A variable reach material handling device

Abstract

The present application relates to the technical field of material taking equipment, and discloses a variable-distance material taking device. The variable-distance material taking device comprises a material taking assembly, a first limiting assembly, a second limiting assembly and a pushing assembly. The material taking assembly can suck material. The first limiting step can resist one side of the material taking assembly in a first direction. The second limiting step can resist the other side of the material taking assembly in the first direction. The pushing assembly can drive the material taking assembly to move back and forth. The first pushing table can push the material taking assembly to abut against the first limiting step. The second pushing table can push the material taking assembly to abut against the second limiting step. The first limiting step and the second limiting step are arranged at different heights in the first direction. The variable-distance material taking device can accurately adjust the distance between the material taking assemblies, so that the variable-distance material taking device can take and place the bars between two material trays with different bar placement hole distances. The adjustment is convenient, and the bar taking and placing efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of material handling equipment technology, and in particular to a variable-distance material handling device. Background Technology

[0002] As the PCB (Printed Circuit Board) industry moves towards specialization and efficiency, the demand for PCB cutting tools is increasing, especially for micro drills and milling cutters. During micro drill and milling, bar stock needs to be picked up and transferred. To improve transfer efficiency, multiple picking mechanisms are typically installed on the material handling unit to pick up multiple bars at once. Because the spacing between bars on the trays at different stations varies, the spacing between the picking mechanisms needs to be adjusted to align with the tray at the next station.

[0003] Currently, the variable pitch mechanism of the material handling device has a complex structure and low variable pitch accuracy, resulting in low material handling efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a variable pitch material handling device that solves the problems of complex structure and low pitch accuracy of existing variable pitch material handling devices.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A variable-pitch material handling device, comprising:

[0007] Multiple material handling components are arranged sequentially along a first direction and are slidable along a guide shaft, and the material handling components are configured to pick up materials;

[0008] A first limiting component is provided with a plurality of first limiting steps, which can abut against one side of the material taking component along the first direction;

[0009] The second limiting component is provided with a plurality of second limiting steps, which can abut against the other side of the material taking component along the first direction;

[0010] A pushing component is configured to drive the material-taking component to reciprocate along the first direction. The pushing component is provided with a plurality of first pushing platforms and a plurality of second pushing platforms. The first pushing platforms can push the material-taking component to abut against the first limiting step, and the second pushing platforms can push the material-taking component to abut against the second limiting step. The first limiting step and the second limiting step are set to different heights in the first direction so that the material-taking component is spaced at different distances when abutting against the first limiting step and the second limiting step.

[0011] As an optional solution, the material handling component includes:

[0012] A variable pitch plate is slidably mounted on the guide shaft;

[0013] A straw, one end of which is connected to the variable-distance plate, and the other end of which is used to suck up the material;

[0014] A vacuum generator is configured to create a negative pressure inside the suction tube.

[0015] As an optional solution, the first limiting component includes a first limiting plate with a first limiting hole. The material picking component is limited within the first limiting hole. The first limiting hole has first limiting steps on both sides of the hole wall along the first direction. The guide shaft extends along the first direction and is connected to the hole wall of the first limiting hole.

[0016] As an optional solution, at least two first limiting plates are provided, with the at least two first limiting plates spaced apart.

[0017] As an optional solution, the lengths of the portions of the multiple variable pitch plates confined within the first limiting hole decrease sequentially, and pushing the variable pitch plates in the decreasing direction allows the variable pitch plates to abut against the first limiting step.

[0018] As an optional solution, the second limiting component includes a second limiting plate, the second limiting plate is provided with a second limiting hole, the variable distance plate is limited within the second limiting hole, and the second limiting step is provided on the hole wall of the second limiting hole.

[0019] As an optional solution, at least two second limiting plates are provided, with the at least two second limiting plates spaced apart.

[0020] As an optional solution, the lengths of the portions of the multiple variable pitch plates confined within the second limiting hole decrease sequentially, and the direction of decrease is opposite to the direction of decrease of the lengths of the portions confined within the first limiting hole. Pushing the variable pitch plates in the direction of decrease of the lengths of the portions of the multiple variable pitch plates confined within the second limiting hole can cause the variable pitch plates to abut against the second limiting step.

[0021] As an optional solution, the pushing component includes a pushing plate, the pushing plate is provided with a third limiting hole, the variable pitch plate is limited within the third limiting hole, and the first pushing stage and the second pushing stage are provided on the hole wall of the third limiting hole.

[0022] As an optional solution, the portion of the variable pitch plate confined within the third limiting hole is a frame, and the frames on both sides along the first direction are respectively confined within the two third limiting holes. The first pushing platform is disposed on the outer side of the frame, and the second pushing platform is disposed on the inner side of the frame.

[0023] As an optional solution, the pushing component further includes:

[0024] A first driving element is configured to drive the push plate to move along the first direction.

[0025] As an optional solution, the variable-pitch material handling device further includes:

[0026] The second driving member is configured to drive the feeding assembly to move along a second direction, which is the extension direction of the straw and is perpendicular to the first direction.

[0027] As an optional solution, the variable-pitch material handling device further includes:

[0028] The detection component is configured to detect the placement position of the material picked up by the material-taking component on the tray.

[0029] The beneficial effects of this invention are:

[0030] The variable-pitch material handling device proposed in this invention, by setting a first pushing platform and a second pushing platform, enables the pushing component to push the material handling component against the first or second limiting step when it moves left and right back and forth, thereby achieving precise adjustment of the distance between the material handling components. This allows the variable-pitch material handling device to handle bar material handling between two types of material trays with different bar material placement hole spacings, making adjustment convenient and effectively improving the bar material handling efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the variable-pitch material handling device provided by the present invention;

[0032] Figure 2 This is a partial structural schematic diagram of the variable-pitch material handling device provided by the present invention;

[0033] Figure 3 This is a schematic diagram of the material handling component of the variable-pitch material handling device provided by the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the first limiting plate and the variable distance plate provided by the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of the second limiting plate and the variable distance plate provided by the present invention;

[0036] Figure 6This is a schematic diagram of the push plate and the variable pitch plate provided by the present invention.

[0037] In the picture:

[0038] 1. Material handling assembly; 11. Gap plate; 12. Suction tube; 13. Vacuum generator; 14. Air inlet pipe; 15. Fixing plate;

[0039] 2. Guide shaft;

[0040] 3. First limiting component; 31. First limiting plate; 311. First limiting step; 312. First limiting hole;

[0041] 4. Second limiting component; 41. Second limiting plate; 411. Second limiting step; 412. Second limiting hole;

[0042] 5. Pushing component; 51. Pushing plate; 511. First pushing stage; 512. Second pushing stage; 513. Third limiting hole; 52. First driving component; 53. Connecting plate;

[0043] 6. Detection components; 61. Beam;

[0044] 7. Erecting board;

[0045] 8. First mounting bracket;

[0046] 91. Second mounting bracket; 92. Cylinder mounting plate;

[0047] 10. Second drive unit. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0052] like Figures 1-3 As shown, this embodiment provides a variable-pitch material handling device for adsorbing and transferring materials. The material used in this embodiment is described using rods such as micro drills or milling cutters as an example. It can transfer multiple rods of micro drills or milling cutters from one tray to another in a single operation. The trays are provided with rod placement holes. Normally, the rods are inserted vertically into these holes. The spacing between the rod placement holes on the two trays is different, therefore, a variable-pitch material handling device is needed to adjust the spacing between the picked-up rods.

[0053] Please see Figure 1 and Figure 2The variable-pitch material handling device provided in this embodiment includes multiple material handling components 1, a first limiting component 3, a second limiting component 4, and a pushing component 5. Multiple material-grabbing components 1 are arranged sequentially along a first direction (left-right direction) and can slide along a guide shaft 2. The material-grabbing components 1 can pick up bar stock. A first limiting component 3 is provided with multiple first limiting steps 311, which can block the material-grabbing component 1 from the right side along the first direction. A second limiting component 4 is provided with multiple second limiting steps 411, which can block the material-grabbing component 1 from the left side along the left-right direction. A pushing component 5 can drive the material-grabbing component 1 to move back and forth left and right. The pushing component 5 is provided with multiple first pushing platforms 511 and multiple second pushing platforms 512. The first pushing platforms 511 can push the material-grabbing component 1 to move to abut against the first limiting step 311, and the second pushing platforms 512 can push the material-grabbing component 1 to move to abut against the second limiting step 411. The first limiting step 311 and the second limiting step 411 are set at different heights in the left-right direction so that the material-grabbing component 1 is spaced at different distances when it abuts against the first limiting step 311 and the second limiting step 411.

[0054] The first limiting step 311 is set to a height of H1 in the first direction, and the second limiting step 411 is set to a height of H2 in the first direction. When the first pushing platform 511 pushes the picking component 1 to the right until it abuts against the first limiting step 311, the center distance between adjacent picking components 1 is H1. When the second pushing component 5 pushes the picking component 1 to the left until it abuts against the second limiting step 411, the center distance between adjacent picking components 1 is H2. By setting the first pushing platform 511 and the second pushing platform 512, the pushing component 5 can push the picking component 1 to abut against the first limiting step 311 or the second limiting step 411 when it moves left and right back and forth. This allows for precise adjustment of the distance between the picking components 1, enabling the variable-pitch picking device to pick up and place bars between two types of material trays with different bar placement hole spacings. The adjustment is convenient and the bar picking and placing efficiency is effectively improved.

[0055] Specifically, such as Figure 3As shown, the material handling assembly 1 includes a variable-pitch plate 11, a suction tube 12, and a vacuum generator 13. The variable-pitch plate 11 is slidably mounted on a guide shaft 2, which extends left and right to allow the variable-pitch plate 11 to move left and right. The suction tube 12 extends vertically, with its upper end connected to the variable-pitch plate 11 and its lower end used to pick up the bar stock. The vacuum generator 13 is used to create a negative pressure within the suction tube 12 to generate an adsorption force on the bar stock. An air inlet pipe 14 is provided on the suction tube 12, and the air inlet pipe 14 is connected to the suction tube 12. Preferably, the air inlet pipe 14 and the suction tube 12 are integrally formed. The vacuum generator 13 is connected to the air inlet pipe 14 via a connecting pipe, allowing the vacuum generator 13 to create a negative pressure within the suction tube 12. The connecting pipe is preferably a flexible hose for easy wiring. By sealing the upper end of the suction tube 12, the bar stock is suspended in the suction tube 12 after being sucked up under negative pressure, preventing damage such as wear and scratches to the surface of the bar stock.

[0056] Preferably, in order to improve the connection strength between the straw 12 and the variable distance plate 11, the feeding assembly 1 further includes a fixing plate 15. Two fixing plates 15 are provided, and the two fixing plates 15 are arranged opposite each other to clamp the straw 12. The upper end of the fixing plate 15 is connected to the variable distance plate 11 by bolts, which plays the role of firmly connecting the straw 12 and the variable distance plate 11, and at the same time clamping the outside of the straw 12, improving the structural strength of the straw 12.

[0057] The following is combined with Figure 2 , Figure 3 and Figure 4 The structure of the first limiting component 3 is described.

[0058] The first limiting component 3 includes a first limiting plate 31. In this embodiment, two first limiting plates 31 are provided, and the two first limiting plates 31 are respectively sleeved on the upper and lower ends of the plurality of variable-gap plates 11. Specifically, the first limiting plate 31 is provided with a first limiting hole 312. The material picking component 1 is limited within the first limiting hole 312. The front and rear walls of the first limiting hole 312 are provided with a first limiting step 311. The right side of the variable-gap plate 11 can abut against the first limiting step 311. The first limiting step 311 limits the variable-gap plate 11 to restrict the distance the variable-gap plate 11 can move to the right, so that the center distance between adjacent variable-gap plates 11 is limited to a distance H1. Of course, in other embodiments, only one or more first limiting plates 31 can be provided, which can also achieve the limiting effect on the variable-gap plate 11.

[0059] To prevent the variable pitch plate 11 from moving up and down relative to the first limiting plate 31 and disengaging from the first limiting hole 312, the guide shaft 2 extends left and right and connects to the left and right walls of the first limiting hole 312. Two guide shafts 2 are provided, and the two guide shafts 2 are respectively connected to the two first limiting plates 31, which can effectively prevent the variable pitch plate 11 from rotating around the guide shaft 2.

[0060] In this embodiment, the height H1 of the first limiting step 311 in the first direction is greater than the height H2 of the second limiting step 411 in the first direction. When the center distance of the straw 12 is adjusted from H1 to H2, the variable distance plate 11 needs to move a large distance to the left. In order for the first limiting step 311 to abut against the right side of each variable distance plate 11 and for multiple variable distance plates 11 to move smoothly to the left, the length of the portion of multiple variable distance plates 11 confined within the first limiting hole 312 decreases sequentially. That is, multiple variable distance plates 11 become shorter from left to right, forming a trapezoidal cross-section. The first limiting hole 312 is correspondingly set to a T-shape. Pushing the variable distance plate 11 to the right allows it to abut against the first limiting step 311. Since the variable distance plate 11 on the right side is shorter, it can move to the left without interference from the first limiting step 311, so that the variable distance plate 11 gradually approaches the second limiting step 411 on the second limiting plate 41 until it abuts against it.

[0061] The following is combined with Figure 2 , Figure 3 and Figure 5 The structure of the second limiting component 4 is described.

[0062] The second limiting component 4 includes a second limiting plate 41. In this embodiment, two second limiting plates 41 are provided, and the two second limiting plates 41 are sleeved on the outside of the plurality of variable distance plates 11, located between the two first limiting plates 31. Specifically, the second limiting plate 41 is provided with a second limiting hole 412, and the variable distance plate 11 is limited within the second limiting hole 412. The aforementioned second limiting step 411 is provided on the front and rear hole walls of the second limiting plate 41.

[0063] To ensure that the second limiting step 411 abuts against the left side of each pitch plate 11 and allows the multiple pitch plates 11 to move smoothly to the right, the lengths of the portions of the multiple pitch plates 11 confined within the second limiting hole 412 decrease sequentially. That is, the multiple pitch plates 11 shorten sequentially from right to left, forming a trapezoidal cross-section. The direction of decrease is opposite to the direction of decrease in length of the portions confined within the first limiting hole 312. Pushing the pitch plate 11 to the left allows it to abut against the second limiting step 411. Since the pitch plate 11 on the left is shorter, it can move to the right without interference from the second limiting step 411, allowing it to gradually approach and abut against the first limiting step 311 on the first limiting plate 31. Of course, in other embodiments, only one or more second limiting plates 41 can be provided, which can also achieve the limiting effect on the pitch plates 11.

[0064] The following is combined with Figure 2 , Figure 3 and Figure 6 The structure of the driving component 5 is described.

[0065] The pushing assembly 5 includes a pushing plate 51, which is disposed between two second limiting plates 41. A third limiting hole 513 is provided on the pushing plate 51, and the variable pitch plate 11 is limited within the third limiting hole 513. A first pushing platform 511 and a second pushing platform 512 are disposed within the third limiting hole 513. When the pushing plate 51 moves to the left, the second pushing platform 512 abuts against the right side of the variable pitch plate 11 and pushes the variable pitch plate 11 to the left; when the pushing plate 51 moves to the right, the first pushing platform 511 abuts against the left side of the variable pitch plate 11 and pushes the variable pitch plate 11 to the right.

[0066] Specifically, please refer to Figure 2 and Figure 6 The portion of the pitch plate 11 confined within the third limiting hole 513 forms a frame. The front and rear frames are respectively confined within two third limiting holes 513. The first pushing platform 511 is located on the outer side of the frame, and the second pushing platform 512 is located on the inner side of the frame. The lengths of the portions of the multiple pitch plates 11 within the third limiting holes 513 increase sequentially from left to right. The two third limiting holes 513 correspondingly form a V-shape with the opening facing right. The height of the first pushing platform 511 on the outer side of the pitch plate 11 in the left-right direction is greater than the height of the second pushing platform 512 on the inner side of the pitch plate 11 in the left-right direction. Since the pitch plate 11 on the left is shorter, when the pushing plate 51 moves to the left, the pitch plate 11 can move relatively to the right within the third limiting hole 513 and gradually approach the second pushing platform 512 until it is completely against the second pushing platform 512.

[0067] Preferably, refer to Figure 1 The pushing assembly 5 also includes a first driving member 52, which can drive the pushing plate 51 to move left and right. In this embodiment, the first driving member 52 is a cylinder, and the pushing plate 51 is connected to the driving end of the cylinder. The cylinder extends and retracts to drive the pushing plate 51 to move left and right. The cylinder barrel is bolted to the lower first limiting plate 31, which securely connects the cylinder barrel to the first limiting plate 31, thereby ensuring the stable operation of the cylinder. To facilitate the connection between the driving end of the cylinder and the pushing plate 51, a connecting plate 53 is connected to one end of the pushing plate 51 opposite to the cylinder. The connecting plate 53 is connected to the pushing plate 51 by multiple bolts. The driving end of the cylinder is connected to the connecting plate 53, and the pushing plate 51 moves by pushing the connecting plate 53 to move left and right.

[0068] Furthermore, continue to refer to Figure 1 The variable-pitch material handling device also includes two vertical plates 7, which are respectively connected to the front and rear ends of the first limiting plate 31 and the second limiting plate 41. Figure 1(The front end of the upright plate 7 is omitted). Both first limiting plates 31 and two second limiting plates 41 are connected to the upright plate 7, thus connecting the first limiting component 3 and the second limiting component 4 into a single unit via the upright plate 7, resulting in a more stable structure. Preferably, the upright plate 7 has a left-right extending groove on one side relative to the push plate 51, allowing the front and rear ends of the push plate 51 to slide left and right along the groove, thus making the movement of the push plate 51 more stable.

[0069] Furthermore, such as Figure 1 As shown, the variable-pitch material handling device also includes a second driving member 10, which can drive the material handling assembly 1 to move up and down. When picking up bar stock, the suction tube 12 needs to move upward, with the suction tube opening aligned with the upper end of the bar stock. The vacuum generator 13 is activated to create a negative pressure inside the suction tube 12, drawing the bar stock into the suction tube 12. When releasing the bar stock, the suction tube 12 needs to move downward, with the suction tube opening aligned with the bar stock placement hole on the material tray. The negative pressure inside the suction tube 12 is released, allowing the bar stock to fall into the bar stock placement hole. The suction tube 12 moves upward until the bar stock is completely removed from the suction tube 12, while simultaneously providing clearance for the material tray transfer.

[0070] like Figure 1 As shown, in order to facilitate the connection between the second driving component 10 and the material picking component 1, the variable pitch material picking device also includes a first mounting frame 8. The first mounting frame 8 is disposed on the upper first limiting plate 31. The driving end of the second driving component 10 is connected to the first mounting frame 8. The first mounting frame 8 is driven to move up and down by the second driving component 10, thereby driving the material picking component 1 to move up and down.

[0071] Preferably, see below. Figure 1 The variable-pitch material handling device also includes a second mounting frame 91. The fixed end of the second driving component 10 is connected to the second mounting frame 91 via a cylinder mounting plate 92. Specifically, the second driving component 10 is a sliding cylinder, the cylinder barrel of which is connected to the cylinder mounting plate 92, which is connected to the second mounting frame 91. The driving end of the sliding cylinder is connected to the first mounting frame 8, and the driving end of the sliding cylinder moves up and down to drive the first mounting frame 8 to move the suction pipe 12 up and down. The sliding cylinder is a commonly used device in the prior art, and its detailed structure will not be described in detail here.

[0072] like Figure 1As shown, to detect whether the bar material in the suction tube 12 is accurately inserted into the bar material placement hole on the tray, the variable-pitch feeding device also includes a detection component 6. The detection component 6 is used to detect the placement position of the bar material picked up by the feeding component 1 on the tray. Specifically, the detection component 6 is a fiber optic through-beam sensor, mounted on the second mounting bracket 91. The transmitter and receiver of the fiber optic through-beam sensor are respectively located on both sides of the suction tube 12. When releasing the bar material, the tray is placed directly below the suction tube 12. The height of the transmitter and receiver is determined according to the height of the bar material after it is normally inserted into the bar material placement hole on the tray. The beam 61 emitted by the transmitter should be close to the upper surface of the bar material. When a bar material is inserted into the bar material placement hole to an inaccurate depth, the upper end of the bar material will block the beam 61 emitted by the transmitter, thus detecting that the bar material is not accurately positioned on the tray. The operator receives the above position error information and adjusts the position of the bar material to meet the requirements.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A variable reach pick-and-place device, characterized by, The utility model relates to a material taking device, including: a plurality of material taking assemblies (1) arranged in sequence along a first direction and capable of sliding along a guide shaft (2), the material taking assemblies (1) being configured to be capable of sucking material; a first limiting assembly (3) provided with a plurality of first limiting steps (311) capable of resisting one side of the material taking assemblies (1) along the first direction; a second limiting assembly (4) provided with a plurality of second limiting steps (411) capable of resisting the other side of the material taking assemblies (1) along the first direction; a pushing assembly (5) configured to drive the material taking assemblies (1) to reciprocate along the first direction, the pushing assembly (5) being provided with a plurality of first pushing tables (511) and a plurality of second pushing tables (512), the first pushing tables (511) being capable of pushing the material taking assemblies (1) to abut against the first limiting steps (311), the second pushing tables (512) being capable of pushing the material taking assemblies (1) to abut against the second limiting steps (411), the first limiting steps (311) and the second limiting steps (411) being provided at different heights along the first direction so that the material taking assemblies (1) abut against the first limiting steps (311) and the second limiting steps (411) at different distances at different times; the material taking assemblies (1) including: distance-variable plates (11) slidingly provided on the guide shaft (2); suction pipes (12) having one end connected to the distance-variable plates (11) and the other end used for sucking the material; vacuum generators (13) configured to form negative pressure in the suction pipes (12); the first limiting assembly (3) including first limiting plates (31) provided with first limiting holes (312) in which the material taking assemblies (1) are limited, the first limiting holes (312) being provided with the first limiting steps (311) on the hole walls of both sides along the first direction, and the guide shaft (2) extending along the first direction and being connected to the hole walls of the first limiting holes (312); the lengths of the portions of a plurality of the distance-variable plates (11) limited in the first limiting holes (312) sequentially decreasing, and the distance-variable plates (11) being pushed in the decreasing direction to abut against the first limiting steps (311).

2. The variable reach takeoff according to claim 1, wherein, The first limiting plates (31) are provided at least two, and the at least two first limiting plates (31) are provided at intervals.

3. The variable reach takeoff of claim 1, wherein, the second limiting assembly (4) including second limiting plates (41) provided with second limiting holes (412) in which the distance-variable plates (11) are limited, and the second limiting holes (412) being provided with the second limiting steps (411) on the hole walls.

4. The variable reach takeoff of claim 3, wherein, The second limiting plate (41) is provided with at least two second limiting plates (41) which are arranged at intervals.

5. The variable reach takeoff of claim 3, wherein, The lengths of the portions of the plurality of variable-distance plates (11) located in the second limiting holes (412) sequentially decrease in a direction opposite to the direction in which the lengths of the portions of the variable-distance plates (11) located in the first limiting holes (312) decrease, and pushing the variable-distance plates (11) in the direction in which the lengths of the portions of the variable-distance plates (11) located in the second limiting holes (412) decrease can enable the variable-distance plates (11) to abut against the second limiting steps (411).

6. The variable reach takeoff of claim 5, wherein, The pushing assembly (5) comprises a pushing plate (51), and a third limiting hole (513) is arranged on the pushing plate (51), wherein the variable-distance plates (11) are located in the third limiting hole (513), and a first pushing step (511) and a second pushing step (512) are arranged on a hole wall of the third limiting hole (513).

7. The variable reach takeoff of claim 6, wherein, The portion of the variable-distance plate (11) located in the third limiting hole (513) is a frame, the frames on both sides in the first direction are respectively located in two third limiting holes (513), the first pushing step (511) is arranged on the outside of the frame, and the second pushing step (512) is arranged on the inside of the frame.

8. The variable reach takeoff of claim 7, wherein, The pushing assembly (5) further comprises: a first driving member (52) configured to drive the pushing plate (51) to move in the first direction.

9. The variable reach takeoff of claim 1, wherein, The variable-distance material taking device further comprises: a second driving member (10) configured to drive the material taking assembly (1) to move in a second direction, wherein the second direction is the extension direction of the suction pipe (12) and is perpendicular to the first direction.

10. A variable reach stocker according to any one of claims 1 to 9 wherein, The variable-distance material taking device further comprises: a detection assembly (6) configured to detect the placement position of the material taken by the material taking assembly (1) on the tray.

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