A chuck jig for square tubes

Abstract

The application discloses a chuck jig for square pipes, which comprises a jig body, a center suction port is formed in the jig body, an air inlet is arranged on one side of the jig body, and the center suction port and the air inlet are connected through a pipeline; four positioning pins are slidably connected to the jig body, the four positioning pins are symmetrically arranged on the two sides of the center suction port, and a driving mechanism for driving the four positioning pins to simultaneously approach or move away from the center suction port is arranged on the jig body; the driving mechanism comprises two rotating rods, the two rotating rods are hinged, the four positioning pins are arranged at the two ends of the two rotating rods, and the distances from the four positioning pins to the hinge shafts of the two rotating rods are equal. Through rotation of the rotating rods, the positions of the four positioning pins can be changed, the spacing between the positioning pins on the two sides of the center suction port is changed, and the effect that the chuck jig is suitable for positioning various square pipes is achieved.

Description

Technical Field

[0001] This invention relates to the field of jig technology, specifically a suction cup jig for square tubes. Background Technology

[0002] In machine tool processing, automated manufacturing, and robotic arms, vacuum suction cups are commonly used to hold products in place for easier processing. Traditionally, a vacuum pump or vacuum suction gun is used to apply pressure to the suction cups, requiring manual operation to hold the product in place. This method is time-consuming, labor-intensive, and inefficient.

[0003] In the prior art, patent application number CN202311075721.4 discloses a concealed suction cup fixture and its application method, which relies on a triangle formed by a workpiece positioning post, a positioning auxiliary cone, and a suction cup to ensure the accuracy of the workpiece position and can automatically position it. However, it requires positioning holes to be made on the workpiece for positioning, which is not suitable for some special-purpose workpieces that cannot be drilled.

[0004] Patent application number CN201310162164.X discloses a vacuum suction cup positioning fixture that can quickly position products. Although setting threaded countersunk holes and non-threaded countersunk holes can accommodate vacuum suction cups of different sizes, it can only be used for products of the sizes corresponding to the threaded and non-threaded countersunk holes, and its practicality is not high. Summary of the Invention

[0005] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide a suction cup fixture for square tubes, which has high practicality and can be applied to the positioning of various square tubes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A suction cup fixture for square tubes includes a fixture body, a central suction port on the fixture body, an air inlet on one side of the fixture body, and the central suction port and the air inlet are connected by a pipe. The fixture body is slidably connected with four positioning pins, which are symmetrically located on both sides of the central suction port. The fixture body is provided with a driving mechanism for driving the four positioning pins to move closer to / away from the central suction port at the same time. The drive mechanism includes two rotating rods that are hinged together. Four positioning pins are respectively disposed at both ends of the two rotating rods, and the distances from the four positioning pins to the hinge axis of the two rotating rods are equal.

[0007] Compared with the prior art, the beneficial effects of the present invention are: By rotating the lever, the positions of the four positioning pins can be changed, thereby altering the spacing between the positioning pins on both sides of the central suction port, achieving an effect suitable for positioning various square tubes. Furthermore, the four positioning pins move simultaneously towards / away from the central suction port, ensuring that the center of the square tube is always located on the central suction port, preventing the central suction port from communicating with the outside world, thus improving the suction effect of the central suction port.

[0008] Preferably, a base plate is fixedly provided at the bottom of the fixture body, the rotating rod is rotatably connected to the base plate, and the driving mechanism further includes a push plate slidably connected to the base plate and a screw threadedly connected to the push plate for pushing the push plate to slide. The push plate is located on one side of the central suction port, and the push plate slides along the direction of the hinge axis close to / away from the two rotating rods.

[0009] Preferably, the base plate has an opening on one side, and an end cap is provided on the opening.

[0010] Preferably, the end cap is rotatably connected to a knob, and the screw is fixed to the knob.

[0011] Preferably, a limiting rod is fixed on the end cap, the limiting rod is parallel to the screw, and the push plate is slidably connected to the limiting rod.

[0012] Preferably, a sliding rod is fixed to the bottom of the positioning pin, and the sliding rod is fixed to the rotating rod.

[0013] Preferably, the fixture body has four waist-shaped grooves, which are symmetrically located on both sides of the central suction port. The waist-shaped grooves are vertically connected, and the four sliding rods are located in the four waist-shaped grooves respectively.

[0014] Preferably, the fixture body has two side suction ports, which are located on both sides of the central suction port.

[0015] Preferably, each end of the side adsorption port is provided with a flexible tube for connecting the side adsorption port and the pipe, and a part of the flexible tube is located in the waist-shaped groove; when the four positioning pins approach each other, the slide rod and the inner wall of the waist-shaped groove flatten the flexible tube.

[0016] Preferably, the pipe includes a long pipe and two short pipes. The long pipe is connected to the air inlet, and the two short pipes are respectively connected to both ends of the long pipe. The two short pipes are respectively located on both ends of the fixture body, and the waist-shaped groove is located between the side suction port and the short pipes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 2 A partial sectional view; Figure 3This is a structural schematic diagram from another perspective of the present invention; Figure 4 for Figure 3 A partial sectional view; Figure 5 for Figure 4 Enlarged view of section “A”; In the picture: 1. Fixture body; 101. Central suction port; 102. Side suction port; 11. Air inlet; 111. Pipe; 12. Waist-shaped groove; 13. Hose; 2. Base plate; 3. Positioning pin; 31. Slide rod; 4. Drive mechanism; 41. End cap; 42. Knob; 43. Screw; 44. Limiting rod; 45. Push plate; 46. Rotating rod. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1 This embodiment provides a suction cup fixture for square tubes, which is suitable for square tubes with a rectangular bottom surface. It includes a fixture body 1, the upper surface of which is rectangular. The two sides in the length direction of the fixture body 1 are defined as ends, and the two sides in the width direction of the fixture body 1 are defined as sides.

[0020] Please see Figure 1 and Figure 2 In this embodiment, the fixture body 1 has a central adsorption port 101 and two side adsorption ports 102 along its length (the extension directions of the central adsorption port 101 and the two side adsorption ports 102 are parallel), and the two side adsorption ports 102 are located on both sides of the central adsorption port 101. An air inlet 11 is provided on one side of the fixture body 1, and a pipe 111 is provided inside the fixture body 1. The pipe 111 includes a long pipe and two short pipes. The long pipe is arranged along the length direction of the fixture body 1, and the short pipes are arranged along the width direction of the fixture body 1. The air inlet 11 is arranged on the long pipe, and the inner end of the air inlet 11 is connected to the long pipe. The outer end of the air inlet 11 is connected to a high-pressure air pump. The two short pipes are respectively connected to the two ends of the long pipe, and the two short pipes are respectively located on the two ends of the fixture body 1. The two ends of the central adsorption port 101 are respectively connected to the short pipes, and the two ends of the side adsorption ports 102 are respectively provided with a flexible hose 13 for connecting the side adsorption ports 102 and the pipe 111.

[0021] In this embodiment, the fixture body 1 has four waist-shaped grooves 12. The four waist-shaped grooves 12 are symmetrically located on both sides of the central suction port 101 and at both ends of the side suction ports 102. The waist-shaped grooves 12 are vertically connected. A sliding rod 31 is slidably connected inside the waist-shaped groove 12. A positioning pin 3 is fixed at the top of the sliding rod 31. The bottom of the positioning pin 3 is slidably connected to the upper surface of the fixture body 1 (this structure naturally forms four positioning pins 3 symmetrically located on both sides of the central suction port 101 and at both ends of the two side suction ports 102).

[0022] It is worth noting that the waist-shaped groove 12 is located between the side suction port 102 and the short tube. When the width of the square tube to be positioned is less than the distance between the two side suction ports 102, the positioning pin 3 and the sliding rod 31 move towards the side closer to the central suction port 101. The sliding rod 31 and the side wall of the waist-shaped groove 12 flatten the hose 13, preventing gas from passing through the hose 13. At this time, when the high-pressure suction pump is turned on, the two side suction ports 102 will not generate negative pressure, preventing dust from being sucked into the side suction ports 102. When the width of the square tube to be positioned is greater than the distance between the two side suction ports 102, the positioning pin 3 and the sliding rod 31 move away from the central suction port 101. Under the action of its own elasticity, the hose 13 returns to the open state. At this time, the suction force of the high-pressure suction pump is turned on and increased, allowing gas to pass through the hose 13. The two side suction ports 102 and the central suction port 101 generate negative pressure at the same time (the central suction port 101 is always in a negative pressure state after the high-pressure suction pump is turned on).

[0023] To ensure more precise positioning of the four locating pins 3, i.e., to ensure that the distances from the four locating pins 3 to the central suction port 101 are equal, please refer to [link / reference needed]. Figure 3 , Figure 4 and Figure 5 In this embodiment, a base plate 2 is fixedly provided at the bottom of the fixture body 1. The base plate 2 is provided with a driving mechanism 4 for driving four positioning pins 3 to simultaneously approach / move away from the central suction port 101. The driving mechanism 4 includes two rotating rods 46, a push plate 45 slidably connected to the base plate 2, and a screw 43 threadedly connected to the push plate 45 for pushing the push plate 45 to slide. Two rotating rods 46 are hinged together, and the hinge axis of both rotating rods 46 is located at the center of the two rotating rods 46. The hinge axis is located directly below the central suction port 101, and the distance from the hinge axis to both ends of the central suction port 101 is equal. The hinge axis is set on the base plate 2, so that the two rotating rods 46 are rotatably connected to the base plate 2. The bottom ends of four sliding rods 31 are respectively fixed to the two ends of the two rotating rods 46, that is, one sliding rod 31 is set at each end of one rotating rod 46, and the distance from the sliding rod 31 to the hinge axis is equal. The push plate 45 is located on one side of the central suction port 101 (the push plate 45 is set on the center line of the length direction of the central suction port 101). The push plate 45 slides along the direction close to / away from the hinge axis of the two rotating rods 46, that is, the push plate 45 slides along the width direction of the fixture body 1. The side of the push plate 45 close to the two rotating rods 46 is parallel to the extension direction of the central suction port 101. When the square tube is located on the fixture body 1, the push plate 45 moves towards the central suction port 101. The push plate 45 simultaneously contacts the two rotating rods 46, pushing the two rotating rods 46 to rotate until the positioning pin 3 abuts against the square tube. At this time, the push plate 45 abuts against the two rotating rods 46. (The push plate 45 and the two rotating rods 46 are in line contact. The distances from the two lines to the hinge axis are equal, and they are located at the two ends of the hinge axis respectively.) The base plate 2 has an opening on one side, which is located on the same side as the push plate 45. An end cover 41 is provided on the opening, and a knob 42 is rotatably connected to the end cover 41. The screw 43 is fixed on the knob 42. A limiting rod 44 is fixed on the end cover 41. The limiting rod 44 is parallel to the screw 43, and the push plate 45 is slidably connected to the limiting rod 44.

[0024] During positioning, the square tube is first placed on the fixture body 1, with four positioning pins 3 located on both sides of the square tube. Rotating the knob 42 causes the screw 43 to rotate, which in turn causes the push plate 45 to slide towards the side closer to the central suction port 101. The push plate 45 then pushes two rotating rods 46 to rotate, causing all four positioning pins 3 to slide simultaneously towards the side closer to the central suction port 101 until all four positioning pins 3 simultaneously abut against the side of the square tube, completing the positioning of the square tube. During this process, the four positioning pins 3 can also adjust the angle of the square tube, ensuring that the extension direction of the square tube is parallel to the length direction of the fixture body 1.

[0025] During adsorption and fixation, turn on the high-pressure air pump. If the square tube is wide enough to cover the two side adsorption ports 102, increase the suction pressure. The two side adsorption ports 102 and the central adsorption port 101 will simultaneously suck up the square tube, improving the adsorption and fixation effect. If the square tube is narrow and cannot cover the two side adsorption ports 102, the sliding rod 31 and the inner wall of the waist-shaped groove 12 will flatten the hose 13. The side adsorption ports 102 will not generate negative pressure, and only the central adsorption port 101 will suck up the square tube, preventing dust from entering the fixture from the side adsorption ports 102.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A suction cup fixture for square tubes, comprising a fixture body (1), characterized in that, The fixture body (1) is provided with a central suction port (101), and an air inlet (11) is provided on one side of the fixture body (1). The central suction port (101) and the air inlet (11) are connected by a pipe (111). The fixture body (1) is slidably connected with four positioning pins (3). The four positioning pins (3) are symmetrically located on both sides of the central suction port (101). The fixture body (1) is provided with a driving mechanism (4) for driving the four positioning pins (3) to move closer to / away from the central suction port (101) at the same time. The drive mechanism (4) includes two rotating rods (46), which are hinged together. Four positioning pins (3) are respectively set at both ends of the two rotating rods (46), and the distances from the four positioning pins (3) to the hinge axis of the two rotating rods (46) are equal. The bottom of the fixture body (1) is fixedly provided with a base plate (2), the rotating rod (46) is rotatably connected to the base plate (2), the driving mechanism (4) further includes a push plate (45) slidably connected to the base plate (2), and a screw (43) threadedly connected to the push plate (45) for pushing the push plate (45) to slide. The push plate (45) is located on one side of the central suction port (101), and the push plate (45) slides along the direction of approaching / away from the hinge axis of the two rotating rods (46). The bottom of the positioning pin (3) is fixedly provided with a slide rod (31), and the slide rod (31) is fixed on the rotating rod (46); The fixture body (1) has four waist-shaped grooves (12), which are symmetrically located on both sides of the central suction port (101). The waist-shaped grooves (12) are connected vertically, and four sliding rods (31) are located in the four waist-shaped grooves (12). The fixture body (1) has two side suction ports (102), which are located on both sides of the central suction port (101). The two ends of the side adsorption port (102) are respectively provided with a flexible hose (13) for connecting the side adsorption port (102) and the pipe (111). A part of the flexible hose (13) is located in the waist-shaped groove (12). When the four positioning pins (3) approach each other, the slide rod (31) and the inner wall of the waist-shaped groove (12) flatten the flexible hose (13).

2. The suction cup fixture for square tubes according to claim 1, characterized in that, The base plate (2) has an opening on one side, and an end cap (41) is provided on the opening.

3. A suction cup fixture for square tubes according to claim 2, characterized in that, The end cap (41) is rotatably connected to a knob (42), and the screw (43) is fixed on the knob (42).

4. A suction cup fixture for square tubes according to claim 2, characterized in that, A limiting rod (44) is fixed on the end cap (41). The limiting rod (44) is parallel to the screw (43). The push plate (45) is slidably connected to the limiting rod (44).

5. A suction cup fixture for square tubes according to claim 1, characterized in that, The pipe (111) includes a long pipe and two short pipes. The long pipe is connected to the air inlet (11), and the two short pipes are connected to the two ends of the long pipe respectively. The two short pipes are located on the two ends of the fixture body (1) respectively, and the waist-shaped groove (12) is located between the side adsorption port (102) and the short pipes.

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