rotating movable clamping arms is rotatably connected to the telescopic pushing part;

[0021] The bottom of the first rotating movable clamping arm is rotatably connected to the second rotating movable clamping arm;

[0022] The first rotating movable clamping arm and the second rotating movable clamping arm are connected by the connecting rod.

[0023] According to the material receiving and positioning fixture, the inner sides of the first rotating movable clamping arm and the second rotating movable clamping arm are set to be arc-shaped;

[0024] The curvature of the arc of the first rotating movable clamping arm is greater than that of the arc of the second rotating movable clamping arm.

[0025] According to the material receiving and positioning fixture, the roller is provided at the connection between the first rotating movable clamping arm and the second rotating movable clamping arm;

[0026] The roller is also provided at the bottom of the second rotating movable clamping arm.

[0027] According to the aforementioned material receiving and positioning fixture, the sliding part includes: a slide rail and a slider;

[0028] The slide rail is fixed to the bottom of the connecting plate, and the slider is disposed on the slide rail;

[0029] The telescopic pushing part is located on the slider.

[0030] According to the aforementioned receiving and positioning fixture, the telescopic pushing part includes: a telescopic rod and a pushing member;

[0031] One end of the telescopic rod is provided on the sliding part, and the other end is provided with a pusher parallel to the connection line of the base;

[0032] The two ends of the pusher are rotatably connected to the top of the movable clamping arm.

[0033] According to the aforementioned receiving and positioning fixture, the top of the connecting plate is mounted on a robotic arm or robotic hand.

[0034] The second aspect of this invention discloses a method of using a material receiving and positioning fixture, comprising the following steps:

[0035] The material receiving and positioning fixture is mounted on a robotic arm or robotic hand, and electrically connected to the slider of the sliding part through the robotic arm or robotic hand to drive the movement of the slider;

[0036] During clamping, the drive slider causes the telescopic push part to retract inward, making the opening below the connection position of the movable clamping arm larger. The telescopic push part drives the support rod to rotate, which in turn drives the connecting rod to move, making the opening of the second rotating movable clamping arm of the movable clamping arm even larger.

[0037] The robotic arm or robotic hand moves the receiving and positioning fixture to the position of the U-tube. After the roller in the middle of the movable clamping arm contacts the U-tube, the drive slider drives the telescopic push part to move outward, making the opening below the connection position of the movable clamping arm smaller. The telescopic push part drives the support rod to rotate, which in turn drives the connecting rod to move, making the opening of the second rotating movable clamping arm of the movable clamping arm even smaller, thereby clamping the U-tube.

[0038] After the U-tube is moved to the designated position, the drive slider causes the telescopic push part to retract inward, making the opening below the connection position of the movable clamping arm larger. The telescopic push part drives the support rod to rotate, which in turn drives the connecting rod to move, making the opening of the second rotating movable clamping arm of the movable clamping arm further larger, and the U-tube is lowered, completing one clamping and putting-back cycle.

[0039] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0040] The clamp contact body of the present invention adopts a roller design, which changes the surface contact to line contact compared with manual handling and traditional robotic arm handling, reducing the contact area and reducing damage and scratches to the surface of the U-tube.

[0041] This invention uses a sliding part to drive a telescopic pushing part, which in turn causes the opening of the movable clamping arm to increase or decrease. The telescopic pushing part drives a connecting rod through a support rod, which further increases or decreases the opening at the bottom of the movable clamping arm. Furthermore, by controlling the displacement of the slider of the sliding part, the maximum degree of the opening can be changed. Therefore, it can adapt to copper tubes of different specifications and shapes, reduce the frequency of changing clamps, and improve positioning accuracy. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a three-dimensional structural diagram of the material receiving and positioning fixture of the present invention;

[0044] Figure 2 This is a front view of the material receiving and positioning fixture of the present invention;

[0045] Figure 3 This is a side view of the material receiving and positioning fixture of the present invention;

[0046] Figure 4 This is a bottom view of the material receiving and positioning fixture of the present invention;

[0047] In the diagram: 1. Roller;

[0048] 2. Movable clamping part; 21. Movable clamping arm; 211. First rotating movable clamping arm; 212. Second rotating movable clamping arm;

[0049] 3. Base; 31. Rotating support component;

[0050] 4. Connecting plate;

[0051] 5. Sliding part; 51. Slide rail; 52. Slider;

[0052] 6. Telescopic pushing part; 61. Telescopic rod; 62. Pushing component;

[0053] 7. Support rod;

[0054] 8. Connecting rod;

[0055] 9. Threaded hole. Detailed Implementation

[0056] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0058] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0059] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0060] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0061] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0062] To address the current technical problems of low efficiency, poor adaptability, and poor positioning accuracy caused by the main manual handling and traditional robotic arm handling of U-tubes, such as... Figure 1-4 As shown, Embodiment 1 of the present invention provides a material receiving and positioning fixture, comprising:

[0063] Connecting plate 4;

[0064] Base 3 is symmetrically located at the bottom of connecting plate 4;

[0065] The sliding part 5 is symmetrically arranged on both sides of the center position of the connecting line of the base 3, and is fixedly installed at the bottom of the connecting plate 4;

[0066] The telescopic pushing part 6 is located at one end opposite to the sliding part 5;

[0067] The movable clamping part 2 is symmetrically arranged on both sides of the center position of the connecting line of the sliding part 5. The movable clamping part 2 includes a pair of movable clamping arms 21 arranged in a cross manner. The top of the movable clamping arm 21 is rotatably connected to the telescopic pushing part 6 on the same side. The middle positions of the movable clamping arms 21 on both sides of the connecting line of the base 3 are connected by a connecting rod 8.

[0068] The support rod 7 has one end located in the middle of the telescopic push part 6 and the other end rotatably connected to the middle of the connecting rod 8. The support rod 7 is used to support the contraction and expansion of the second rotating movable clamping arm 212.

[0069] Rollers 1 are located at the middle and bottom of the movable clamping arm 21 and are used to clamp the U-tube.

[0070] This invention drives the telescopic pusher through the sliding part, which in turn drives the movable clamping part to move. The sliding parts on both sides control the movement of the movable clamping parts on both sides respectively, which can achieve material receiving and positioning at any angle.

[0071] The clamp contact body of the present invention adopts a roller design, which changes the surface contact to line contact compared with manual handling and traditional robotic arm handling, reducing the contact area and reducing damage and scratches to the surface of the U-tube.

[0072] This invention uses a sliding part to drive a telescopic pushing part, which in turn causes the opening of the movable clamping arm to enlarge or shrink. The telescopic pushing part drives a connecting rod via a support rod, further enlarging or shrinking the opening at the bottom of the movable clamping arm. Furthermore, by controlling the displacement of the slider in the sliding part, the maximum opening size can be changed. Therefore, it can adapt to copper tubes of different specifications and shapes, reducing the frequency of clamp changes and improving positioning accuracy. It supports adaptive adjustment of tube diameter ф5-15mm and fin spacing 3-20mm.

[0073] This invention has a simple structure, is easy to maintain and replace, extends service life, and reduces production costs.

[0074] Preferably, but not limitingly, the base 3 is a telescopic component, and a rotating support 31 is fixedly provided at the bottom of the base 3.

[0075] This invention, through the design of a retractable base, can not only support the movable clamping part, but also extend and retract to a certain extent, in order to compensate for the movement distance of the top of the movable clamping part when it contracts and expands, thus avoiding jamming.

[0076] Preferably, but not limitingly, the pair of movable clamping arms 21 are rotatably mounted on the rotating support 31 in an intersecting position.

[0077] Preferably, but not limitingly, the movable clamping arm 21 includes: a first rotating movable clamping arm 211 and a second rotating movable clamping arm 212.

[0078] A pair of first rotating movable clamping arms 211 are arranged crosswise, and the top of the first rotating movable clamping arm 211 is rotatably connected to the telescopic pushing part 6;

[0079] The bottom of the first rotating movable clamping arm 211 is rotatably connected to the second rotating movable clamping arm 212.

[0080] The first rotating movable clamping arm 211 and the second rotating movable clamping arm 212 on the same side are connected by a connecting rod 8.

[0081] The present invention can ensure high-precision positioning during the U-tube clamping and receiving process by setting a first rotating movable clamping arm and a second rotating movable clamping arm.

[0082] Preferably, but not limitingly, the inner sides of the first rotary movable clamping arm 211 and the second rotary movable clamping arm 212 are arc-shaped.

[0083] The curvature of the arc of the first rotating movable clamping arm 211 is greater than that of the arc of the second rotating movable clamping arm 212.

[0084] The present invention uses the inner sides of the first rotating movable clamping arm 211 and the second rotating movable clamping arm 212 to be arc-shaped, which can well fit the circular outer surface of the U tube and avoid scratching or abrasion to the U tube.

[0085] Preferably, but not limitingly, the sliding part 5 includes: a slide rail 51 and a slider 52;

[0086] The slide rail 51 is fixed to the bottom of the connecting plate 4, and the slider 52 is disposed on the slide rail 51.

[0087] The telescopic pusher 6 is located on the slider 52.

[0088] The slide rail of this invention is an I-shaped slide rail, which allows the slider to tightly hold the slide rail and prevents it from derailing.

[0089] Preferably, but not limitingly, the telescopic pushing part 6 includes: a telescopic rod 61 and a pushing member 62;

[0090] One end of the telescopic rod 61 is provided on the sliding part 5, and the other end is provided with a pusher 62 parallel to the connecting line of the base 3;

[0091] The two ends of the pusher 62 are rotatably connected to the top of the movable clamping arm 21.

[0092] Preferably, but not limitingly, the support rod 7 is connected to the middle of the pusher 62.

[0093] By providing a telescopic rod 61, this invention can prevent the top of the movable clamping part 2 from getting stuck during movement, thus compensating for the movement path of the movable clamping part 2 and ensuring the normal operation of the material receiving and positioning fixture.

[0094] Preferably, but not limitingly, a roller 1 is provided at the connection between the first rotary movable clamping arm 211 and the second rotary movable clamping arm 212.

[0095] The bottom of the second rotating movable clamping arm 212 is also provided with rollers 1.

[0096] Preferably, but not limitingly, the present invention is designed such that the roller 1 and the movable clamping part 2 fit together tightly.

[0097] However, because the materials of the roller and the movable clamping part are neither exceptionally smooth nor exceptionally rough, there will be a slight relative positional shift between them during operation. This means the roller will slightly roll around its axis, taking into account that the U-tube material being clamped is cylindrical. If the gap between the roller and the movable clamping part is large, or if the material surfaces of the roller and the movable clamping part are exceptionally smooth, the roller will roll easily. When the U-tube diameter is large, slippage can easily occur, meaning the U-tube will disengage from the receiving and positioning fixture, thus affecting work efficiency. If the material surfaces of the roller and the movable clamping part are exceptionally rough, the roller will have difficulty rotating relative to the material. In this case, if there are foreign objects on the roller surface, they can easily scratch the U-tube, leading to product quality problems.

[0098] In this embodiment, a total of 8 rollers 1 are provided to directly contact the U-tube, which makes the clamping process more secure.

[0099] Preferably, but not limitingly, roller 1 is cylindrical. Compared with traditional gripper-type positioning fixtures, the cylindrical design reduces the contact area during gripping, resulting in more uniform force distribution. The contact pressure is ≤0.1MPa, ensuring uniform force distribution and zero surface damage.

[0100] Preferably, but not limitingly, the top of the connecting plate 4 is disposed on the robotic hand or robotic arm.

[0101] Further preferred but not limiting, the connecting plate 4 is provided with threaded holes 9 at its four corners, and the threaded connectors fix the connecting plate 4 to the robotic arm or robotic hand through the threaded holes 9.

[0102] The threaded hole design of this invention embodies a modular design, enabling quick disassembly and installation on a new robotic arm or hand when it needs to be replaced for some reason.

[0103] Preferably, but not limitingly, the receiving and positioning fixture has a built-in controller, which is electrically connected to the drive slider 52 to control the sliding of the drive slider 52. The robotic arm or robotic hand controls the sliding of the drive slider 52 through the controller, thereby realizing the gripping and returning.

[0104] Preferably, but not limitingly, the roller 1 may be made of a flexible material, such as rubber, silicone, etc.

[0105] Preferably, but not limitingly, the movable clamping part 2 may be made of a flexible material, such as rubber, silicone, etc.

[0106] In other embodiments, the movable clamping part 2 may be made of a high-strength material, such as stainless steel, carbon fiber composite material, etc., to ensure rigidity requirements.

[0107] Embodiment 2 of the present invention provides a method for using a material receiving and positioning fixture, comprising the following steps:

[0108] Step S210: The receiving and positioning fixture is installed on the robotic arm or robotic hand, and electrically connected to the slider 52 of the sliding part 5 through the robotic arm or robotic hand to drive the movement of the slider 52.

[0109] In step S220, during clamping, the drive slider 52 drives the telescopic push part 6 to retract inward, making the opening below the connection position of the movable clamping arm 21 larger. The telescopic push part 6 drives the support rod 7 to rotate, which in turn drives the connecting rod 8 to move, making the opening of the second rotating movable clamping arm 212 of the movable clamping arm 21 even larger.

[0110] In step S230, the robotic arm or robotic hand moves the receiving and positioning fixture to the position of the U-tube. After the roller 1 in the middle of the movable clamping arm 21 contacts the U-tube, the drive slider 52 drives the telescopic push part 6 to move outward, so that the opening below the connection position of the movable clamping arm 21 becomes smaller. The telescopic push part 6 drives the support rod 7 to rotate, which in turn drives the connecting rod 8 to move, so that the opening of the second rotating movable clamping arm 212 of the movable clamping arm 21 becomes smaller, thereby clamping the U-tube.

[0111] In step S240, after the U-tube is moved to the designated position, the drive slider 52 drives the telescopic push part 6 to retract inward, making the opening below the connection position of the movable clamping arm 21 larger. The telescopic push part 6 drives the support rod 7 to rotate, which in turn drives the connecting rod 8 to move, making the opening of the second rotating movable clamping arm 212 of the movable clamping arm 21 further larger, and the U-tube is put down, completing one clamping and putting-back operation.

[0112] Preferably, but not limitingly, the displacement of the drive slider 52 during a single clamping and retraction is positively correlated with the diameter of the U-tube.

[0113] Preferably, but not limitingly, the drive sliders 52 on both sides can be controlled independently, thereby making the range of motion of the movable clamping arms 21 on different sides different.

[0114] Preferably, but not limitingly, if the U-tube is long, several identical receiving and positioning clamps can be arranged along a straight line to clamp it, so as to avoid the instability of the clamping process caused by concentrated force.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A material receiving positioning fixture, characterized by, Include: The connecting plate (4); The base (3) is symmetrically provided at the bottom of the connecting plate (4), and the base (3) is a telescopic part; The sliding part (5) is symmetrically provided at both sides of the center position of the connecting line of the base (3), and is fixedly provided at the bottom of the connecting plate (4); The telescopic pushing part (6) is provided at one end of the sliding part (5) facing each other; The movable clamping part (2) is symmetrically provided at both sides of the center position of the connecting line of the sliding part (5), and the movable clamping part (2) includes a pair of cross-arranged movable clamping arms (21), the top of the movable clamping arm (21) is rotatably connected with the telescopic pushing part (6) on the same side thereof; the middle positions of the movable clamping arms (21) on both sides of the connecting line of the base (3) are connected by a connecting rod (8); The supporting rod (7) is provided at the middle of the telescopic pushing part (6) at one end, and the other end is rotatably connected to the middle of the connecting rod (8); The roller (1) is provided at the middle and bottom of the movable clamping arm (21) for clamping the U tube.

2. The material receiving and positioning clamp according to claim 1, wherein: A rotating support (31) is fixedly provided at the bottom of the base (3).

3. The material receiving and positioning clamp according to claim 2, wherein: A pair of cross-arranged movable clamping arms (21) are rotatably arranged on the rotating support (31).

4. The material receiving and positioning clamp according to claim 1, wherein: The movable clamping arm (21) includes a first rotatable movable clamping arm (211) and a second rotatable movable clamping arm (212); A pair of first rotatable movable clamping arms (211) are cross-arranged, and the top of the first rotatable movable clamping arm (211) is rotatably connected with the telescopic pushing part (6); The bottom of the first rotatable movable clamping arm (211) is rotatably connected with the second rotatable movable clamping arm (212); The connecting positions of the first rotatable movable clamping arm (211) and the second rotatable movable clamping arm (212) are connected by the connecting rod (8).

5. The material receiving and positioning clamp according to claim 4, wherein: The inner sides of the first rotatable movable clamping arm (211) and the second rotatable movable clamping arm (212) are arranged in arc shape; The curvature of the arc shape of the first rotatable movable clamping arm (211) is greater than that of the second rotatable movable clamping arm (212).

6. The material receiving and positioning clamp according to claim 4, wherein: The connecting positions of the first rotatable movable clamping arm (211) and the second rotatable movable clamping arm (212) are provided with the roller (1); The bottom of the second rotatable movable clamping arm (212) is also provided with the roller (1).

7. The material receiving and positioning clamp according to claim 1, wherein: The sliding part (5) includes a sliding rail (51) and a sliding block (52); The sliding rail (51) is fixedly provided at the bottom of the connecting plate (4), and the sliding block (52) is provided on the sliding rail (51); The telescopic pushing part (6) is provided on the sliding block (52).

8. The material receiving and positioning clamp according to claim 1, wherein: the telescopic pushing part (6) comprises a telescopic rod (61) and a pushing piece (62); one end of the telescopic rod (61) is arranged on the sliding part (5), and the other end is provided with the pushing piece (62) parallel to the connecting line of the base (3); both ends of the pushing piece (62) are rotatably connected to the top of the movable clamping arm (21).

9. The material receiving and positioning clamp according to claim 2, wherein: the top of the connecting plate (4) is arranged on a manipulator or a mechanical arm.

10. A method of using a material positioning fixture according to any one of claims 1-9, characterized in that, comprising the following steps: installing the material receiving and positioning clamp on the manipulator or the mechanical arm, and electrically connecting the sliding block (52) of the sliding part (5) through the manipulator or the mechanical arm to drive the movement of the sliding block (52); when clamping, the sliding block (52) drives the telescopic pushing part (6) to contract inward, so that the opening of the part below the connection position of the movable clamping arm (21) becomes larger, the telescopic pushing part (6) drives the supporting rod (7) to rotate, and then drives the connecting rod (8) to move, so that the opening of the second rotating movable clamping arm (212) of the movable clamping arm (21) becomes larger; the manipulator or the mechanical arm moves the material receiving and positioning clamp to the position of the U tube, after the roller (1) in the middle of the movable clamping arm (21) contacts the U tube, the sliding block (52) drives the telescopic pushing part (6) to move outward, so that the opening of the part below the connection position of the movable clamping arm (21) becomes smaller, the telescopic pushing part (6) drives the supporting rod (7) to rotate, and then drives the connecting rod (8) to move, so that the opening of the second rotating movable clamping arm (212) of the movable clamping arm (21) becomes smaller, thereby clamping the U tube; after moving the U tube to the designated position, the sliding block (52) drives the telescopic pushing part (6) to contract inward, so that the opening of the part below the connection position of the movable clamping arm (21) becomes larger, the telescopic pushing part (6) drives the supporting rod (7) to rotate, and then drives the connecting rod (8) to move, so that the opening of the second rotating movable clamping arm (212) of the movable clamping arm (21) becomes larger, and the U tube is lowered, completing one clamping and returning.

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