Water reducing agent packaging and transporting device

Abstract

The invention discloses a water reducing agent packaging and transporting device, which relates to the technical field of packaging and transporting, and comprises a support frame, a storage barrel, a blanking pipe, a valve, a conveying belt, an opening mechanism and a moving mechanism. By arranging the opening mechanism and the moving mechanism, a packaging bag is placed between two rotating belts, the packaging bag moves to the position between two suction cups, the suction cups suck one side of the packaging bag, the suction cups move to pull open a bag opening of the packaging bag, a conical plate moves to enter the packaging bag, and the opening of the packaging bag slides to be opened along the outer wall of the conical plate; when the opening edge of the packaging bag moves to the outer side of the clamping ring, the positioning plate and the clamping ring clamp the opening of the packaging bag together, the opening is kept open, the top ring and the packaging bag move to the bottom end of the discharging pipe, the powder falls into the packaging bag, the opening of the packaging bag can be automatically opened conveniently, and the packaging efficiency is improved. And the water reducing agent powder is automatically packaged, so that the transportation operation is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of packaging and transportation, in particular to a water reducing agent packaging and transportation device. Background Art

[0002] Water reducers are concrete admixtures that can reduce mixing water consumption while maintaining a relatively constant concrete slump. Most are anionic surfactants, such as lignin sulfonates and naphthalene sulfonate formaldehyde polymers. When added to the concrete mix, they disperse cement particles, improving workability, reducing specific water usage, and improving the fluidity of the concrete mix; or reducing specific cement usage, thus saving cement. However, packaging water reducer powder requires the operator to manually open the bag, insert it onto the discharge pipe, remove it after loading, and insert a new bag. This is a complex operation. To automatically package and transport water reducer powder, a water reducer packaging and transportation device has been developed. Summary of the Invention

[0003] The purpose of the present invention is to provide a water reducing agent packaging and transportation device in order to achieve the purpose of automatically packaging and transporting water reducing agent powder.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a water reducer packaging and transportation device, comprising a support frame, the top of the support frame is fixedly connected to a storage barrel, the bottom end of the storage barrel is fixedly connected to a discharge pipe, the outer wall of the discharge pipe is installed with a valve, a conveyor belt is arranged below the discharge pipe, the opening of the packaging bag is opened by an opening mechanism, and the packaging bag is moved by a moving mechanism, the opening mechanism includes a base, the base is arranged at one end of the conveyor belt, the top of the base is symmetrically connected to a rotating wheel, the outer wall of the rotating wheel is connected to a rotating belt, a third motor is installed on the outer wall of the base, the bottom ends of the two rotating wheels are fixedly connected to spur gears, one of the spur gears is connected to the output end of the third motor, and the two spur gears are in contact.

[0005] As a further solution of the present invention: the opening mechanism also includes a mounting seat, which is arranged at the bottom end of the base, and the top of the mounting seat is symmetrically slidably connected to a movable plate, a first motor is installed on one side of the mounting seat, the output end of the first motor is connected to a first threaded rod, the first threaded rod passes through the movable plate, one end of the mounting seat is fixedly connected to a horizontal plate, the top of the horizontal plate is fixedly connected to a connecting pipe, an air pump is installed on the outer wall of the connecting pipe, the top of the movable plate is fixedly connected to a mounting pipe, one end of the mounting pipe is fixedly connected to a suction cup, the other end of the mounting pipe is fixedly connected to a hose, and the hose is connected to the connecting pipe.

[0006] As a further solution of the present invention: the moving mechanism includes a displacement seat, which is arranged on one side of the base, a displacement groove is provided at the top of the displacement seat, and a displacement rod is slidably connected to the inner wall of the displacement groove. A second motor is installed at one end of the displacement seat, and the output end of the second motor is connected to a second threaded rod, which passes through the displacement rod, and a sliding groove is provided on the outer wall of the displacement rod. A hydraulic cylinder is installed at the top of the displacement rod, and the output end of the hydraulic cylinder is connected to a slide, which is slidably connected to the inner wall of the slide groove.

[0007] As a further solution of the present invention: the moving mechanism also includes a top ring, which is fixedly connected to one end of the skateboard, the bottom end of the top ring is fixedly connected to a clamping ring, the bottom end of the clamping ring is fixedly connected to a conical plate, the bottom end of the top ring is symmetrically provided with a positioning groove, the inner wall of the positioning groove is slidably connected to the positioning plate, the interior of the top ring is rotatably connected to a third threaded rod that passes through the positioning plate, one end of the third threaded rod is fixedly connected to a first bevel gear, the interior of the top ring is located on the outer wall of the first bevel gear and is rotatably connected to a gear ring, a fourth motor is installed inside the skateboard, the output end of the fourth motor is connected to a connecting shaft, one end of the connecting shaft is fixedly connected to a second bevel gear, and the second bevel gear is in contact with the gear ring.

[0008] As a further solution of the present invention: the two spur gears are meshed with each other, and the outer wall of the rotating wheel is in contact with the inner wall of the rotating belt.

[0009] As a further solution of the present invention: the outer wall of the first threaded rod is symmetrically provided with external threads, the outer wall of the movable plate is provided with a first threaded hole, and the first threaded hole matches the external threads.

[0010] As a further solution of the present invention, the inner wall of the chute is in contact with the outer wall of the slide plate.

[0011] As a further solution of the present invention: the outer wall of the gear ring is provided with gear teeth, the gear teeth are engaged with the second bevel gear, and the gear teeth are engaged with the first bevel gear.

[0012] As a further solution of the present invention: a third threaded hole is opened on the outer wall of the positioning plate, the third threaded hole matches the third threaded rod, and the inner wall of the positioning groove fits with the outer wall of the positioning plate.

[0013] As a further solution of the present invention: the inner wall of the displacement groove fits with the outer wall of the displacement rod, the outer wall of the displacement rod is provided with a second threaded hole, the second threaded hole matches the second threaded rod, and the outer wall of the base is located above the conveyor belt and is fixedly connected to two limit rods.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By setting an opening mechanism and a moving mechanism, the packaging bag is placed between the two rotating belts, the packaging bag is moved between the two suction cups, the suction cups suck one side of the packaging bag, the suction cups move to open the bag opening of the packaging bag, the conical plate moves into the packaging bag, and the opening of the packaging bag slides and opens along the outer wall of the conical plate until the opening edge of the packaging bag moves to the outside of the clamping ring, the positioning plate and the clamping ring together clamp the opening of the packaging bag and keep the opening open, the top ring and the packaging bag are moved to the bottom end of the discharge pipe, and the powder falls into the packaging bag, which is convenient for automatically opening the opening of the packaging bag and automatically packaging the water reducer powder to facilitate transportation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 Schematic diagram of the installation of the limiting rod of the present invention; Figure 3 It is a structural schematic diagram of the base of the present invention; Figure 4 It is a structural schematic diagram of the mounting base of the present invention; Figure 5 is a cross-sectional view of the displacement seat of the present invention; Figure 6 This is a schematic diagram of the installation of the gear ring of the present invention; Figure 7 2 is a cross-sectional view of the top ring of the present invention.

[0016] Figure: 1, support frame; 2, storage barrel; 3, discharge pipe; 4, valve; 5, conveyor belt; 6, opening mechanism; 601, base; 602, rotating wheel; 603, rotating belt; 604, spur gear; 605, third motor; 606, mounting base; 607, movable plate; 608, first motor; 609, first threaded rod; 610, horizontal plate; 611, suction cup; 612, mounting pipe; 613, hose; 614, connecting pipe; 615, air pump; 7, moving mechanism ;701, displacement seat; 702, displacement groove; 703, displacement rod; 704, second motor; 705, second threaded rod; 706, slide groove; 707, hydraulic cylinder; 708, slide plate; 709, top ring; 710, clamping ring; 711, conical plate; 712, positioning groove; 713, positioning plate; 714, third threaded rod; 715, first bevel gear; 716, gear ring; 717, second bevel gear; 718, connecting shaft; 719, fourth motor; 8, limit rod. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or connected in one piece; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0019] See also Figures 1 to 7In an embodiment of the present invention, a water reducer packaging and transportation device includes a support frame 1, the top of the support frame 1 is fixedly connected to a storage barrel 2, the bottom end of the storage barrel 2 is fixedly connected to a discharge pipe 3, the outer wall of the discharge pipe 3 is installed with a valve 4, and a conveyor belt 5 is provided below the discharge pipe 3. The opening of the packaging bag is opened by an opening mechanism 6, and the packaging bag is moved by a moving mechanism 7. The opening mechanism 6 includes a base 601, the base 601 is arranged at one end of the conveyor belt 5, the top of the base 601 is symmetrically connected to a rotating wheel 602, the outer wall of the rotating wheel 602 is connected to a rotating belt 603, and the outer wall of the base 601 is installed with a third motor 605, the bottom ends of the two rotating wheels 602 are fixedly connected to a spur gear 604, and one spur gear 604 is connected to the output end of the third motor 605. The spur gears 604 are in contact with each other, and the opening mechanism 6 also includes a mounting seat 606, which is arranged at the bottom end of the base 601, and the top of the mounting seat 606 is symmetrically slidably connected to the movable plate 607, and a first motor 608 is installed on one side of the mounting seat 606, and the output end of the first motor 608 is connected to the first threaded rod 609, and the first threaded rod 609 passes through the movable plate 607, and one end of the mounting seat 606 is fixedly connected to the horizontal plate 610, and the top of the horizontal plate 610 is fixedly connected to the connecting pipe 614, and the outer wall of the connecting pipe 614 is installed with an air pump 615, and the top of the movable plate 607 is fixedly connected to the mounting pipe 612, and one end of the mounting pipe 612 is fixedly connected to the suction cup 611, and the other end of the mounting pipe 612 is fixedly connected to the hose 613, and the hose 613 is connected to the connecting pipe 614.

[0020] In this embodiment, a packaging bag is placed between the two rotating belts 603, and the third motor 605 is started. The third motor 605 drives the spur gear 604 to rotate, and the rotation of one spur gear 604 drives the other spur gear 604 to rotate in the opposite direction. The rotation of the spur gear 604 drives the rotating wheel 602 to rotate, and the rotation of the rotating wheel 602 drives the rotating belt 603 to rotate. The rotation of the rotating belt 603 drives the packaging bag to move. The packaging bag moves to between the two suction cups 611, and the first motor 608 is started. The operation of the first motor 608 drives the first threaded rod 609 rotates, and the first threaded rod 609 rotates to drive the two movable plates 607 to move in the opposite direction. The displacement of the movable plate 607 drives the installation tube 612 to move, and the displacement of the installation tube 612 drives the suction cup 611 to move. The two suction cups 611 move and contact with the two sides of the packaging bag. The air pump 615 is started, and the suction cup 611 sucks one side of the packaging bag. Then the movable plates 607 move away from each other and move. The displacement of the movable plate 607 drives the suction cup 611 to move through the installation tube 612. The displacement of the suction cup 611 opens the bag opening of the packaging bag, so that the bag opening of the packaging bag can be automatically opened.

[0021] Please refer to Figures 2 to 7, the moving mechanism 7 includes a displacement seat 701, the displacement seat 701 is arranged on one side of the base 601, the top of the displacement seat 701 is provided with a displacement groove 702, the inner wall of the displacement groove 702 is slidably connected with a displacement rod 703, one end of the displacement seat 701 is installed with a second motor 704, the output end of the second motor 704 is connected with a second threaded rod 705, the second threaded rod 705 passes through the displacement rod 703, the outer wall of the displacement rod 703 is provided with a slide groove 706, the top of the displacement rod 703 is installed with a hydraulic cylinder 707, the output end of the hydraulic cylinder 707 is connected with a slide plate 708, the slide plate 708 is slidably connected to the inner wall of the slide groove 706, the moving mechanism 7 also includes a top ring 709, the top ring 709 is fixedly connected to one end of the slide plate 708, the top ring 70 9 is fixedly connected to the bottom end of the clamping ring 710, and the bottom end of the clamping ring 710 is fixedly connected to the conical plate 711. The bottom end of the top ring 709 is symmetrically provided with a positioning groove 712, and the inner wall of the positioning groove 712 is slidably connected to the positioning plate 713. The inside of the top ring 709 is rotatably connected to the third threaded rod 714 that runs through the positioning plate 713. One end of the third threaded rod 714 is fixedly connected to the first bevel gear 715. The inside of the top ring 709 is located on the outer wall of the first bevel gear 715 and is rotatably connected to the gear ring 716. A fourth motor 719 is installed inside the skateboard 708, and the output end of the fourth motor 719 is connected to a connecting shaft 718. One end of the connecting shaft 718 is fixedly connected to the second bevel gear 717, and the second bevel gear 717 is in contact with the gear ring 716.

[0022] In this embodiment, after the packaging bag is opened, the hydraulic cylinder 707 is started, and the operation of the hydraulic cylinder 707 drives the slide plate 708 to move. The slide plate 708 moves downward along the slide groove 706. The displacement of the slide plate 708 drives the top ring 709, the clamping ring 710 and the conical plate 711 to move synchronously. The conical plate 711 moves into the packaging bag, and the opening of the packaging bag slides and opens along the outer wall of the conical plate 711 until the opening edge of the packaging bag moves to the outside of the clamping ring 710. Then the fourth motor 719 is started, and the operation of the fourth motor 719 drives the connecting shaft 718 to rotate. The rotation of 718 drives the second bevel gear 717 to rotate, the rotation of the second bevel gear 717 drives the gear ring 716 to rotate, the rotation of the gear ring 716 drives the first bevel gear 715 to rotate, the rotation of the first bevel gear 715 drives the third threaded rod 714 to rotate, the rotation of the third threaded rod 714 drives the positioning plate 713 to move, the positioning plate 713 moves along the positioning groove 712, the positioning plate 713 moves and contacts the packaging bag, the positioning plate 713 and the clamping ring 710 together clamp the opening of the packaging bag and keep the opening open. After completion, start the second motor 704, and the second motor 704 drives the second threaded rod 705 to rotate. The rotation of the second threaded rod 705 drives the displacement rod 703 to displace. The displacement rod 703 slides in the displacement groove 702, driving the top ring 709 and the packaging bag to move to the bottom end of the discharge pipe 3. The valve 4 controls to open the discharge pipe 3, and the powder falls into the packaging bag. After completion, the discharge is stopped, and the hydraulic cylinder 707 is started to drive the top ring 709 to move downward. The top ring 709 is displaced to place the packaging bag on the top of the conveyor belt 5. The conveyor belt 5 transports the packaging bag to the next process. The limit rod 8 supports the packaging bag to prevent the packaging bag from tipping over, so as to automatically open the opening of the packaging bag and automatically package the water reducer powder to facilitate transportation operations.

[0023] Please refer to Figures 1 to 4 , the two spur gears 604 are meshed with each other, and the outer wall of the rotating wheel 602 is in contact with the inner wall of the rotating belt 603.

[0024] In this embodiment, the third motor 605 drives the spur gear 604 to rotate. The rotation of one spur gear 604 drives the other spur gear 604 to rotate in the opposite direction. The rotation of the spur gear 604 drives the rotating wheel 602 to rotate. The rotation of the rotating wheel 602 drives the rotating belt 603 to rotate.

[0025] Please refer to Figures 1 to 4 The outer wall of the first threaded rod 609 is symmetrically provided with external threads, and the outer wall of the movable plate 607 is provided with a first threaded hole, which matches the external threads.

[0026] In this embodiment, the operation of the first motor 608 drives the first threaded rod 609 to rotate, and the rotation of the first threaded rod 609 drives the two movable plates 607 to move in opposite directions. The displacement of the movable plate 607 drives the installation tube 612 to move, and the displacement of the installation tube 612 drives the suction cup 611 to move.

[0027] Please refer to Figures 2 to 7 , the inner wall of the slide groove 706 fits with the outer wall of the slide plate 708.

[0028] In this embodiment, the hydraulic cylinder 707 operates to drive the slide plate 708 to move, and the slide plate 708 moves downward along the slide groove 706.

[0029] Please refer to Figures 2 to 7 The outer wall of the gear ring 716 is provided with gear teeth, which mesh with the second bevel gear 717 and the first bevel gear 715 .

[0030] In this embodiment, the fourth motor 719 rotates to drive the connecting shaft 718 to rotate. The rotation of the connecting shaft 718 drives the second bevel gear 717 to rotate. The rotation of the second bevel gear 717 drives the gear ring 716 to rotate. The rotation of the gear ring 716 drives the first bevel gear 715 to rotate.

[0031] Please refer to Figures 2 to 7 A third threaded hole is formed on the outer wall of the positioning plate 713 , and the third threaded hole matches the third threaded rod 714 . The inner wall of the positioning groove 712 fits the outer wall of the positioning plate 713 .

[0032] In this embodiment: the first bevel gear 715 rotates to drive the third threaded rod 714 to rotate, and the third threaded rod 714 rotates to drive the positioning plate 713 to move, and the positioning plate 713 moves along the positioning groove 712. The positioning plate 713 moves and contacts the packaging bag. The positioning plate 713 and the clamping ring 710 together clamp the opening of the packaging bag.

[0033] Please refer to Figures 2 to 7 The inner wall of the displacement groove 702 fits with the outer wall of the displacement rod 703. The outer wall of the displacement rod 703 is provided with a second threaded hole, which matches the second threaded rod 705. The outer wall of the base 601 is located above the conveyor belt 5 and is fixedly connected to two limit rods 8.

[0034] In this embodiment: the second motor 704 drives the second threaded rod 705 to rotate, and the rotation of the second threaded rod 705 drives the displacement rod 703 to displace, and the displacement rod 703 slides in the displacement groove 702; the packaging bag is placed on the top of the conveyor belt 5, and the conveyor belt 5 transports the packaging bag to the next process. The limit rod 8 supports the packaging bag in a limited position to prevent the packaging bag from tipping over.

[0035] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A water reducing agent packaging and transportation device, comprising a support frame (1), characterized in that: The top of the support frame (1) is fixedly connected to a storage barrel (2), the bottom of the storage barrel (2) is fixedly connected to a discharge pipe (3), the outer wall of the discharge pipe (3) is installed with a valve (4), a conveyor belt (5) is arranged below the discharge pipe (3), the opening of the packaging bag is opened by an opening mechanism (6), and the packaging bag is moved by a moving mechanism (7), the opening mechanism (6) comprises a base (601), the base (601) is arranged at one end of the conveyor belt (5), the top of the base (601) is symmetrically connected to a rotating wheel (602), the outer wall of the rotating wheel (602) is connected to a rotating belt (603), the outer wall of the base (601) is installed with a third motor (605), the bottom ends of the two rotating wheels (602) are fixedly connected to spur gears (604), one of the spur gears (604) is connected to the output end of the third motor (605), and the two spur gears (604) are in contact with each other.

2. A water reducing agent packaging and transportation device according to claim 1, characterized in that: The opening mechanism (6) further comprises a mounting seat (606), the mounting seat (606) being arranged at the bottom end of the base (601), the top end of the mounting seat (606) being symmetrically slidably connected to a movable plate (607), a first motor (608) being mounted on one side of the mounting seat (606), an output end of the first motor (608) being connected to a first threaded rod (609), the first threaded rod (609) being passed through the movable plate (607), and the mounting seat (606) being symmetrically slidably connected to a movable plate (607). One end is fixedly connected to a horizontal plate (610), the top end of the horizontal plate (610) is fixedly connected to a connecting pipe (614), the outer wall of the connecting pipe (614) is installed with an air pump (615), the top end of the movable plate (607) is fixedly connected to a mounting pipe (612), one end of the mounting pipe (612) is fixedly connected to a suction cup (611), the other end of the mounting pipe (612) is fixedly connected to a hose (613), and the hose (613) is connected to the connecting pipe (614).

3. A water reducing agent packaging and transportation device according to claim 2, characterized in that: The moving mechanism (7) includes a displacement seat (701), the displacement seat (701) is arranged on one side of the base (601), a displacement groove (702) is provided at the top of the displacement seat (701), and a displacement rod (703) is slidably connected to the inner wall of the displacement groove (702), a second motor (704) is installed at one end of the displacement seat (701), an output end of the second motor (704) is connected to a second threaded rod (705), the second threaded rod (705) passes through the displacement rod (703), a sliding groove (706) is provided on the outer wall of the displacement rod (703), a hydraulic cylinder (707) is installed at the top of the displacement rod (703), an output end of the hydraulic cylinder (707) is connected to a slide plate (708), and the slide plate (708) is slidably connected to the inner wall of the slide groove (706).

4. A water reducing agent packaging and transportation device according to claim 3, characterized in that: The moving mechanism (7) further comprises a top ring (709), the top ring (709) being fixedly connected to one end of the slide plate (708), the bottom end of the top ring (709) being fixedly connected to a clamping ring (710), the bottom end of the clamping ring (710) being fixedly connected to a conical plate (711), the bottom end of the top ring (709) being symmetrically provided with a positioning groove (712), the inner wall of the positioning groove (712) being slidably connected to a positioning plate (713), the interior of the top ring (709) being rotatably connected to a third screw thread penetrating the positioning plate (713), A threaded rod (714), one end of the third threaded rod (714) is fixedly connected to a first bevel gear (715), the interior of the top ring (709) is located on the outer wall of the first bevel gear (715) and is rotatably connected to a gear ring (716), a fourth motor (719) is installed inside the slide (708), an output end of the fourth motor (719) is connected to a connecting shaft (718), one end of the connecting shaft (718) is fixedly connected to a second bevel gear (717), and the second bevel gear (717) is in contact with the gear ring (716).

5. The water reducing agent packaging and transportation device according to claim 2, characterized in that: The two spur gears (604) are meshed with each other, and the outer wall of the rotating wheel (602) is in contact with the inner wall of the rotating belt (603).

6. The water reducing agent packaging and transportation device according to claim 2, characterized in that: The outer wall of the first threaded rod (609) is symmetrically provided with external threads, and the outer wall of the movable plate (607) is provided with a first threaded hole, and the first threaded hole matches the external threads.

7. The water reducing agent packaging and transportation device according to claim 4, characterized in that: The inner wall of the slide groove (706) is in contact with the outer wall of the slide plate (708).

8. The water reducing agent packaging and transportation device according to claim 4, characterized in that: The outer wall of the gear ring (716) is provided with gear teeth, the gear teeth are engaged with the second bevel gear (717), and the gear teeth are engaged with the first bevel gear (715).

9. The water reducing agent packaging and transportation device according to claim 4, characterized in that: A third threaded hole is provided on the outer wall of the positioning plate (713), and the third threaded hole matches the third threaded rod (714). The inner wall of the positioning groove (712) fits the outer wall of the positioning plate (713).

10. The water reducing agent packaging and transportation device according to claim 4, characterized in that: The inner wall of the displacement groove (702) fits with the outer wall of the displacement rod (703), and the outer wall of the displacement rod (703) is provided with a second threaded hole, and the second threaded hole matches the second threaded rod (705). The outer wall of the base (601) is located above the conveyor belt (5) and is fixedly connected to two limit rods (8).

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