Suction nozzle spacing adjusting mechanism based on linear gradient lead screw

Abstract

The suction nozzle distance adjusting mechanism comprises a base frame, the linear gradual change lead screw and a guide rod are arranged on the base frame in parallel, and a spiral groove with linear gradual change lead is formed in the surface of the linear gradual change lead screw; a plurality of sliding assemblies are arranged on the linear gradient lead screw and the guide rod in a sliding mode, and the distance between every two adjacent sliding assemblies is in an arithmetic progression. The sliding assembly is provided with a transversely overhanging module fixing plate, and a suction nozzle module is installed at the tail end of the module fixing plate. The module fixing plates of the sliding assemblies are different in length, so that the distances between the adjacent suction nozzle modules are equal. A driving mechanism is mounted on the base frame and used for driving the linear gradient lead screw to rotate; when the linear gradient lead screw rotates, the spiral groove can drive the sliding assemblies to move along the linear gradient lead screw and the guide rod. In the moving process of the sliding assemblies, the distance increments of the adjacent sliding assemblies are equal. Stepless equal-distance adjustment of the distance between the suction nozzle modules can be achieved, and adaptability is good.

Description

Technical Field

[0001] The invention relates to a component taking and placing mechanism, and in particular to a nozzle spacing adjustment mechanism based on a linear gradually variable lead screw. Background Art

[0002] In the automated assembly process of many precision products, the products delivered by the front-end assembly line or vibrating plate are closely arranged end to end. However, the spacing between products at the assembly or testing stations is larger. This means that the spacing between incoming products is inconsistent with the assembly or testing spacing, making direct grasping for assembly or testing impossible. A variable-pitch gripping mechanism is required to achieve automated product assembly. Existing variable-pitch gripping mechanisms can only adjust to fixed spacing, making them suitable only for specific situations and having limited applicability. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a nozzle spacing adjustment mechanism based on a linear gradient lead screw, in which the spacing can be infinitely adjusted.

[0004] Technical solution: The present invention provides a nozzle spacing adjustment mechanism based on a linear gradient lead screw, comprising a base frame, on which a linear gradient lead screw and a guide rod are arranged in parallel, and the surface of the linear gradient lead screw has a spiral groove with a linear gradient lead; a plurality of sliding components are slidingly arranged on the linear gradient lead screw and the guide rod, and the spacing between adjacent sliding components is an arithmetic progression; the sliding component has a laterally overhanging module fixing plate, and a nozzle module is installed at the end of the module fixing plate; the module fixing plates of each sliding component have different lengths, so that the spacing between adjacent nozzle modules is equal; a driving mechanism is installed on the base frame for driving the linear gradient lead screw to rotate; when the linear gradient lead screw rotates, the spiral groove can drive each sliding component to move along the linear gradient lead screw and the guide rod; during the movement of each sliding component, the spacing increments of adjacent sliding components are equal.

[0005] Furthermore, a Cartesian three-dimensional coordinate system is established with a point on the axis of the left end of the linear gradual lead screw as the coordinate origin. The right side of the axis of the linear gradual lead screw is the positive direction of the X-axis. The parametric equation of the trajectory line of the spiral groove is:

[0006] x=L*t*t,y=r*sin(t*360*n),z=r*cos(t*360*n)

[0007] Wherein, L is the total length of the spiral groove in the direction of the screw axis; t varies from 0 to 1; r is the screw radius; and n is the number of spiral turns.

[0008] Furthermore, the spiral groove on the surface of the linear progressive lead screw is a single-line spiral groove or a double-line spiral groove.

[0009] Furthermore, each sliding component is initially located at the leftmost end of the spiral groove or the starting point of the first circle, the end of the first circle of the spiral groove or the starting point of the second circle, the end of the second circle of the spiral groove or the starting point of the third circle, the end of the third circle of the spiral groove or the starting point of the fourth circle, the end of the fourth circle of the spiral groove or the starting point of the fifth circle... and so on.

[0010] Furthermore, the sliding assembly includes a slide plate and a module fixing plate, and the slide plate and the module fixing plate form an L-shaped structure; a slip ring is fixed on the side of the slide, and the linear gradient lead screw passes through the slide plate and the slip ring, and the outer cylindrical surface of the linear gradient lead screw slides with the inner hole of the slip ring; a guide pin is fixed on the slip ring for sliding with the spiral groove.

[0011] Furthermore, a radial hole is opened on the slip ring, the outer section of the radial hole has an internal thread, the outer section of the guide pin is threadedly matched with the radial hole, and the part of the guide pin extending out of the slip ring is screwed with a locking nut to fix the radial position of the guide pin.

[0012] Furthermore, a guide sleeve is fixed to the side of the slide, and a guide rod passes through the slide and the guide sleeve, and the outer cylindrical surface of the guide rod is slidably matched with the inner hole of the guide sleeve.

[0013] Furthermore, the base frame includes a base plate, and a left shaft seat and a right shaft seat are fixed at both ends of the base plate respectively. The linear gradual lead screw is rotatably mounted on the two shaft seats through bearings; and the guide rod is fixed on the two shaft seats.

[0014] Furthermore, the driving mechanism includes a motor, a first pulley is installed at the output end of the motor, a second pulley is installed at the end of the linear gradual lead screw, and the two pulleys are connected by a belt.

[0015] Furthermore, the motor is fixed on the base frame by using a motor bracket.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0017] (1) The distance between the nozzle modules can be flexibly adjusted, and has good adaptability.

[0018] The spiral groove on the linear gradual lead screw has a linear gradual lead. By controlling the forward and reverse rotation of the linear gradual lead screw, the spacing between the nozzle modules can be increased or decreased steplessly and evenly, and the adjustment movement is smooth.

[0019] (2) The overall structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the initial state of a nozzle spacing adjustment mechanism based on a linear gradient lead screw provided by an embodiment of the present invention;

[0021] Figure 2Schematic diagram of the expanded state of a nozzle module of a nozzle spacing adjustment mechanism based on a linear gradient lead screw provided by an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Exploded view of

[0023] Figure 4 1 is a schematic structural diagram of a linear gradual lead screw according to an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of adjusting the distance between sliding components by rotating a linear variable lead screw in an embodiment of the present invention;

[0025] Figure 6 2 is a schematic structural diagram of the third sliding assembly and the third nozzle module in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Attachment Figures 1 to 6 The reference numerals in the figures are as follows:

[0028] 1, base frame; 11, base plate; 12, left shaft seat; 13, right shaft seat; 14, motor bracket;

[0029] 2. Linear variable lead screw;

[0030] 3. Guide rod;

[0031] 4, sliding assembly; 41, first sliding assembly; 42, second sliding assembly; 43, third sliding assembly; 431, slide plate; 432, module fixing plate; 433, first through hole; 434, slip ring; 435, guide pin; 436, locking nut; 437, guide sleeve; 44, fourth sliding assembly; 45, fifth sliding assembly;

[0032] 5, nozzle module; 51, first nozzle module; 52, second nozzle module; 53, third nozzle module; 531, base; 532, air pipe connector; 533, nozzle; 54, fourth nozzle module; 55, fifth nozzle module;

[0033] 6, driving mechanism; 61, motor; 62, first pulley; 63, belt; 64, second pulley.

[0034] like Figures 1 to 3As shown, an embodiment of the present invention provides a nozzle spacing adjustment mechanism based on a linear gradient lead screw, comprising a base frame 1, a linear gradient lead screw 2, a guide rod 3, a sliding assembly 4, a nozzle module 5, and a drive mechanism 6. In this embodiment, there are five sliding assemblies 4, namely a first sliding assembly 41, a second sliding assembly 42, a third sliding assembly 43, a fourth sliding assembly 44, and a fifth sliding assembly 45. There are also five nozzle modules 5, namely a first nozzle module 51, a second nozzle module 52, a third nozzle module 53, a fourth nozzle module 54, and a fifth nozzle module 55.

[0035] The base frame 1 includes a base plate 11, a left axle seat 12, and a right axle seat 13. The base plate 11 is elongated, with the left axle seat 12 and the right axle seat 13 fixed to either end of the base plate 11. The linear variable lead screw 2 is rotatably mounted on the two axle seats via bearings, and the guide rod 3 is fixed to the two axle seats. The linear variable lead screw 2 and the guide rod 3 remain parallel and are located below the base plate 11.

[0036] like Figure 4 As shown, the surface of the linear variable-lead screw 2 has a linear variable-lead helical groove. The helical groove can be a single-strand or double-strand helical groove. The double-strand helical groove shown in the illustration consists of two single-strand helical grooves. One single-strand helical groove is rotated 180° around the axis of the linear variable-lead screw 2 and then overlaps with the other single-strand helical groove. Compared to a single-strand helical groove, the double-strand helical groove provides a more balanced driving force on the sliding assembly 4. The following description uses the single-strand helical groove as an example.

[0037] A Cartesian three-dimensional coordinate system is established with a point on the axis of the linear gradual lead screw 2 (theoretically, it can be any point on the axis) as the coordinate origin. The right side of the axis of the linear gradual lead screw 2 is the positive direction of the X axis. The parametric equation of the trajectory of the spiral groove is:

[0038] x=L*t*t,y=r*sin(t*360*n),z=r*cos(t*360*n)

[0039] Wherein, L is the total length of the spiral groove in the direction of the screw axis; t varies from 0 to 1; r is the screw radius; and n is the number of spiral turns.

[0040] When setting the specific parameters of the trajectory parameter equation, it is necessary to control the maximum helix angle to avoid self-locking due to excessive helix angle. In this embodiment, r = 20mm, L = 500mm, and n = 5 are set, and the trajectory parameter equation of the spiral groove is:

[0041] x=500*t*t,y=20*sin(t*360*5),z=20*cos(t*360*5)

[0042] Of the five spirals, the lead of the leftmost spiral is 20 mm, the lead of the second spiral is 60 mm, the lead of the third spiral is 100 mm, the lead of the fourth spiral is 140 mm, and the lead of the fifth spiral is 180 mm. The lead of each spiral increases linearly, and the lead increments of adjacent spirals are equal, all 40 mm. In other words, the trajectory formed by the above trajectory parametric equation is a spiral with a linearly gradual (increasing) lead. From left to right, the lead increases linearly (steplessly), forming an arithmetic progression.

[0043] The five sliding components 4 are slidably arranged on the linear gradual lead screw 2 and the guide rod 3, and the distances between adjacent sliding components 4 are in an arithmetic progression. Figure 5 In this embodiment, the initial positions of the sliding components 4 are set as follows:

[0044] The initial position of the first sliding assembly 41 is at the leftmost end of the spiral groove or the starting point A1 of the first circle;

[0045] The initial position of the second sliding assembly 42 is at the end of the first circle of the spiral groove or the starting point B1 of the second circle;

[0046] The initial position of the third sliding assembly 43 is located at the end of the second circle of the spiral groove or the starting point C1 of the third circle;

[0047] The initial position of the fourth sliding assembly 44 is at the end of the third circle of the spiral groove or the starting point D1 of the fourth circle;

[0048] The initial position of the fifth sliding assembly 45 is located at the end of the fourth circle of the spiral groove or the starting point E1 of the fifth circle.

[0049] The distances between adjacent sliding components 4 are 20 mm, 60 mm, 100 mm and 140 mm respectively, which are an arithmetic progression.

[0050] The structures of the sliding assemblies 4 are essentially identical, differing only in the length of their laterally overhanging module fixing plates. The module fixing plate of the first sliding assembly 41 is the shortest, while the module fixing plate of the fifth sliding assembly 45 is the longest. The module fixing plate lengths of the remaining sliding assemblies 4 vary in sequence. The following describes the structure of the sliding assemblies 4 using the third sliding assembly 43 as an example.

[0051] like Figure 6As shown, the third sliding assembly 43 includes a slide 431, a module fixing plate 432, and a guide pin 435. The slide 431 and the module fixing plate 432 form an L-shaped structure. The slide 431 is provided with a first through-hole 433 for the linear variable lead screw 2 to pass through, and a second through-hole for the guide rod 3 to pass through. A slip ring 434 and a guide sleeve 437 are fixed to the side of the slide 431, wherein the slip ring 434 is coaxial with the first through-hole 433, and the guide sleeve 437 is coaxial with the second through-hole. The linear variable lead screw 2 passes through the slide 431 and the slip ring 434, and the outer cylindrical surface of the linear variable lead screw 2 slides with the inner hole of the slip ring 434. The guide rod 3 passes through the slide 431 and the guide sleeve 437, and the outer cylindrical surface of the guide rod 3 slides with the inner hole of the guide sleeve 437.

[0052] Slip ring 434 defines a radial hole with an internally threaded outer portion. The outer portion of guide pin 435 is threadedly engaged with the radial hole. A lock nut 436 is screwed onto the portion of guide pin 435 extending from slip ring 434 to secure the radial position of guide pin 435. The inner end of guide pin 435 slidably engages with the spiral groove. When the spiral groove on the surface of linear progressive lead screw 2 is a single-strand spiral groove, there is one guide pin 435. When the spiral groove on the surface of linear progressive lead screw 2 is a double-strand spiral groove, there are two guide pins 435, each of which slidably engages with the two single-strand spiral grooves.

[0053] The driving mechanism 6 includes a motor 61 , which is fixed to the top of the base plate 11 by a motor bracket 14 . A first pulley 62 is installed at the output end of the motor 61 , and a second pulley 64 is installed at the end of the linear gradual lead screw 2 . The two pulleys are connected by a belt 63 .

[0054] A nozzle module 5 is mounted on the end of the module fixing plate of each sliding assembly 4. Specifically, a first nozzle module 51 is mounted on the end of the module fixing plate of the first sliding assembly 41, a second nozzle module 52 is mounted on the end of the module fixing plate of the second sliding assembly 42, a third nozzle module 53 is mounted on the end of the module fixing plate of the third sliding assembly 43, a fourth nozzle module 54 is mounted on the end of the module fixing plate of the fourth sliding assembly 44, and a fifth nozzle module 55 is mounted on the end of the module fixing plate of the fifth sliding assembly 45.

[0055] The nozzle module 5 includes a base 531, an air pipe joint 532 and a nozzle 533. The base 531 is fixed to the module fixing plate by screws. A vertical through hole is provided in the base 531. The nozzle 533 is threadedly connected to the lower end of the through hole, and the air pipe joint 532 is threadedly connected to the upper end of the through hole.

[0056] Combine Figure 1 and Figure 5In the initial position, the distances between adjacent sliding components 4 are 20mm, 60mm, 100mm, and 140mm respectively. However, the lengths of the module fixing plates of each sliding component 4 are different, so that each nozzle module 5 is basically close together, and the distances between adjacent nozzle modules 5 are equal and the value is small. In this embodiment, the initial distance between adjacent nozzle modules 5 is 20mm. Figure 1 shown.

[0057] 1) The linear variable lead screw 2 rotates 90° in the positive direction, and each sliding component 4 moves to the right under the drive of the spiral groove:

[0058] The first sliding assembly 41 moves 1.25 mm to the right and reaches position A2;

[0059] The second sliding assembly 42 moves rightward by 11.25 mm to reach position B2;

[0060] The third sliding assembly 43 moves 21.25 mm to the right and reaches position C2;

[0061] The fourth sliding assembly 44 moves 31.25 mm to the right and reaches position D2;

[0062] The fifth sliding assembly 45 moves 41.25 mm to the right and reaches position E2;

[0063] The increment of the distance between adjacent sliding components 4 is 10 mm, and the distances between adjacent sliding components 4 are 30 mm, 70 mm, 110 mm, and 150 mm respectively. At this time, the distance between adjacent nozzle modules 5 is 20+10=30 mm.

[0064] 2) The linear variable lead screw 2 rotates 180° in the positive direction, and each sliding component 4 moves to the right under the drive of the spiral groove:

[0065] The first sliding assembly 41 moves 5 mm to the right and reaches position A3;

[0066] The second sliding assembly 42 moves 25 mm to the right to reach position B3;

[0067] The third sliding assembly 43 moves 45 mm to the right to reach position C3;

[0068] The fourth sliding assembly 44 moves 65 mm to the right to reach position D3;

[0069] The fifth sliding assembly 45 moves 85 mm to the right to reach position E3;

[0070] The increment of the distance between adjacent sliding components 4 is 20 mm, and the distances between adjacent sliding components 4 are 40 mm, 80 mm, 120 mm, and 160 mm respectively; at this time, the distance between adjacent nozzle modules 5 is 20+20=40 mm.

[0071] 3) The linear variable lead screw 2 rotates 270° in the positive direction, and each sliding component 4 moves to the right under the drive of the spiral groove:

[0072] The first sliding assembly 41 moves 11.25 mm to the right, reaching the A4 position;

[0073] The second sliding assembly 42 moves 41.25 mm to the right to reach position B4;

[0074] The third sliding assembly 43 moves 71.25 mm to the right and reaches position C4;

[0075] The fourth sliding assembly 44 moves 101.25 mm to the right to reach position D4;

[0076] The fifth sliding assembly 45 moves 131.25 mm to the right and reaches position E4;

[0077] The increment of the distance between adjacent sliding components 4 is 30 mm, and the distances between adjacent sliding components 4 are 50 mm, 90 mm, 130 mm, and 170 mm respectively; at this time, the distance between adjacent nozzle modules 5 is 20+30=50 mm.

[0078] 4) The linear variable lead screw 2 rotates 360° in the positive direction, and each sliding component 4 moves to the right under the drive of the spiral groove:

[0079] The first sliding assembly 41 moves 20 mm to the right to reach position A5;

[0080] The second sliding assembly 42 moves 60 mm to the right to reach position B5;

[0081] The third sliding assembly 43 moves 100 mm to the right and reaches position C5;

[0082] The fourth sliding assembly 44 moves 140 mm to the right to reach position D5;

[0083] The fifth sliding assembly 45 moves 180 mm to the right to reach position E5;

[0084] The increment of the distance between adjacent sliding components 4 is 40 mm, and the distances between adjacent sliding components 4 are 60 mm, 100 mm, 140 mm, and 180 mm respectively; at this time, the distance between adjacent nozzle modules 5 is 20+40=60 mm.

[0085] In fact, when the linear variable lead screw 2 rotates continuously from 0° to 360° under the drive of the motor 61, the distance between adjacent nozzle modules 5 increases linearly from 0 to 40 mm, and the actual distance between adjacent nozzle modules 5 increases linearly from 20 to 60 mm. When the linear variable lead screw 2 is reversed, the distance increases linearly and continuously.

Claims

1. A nozzle spacing adjustment mechanism based on a linear gradual lead screw, comprising a base frame, characterized in that: A linear gradual lead screw and a guide rod are arranged in parallel on the base frame, and a spiral groove with a linear gradual lead is provided on the surface of the linear gradual lead screw; Several sliding assemblies are slidably arranged on the linear gradual lead screw and the guide rod, and the spacing between adjacent sliding assemblies is an arithmetic progression; the sliding assembly has a laterally overhanging module fixing plate, and a nozzle module is installed at the end of the module fixing plate; the module fixing plates of each sliding assembly have different lengths so that the spacing between adjacent nozzle modules is equal; a driving mechanism is installed on the base frame for driving the linear gradual lead screw to rotate; when the linear gradual lead screw rotates, the spiral groove can drive each sliding assembly to move along the linear gradual lead screw and the guide rod; During the movement of each sliding component, the increments of the distances between adjacent sliding components are equal.

2. The nozzle spacing adjustment mechanism according to claim 1, characterized in that: A Cartesian three-dimensional coordinate system is established with a point on the axis of the left end of the linear gradual lead screw as the coordinate origin. The right side of the axis of the linear gradual lead screw is the positive direction of the X axis. The parametric equation of the trajectory line of the spiral groove is: x=L*t*t,y=r*sin(t*360*n),z=r*cos(t*360*n) Wherein, L is the total length of the spiral groove in the direction of the screw axis; t varies from 0 to 1; r is the screw radius; and n is the number of spiral turns.

3. The nozzle spacing adjustment mechanism according to claim 1, characterized in that: The spiral groove on the surface of the linear progressive lead screw is a single-line spiral groove or a double-line spiral groove.

4. The nozzle spacing adjustment mechanism according to claim 1, characterized in that: Each sliding component is initially located at the leftmost end of the spiral groove or the starting point of the first circle, the end of the first circle of the spiral groove or the starting point of the second circle, the end of the second circle of the spiral groove or the starting point of the third circle, the end of the third circle of the spiral groove or the starting point of the fourth circle, the end of the fourth circle of the spiral groove or the starting point of the fifth circle... and so on.

5. The nozzle spacing adjustment mechanism according to claim 1, characterized in that: The sliding assembly includes a slide plate and a module fixing plate, which form an L-shaped structure; a slip ring is fixed on the side of the slide, and the linear gradient lead screw passes through the slide plate and the slip ring, and the outer cylindrical surface of the linear gradient lead screw slides with the inner hole of the slip ring; a guide pin is fixed on the slip ring for sliding with the spiral groove.

6. The nozzle spacing adjustment mechanism according to claim 5, characterized in that: The slip ring is provided with a radial hole, the outer section of which has an internal thread. The outer section of the guide pin is threadedly matched with the radial hole, and the portion of the guide pin extending out of the slip ring is screwed with a locking nut to fix the radial position of the guide pin.

7. The nozzle spacing adjustment mechanism according to claim 5, characterized in that: A guide sleeve is also fixed on the side of the slide plate. The guide rod passes through the slide plate and the guide sleeve. The outer cylindrical surface of the guide rod is slidably matched with the inner hole of the guide sleeve.

8. The nozzle spacing adjustment mechanism according to claim 1, characterized in that: The base frame includes a base plate, and a left shaft seat and a right shaft seat are fixed at both ends of the base plate respectively. The linear gradual lead screw is rotatably mounted on the two shaft seats through bearings; and the guide rod is fixed on the two shaft seats.

9. The nozzle spacing adjustment mechanism according to claim 1, characterized in that: The driving mechanism includes a motor, a first pulley is installed at the output end of the motor, a second pulley is installed at the end of the linear gradual lead screw, and the two pulleys are connected by a belt.

10. The nozzle spacing adjustment mechanism according to claim 9, characterized in that: The motor is fixed on the base frame using a motor bracket.

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