Mineral sample treatment device for rock and ore identification

Abstract

The invention discloses a mineral sample treatment device for rock and ore identification, and relates to the technical field of rock and ore identification. According to the mineral sample treatment device for rock and ore identification, through the arrangement of a concave frame and a positioning frame, before a placed workpiece body is polished, a plurality of positioning sleeve rods and an inner sliding rod can be driven to move through the positioning frame until a positioning end head and a positioning ring piece which are mounted at the end part of the inner sliding rod are in contact with the workpiece body; the workpiece body positioning device is simple in structure and capable of completing positioning operation of a workpiece body, on one hand, the contact area with the workpiece body can be increased, the clamping stability of the workpiece body is guaranteed, meanwhile, the workpiece bodies of different shapes and different sizes can be clamped conveniently, the subsequent cutting and grinding effects are further improved, the using effect of the device is improved, and the application range of the device is widened.

Description

Technical Field

[0001] The invention relates to the technical field of rock and mineral identification, and in particular to a mineral sample processing device for rock and mineral identification. Background Art

[0002] Rock and mineral identification refers to the application of various mineralogical principles and methods to observe and identify rocks and mineral samples, including light (thin) sections, sand slices, debris, and powders to distinguish their mineral categories, as well as technical methods to study the main mineral composition, mineral formation sequence, structure, texture, and rock (ore) stone type of rocks and ores; rock and mineral samples usually need to be cut and polished during pretreatment. Referring to the Chinese patent, the announcement number is "CN219511923U" "A mineral sample processing device for rock and mineral identification", the patent points out that due to the irregular shape of the rock in the initial state, it is not easy to fix it during the slicing process, resulting in poor slicing effect, which in turn affects subsequent observation and identification; but the equipment still has the problems of poor operation convenience and low operating efficiency. In response to this, we propose a mineral sample processing device for rock and mineral identification to solve the above problems. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a mineral sample processing device for rock and mineral identification, which solves the problems raised in the above-mentioned background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A mineral sample processing device for rock and mineral identification, comprising a body, a concave frame is fixedly installed inside the body, a bearing plate is installed inside the concave frame, and the bearing plate is used to carry the workpiece body;

[0005] Mechanical arms are installed on both sides of the body, and grinding components are provided at the ends of the mechanical arms, and the grinding components are used to grind both sides of the workpiece body;

[0006] The concave frame is slidably connected to the two sides of the inner part of the concave frame, and a plurality of positioning sleeves are fixedly installed on the side of the positioning frame close to the workpiece body, and inner sliding rods are slidably installed inside the positioning sleeves, and support springs are fixedly installed inside the inner sliding rods;

[0007] The end of the inner slide rod located in the middle of the positioning frame is fixedly installed with a positioning end head, which is used to contact the workpiece body to achieve the fixing operation of the workpiece body. The ends of the inner slide rods located on both sides of the positioning frame are rotatably connected with positioning ring pieces. The positioning ring pieces are used to rotate along the corresponding inner slide rod when in contact with the workpiece body to achieve the positioning operation of the workpiece body.

[0008] Preferably, the positioning sleeves and positioning ends on both sides are symmetrical, and driving cylinders are fixedly installed on both sides of the outside of the concave frame. The piston end of the driving cylinder is fixedly connected to the middle of the positioning frame to drive the positioning frame to operate inside the concave frame.

[0009] Preferably, an electric telescopic rod is fixedly installed inside the concave frame, and the carrying plate is fixedly installed on the end of the electric telescopic rod.

[0010] Preferably, a plurality of rectangular notches are symmetrically provided on the top surface of the carrying plate, and a plurality of limiting protrusions are slidably mounted on the top surface of the carrying plate.

[0011] Preferably, a cutting assembly is provided inside the machine body, and the cutting assembly is used to cut the workpiece body. The cutting assembly includes a driving device, which is fixedly installed inside the machine body. A slitting frame is installed inside the driving device, and a driving shaft is rotatably installed at the end of the slitting frame. Cutting disks are sleeved on both ends of the driving shaft, and positioning bolts are provided inside the cutting disks for locking the cutting disks and the driving shaft.

[0012] Preferably, a driving motor is fixedly mounted on the outer side of the slitting frame, and a transmission belt is connected between the output end of the driving motor and the driving shaft.

[0013] Preferably, protective frames are fixedly installed on both sides of the slitting frame, and the ends of the protective frames are cylindrical and rotatably connected to the ends of the driving shaft.

[0014] Preferably, a window is fixedly installed inside the body, and a control panel is fixedly installed outside the body.

[0015] Preferably, both sides of the machine body are rotatably connected with feeding belts for conveying the workpiece body.

[0016] Preferably, a collecting plate is fixedly installed at the bottom inner side of the concave frame, and extraction racks are fixedly installed on both sides of the collecting plate for extracting dust generated during operation. A negative pressure device is installed inside the machine body, and connecting pipes are provided between the negative pressure device and the two extraction racks.

[0017] The present invention provides a mineral sample processing device for rock and mineral identification. Compared with the prior art, it has the following beneficial effects:

[0018] (1) The mineral sample processing device for rock and mineral identification, through the arrangement of a concave frame and a positioning frame, can drive multiple positioning sleeves and an inner slide rod to move through the positioning frame before grinding the placed workpiece body, until the positioning end and the positioning ring installed at the end of the inner slide rod contact the workpiece body, thereby completing the positioning operation of the workpiece body. On the one hand, it can increase the contact area with the workpiece body and ensure the clamping stability of the workpiece body. At the same time, it can facilitate the clamping of workpiece bodies of different shapes and sizes, further improving the subsequent cutting and grinding effects, and improving the use effect and application scope of the equipment.

[0019] (2) The mineral sample processing device for rock and mineral identification, through the setting of the cutting component, can adjust the distance between the two cutting discs according to the required size before grinding the placed workpiece body. Then, as the driving device is running, it can drive the running cutting disc to move, realize the cutting processing of the workpiece body, and improve the use effect and operation efficiency of the equipment.

[0020] (3) The mineral sample processing device for rock and mineral identification, through the setting of the collecting plate, when the equipment is performing cutting and grinding operations, the operation of the negative pressure device can generate negative pressure on the extraction frame inside the collecting plate, and the dust generated during the operation is extracted and processed to ensure the working environment. At the same time, through the setting of the collecting plate, the broken stones generated during the cutting process can be collected to ensure the convenience of equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the machine body of the present invention;

[0023] Figure 3 For the present invention Figure 2 Look at the structural diagram;

[0024] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0025] Figure 5 It is a schematic diagram of the structure of the driving device and the concave frame of the present invention;

[0026] Figure 6 It is a schematic cross-sectional view of the concave frame and the positioning frame of the present invention;

[0027] Figure 7 For this Figure 6 The schematic diagram of the structure is enlarged at B in the middle;

[0028] Figure 8 For the present invention Figure 6 Side view.

[0029] In the figure: 1. body; 101. window; 102. control panel; 2. feeding belt; 3. driving device; 4. driving motor; 5. slitting frame; 6. driving shaft; 7. cutting disc; 701. positioning bolt; 8. protective frame; 9. concave frame; 10. mechanical arm; 1001. grinding assembly; 11. carrying plate; 1101. limiting convex rod; 1102. rectangular notch; 1103. electric telescopic rod; 12. workpiece body; 13. positioning frame; 1301. positioning sleeve rod; 1302. inner slide rod; 1303. positioning end; 1304. positioning ring; 1305. supporting spring; 14. driving cylinder; 15. collecting plate; 1501. extraction frame. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 8 The present invention provides two technical solutions, which specifically include the following embodiments:

[0032] Embodiment 1:

[0033] In the embodiment of the present invention, reference Figure 1-Figure 8 A mineral sample processing device for rock and mineral identification includes a body 1, a concave frame 9 is fixedly installed inside the body 1, a carrying plate 11 is installed inside the concave frame 9, and the carrying plate 11 is used to carry a workpiece body 12. When processing a workpiece body 12 of different sizes and shapes, it is first placed on the carrying plate 11, and then polished;

[0034] In the embodiment of the present invention, a robot arm 10 is installed on both sides of the body 1, and a grinding assembly 1001 is provided at the end of the robot arm 10. The grinding assembly 1001 is used to grind both sides of the workpiece body 12. The robot arm 10 is an existing device and is controlled based on a PLC control module.

[0035] The grinding assembly 1001 is composed of a grinding sheet and a servo motor. The servo motor is used to drive the grinding sheet to rotate to achieve grinding operation on the surface of the workpiece body 12;

[0036] Specifically, a suction component is built into the end of the robot arm 10, which is used to grasp and transport the workpiece body 12 based on the existing negative pressure suction method;

[0037] Furthermore, positioning frames 13 are slidably connected to both sides of the concave frame 9, and a plurality of positioning sleeve rods 1301 are fixedly installed on one side of the positioning frame 13 close to the workpiece body 12, and inner slide rods 1302 are slidably installed inside the positioning sleeve rods 1301, and support springs 1305 are fixedly installed inside the inner slide rods 1302; positioning end heads 1303 are fixedly installed at the ends of the inner slide rods 1302 located in the middle of the positioning frame 13, and the positioning end heads 1303 are used to contact with the workpiece body 12 to achieve the fixing operation of the workpiece body 12, and the ends of the inner slide rods 1302 located on both sides of the positioning frame 13 are rotatably connected with positioning ring pieces 1304, and the positioning ring pieces 1304 are used to rotate along the corresponding inner slide rods 1302 when in contact with the workpiece body 12 to achieve the positioning operation of the workpiece body 12;

[0038] Specifically, when locking the irregular-shaped workpiece body 12, as the workpiece body 12 is placed on the carrier plate 11, and then moved toward the workpiece body 12 through the positioning frames 13 on both sides, multiple positioning sleeves 1301 and inner slide bars 1302 can be driven to move at the same time, until the positioning end 1303 and the positioning ring piece 1304 installed at the end of the inner slide bar 1302 contact the workpiece body 12, at this time, the inner slide bar 1302 can be forced to retract into the corresponding positioning sleeve bar 1301, squeezing the support spring 1305, and the positioning ring piece 1304 can contact with the workpiece body 12 and move along the corresponding inner slide bar 1302, until the inner slide bar 1302 located in the middle of the positioning frame 13 retracts into the positioning sleeve bar 1301 to the limit, thereby completing the positioning operation of the workpiece body 12;

[0039] Through the above positioning method, on the one hand, the contact area with the workpiece body 12 can be increased to ensure the clamping stability of the workpiece body 12, and at the same time, it can be convenient to clamp the workpiece body 12 of different shapes and sizes, further improving the subsequent cutting and grinding effects, and improving the use effect and application scope of the equipment;

[0040] Specifically, when clamping a rectangular workpiece body 12, the plurality of positioning ring pieces 1304 can drive the inner slide rod 1302 to retract into the positioning sleeve rod 1301 by contacting the side of the workpiece body 12, and can also complete the positioning operation of the workpiece body 12;

[0041] Specifically, the positioning sleeve rods 1301 and the positioning end heads 1303 on both sides are kept symmetrical, and the driving cylinders 14 are fixedly installed on both sides of the outside of the concave frame 9, and the piston end of the driving cylinder 14 is fixedly connected to the middle of the positioning frame 13, which is used to drive the positioning frame 13 to operate inside the concave frame 9. The driving cylinder 14 is an existing device and is used for driving operation;

[0042] Specifically, an electric telescopic rod 1103 is fixedly installed inside the concave frame 9, and the carrier plate 11 is fixedly installed at the end of the electric telescopic rod 1103. The electric telescopic rod 1103 is an existing device, which is used to drive the carrier plate 11 to slide up and down inside the concave frame 9 to adjust the height of the workpiece body 12;

[0043] Specifically, a plurality of rectangular notches 1102 are symmetrically provided on the top surface of the carrier plate 11, and a plurality of limiting convex rods 1101 are slidably installed on the top surface of the carrier plate 11. The rectangular notches 1102 facilitate the subsequent cutting operation of the workpiece body 12. Springs are installed between the ends of the limiting convex rods 1101 and the inside of the carrier plate 11. When the limiting convex rods 1101 are compressed, they can be retracted into the inside of the carrier plate 11 to squeeze the springs. By setting the limiting convex rods 1101, the workpiece body 12 can be limited, and the workpiece body 12 can be prevented from rolling down after being placed, thereby ensuring the clamping effect of the subsequent workpiece body 12.

[0044] Specifically, a control panel 102 is fixedly installed on the outside of the machine body 1, and the control panel 102 realizes control based on an existing PLC control module.

[0045] Embodiment 2: Based on Embodiment 1, refer to Figure 1-Figure 8 A mineral sample processing device for rock and mineral identification includes a body 1, a concave frame 9 is fixedly installed inside the body 1, a carrying plate 11 is installed inside the concave frame 9, and the carrying plate 11 is used to carry a workpiece body 12. When processing a workpiece body 12 of different sizes and shapes, it is first placed on the carrying plate 11, and then polished;

[0046] In the embodiment of the present invention, a robot arm 10 is installed on both sides of the body 1, and a grinding assembly 1001 is provided at the end of the robot arm 10. The grinding assembly 1001 is used to grind both sides of the workpiece body 12. The robot arm 10 is an existing device and is controlled based on a PLC control module.

[0047] The grinding assembly 1001 is composed of a grinding sheet and a servo motor. The servo motor is used to drive the grinding sheet to rotate to achieve grinding operation on the surface of the workpiece body 12;

[0048] Specifically, a suction component is built into the end of the robot arm 10, which is used to grasp and transport the workpiece body 12 based on the existing negative pressure suction method;

[0049] Furthermore, positioning frames 13 are slidably connected to both sides of the concave frame 9, and a plurality of positioning sleeve rods 1301 are fixedly installed on one side of the positioning frame 13 close to the workpiece body 12, and inner slide rods 1302 are slidably installed inside the positioning sleeve rods 1301, and support springs 1305 are fixedly installed inside the inner slide rods 1302; positioning end heads 1303 are fixedly installed at the ends of the inner slide rods 1302 located in the middle of the positioning frame 13, and the positioning end heads 1303 are used to contact with the workpiece body 12 to achieve the fixing operation of the workpiece body 12, and the ends of the inner slide rods 1302 located on both sides of the positioning frame 13 are rotatably connected with positioning ring pieces 1304, and the positioning ring pieces 1304 are used to rotate along the corresponding inner slide rods 1302 when in contact with the workpiece body 12 to achieve the positioning operation of the workpiece body 12;

[0050] Specifically, when locking the irregular-shaped workpiece body 12, as the workpiece body 12 is placed on the carrier plate 11, and then moved toward the workpiece body 12 through the positioning frames 13 on both sides, multiple positioning sleeves 1301 and inner slide bars 1302 can be driven to move at the same time, until the positioning end 1303 and the positioning ring piece 1304 installed at the end of the inner slide bar 1302 contact the workpiece body 12, at this time, the inner slide bar 1302 can be forced to retract into the corresponding positioning sleeve bar 1301, squeezing the support spring 1305, and the positioning ring piece 1304 can contact with the workpiece body 12 and move along the corresponding inner slide bar 1302, until the inner slide bar 1302 located in the middle of the positioning frame 13 retracts into the positioning sleeve bar 1301 to the limit, thereby completing the positioning operation of the workpiece body 12;

[0051] Through the above positioning method, on the one hand, the contact area with the workpiece body 12 can be increased to ensure the clamping stability of the workpiece body 12, and at the same time, it can be convenient to clamp the workpiece body 12 of different shapes and sizes, further improving the subsequent cutting and grinding effects, and improving the use effect and application scope of the equipment;

[0052] Specifically, when clamping a rectangular workpiece body 12, the plurality of positioning ring pieces 1304 can drive the inner slide rod 1302 to retract into the positioning sleeve rod 1301 by contacting the side of the workpiece body 12, and can also complete the positioning operation of the workpiece body 12;

[0053] Specifically, the positioning sleeve rods 1301 and the positioning end heads 1303 on both sides are kept symmetrical, and the driving cylinders 14 are fixedly installed on both sides of the outside of the concave frame 9, and the piston end of the driving cylinder 14 is fixedly connected to the middle of the positioning frame 13, which is used to drive the positioning frame 13 to operate inside the concave frame 9. The driving cylinder 14 is an existing device and is used for driving operation;

[0054] Specifically, an electric telescopic rod 1103 is fixedly installed inside the concave frame 9, and the carrier plate 11 is fixedly installed at the end of the electric telescopic rod 1103. The electric telescopic rod 1103 is an existing device, which is used to drive the carrier plate 11 to slide up and down inside the concave frame 9 to adjust the height of the workpiece body 12;

[0055] Specifically, a plurality of rectangular notches 1102 are symmetrically provided on the top surface of the carrier plate 11, and a plurality of limiting convex rods 1101 are slidably installed on the top surface of the carrier plate 11. The rectangular notches 1102 facilitate the subsequent cutting operation of the workpiece body 12. Springs are installed between the ends of the limiting convex rods 1101 and the inside of the carrier plate 11. When the limiting convex rods 1101 are compressed, they can be retracted into the inside of the carrier plate 11 to squeeze the springs. By setting the limiting convex rods 1101, the workpiece body 12 can be limited, and the workpiece body 12 can be prevented from rolling down after being placed, thereby ensuring the clamping effect of the subsequent workpiece body 12.

[0056] Furthermore, a cutting assembly is provided inside the machine body 1, and the cutting assembly is used to cut the workpiece body 12. The cutting assembly includes a driving device 3, and the driving device 3 is fixedly installed inside the machine body 1. A slitting frame 5 is installed inside the driving device 3, and a driving shaft 6 is rotatably installed at the end of the slitting frame 5. Both ends of the driving shaft 6 are sleeved with cutting discs 7, and the inside of the cutting disc 7 is provided with positioning bolts 701 for locking the cutting disc 7 and the driving shaft 6. Through the setting of the driving shaft 6, the distance between the two cutting discs 7 can be easily adjusted, so that the workpiece body 12 of different sizes can be cut into sheets of different thicknesses, which improves the use effect of the equipment and the operating efficiency of the equipment at the same time.

[0057] Specifically, the driving device 3 is composed of a plurality of cylinders, which are used to drive the slitting frame 5 to move up and down and left and right inside the machine body 1, which will not be described in detail here;

[0058] Specifically, a driving motor 4 is fixedly installed on the outer side of the slitting frame 5, and a transmission belt is connected between the output end of the driving motor 4 and the driving shaft 6;

[0059] Specifically, protective frames 8 are fixedly installed on both sides of the slitting frame 5. The ends of the protective frames 8 are cylindrical and rotatably connected to the ends of the driving shaft 6. The setting of the protective frames 8 can ensure cutting stability and improve operation safety.

[0060] Specifically, a window 101 is fixedly installed inside the body 1, and a control panel 102 is fixedly installed outside the body 1. The control panel 102 realizes control based on an existing PLC control module;

[0061] Specifically, both sides of the machine body 1 are rotatably connected with a feeding belt 2 for conveying the workpiece body 12, and the feeding belt 2 is driven by a separate motor;

[0062] Furthermore, a collecting tray 15 is fixedly installed at the bottom of the inner side of the concave frame 9, and extraction racks 1501 are fixedly installed on both sides of the collecting tray 15 for extracting the dust generated during the operation. A negative pressure device is installed inside the machine body 1, and connecting pipes are provided between the negative pressure device and the two extraction racks 1501;

[0063] Specifically, the negative pressure device is an existing device, which is used when the equipment is performing cutting and grinding operations. The operation of the negative pressure device can generate negative pressure in the extraction frame 1501 inside the collection tray 15, and the dust generated during the operation is extracted and processed to ensure the working environment. At the same time, through the setting of the collection tray 15, the gravel generated during the cutting process can be collected to ensure the convenience of equipment maintenance.

[0064] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0065] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A mineral sample processing device for rock and mineral identification, comprising a body (1), characterized in that: A concave frame (9) is fixedly installed inside the machine body (1), a carrying plate (11) is installed inside the concave frame (9), and the carrying plate (11) is used to carry the workpiece body (12); Mechanical arms (10) are installed on both sides of the machine body (1), and grinding components (1001) are provided at the ends of the mechanical arms (10), and the grinding components (1001) are used to grind both sides of the workpiece body (12); The concave frame (9) is slidably connected to positioning frames (13) on both sides thereof, a plurality of positioning sleeves (1301) are fixedly installed on one side of the positioning frame (13) close to the workpiece body (12), inner slide bars (1302) are slidably installed inside the positioning sleeves (1301), and support springs (1305) are fixedly installed inside the inner slide bars (1302); A positioning end head (1303) is fixedly installed at the end of the inner slide rod (1302) located in the middle of the positioning frame (13), and the positioning end head (1303) is used to contact the workpiece body (12) to achieve the fixing operation of the workpiece body (12). The ends of the inner slide rods (1302) located on both sides of the positioning frame (13) are rotatably connected with positioning ring pieces (1304). The positioning ring pieces (1304) are used to rotate along the corresponding inner slide rod (1302) when contacting the workpiece body (12) to achieve the positioning operation of the workpiece body (12).

2. The mineral sample processing device for rock and mineral identification according to claim 1, characterized in that: The positioning sleeve rods (1301) and the positioning ends (1303) on both sides are kept symmetrical, and driving cylinder bodies (14) are fixedly installed on both sides of the outside of the concave frame (9), and the piston ends of the driving cylinder bodies (14) are fixedly connected to the middle part of the positioning frame (13) to drive the positioning frame (13) to operate inside the concave frame (9).

3. The mineral sample processing device for rock and mineral identification according to claim 1, characterized in that: An electric telescopic rod (1103) is fixedly installed inside the concave frame (9), and the carrying plate (11) is fixedly installed on the end of the electric telescopic rod (1103).

4. The mineral sample processing device for rock and mineral identification according to claim 3 is characterized in that: The top surface of the carrier plate (11) is symmetrically provided with a plurality of rectangular notches (1102), and the top surface of the carrier plate (11) is slidably provided with a plurality of limiting protruding rods (1101).

5. The mineral sample processing device for rock and mineral identification according to claim 1, characterized in that: A cutting assembly is provided inside the machine body (1), and the cutting assembly is used to cut the workpiece body (12). The cutting assembly comprises a driving device (3), and the driving device (3) is fixedly mounted inside the machine body (1). A slitting frame (5) is installed inside the driving device (3), and a driving shaft (6) is rotatably mounted at the end of the slitting frame (5). Both ends of the driving shaft (6) are sleeved with cutting discs (7), and positioning bolts (701) are provided inside the cutting disc (7) for locking the cutting disc (7) and the driving shaft (6).

6. The mineral sample processing device for rock and mineral identification according to claim 5, characterized in that: A driving motor (4) is fixedly mounted on the outer side of the slitting frame (5), and a transmission belt is connected between the output end of the driving motor (4) and the driving shaft (6).

7. The mineral sample processing device for rock and mineral identification according to claim 5, characterized in that: Protective frames (8) are fixedly mounted on both sides of the slitting frame (5); the ends of the protective frames (8) are cylindrical and rotatably connected to the ends of the driving shaft (6).

8. The mineral sample processing device for rock and mineral identification according to claim 1, characterized in that: A window (101) is fixedly mounted inside the machine body (1), and a control panel (102) is fixedly mounted outside the machine body (1).

9. The mineral sample processing device for rock and mineral identification according to claim 1, characterized in that: Both sides of the machine body (1) are rotatably connected with feeding belts (2) for conveying the workpiece body (12).

10. The mineral sample processing device for rock and mineral identification according to claim 1, characterized in that: A collecting tray (15) is fixedly mounted on the bottom of the inner side of the concave frame (9), and extraction racks (1501) are fixedly mounted on both sides of the collecting tray (15) for extracting dust generated during operation. A negative pressure device is installed inside the machine body (1), and connecting pipes are provided between the negative pressure device and the two extraction racks (1501).

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