Injection molding machine take-off device

Abstract

The utility model provides a kind of injection molding machine material taking device, including bottom plate, elevating stand, mounting seat, telescopic stand, three-axis drive mechanism, three-axis guide component, vacuum material taking disc and angle adjusting mechanism. Bottom plate is bearing base, elevating stand, mounting seat, telescopic stand are sequentially assembled, three-axis drive mechanism respectively drives each component to move along three directions perpendicular to each other, and guide component guarantees movement precision. Vacuum material taking disc is located in telescopic stand side, and multiple material taking heads are equipped on disc and are connected with vacuum generator;Angle adjusting mechanism is installed on telescopic stand, and the inclination angle of vacuum material taking disc is adjusted. The device can adapt to the narrow space of injection molding machine, realize the accurate taking and placing of parts, adapt to injection molding parts of different sizes and shapes, and improve the taking efficiency and stability.

Description

Technical Field

[0001] This utility model relates to the technical field of material handling devices, specifically a material handling device for an injection molding machine. Background Technology

[0002] Currently, in injection molding machine production, the material handling process largely relies on traditional equipment or simple methods, which have significant technical limitations. While mainstream robotic material handling systems, such as those using four-axis or six-axis robots from brands like ABB and KUKA, can automate material handling, these devices generally occupy a large area, especially six-axis models, making them difficult to deploy flexibly in compact injection molding workshops. Furthermore, the overall system cost is high; the purchase and maintenance costs of imported equipment are unaffordable for many small and medium-sized enterprises. Additionally, the need for professional programming and debugging, coupled with significant differences in programming logic between different brands, further increases the operational threshold and limits their widespread application.

[0003] Traditional three-axis or five-axis robotic gripper mechanisms also have shortcomings. These mechanisms are usually installed above the injection molding machine, resulting in a large overall size that occupies a significant amount of vertical space. This not only affects daily mold maintenance but also prolongs mold changeover time and reduces production continuity. Their grippers are mostly fixed designs, requiring manual gripper replacement for different injection molded parts, such as relays and thin-walled parts. This is cumbersome and lacks adaptability. More importantly, rigid gripping methods can easily lead to deformation of thin-walled parts, damage to powder metallurgy preforms, or scratches on the part surface, increasing the product defect rate. Furthermore, some simple gripping methods, such as gravity-fed unloading, are prone to collisions when parts fall freely, causing cracks or scratches. Simple vacuum suction cups are sensitive to environmental dust, and impurities can easily cause adsorption failure, making them unsuitable for complex production conditions and unable to meet the demands of high-quality, high-efficiency injection molding production. Utility Model Content

[0004] To address the aforementioned technical shortcomings, the purpose of this utility model is to provide a material handling device for injection molding machines, enabling precise handling of parts and adapting to injection molded parts of different sizes and shapes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A material handling device for an injection molding machine, comprising:

[0007] The base plate serves as the core load-bearing component;

[0008] The lifting frame is set at parallel intervals above the base plate;

[0009] Mounting bases are arranged parallel to each other above the lifting frame;

[0010] The telescopic frame is mounted on the mounting base.

[0011] The first drive mechanism is mounted on the base plate and connected at one end to the lifting frame; the first drive mechanism is used to drive the lifting frame to move in the first direction;

[0012] The first guide component is installed between the base plate and the lifting frame, and its orientation is parallel to the first direction.

[0013] The second drive mechanism is mounted on the lifting frame, with one end connected to the mounting base; the second drive mechanism is used to drive the mounting base to move in the second direction.

[0014] The second guide component is installed between the lifting frame and the mounting base, and its orientation is parallel to the second direction.

[0015] The third drive mechanism is mounted on the mounting base and connected at one end to the telescopic frame; the third drive mechanism is used to drive the telescopic frame to move in a third direction.

[0016] The third guide component is installed between the mounting base and the telescopic frame, and its orientation is parallel to the third direction; the first direction, the second direction, and the third direction are perpendicular to each other.

[0017] A vacuum feeding tray is located on one side of the telescopic frame; the vacuum feeding tray is equipped with multiple feeding heads, which are connected to the vacuum generator;

[0018] An angle adjustment mechanism is installed on the telescopic frame, with one end connected to the vacuum feeding disc; the angle adjustment mechanism is used to adjust the tilt angle of the vacuum feeding disc.

[0019] Preferably, the first driving mechanism is an electric cylinder; the base plate is provided with a mounting hole, and a support frame is provided on the side of the mounting hole, and the support frame is fixedly connected to the base plate; the lower end of the electric cylinder is fixed on the support frame, and the upper end passes through the mounting hole and is fixed on the lifting frame.

[0020] Preferably, multiple first guide components are provided; the multiple first guide components are arranged in parallel intervals; each first guide component includes a Z-axis slider and a Z-axis slide rail; the Z-axis slide rail is fixed on the lifting frame; the Z-axis slider is fixed on the base plate; the Z-axis slider is slidably mounted on the Z-axis slide rail.

[0021] Preferably, the second drive mechanism is an electric slide table.

[0022] Preferably, there are two second guide components; the two second guide components are symmetrically arranged on both sides of the second drive mechanism; the second guide components are a Y-axis slider and a Y-axis slide rail; the Y-axis slide rail is fixed on the lifting frame; the Y-axis slider is fixed on the mounting base; the Y-axis slider is slidably mounted on the Y-axis slide rail.

[0023] Preferably, two third guide components are configured, symmetrically arranged on the upper and lower sides of the telescopic frame; each third guide component includes an X-axis slide rail and an X-axis slider; the X-axis slide rail is fixed on the telescopic frame, and the X-axis slider is fixed on the mounting base; the X-axis slider is slidably mounted on the X-axis slide rail; the third drive mechanism includes a first motor, a first driving pulley, a first driven pulley, a first synchronous toothed belt, and a connecting plate; the first motor is fixed on the mounting base; the first driving pulley is mounted on the output shaft of the first motor; the first driven pulley is rotatably mounted on the mounting base; the first driving pulley and the first driven pulley are connected by a first synchronous toothed belt; one end of the connecting plate is fixed on the first synchronous toothed belt, and the other end is fixed on the telescopic frame.

[0024] Preferably, the angle adjustment mechanism includes a second motor, a second driving pulley, a second driven pulley, a second synchronous toothed belt, and a rotating shaft; the second motor is fixed on the telescopic frame; the rotating shaft is rotatably mounted on the telescopic frame; the vacuum material handling disc is fixed at one end of the rotating shaft; the second driving pulley is mounted on the output shaft of the second motor; the second driven pulley is mounted on the rotating shaft; the second driving pulley and the second driven pulley are connected by a second synchronous toothed belt.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] With its streamlined three-axis assembly structure and compact layout, it can flexibly adapt to the narrow space of the injection molding machine's material handling area, avoid interference with the injection molding equipment during the material handling process, and does not require too much installation space, making it suitable for injection molding workshops with different layouts.

[0027] Employing a vacuum adsorption method combined with a multi-head design, it can stably grip various injection molded parts, avoiding problems such as part deformation and scratches caused by traditional rigid clamping. At the same time, the vacuum adsorption force is controllable, adapting to the handling needs of fragile parts such as thin-walled parts and irregularly shaped parts.

[0028] The angle adjustment mechanism can flexibly adjust the tilt angle of the vacuum feeding tray according to the shape of the part and the picking and placing requirements. It can adapt to injection molded parts of different specifications and shapes without changing the picking parts, reducing the complexity of operation and improving the adaptability of the equipment.

[0029] With a streamlined overall structure and no complex imported core components, the maintenance process is simple and daily operation can be completed without professional programmers. The equipment purchase and maintenance costs are lower than those of traditional robotic material handling systems, making it more acceptable to small and medium-sized enterprises.

[0030] Through the coordinated movement of the three-axis drive mechanism, efficient connection of material picking, transfer and unloading can be achieved. The multi-head design supports batch picking, which greatly shortens the picking cycle and improves the overall efficiency of injection molding production compared with the traditional single picking method. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0033] in:

[0034] 1. Support frame; 2. Electric cylinder; 3. Base plate; 4. Z-axis slide rail; 5. Z-axis slider; 6. Electric slide table; 7. Mounting base; 8. Telescopic frame; 9. Material handling head; 10. Vacuum material handling plate; 11. Rotary shaft; 12. Y-axis slide rail; 13. Y-axis slider; 14. Lifting frame; 15. First driven pulley; 16. X-axis slide rail; 17. Connecting plate; 18. First synchronous toothed belt; 19. Second synchronous toothed belt; 20. First driving pulley; 21. First motor; 22. Second motor; 23. Second driving pulley; 24. Second driven pulley. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] like Figure 1 , Figure 2 As shown, a material handling device for an injection molding machine includes:

[0037] Base plate 3 serves as the core load-bearing component;

[0038] The lifting frame 14 is arranged parallel to each other above the base plate 3;

[0039] Mounting base 7 is arranged parallel to each other above lifting frame 14;

[0040] The telescopic frame 8 is mounted on the mounting base 7;

[0041] The first drive mechanism is mounted on the base plate 3 and one end is connected to the lifting frame 14; the first drive mechanism is used to drive the lifting frame 14 to move in the first direction.

[0042] The first guide component is installed between the base plate 3 and the lifting frame 14, and its orientation is parallel to the first direction.

[0043] The second drive mechanism is mounted on the lifting frame 14, and one end is connected to the mounting base 7; the second drive mechanism is used to drive the mounting base 7 to move in the second direction.

[0044] The second guide component is installed between the lifting frame 14 and the mounting base 7, and its orientation is parallel to the second direction.

[0045] The third drive mechanism is mounted on the mounting base 7, and one end is connected to the telescopic frame 8; the third drive mechanism is used to drive the telescopic frame 8 to move in the third direction.

[0046] The third guide component is installed between the mounting base 7 and the telescopic frame 8, and its orientation is parallel to the third direction; the first direction, the second direction and the third direction are perpendicular to each other.

[0047] A vacuum feeding tray 10 is set on one side of the telescopic frame 8; the vacuum feeding tray 10 is provided with multiple feeding heads 9, and the feeding heads 9 are connected to the vacuum generator;

[0048] An angle adjustment mechanism is installed on the telescopic frame 8, with one end connected to the vacuum material handling plate 10; the angle adjustment mechanism is used to adjust the tilt angle of the vacuum material handling plate 10.

[0049] First direction, second direction and third direction, such as Figure 1 As shown. The vacuum pick-up disk 10 on the telescopic frame 8 is driven by the first drive mechanism, the second drive mechanism, and the third drive mechanism to move in the three directions of Z-axis, Y-axis, and X-axis, and the vacuum pick-up disk 10 picks up the workpiece. The tilt direction of the vacuum pick-up disk 10 is adjusted by the angle adjustment mechanism to facilitate the picking up and putting down of the workpiece.

[0050] The material handling head 9 on the vacuum material handling plate 10 corresponds to the cavity of the shell mold equipment.

[0051] In this embodiment, the first driving mechanism is an electric cylinder 2; the base plate 3 is provided with a mounting hole, and a support frame 1 is provided on the side of the mounting hole, and the support frame 1 is fixedly connected to the base plate 3; the lower end of the electric cylinder 2 is fixed on the support frame 1, and the upper end passes through the mounting hole and is fixed on the lifting frame 14.

[0052] In this embodiment, multiple first guide components are configured; the multiple first guide components are arranged in parallel at intervals; the first guide component includes a Z-axis slider 5 and a Z-axis slide rail 4; the Z-axis slide rail 4 is fixed on the lifting frame 14; the Z-axis slider 5 is fixed on the base plate 3; the Z-axis slider 5 is slidably mounted on the Z-axis slide rail 4.

[0053] In this embodiment, the second drive mechanism is an electric slide table 6.

[0054] In this embodiment, two second guide components are configured; the two second guide components are symmetrically arranged on both sides of the second drive mechanism; the second guide components are Y-axis slider 13 and Y-axis slide rail 12; the Y-axis slide rail 12 is fixed on the lifting frame 14; the Y-axis slider 13 is fixed on the mounting base 7; the Y-axis slider 13 is slidably mounted on the Y-axis slide rail 12.

[0055] In this embodiment, two third guide components are configured, symmetrically arranged on the upper and lower sides of the telescopic frame 8. The third guide component includes an X-axis slide rail 16 and an X-axis slider. The X-axis slide rail 16 is fixed on the telescopic frame 8, and the X-axis slider is fixed on the mounting base 7. The X-axis slider is slidably mounted on the X-axis slide rail 16. The third drive mechanism includes a first motor 21, a first driving pulley 20, a first driven pulley 15, a first synchronous toothed belt 18, and a connecting plate 17. The first motor 21 is fixed on the mounting base 7. The first driving pulley 20 is mounted on the output shaft of the first motor 21. The first driven pulley 15 is rotatably mounted on the mounting base 7. The first driving pulley 20 and the first driven pulley 15 are connected by the first synchronous toothed belt 18. One end of the connecting plate 17 is fixed on the first synchronous toothed belt 18, and the other end is fixed on the telescopic frame 8.

[0056] In this embodiment, the angle adjustment mechanism includes a second motor 22, a second driving pulley 23, a second driven pulley 24, a second synchronous toothed belt 19, and a rotating shaft 11; the second motor 22 is fixed on the telescopic frame 8; the rotating shaft 11 is rotatably mounted on the telescopic frame 8; the vacuum material handling disc 10 is fixed to one end of the rotating shaft 11; the second driving pulley 23 is mounted on the output shaft of the second motor 22; the second driven pulley 24 is mounted on the rotating shaft 11; the second driving pulley 23 and the second driven pulley 24 are connected by the second synchronous toothed belt 19. Specific Implementation Example 1

[0058] The injection molding machine material handling device of this embodiment is suitable for handling injection molded parts with dimensions ≤100mm, such as mobile phone cases and small relays. The entire device is mounted on a bracket on the side of the injection molding machine. The base plate is made of Q235 steel plate, with a length of 400mm, a width of 300mm, and a thickness of 20mm. Four mounting holes are opened on the base plate, and the support frame on the side of the mounting holes is fixed to the base plate by welding. The support frame is made of channel steel.

[0059] The first drive mechanism uses an EC60 electric cylinder. The lower end of the electric cylinder is fixed to the support frame with bolts, and the upper end passes through the mounting hole and is welded to the lifting frame. Four first guide components are arranged in a rectangle around the electric cylinder. The Z-axis slide rail of each first guide component is fixed to the bottom of the lifting frame with screws, and the Z-axis slider is fixed to the base plate with screws. The Z-axis slider and the Z-axis slide rail are fitted with clearance to achieve sliding guidance.

[0060] The lifting frame is constructed from aluminum alloy profiles, measuring 350mm in length, 280mm in width, and 50mm in height. The second drive mechanism utilizes an ST-M10 electric slide table, which is bolted to the upper surface of the lifting frame. Two second guide components are symmetrically distributed on either side of the electric slide table. The Y-axis slide rail is fixed to the lifting frame with screws, and the Y-axis slider is fixed to the bottom of the mounting base with screws, allowing the Y-axis slider to slide smoothly along the Y-axis slide rail.

[0061] The mounting base is made of forged aluminum alloy, with a length of 320mm, a width of 250mm, and a thickness of 15mm. Two third guide components are fixed to the upper and lower sides of the telescopic frame, respectively. The X-axis slide rail is fixed to the side of the telescopic frame with screws, and the X-axis slider is fixed to the mounting base with screws, with the X-axis slider slidingly engaging with the X-axis slide rail. The first motor of the third drive mechanism is a 57HS22 stepper motor, fixed to one end of the mounting base. The first driving pulley is mounted on the output shaft of the first motor, and the first driven pulley is mounted on the other end of the mounting base via a bearing housing. The first synchronous toothed belt is sleeved on the driving and driven pulleys. One end of the connecting plate is fixed to the synchronous toothed belt with bolts, and the other end is welded to the telescopic frame.

[0062] The telescopic frame is made of carbon fiber, with a length of 200mm, a width of 220mm, and a thickness of 8mm. The second motor of the angle adjustment mechanism is a 42HS14 stepper motor, fixed to the side of the telescopic frame. The rotating shaft is mounted at the end of the telescopic frame via bearings, and the vacuum material handling disc is fixed to one end of the rotating shaft via a flange. The second driving pulley is mounted on the output shaft of the second motor, and the second driven pulley is mounted in the middle of the rotating shaft. A second synchronous toothed belt connects the two pulleys to achieve power transmission.

[0063] The vacuum material handling tray is circular with a diameter of 150mm. Twelve material handling heads, each 8mm in diameter, are evenly distributed on the tray surface and connected to a ZV20 vacuum generator via air pipes. During operation, the first drive mechanism adjusts the height of the lifting frame along the Z-axis to align the vacuum material handling tray with the injection mold outlet. The second drive mechanism moves the mounting base along the Y-axis, bringing the vacuum material handling tray closer to the mold. The third drive mechanism extends the telescopic frame along the X-axis, aligning the material handling heads with the mold cavity. The vacuum generator activates, creating negative pressure, and the material handling heads adsorb the parts. Subsequently, the drive mechanisms move in opposite directions, transferring the parts to the designated position. The angle adjustment mechanism rotates the vacuum material handling tray 30°, the vacuum generator depressurizes, and the parts are placed stably. Specific Implementation Example 2

[0065] The injection molding machine material handling device of this embodiment is suitable for handling irregularly shaped injection molded parts with dimensions of 200-500mm, such as automotive interior parts and large household appliance shells. The base plate is made of Q345 steel plate, with a length of 600mm, a width of 450mm, and a thickness of 25mm. The base plate is fixed to the ground foundation with expansion bolts. The support frame on the side of the mounting hole is a welded steel structure to enhance the load-bearing capacity.

[0066] The first drive mechanism uses an EC80 electric cylinder with a rated thrust of 5000N. The lower end of the electric cylinder is fixed to the support frame, and the upper end is connected to the lifting frame via a coupling. Six first guide components are evenly distributed around the electric cylinder. The Z-axis slide rail is fixed to the bottom of the lifting frame, and the Z-axis slider is fixed to the base plate. Multi-point guidance improves the stability of the lifting frame's movement.

[0067] The lifting frame is constructed from welded square tubing, measuring 550mm in length, 400mm in width, and 70mm in height. The second drive mechanism is replaced with a 130 servo motor paired with a ball screw. The servo motor is fixed to one end of the lifting frame, and the ball screw is mounted on the lifting frame via a bearing housing. The nut housing is fixed to the bottom of the mounting base. Two second guide components are symmetrically distributed on both sides of the ball screw. The Y-axis slide rail is fixed to the lifting frame, and the Y-axis slider is fixed to the bottom of the mounting base, ensuring precise movement of the mounting base along the Y-axis.

[0068] The mounting base is made of cast iron, with a length of 500mm, a width of 380mm, and a thickness of 20mm. Two third guide components are installed on the upper and lower edges of the telescopic frame, respectively. The X-axis slide rail is fixed to the telescopic frame, and the X-axis slider is fixed to the side of the mounting base, with the sliding clearance controlled within 0.02mm. The first motor of the third drive mechanism is an 86HS35 stepper motor with a power of 1.2kW. The driving and driven pulleys are synchronous pulleys, and the synchronous toothed belt is made of polyurethane. The connecting plate is doubly fixed to the synchronous toothed belt and the telescopic frame by bolts.

[0069] The telescopic frame is constructed from aluminum alloy profiles, measuring 350mm in length, 350mm in width, and 12mm in thickness. The second motor of the angle adjustment mechanism is a 57HS34 stepper motor equipped with a reducer to increase torque. The rotating shaft is made of stainless steel and mounted on the telescopic frame via double bearings. The vacuum material handling disc is bolted to the end of the rotating shaft. The second driving pulley, the second driven pulley, and the synchronous toothed belt work together to achieve angle adjustment of the vacuum material handling disc within the range of 0-90°.

[0070] The vacuum pick-up tray has a rectangular structure, 300mm in length and 250mm in width. Eight pick-up heads, each 15mm in diameter, are distributed on the tray according to the contour of the irregularly shaped part. Each head is equipped with a silicone suction cup to prevent scratching. All pick-up heads are connected to a ZV40 vacuum generator via branch air pipes. The vacuum generator is equipped with a pressure sensor to monitor the adsorption pressure in real time. During operation, the first drive mechanism drives the lifting frame to move up and down along the Z-axis to adapt to injection molds of different heights; the second drive mechanism drives the mounting base to move along the Y-axis to adjust the front and rear position of the pick-up head; the third drive mechanism drives the telescopic frame to extend and retract along the X-axis, allowing the pick-up head to conform to the surface of the irregularly shaped part; the angle adjustment mechanism adjusts the tilt angle of the vacuum pick-up tray according to the part shape to ensure uniform force on all pick-up heads; the vacuum generator starts to generate a stable negative pressure. After the pick-up heads adsorb the part, the drive mechanisms work together to move the part to the unloading platform. The angle adjustment mechanism adjusts the part's posture, and after depressurization, the pick-up is complete.

Claims

1. A material handling device for an injection molding machine, characterized in that, include: The base plate serves as the core load-bearing component; The lifting frame is set at parallel intervals above the base plate; Mounting bases are arranged parallel to each other above the lifting frame; The telescopic frame is mounted on the mounting base. The first drive mechanism is mounted on the base plate and connected at one end to the lifting frame; the first drive mechanism is used to drive the lifting frame to move in the first direction; The first guide component is installed between the base plate and the lifting frame, and its orientation is parallel to the first direction. The second drive mechanism is installed on the lifting frame, with one end connected to the mounting base; The second drive mechanism is used to drive the mounting base to move in the second direction; The second guide component is installed between the lifting frame and the mounting base, and its orientation is parallel to the second direction. The third drive mechanism is mounted on the mounting base and connected at one end to the telescopic frame; the third drive mechanism is used to drive the telescopic frame to move in a third direction. The third guide component is installed between the mounting base and the telescopic frame, and its orientation is parallel to the third direction; the first direction, the second direction, and the third direction are perpendicular to each other. A vacuum feeding tray is located on one side of the telescopic frame; the vacuum feeding tray is equipped with multiple feeding heads, which are connected to the vacuum generator; An angle adjustment mechanism is installed on the telescopic frame, with one end connected to the vacuum feeding disc; the angle adjustment mechanism is used to adjust the tilt angle of the vacuum feeding disc.

2. The injection molding machine material handling device as described in claim 1, characterized in that, The first driving mechanism is an electric cylinder; a mounting hole is provided on the base plate, and a support frame is provided on the side of the mounting hole, which is fixedly connected to the base plate; the lower end of the electric cylinder is fixed on the support frame, and the upper end passes through the mounting hole and is fixed on the lifting frame.

3. The injection molding machine material handling device as described in claim 1, characterized in that, Multiple first guide components are configured; the multiple first guide components are arranged in parallel intervals; each first guide component includes a Z-axis slider and a Z-axis slide rail; the Z-axis slide rail is fixed on the lifting frame; The Z-axis slider is fixed on the base plate; The Z-axis slider is slidably mounted on the Z-axis slide rail.

4. The injection molding machine material handling device as described in claim 1, characterized in that, The second drive mechanism is an electric slide table.

5. The injection molding machine material handling device as described in claim 1, characterized in that, There are two second guide components; the two second guide components are symmetrically arranged on both sides of the second drive mechanism; the second guide component is a Y-axis slider and a Y-axis slide rail; the Y-axis slide rail is fixed on the lifting frame; The Y-axis slider is fixed on the mounting base; The Y-axis slider is slidably mounted on the Y-axis slide rail.

6. The injection molding machine material handling device as described in claim 1, characterized in that, Two third guide components are configured, symmetrically arranged on the upper and lower sides of the telescopic frame. Each third guide component includes an X-axis slide rail and an X-axis slider. The X-axis slide rail is fixed to the telescopic frame, and the X-axis slider is fixed to the mounting base. The X-axis slider is slidably mounted on the X-axis slide rail. The third drive mechanism includes a first motor, a first driving pulley, a first driven pulley, a first synchronous toothed belt, and a connecting plate. The first motor is fixed to the mounting base. The first driving pulley is mounted on the output shaft of the first motor. The first driven pulley is rotatably mounted on the mounting base. The first driving pulley and the first driven pulley are connected by a first synchronous toothed belt. One end of the connecting plate is fixed to the first synchronous toothed belt, and the other end is fixed to the telescopic frame.

7. The injection molding machine material handling device as described in any one of claims 1 to 6, characterized in that, The angle adjustment mechanism includes a second motor, a second driving pulley, a second driven pulley, a second synchronous toothed belt, and a rotating shaft; the second motor is fixed on the telescopic frame; the rotating shaft is rotatably mounted on the telescopic frame; the vacuum material handling disc is fixed at one end of the rotating shaft; the second driving pulley is mounted on the output shaft of the second motor; the second driven pulley is mounted on the rotating shaft; the second driving pulley and the second driven pulley are connected by a second synchronous toothed belt.

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