Turnover basket grabbing and lifting mechanism

Abstract

The utility model relates to a turnover basket grabbing and lifting mechanism which comprises a rack. The lifting frame is mounted on the rack in a sliding manner; the stopper is positioned at the upper part of the rack; the linear driving mechanism is arranged on the rack, is in transmission connection with the lifting frame and is used for driving the lifting frame to move in the vertical direction; the pair of gripper assemblies are oppositely arranged and hinged to the two sides of the lifting frame respectively; the elastic piece is used for elastically connecting the lifting frame and the single gripper assembly and keeping the trend that the two gripper assemblies rotate in the opposite directions; when the lifting frame is located on the lower portion, the gripper assembly acts on the turnover basket to overcome the elastic force of the elastic piece to grab the turnover basket. When the lifting frame is located on the upper portion, the gripper assembly and the stopping piece act to overcome the elasticity of the elastic piece and rotate oppositely to loosen the turnover basket, the turnover basket falls to the material receiving part, single power is adopted for driving to grab and lift the turnover basket, the requirement of equipment for energy is lowered, and the overall manufacturing and maintaining cost of the equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of conveying equipment, in particular to a turnover basket grabbing and lifting mechanism. Background Art

[0002] In order to improve production efficiency and the degree of automation of the production line, in the prior art, when the turnover basket is grabbed and lifted (including the process of unstacking the turnover basket), a combination of moving mechanisms in two directions is usually used to realize the grabbing and lifting of the turnover basket, and the turnover basket is moved from a low position to a high position to realize the change of the position of a single turnover basket. The grabbing and lifting mechanism often uses a combination of multiple driving modes, such as a combination of a servo motor and a cylinder to realize the automatic lifting and lowering, grabbing and other actions of the gripper.

[0003] However, due to the use of multiple power drives, and each drive needs to be equipped with detection and electrical control components, the overall manufacturing and maintenance costs are high, and pneumatic drives often have high requirements for compressed air sources. When the energy supply conditions at the production line site are limited (for example, there is no compressed air source, or the stability of compressed air cannot meet the requirements of pneumatic drives), and the overall cost of the production line and the subsequent maintenance cost control requirements are high, multiple and multiple power drive equipment cannot meet the requirements. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a turnover basket grabbing and lifting mechanism, which adopts a single power drive to achieve the grabbing and lifting of the turnover basket, reducing the energy requirements of the equipment, as well as the overall manufacturing and maintenance costs of the equipment.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A turnover basket grabbing and lifting mechanism, comprising

[0007] frame;

[0008] A lifting frame, slidably mounted on the frame;

[0009] A stopper, located at the upper part of the frame;

[0010] A linear drive mechanism, disposed on the frame and drivingly connected to the lifting frame, for driving the lifting frame to move in a vertical direction;

[0011] A pair of gripper assemblies are arranged opposite to each other and are respectively hingedly mounted on two sides of the lifting frame;

[0012] An elastic member, used for elastically connecting the lifting frame and a single gripper assembly to maintain the tendency of the two gripper assemblies to rotate towards each other;

[0013] Among them, when the lifting frame is located at the bottom, the gripper assembly acts on the turnover basket to overcome the elastic force of the elastic member and grasp the turnover basket; when the lifting frame is located at the top, the gripper assembly acts on the stopper to overcome the elastic force of the elastic member and rotate in opposite directions to release the turnover basket, so that the turnover basket falls onto the material receiving part.

[0014] As a further improvement of the above technical solution:

[0015] A set of guide shafts are installed on the frame, and the lifting frame is slidably connected with the guide shafts;

[0016] The linear drive mechanism comprises a motor arranged on the frame and a lead screw transmission-connected to the motor, a lead screw nut is mounted on the lead screw, and the lead screw nut is fixedly connected to the lifting frame.

[0017] The turnover basket is provided with a handle groove, and the handle groove corresponds to the gripper assembly. When the gripper assembly grips the turnover basket, the lower ends of the two gripper assemblies are located in the handle groove.

[0018] The turnover baskets to be grabbed are placed on the storage rack below the lifting frame, and the turnover baskets are in multiple pieces and are stacked.

[0019] The single gripper assembly comprises a hook claw, the middle part of which is hinged to the lifting frame, and the elastic member connects the hook claw and the lifting frame to maintain the tendency of the two hook claws to rotate towards each other;

[0020] The lower end of the hook corresponds to the handle groove and is used to hook the handle groove. The upper end of the hook is provided with a driving member corresponding to the stopper, which is used to contact the stopper to drive the two hooks to rotate in opposite directions to release the turnover basket. The hook also includes a limiting structure for limiting the minimum distance between the lower ends of the two hooks, and the minimum distance is adapted to the width of the turnover basket.

[0021] A transition portion is provided at the lower end of the hook. During the process of grabbing the turnover basket, the transition portion and the turnover basket are slidably matched to drive the two hooks to rotate in opposite directions.

[0022] The transition portion is an inclined surface or a roller that is slidably matched with the turnover basket.

[0023] It also includes a hinge, through which the middle part of the hook claw is hinged to the lifting frame, and the elastic member is a torsion spring installed on the hinge pin;

[0024] The hinge is located on the outside of the hook, and when the upper end surface located in the middle of the hook abuts against the lower surface of the lifting frame, the distance between the lower ends of the two hooks is the minimum distance.

[0025] It also includes a first material detection sensor for obtaining the position of the turnover basket to be grabbed, thereby controlling the vertical position of the lifting frame.

[0026] It also includes a second material detection sensor, which is used to detect whether there is a turnover basket to be grabbed.

[0027] The material receiving portion is a supporting structure intermittently located below the lifting frame, and is used to receive the falling turnover basket and avoid the lifting frame during the lifting process.

[0028] The beneficial effects of the utility model are as follows:

[0029] The utility model has a compact and reasonable structure and is easy to operate. A pair of gripper assemblies are hingedly installed on the lifting frame, and the gripper assemblies are connected to the lifting frame through elastic parts. A linear drive mechanism is used to drive the lifting frame to rise and fall. During the descent of the lifting frame, the turnover basket is automatically grabbed through the action of the gripper assembly and the turnover basket. When the material receiving part is below the turnover basket, the turnover basket is automatically released through the action of the gripper assembly and the stopper above the lifting frame, so that the turnover basket falls onto the material receiving part. A single power drive is used to grab and lift the turnover basket, thereby reducing the energy requirements of the equipment and the overall manufacturing and maintenance costs of the equipment.

[0030] The utility model also has the following advantages:

[0031] (1) The connection and limiting structure between the lifting frame and the gripper assembly are simplified by using a spring-type hinge to hinge the hooks of the lifting frame and the gripper assembly and elastically connect them at the same time.

[0032] (2) A first material detection sensor that moves synchronously with the gripper assembly is provided on the lifting frame. During the descent of the lifting frame, the height position of the first turnover basket detected by the first material detection sensor is used to control the descent position of the lifting frame, thereby enabling the sequential grabbing of multiple stacked turnover baskets and realizing automatic destacking of the turnover baskets in a simple and low-cost manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the utility model.

[0034] Figure 2 It is a three-dimensional diagram of the utility model.

[0035] Figure 3 It is a three-dimensional diagram of the utility model (another viewing angle).

[0036] Figure 4 It is a schematic diagram of the utility model in working state (gripper assembly descends).

[0037] Figure 5This is a schematic structural diagram of the gripper assembly of the present utility model.

[0038] Figure 6 This is a schematic structural diagram of the gripper assembly of the present utility model (another embodiment).

[0039] Figure 7 This is a schematic diagram of the present utility model in the working state (grabbing the turnover basket).

[0040] Figure 8 This is a schematic diagram of the present utility model in the working state (the turnover basket is falling).

[0041] Wherein:

[0042] 1. Frame; 10. Guide shaft;

[0043] 2. Lifting frame;

[0044] 3. Linear drive mechanism; 31. Motor; 32. Lead screw; 33. Lead screw nut;

[0045] 4. Stopper;

[0046] 50. Elastic member; 5. Gripper assembly; 51. Transition part; 52. Hook; 53. Hinge; 54. Driving member;

[0047] 6. Storage rack;

[0048] 7. Turnover basket; 71. Hand slot; 72. First material detection sensor; 73. Second material detection sensor;

[0049] 8. Material receiving part. Detailed implementation manners

[0050] The following combines with the attached drawings to illustrate the detailed implementation manners of the present utility model.

[0051] Embodiment 1:

[0052] As Figures 1-8 shown, the turnover basket grabbing and lifting mechanism of this embodiment includes a frame 1, a lifting frame 2, a stopper 4, a linear drive mechanism 3, a pair of gripper assemblies 5 and an elastic member 50.

[0053] The lifting frame 2 is slidably installed on the frame 1;

[0054] The stopper 4 is located at the upper part of the frame 1. Specifically, the stopper 4 is the upper frame of the frame 1;

[0055] The linear drive mechanism 3 is arranged on the frame 1 and is in transmission connection with the lifting frame 2 for driving the lifting frame 2 to move in the vertical direction;

[0056] A pair of gripper assemblies 5 are oppositely arranged and are respectively hinged and installed on both sides of the lifting frame 2;

[0057] The elastic member 50 is used to elastically connect the lifting frame 2 and the single gripper assembly 5 to maintain the tendency of the two gripper assemblies 5 to rotate toward each other;

[0058] When the lifting frame 2 is at the bottom, the gripper assembly 5 acts on the turnover basket 7 to overcome the elastic force of the elastic member 50 and grab the turnover basket 7; when the lifting frame 2 is at the top, the gripper assembly 5 acts on the stopper 4 to overcome the elastic force of the elastic member 50 and rotate in opposite directions to release the turnover basket 7, so that the turnover basket 7 falls onto the material receiving portion 8.

[0059] The linear drive mechanism 3 is preferably driven by electricity, and can be driven by a servo motor or a servo electric cylinder. The movable end of the linear drive mechanism 3 is connected to the lifting frame 2. Figure 1 , Figure 3 As shown, a set of guide shafts 10 are installed on the frame 1, and the lifting frame 2 is slidably connected with the guide shafts 10;

[0060] The linear drive mechanism 3 includes a motor 31 disposed on the frame 1 and a lead screw 32 drivingly connected to the motor 31 . A lead screw nut 33 is mounted on the lead screw 32 , and the lead screw nut 33 is fixedly connected to the lifting frame 2 .

[0061] like Figure 2 As shown, a handle groove 71 is provided on the turnover basket 7 , and the handle groove 71 corresponds to the gripper assembly 5 . When the gripper assembly 5 grips the turnover basket 7 , the lower ends of the two gripper assemblies 5 are located in the handle groove 71 .

[0062] The turnover basket 7 to be grabbed can be one piece. In this embodiment, the turnover basket 7 to be grabbed is placed on the storage rack 6 below the lifting frame 2. The number of turnover baskets 7 is multiple and they are stacked.

[0063] The turnover basket 7 can be a standard turnover basket or a customized frame-type transfer tooling, as long as the rectangular shape is maintained and handle grooves 71 are set on both sides. The handle grooves 71 are rectangular grooves with a certain depth. A pair of gripper assemblies 5 correspond to two opposite sides of the turnover basket 7. Figure 1 , Figure 7 As shown, when the gripper assembly 5 grasps the turnover basket 7, the gripper assembly 5 maintains a tendency to rotate toward each other under the action of the elastic member 50, and the two gripper assemblies 5 contact the upper edge of the turnover basket 7 and rotate away from each other to open. After the lower end of the gripper assembly 5 is located on the outside of the handle groove 71, it rotates toward each other under the elastic force of the elastic member 50, so that the lower end of the gripper assembly 5 is located in the handle groove 71 and hooks the side wall position of the handle groove 71.

[0064] The turnover basket 7 to be grabbed is set on the ground below the lifting frame 2 and supported by the storage rack 6. Figure 1 ,Figure 2 As shown, the turnover basket 7 can be manually carried to the rack 6, or it can be transferred to the rack 6 by automatic transportation. Of course, the rack 6 can be a part of the conveying tool structure.

[0065] The working process of the turnover basket grabbing and lifting mechanism of this embodiment is as follows:

[0066] 1. The lifting frame 2 descends to grab the turnover basket 7 on the storage rack 6. The process of grabbing the turnover basket 7 is as follows: Figure 7 As shown, the gripper assembly 5 acts on the turnover basket 7 , and after overcoming the elastic force of the elastic member 50 , the lower end of the gripper assembly 5 is located in the handle groove 71 .

[0067] 2. During the ascending process of the lifting frame 2, the lower end of the gripper assembly 5 hooks the handle groove 71 to lift the turnover basket 7. Figure 7 shown.

[0068] 3. When the turnover basket 7 is lifted to a height higher than the material receiving portion 8, the material receiving portion 8 moves to the bottom of the turnover basket 7. Figure 8 As shown;

[0069] 4. When the lifting frame 2 is at the uppermost position, the gripper assembly 5 and the stopper 4 work together to overcome the elastic force of the elastic member 50 and rotate in opposite directions, and then the turnover basket 7 is released, and the turnover basket falls to the material receiving portion 8. Figure 8 As shown, after the material receiving portion 8 moves, the turnover basket 7 is transferred.

[0070] In the above process, only the height position of the lifting frame 2 needs to be controlled and monitored, and the manufacturing and maintenance costs of the control system are also relatively low.

[0071] A pair of gripper assemblies 5 are hingedly installed on the lifting frame 2, and the gripper assemblies 5 are connected to the lifting frame 2 through an elastic member 50. A linear drive mechanism 3 is used to drive the lifting frame 2 to rise and fall. During the descent of the lifting frame 2, the turnover basket 7 is automatically grabbed through the action of the gripper assembly 5 and the turnover basket 7. When the material receiving portion 8 is below the turnover basket 7, the turnover basket 7 is automatically released through the action of the gripper assembly 5 and the stopper 4 above the lifting frame 2, so that the turnover basket 7 falls onto the material receiving portion 8. A single power drive is used to grab and lift the turnover basket 7, thereby reducing the energy requirements of the equipment and the overall manufacturing and maintenance costs of the equipment.

[0072] The material receiving portion 8 is a supporting structure intermittently located below the lifting frame 2, and is used to receive the falling turnover basket 7 and avoid the lifting frame 2 during the lifting process.

[0073] Specifically, the material receiving portion 8 may be a telescopic end of a telescopic belt conveyor line, or may be a rotating platform or a transverse platform that automatically moves to the bottom of the lifting frame 2 .

[0074] Embodiment 2:

[0075] On the basis of the first embodiment, the gripper assembly 5 is further optimized. As Figure 5 , Figure 6 shown, a single gripper assembly 5 of this embodiment includes a claw 52. The middle part of the claw 52 is hinged to the lifting frame 2. An elastic member 50 connects the claw 52 and the lifting frame 2 and is used to maintain the tendency of the two claws 52 to rotate towards each other;

[0076] The lower end of the claw 52 corresponds to the handle groove 71 and is used to hook the handle groove 71. A driving member 54 corresponding to the stopper 4 is arranged at the upper end of the claw 52 and is used to contact the stopper 4 to drive the two claws 52 to rotate away from each other to release the turnover basket 7. It also includes a limiting structure for limiting the minimum distance between the lower ends of the two claws 52, and the minimum distance is adapted to the width of the turnover basket 7;

[0077] A transition portion 51 is arranged at the lower end of the claw 52. During the process of grasping the turnover basket 7, the transition portion 51 is in sliding fit with the turnover basket 7 and is used to drive the two claws 52 to rotate away from each other.

[0078] In this embodiment, the transition portion 51 is an inclined surface in sliding fit with the turnover basket 7, as Figure 5 shown. Specifically, the inclined surface is in sliding fit with the upper edge of the turnover basket 7 and is used to make the two claws 52 rotate away from each other.

[0079] In another embodiment, the transition portion 51 is a roller in sliding fit with the turnover basket 7, as Figure 6 , Figure 7 shown. Specifically, a fixed shaft is arranged below the hooking portion of the claw 52. The two ends of the fixed shaft are rotatably installed with rollers. The rollers are in sliding fit with the upper edge and the side surface of the turnover basket 7 and are used to make the two claws 52 rotate away from each other and slide downward.

[0080] In this embodiment, the elastic member 50 can be a spring in a stretched state. The limiting structure is located on the lifting frame 2 or the claw 52 (not shown in the drawings) and limits the swinging amplitude of the claw 52. When the two claws 52 are in the grasping state, the rotating position of the claw 52 is limited by the limiting structure to ensure the minimum distance between the two claws 52. The minimum distance is used to ensure that the transition portion 51 can slide relative to the upper edge of the turnover basket 7 and can hook the handle groove 71.

[0081] In order to simplify the structure while keeping the function of the gripper assembly 5 unchanged, in another embodiment, as Figure 5 , Figure 6 shown, it further includes a hinge 53. The middle part of the claw 52 is hinged to the lifting frame 2 through the hinge 53, and the elastic member 50 is a torsion spring installed on the pin shaft of the hinge 53;

[0082] The hinge 53 is located outside the claw 52. When the upper end surface in the middle of the claw 52 abuts against the lower surface of the lifting frame 2, the distance between the lower ends of the two claws 52 is the minimum distance.

[0083] Specifically, the combination of the hinge 53 and the elastic member 50 is a spring-type hinge, which is a commercially available product. The hinge 53 is located outside the claw 52, and the abutment of the upper end surface in the middle of the claw 52 against the lower surface of the lifting frame 2 is used as a limiting structure, simplifying the connection structure between the gripper assembly 5 and the lifting frame 2.

[0084] In the above embodiments, by using a spring-type hinge to hinge and elastically connect the lifting frame 2 and the claw 52 of the gripper assembly 5, the connection and limiting structures between the lifting frame 2 and the gripper assembly 5 are simplified.

[0085] Embodiment Three:

[0086] When the turnover baskets 7 to be grabbed are multiple turnover baskets 7 stacked one above the other, it is a stack as Figure 1 shown. When the feeding device needs to descend to grab the turnover basket 7, it controls the position of the lifting frame 2, and thus controls the position of the gripper assembly 5.

[0087] Based on the above embodiments, the turnover basket grabbing and lifting mechanism of this embodiment further includes a first material detection sensor 72, which is used to obtain the position of the turnover basket 7 to be grabbed, and thus control the vertical position of the lifting frame 2.

[0088] Specifically, the first material detection sensor 72 is a photoelectric sensor, which is fixedly installed on the lifting frame 2 and is used to detect the material box 7 approaching the gripper assembly 5 from the side.

[0089] The process of the turnover basket grabbing and lifting mechanism of this embodiment for grabbing the material box 7 is as follows:

[0090] First step: Stack multiple turnover baskets 7 of the same specification on the storage rack 6;

[0091] Second step: The linear drive mechanism 3 drives the lifting frame 2 to descend. When the first material detection sensor 72 detects that there is a turnover basket 7, which is the first turnover basket 7 at the top, the lifting frame 2 continues to descend a certain distance, so that the gripper assembly 5 contacts the first turnover basket 7 and grabs the first turnover basket 7;

[0092] Third step: The linear drive mechanism 3 drives the lifting frame 2 to rise until the gripper assembly 5 acts on the stopper 4, and the gripper assembly 5 rotates away from each other to release the turnover basket 7 onto the receiving part 8;

[0093] Repeat the second and third steps until all the turnover baskets 7 on the storage rack 6 are transferred onto the receiving part 8.

[0094] Further, in order to confirm whether the turnover baskets 7 on the storage rack 6 have been completely grabbed, a second material detection sensor 73 is further included. The second material detection sensor 73 is used to detect whether there is a turnover basket 7 to be grabbed. The second material detection sensor 73 corresponds to the side surface of the lowermost turnover basket 7 on the storage rack 6.

[0095] By arranging a first material detection sensor 72 on the lifting frame 2 that moves synchronously with the gripper assembly 5, during the downward movement of the lifting frame 2, according to the height position of the first turnover basket 7 detected by the first material detection sensor 72, the position of the downward movement of the lifting frame 2 is controlled, so as to realize the sequential grabbing of multiple stacked turnover baskets 7, and the automatic palletizing of the turnover baskets 7 is realized in a simple and low-cost manner.

[0096] Since the space range of the handle groove 71 is relatively large, the requirements for the placement accuracy and placement posture of the turnover basket 7 by the turnover basket grabbing and lifting mechanism of this embodiment are not high. As Figure 1 shown, the turnover basket 7 can be tilted at a certain angle.

[0097] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention is referred to the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A turnover basket grasping and lifting mechanism, characterized in that: including a frame (1); a lifting frame (2), slidably mounted on the frame (1); a stopper (4), located at the upper part of the frame (1); a linear drive mechanism (3), arranged on the frame (1) and drivingly connected to the lifting frame (2) for driving the lifting frame (2) to move in the vertical direction; a pair of gripper assemblies (5), oppositely arranged and respectively hingedly mounted on both sides of the lifting frame (2); an elastic member (50) for elastically connecting the lifting frame (2) and a single gripper assembly (5) to keep the two gripper assemblies (5) in a tendency of rotating towards each other; wherein, when the lifting frame (2) is located below, the gripper assembly (5) acts on the turnover basket (7) to overcome the elastic force of the elastic member (50) and grab the turnover basket (7); when the lifting frame (2) is located above, the gripper assembly (5) acts on the stopper (4) to overcome the elastic force of the elastic member (50) and rotate away from each other to release the turnover basket (7), so that the turnover basket (7) falls onto the material receiving part (8).

2. The turnover basket grasping and lifting mechanism according to claim 1, characterized in that: A set of guide shafts (10) is mounted on the frame (1), and the lifting frame (2) is slidably connected to the guide shafts (10); The linear drive mechanism (3) includes a motor (31) arranged on the frame (1) and a lead screw (32) drivingly connected to the motor (31). A lead screw nut (33) is mounted on the lead screw (32), and the lead screw nut (33) is fixedly connected to the lifting frame (2).

3. The turnover basket grasping and lifting mechanism according to claim 1, characterized in that: A handle groove (71) is provided on the turnover basket (7), and the handle groove (71) corresponds to the gripper assembly (5). When the gripper assembly (5) grabs the turnover basket (7), the lower ends of the two gripper assemblies (5) are located in the handle groove (71).

4. The turnover basket grasping and lifting mechanism according to claim 3, characterized in that: The turnover baskets (7) to be grabbed are placed on a storage rack (6) below the lifting frame (2), and the number of turnover baskets (7) is multiple and they are stacked.

5. The turnover basket grasping and lifting mechanism according to claim 3, wherein: A single gripper assembly (5) includes a hook claw (52), the middle of the hook claw (52) is hinged to the lifting frame (2), and the elastic member (50) connects the hook claw (52) and the lifting frame (2) to keep the two hook claws (52) in a tendency of rotating towards each other; The lower end of the hook claw (52) corresponds to the handle groove (71) for hooking the handle groove (71), and a driving member (54) corresponding to the stopper (4) is provided at the upper end of the hook claw (52) for contacting the stopper (4) to drive the two hook claws (52) to rotate away from each other to release the turnover basket (7). It also includes a limiting structure for limiting the minimum distance between the lower ends of the two hook claws (52), and the minimum distance is adapted to the width of the turnover basket (7); A transition portion (51) is provided at the lower end of the hook claw (52). During the process of grabbing the turnover basket (7), the transition portion (51) is in sliding fit with the turnover basket (7) for driving the two hook claws (52) to rotate away from each other.

6. The turnover basket grasping and lifting mechanism according to claim 5, wherein: The transition portion (51) is an inclined surface or a roller in sliding fit with the turnover basket (7).

7. The turnover basket grasping and lifting mechanism according to claim 5, characterized in that: It further includes a hinge (53). The middle part of the claw (52) is hinged to the lifting frame (2) through the hinge (53), and the elastic member (50) is a torsion spring installed on the pin shaft of the hinge (53). The hinge (53) is located outside the claw (52). When the upper end surface of the middle part of the claw (52) abuts against the lower surface of the lifting frame (2), the distance between the lower ends of the two claws (52) is the minimum distance.

8. The turnover basket grasping and lifting mechanism according to claim 1, characterized in that: It further includes a first material detection sensor (72) for obtaining the position of the turnover basket (7) to be grasped, and then controlling the vertical position of the lifting frame (2).

9. The turnover box grasping and lifting mechanism according to claim 1, wherein: It further includes a second material detection sensor (73) for detecting whether there is a turnover basket (7) to be grasped.

10. The turnover basket grasping and lifting mechanism according to claim 1, characterized in that: The material receiving part (8) is a support structure that intermittently locates below the lifting frame (2) for receiving the falling turnover basket (7) and avoiding the lifting frame (2) during the lifting process.

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