Bolt Cleaning Machine

Abstract

A bolt cleaning machine comprises: a base (1), a feeding belt (2), a roller brush (3), and a driving member (5), wherein the feeding belt (2) is movably arranged on the top wall of the base (1), the feeding belt (2) comprises a plurality of feeding rollers (21) arranged side by side in a moving direction and parallel to the top wall of the base (1), and a mounting groove (20) for placing bolts thereon is formed between two adjacent feeding rollers (21); the roller brush (3) is rotatably arranged above the feeding belt (2) and is used to brush the bolts placed on the mounting groove (20), and the rotating shaft of the roller brush (3) is substantially parallel to the feeding roller (21) and extends along the axial direction of the feeding roller (21); the output end of the driving member (5) acts on the feeding belt (2) to drive the feeding belt (2) to move. Compared with the prior art, the present application can clean a plurality of bolts, especially bolts with highly bonded attachments on the surface.

Description

Technical Field

[0001] The invention belongs to the technical field of cleaning equipment, and in particular relates to a bolt cleaning machine. Background Art

[0002] During the shutdown and overhaul of petrochemical plants, a large number of pressure vessels and flanges are involved in the disassembly and assembly, and the disassembled bolts need to be reused. In order to improve the installation quality of the reused bolts, the disassembled old bolts need to be cleaned, rust-removed, and oiled. Traditionally, the cleaning of reused bolts is mostly kerosene immersion + manual brushing and cleaning + manual oiling. The mechanical form is single mechanical rust removal + immersion cleaning + manual oiling. The process is scattered and the single cleaning is time-consuming and labor-intensive. The work efficiency and cleaning quality cannot be guaranteed. Due to the lack of cleaning quality, the utilization rate of old bolts is generally below 60%.

[0003] At present, there are roughly two types of mechanical equipment for bolt cleaning in the industry. The first type is used for cleaning and rust removal of old bolts. Compared with pure manual operations, it can improve some efficiency, but it can still only clean one bolt at a time, and the efficiency improvement is not obvious.

[0004] The second type is used for cleaning new bolts, using high-pressure water guns or ultrasonic waves to clean the debris and dust with low adhesion on the surface of new bolts, such as the structure disclosed in the invention patent application "A New Bolt Cleaning Equipment" (application publication number CN110252722A) with application number CN201910697886.2, which includes an equipment body, a first conveyor belt, a second conveyor belt, a vibration cleaning mechanism, a cleaning tank, a first material guide slope, a second material guide slope, a third conveyor belt, a flushing pipe, a hot air duct, a partition, a first water storage tank, a second water storage tank and a partition column. The left side of the equipment body A first conveyor belt is provided, a second conveyor belt is provided on the top of the main body of the equipment, a vibration cleaning mechanism is provided on the second conveyor belt, a cleaning tank is provided below the second conveyor belt, a first material guide slope is provided on the left tank wall of the cleaning tank, a second material guide slope is provided on the right tank wall of the cleaning tank, a third conveyor belt is provided on the right side of the second material guide slope, a flushing pipe and a hot air duct are provided above the third conveyor belt, the hot air duct is located on the right side of the flushing pipe, a partition is provided between the flushing pipe and the hot air duct, a first water storage tank and a second water storage tank are provided below the flushing pipe and the hot air duct respectively, and a partition column is provided between the first water storage tank and the second water storage tank. This application can clean new bolts, but it seems to be unable to clean highly bonded attachments (oxidized oil, layered dust, oxidized rust, etc.). In addition, due to the grinding and brushing, kerosene soaking and washing, manual oiling and lubrication of the open bolts on site, it brings unfavorable factors to the cleaning and environmental protection of the site, and the cleaning quality is also not guaranteed.

[0005] Therefore, in the cleaning work of recycled bolts during the maintenance of petrochemical equipment, manual or semi-mechanical operations are time-consuming and labor-intensive, with low cleaning quality, requiring the maintenance unit to invest a lot of manpower and material resources, and can no longer meet the needs of efficient maintenance. Therefore, it is of great significance to design an efficient, environmentally friendly, and stable quality cleaning equipment to achieve a fully automatic, streamlined, fully enclosed, pollution-free, and stable quality bolt cleaning machine. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a bolt cleaning machine capable of cleaning a plurality of bolts, especially bolts with highly bonded attachments on the surface, in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a bolt cleaning machine, comprising:

[0008] a base having a top wall;

[0009] It is characterized by also including:

[0010] A feeding belt is movably arranged on the top wall of the base, and the feeding belt includes a plurality of feeding rollers arranged side by side along the moving direction and parallel to the top wall of the base, and a mounting groove for placing bolts thereon is formed between two adjacent feeding rollers;

[0011] A roller brush is rotatably disposed above the feed belt and is used to brush the bolts placed on the mounting groove, and the rotating shaft of the roller brush is substantially parallel to the feed roller column and extends along the axial direction of the feed roller column;

[0012] The driving member has an output end that acts on the feeding belt to drive the feeding belt to move.

[0013] The feed belt can realize repeated operation of the cleaning machine by reciprocating back and forth, or can realize repeated operation of the cleaning machine by running in a circular clockwise or counterclockwise direction. Preferably, the feed belt runs in a circular shape along the outer peripheral wall of the base.

[0014] Preferably, it also includes a rack extending along the moving direction of the feeding belt, and there are at least two racks, which are respectively arranged at the two ends of each feeding roller column, and each feeding roller column is provided with a first gear matched with the rack at both ends, and each first gear is coaxially arranged with the corresponding feeding roller column; the driving member includes a motor and a second gear connected to the output shaft of the motor, and the tooth portion of the second gear is meshed between two adjacent feeding roller columns. In this way, the motor can drive the second gear to rotate, and then drive the feeding roller column to move, and during the movement, each feeding roller column will rotate, so that the bolts on the feeding roller column will also rotate, so that all surfaces of the bolts can be better cleaned.

[0015] Preferably, the roller brush is installed above the feed belt through a connecting frame. The roller brush has at least two rotating shafts, namely the first rotating shaft and the second rotating shaft. The first rotating shaft and the second rotating shaft are arranged side by side in the connecting frame along the moving direction of the feed belt, and the two ends of the first rotating shaft and the second rotating shaft are constrained on the connecting frame in a rotatable manner. The roller brush is an annular brush body that is simultaneously sleeved on the outer periphery of the first and second rotating shafts. In this way, the roller brush can brush multiple bolts at the same time. Of course, the roller brush of the present application can also adopt an existing structure with only one rotating shaft, and the roller brush is sleeved on the outer periphery of the rotating shaft.

[0016] The roller brush in the present application contacts the bolt when in use. Since the bolt moves with the feed belt, the roller brush can also rotate under the friction of the moving bolt when there is no driving mechanism. In order to make the annular brush body rotate synchronously when the feed belt moves, further, the ends of the same side of the first rotating shaft and the second rotating shaft are respectively provided with a driving gear and a driven gear, and the driving gear and the driven gear are provided with a transmission belt that meshes with the driving gear and the driven gear and is connected end to end. The output shaft of the motor is connected to the first rotating shaft through a transmission mechanism. The above-mentioned transmission mechanism can be an existing transmission mechanism such as a gear set. Of course, a driving mechanism can also be set up separately to drive the first rotating shaft to rotate.

[0017] In the above scheme, in order to make the cleaning machine of the present application suitable for bolts of different diameters, preferably, it also includes a height adjustment component connected to the connecting frame for adjusting the height of the connecting frame.

[0018] The height adjustment component can be selected from pneumatic cylinders, hydraulic cylinders, screw nut components, etc. Preferably, the height adjustment component has at least two groups and is arranged at intervals along the moving direction of the feed belt. Each group of height adjustment components includes a screw, a nut, a connector, and a spring. The screw is arranged vertically and fixed relative to the base. The nut is threadedly connected to the screw. The spring is sleeved on the outer periphery of the screw, and the lower end of the spring abuts against the upper end surface of the nut. The upper end of the spring is located above the top of the screw and constrained on the connector, so that the connector always has a tendency to move upward, and the connector is connected to the connection frame. In this way, the height of the connection frame can be adjusted by rotating the nut. Since the connector connected to the connection frame is supported on the upper end of the spring, the connection frame can float up and down when subjected to external force, so that the roller brush can fit better with the bolt, thereby improving the cleaning effect.

[0019] In the above schemes, in order to maintain the cleanliness of the on-site environment, preferably, a dust hood and a dust suction fan are also included, the dust hood has a dust suction chamber with an opening facing downward, and the dust hood is arranged above the above-mentioned roller brush, the opening of the dust suction chamber is opposite to the roller brush, and the air inlet end of the dust suction fan is connected to the dust suction chamber.

[0020] In order to further clean the bolts after being cleaned by the roller brush, preferably, a cleaning trough is also included, which has a cleaning cavity with an open top, and is located downstream of the above-mentioned roller brush along the moving direction of the feed belt. The feed belt passes over the top of the cleaning trough, and a part of the feed belt is located in the cleaning cavity to form a cleaning portion.

[0021] In order to dry the bolts after cleaning, preferably, the air outlet end of the dust suction fan is located above the feeding belt and downstream of the cleaning part, and a filter is provided between the air inlet end and the air outlet end of the dust suction fan.

[0022] Finally, in order to oil the bolts after drying, preferably, it also includes an oiling device located downstream of the air outlet end of the above-mentioned dust suction fan and above the feeding belt, and an oil receiving trough located below the feeding belt. The oiling device includes an oil outlet part with an oil outlet facing downward and opposite to the feeding belt, and a brush arranged downstream of the oil outlet part, with the brush head of the brush facing downward and opposite to the feeding belt. The oil receiving trough has an oil receiving chamber with an open top, and the top of the oil receiving chamber is opposite to the oiling device.

[0023] Compared with the prior art, the advantages of the present invention are: by arranging a feeding belt, a roller brush and a driving member capable of driving the feeding belt to move on the base, multiple bolts can be placed in each installation slot of the feeding belt in sequence, and under the action of the roller brush above the feeding belt, dirt attached to each bolt can be brushed off by the roller brush, thereby enabling the present invention to clean multiple bolts, especially old bolts with highly bonded attachments on the surface. The present invention has a simple structure and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of an embodiment of the present invention from another perspective;

[0026] Figure 3 is a cross-sectional view of an embodiment of the present invention;

[0027] Figure 4 for Figure 1 Enlarged view of part A in the middle;

[0028] Figure 5 Schematic diagram of the connection structure between the feeding roller and the rack in an embodiment of the present invention;

[0029] Figure 6 It is a structural schematic diagram of a height adjustment component in an embodiment of the present invention;

[0030] Figure 7 for Figure 6 sectional view of . DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] like Figures 1 to 7 As shown, a preferred embodiment of a bolt cleaning machine of the present invention is shown, which includes a base 1, a feeding belt 2, a roller brush 3, an ash collecting trough 4, a driving member 5, a height adjustment component 6, a dust hood 7, a dust suction fan 71, a cleaning trough 8, an oiling device 9, and an oil collecting trough 90.

[0033] The base 1 is a hollow frame structure. The ash receiving tank 4, the cleaning tank 8, and the oil receiving tank 90 are arranged in the base 1 from left to right (such as Figure 2 , 3 As shown). The ash receiving tank 4 has an ash receiving chamber 40 with an open top. The cleaning tank 8 has a cleaning chamber 80 with an open top. The oil receiving tank 90 has an oil receiving chamber 900 with an open top. At the same time, the cleaning tank 8 of this embodiment has a vibration function to improve the cleaning effect.

[0034] The outer peripheral wall of the base 1 is provided with a ring-shaped running rack 22, which is sequentially surrounded by the top wall, right side wall, bottom wall and left side wall of the base 1. In this embodiment, there are two racks 22, which are arranged one after the other on the outer peripheral wall of the base 1. The feed belt 2 is a ring-shaped structure connected end to end. The feed belt 2 surrounds and is supported on the outer periphery of the rack 22, so that the feed belt 2 can move along the rack 22 under the action of external force. In this embodiment, the feed belt 2 moves in the clockwise direction (such as Figure 2 , 3 In the direction indicated by the arrow in the middle). The feeding belt 2 includes a plurality of feeding rollers 21 arranged side by side along the moving direction and parallel to the top wall of the base 1, and a mounting groove 20 for bolts to be placed thereon is formed between two adjacent feeding rollers 21. Two racks 22 are respectively arranged at the two ends of each feeding roller 21, and a first gear 211 that cooperates with the rack 22 is provided at both ends of each feeding roller 21. Each first gear 211 is coaxially arranged with the corresponding feeding roller 21 and fixed on the corresponding feeding roller 21, and the ends of adjacent feeding rollers 21 on the same side are connected by a connecting strip 23, and the ends of each feeding roller 21 can rotate relative to the connecting strip 23. At the same time, in the present embodiment, the feeding belt 2 passes over the top of the cleaning tank 8, and a part of the feeding belt 2 is located in the cleaning chamber 80 to form a cleaning portion 2a. For details, please refer to Figures 1 to 5 .

[0035] like Figures 1 to 3As shown, the output end of the driving member 5 acts on the feeding belt 2 to drive the feeding belt 2 to move. In this embodiment, the driving member 5 includes a motor 51 installed on the base 1, a third gear 53 connected to the output shaft of the motor 51, a fourth gear 54 meshing with the third gear 53, a fifth gear 55 meshing with the fourth gear 54, and a second gear 52, wherein the output shaft of the motor 51 extends along the axial direction of the feeding roller 21, and there are two fourth gears 54, which are arranged on both sides of the base 1 one after the other, and the two fourth gears 54 are connected by a fourth connecting shaft 541, and one of the fourth gears 54 is connected to the third gear 53. The second gear 52 is mounted on the fifth connecting shaft 551 and fixed relative to the fifth connecting shaft 551, and is located between the two fifth gears 55. The toothed portion of the second gear 52 is meshed between two adjacent feed rollers 21. In this way, the second gear 52 can drive the feed belt to move along the rack 22 under the drive of the motor 51, and during the movement of the feed belt 2, each feed roller 21 can rotate around its own axis under the cooperation of its first gear 211 and the rack 22, so that the bolts on the feed roller 21 can also rotate.

[0036] The roller brush 3 is rotatably arranged above the feed belt 2 and is located directly above the ash receiving groove 4, and is used to brush the bolts placed on the mounting groove 20, and the rotating shaft of the roller brush 3 is substantially parallel to the feed roller column 21 and extends along the axial direction of the feed roller column 21. In this embodiment, the roller brush 3 is installed above the feed belt 2 through the connecting frame 30, and the roller brush 3 has two rotating shafts, namely the first rotating shaft 31 and the second rotating shaft 32. The first rotating shaft 31 and the second rotating shaft 32 are arranged side by side in the connecting frame 30 along the moving direction of the feed belt 2, and the two ends of the first rotating shaft 31 and the second rotating shaft 32 are rotatably constrained on the connecting frame 30, and the roller brush 3 is an annular brush body simultaneously sleeved on the outer periphery of the first and second rotating shafts. When the first rotating shaft 31 and the second rotating shaft 32 rotate, the annular brush body can be driven to rotate. In order to drive the first and second rotating shafts to rotate, the ends of the first rotating shaft 31 and the second rotating shaft 32 on the same side are respectively sleeved with a driving gear 33 and a driven gear 34, and the driving gear 33 and the driven gear 34 are sleeved with a transmission belt 35 that meshes with the driving gear 33 and the driven gear 34 and is connected end to end, and the output shaft of the motor 51 is transmission-connected with the first rotating shaft 31, thereby driving the first rotating shaft 31 and the second rotating shaft 32 to rotate synchronously. In this embodiment, the output shaft of the motor 51 is transmission-connected with the first rotating shaft 31 through the third gear 53, the sixth gear 56, and the seventh gear 57, wherein the sixth gear 56 meshes with the third gear 53, and the seventh gear 57 is sleeved on the end of the first rotating shaft 31 and meshes with the sixth gear 56.

[0037] The height adjustment assembly 6 is connected to the connection frame 30 and is used to adjust the height of the connection frame 30. The height adjustment assembly 6 has two groups and is arranged at intervals along the moving direction of the feeding belt 2. Each group of height adjustment assembly 6 includes a screw 61, a nut 62, a connector 63, and a spring 64. The screw 61 is arranged vertically and fixed relative to the base 1. The nut 62 is threadedly connected to the screw 61. The spring 64 is sleeved on the outer periphery of the screw 61, and the lower end of the spring 64 abuts on the upper end surface of the nut 62. The upper end of the spring 64 is located above the top of the screw 61 and constrained on the above-mentioned connector 63, so that the connector 63 always has a tendency to move upward, and the connector 63 is connected to the connection frame 30. In this embodiment, the connector 63 is a cover structure with an opening at the bottom, and the upper end of the spring 64 is inserted into the opening of the connector (the connector 63 can also be a structure with a convex portion extending downward in the center of the bottom wall, and the upper end of the spring is sleeved on the outer periphery of the convex portion and abuts on the bottom wall of the connector 63). In this way, the height of the connecting member 63 can be fine-tuned by rotating the nut 62, and the height of the connecting frame 30 and the roller brush 3 in the connecting frame 30 can be fine-tuned, and the fine-tuning of the height does not affect the meshing between the gears. Figure 6 , 7 .

[0038] The dust hood 7 has a dust suction chamber 70 with an opening facing downward, and the dust hood 7 is arranged above the roller brush 3, and the opening of the dust suction chamber 70 is opposite to the roller brush 3. The dust suction fan 71 is located on the right side of the dust hood 7 (such as Figure 2 , 3 ), and the air inlet end of the dust suction fan 71 is connected to the dust suction chamber 70. The air outlet end 71a of the dust suction fan 71 is located above the feeding belt 2 and downstream of the cleaning part 2a. A filter 72 is provided between the air inlet end and the air outlet end 71a of the dust suction fan 71. The filter 72 is a filter screen, which is detachably arranged on the dust suction fan 71, so as to facilitate the cleaning and replacement of the filter screen.

[0039] The oiling device 9 is arranged above the feeding belt 2 and on the right side of the air outlet end 71a of the dust suction fan 71, and is located directly above the oil receiving groove 90. The oiling device 9 includes an oil outlet 91 with an oil outlet facing downward and opposite to the feeding belt 2, and a brush 92 arranged downstream of the oil outlet 91, with the brush head of the brush 92 facing downward and opposite to the feeding belt 2.

[0040] Thus, when the bolts need to be cleaned, multiple bolts can be input from the left side of the base 1 (such as Figure 2 , 3 As shown), and placed on the feeding belt 2 below the roller brush 3, the roller brush 3 first brushes the bolts to remove rust and dirt from the bolts, and the waste residue, dirt, etc. brushed off can be collected in the ash receiving groove 4, and the dust generated by the roller brush can be adsorbed on the filter element 72 through the dust hood 7. The bolts brushed by the roller brush 3 enter the cleaning groove 8 as the feeding belt 2 moves. Through the rotation of the bolts in the cleaning groove 8 and the vibration of the cleaning groove 8 itself, the floating dust, light oil stains, etc. attached to the bolts are cleaned once, so that the surface of the bolts is smooth. The cleaned bolts are blown dry by the air outlet 71a of the dust suction fan 71. After the bolts are blown dry, they are oiled and brushed with oil by the oiling device 9, so that the grease is evenly attached to the surface of the bolts, ensuring the lubrication quality. The bolts that have passed through the oiling device 9 are output from the right side of the base 1.

[0041] The bolt cleaning machine of this embodiment has the following effects:

[0042] 1. The on-site environmental protection is dust-free and oil-free, and waste is centrally processed, which greatly improves the working conditions and working environment;

[0043] 2. The work efficiency is 6-10 times that of the original manual and semi-mechanical operations;

[0044] 3. The qualified rate of on-site old bolt cleaning reaches more than 90%, and the energy-saving and consumption-reducing effect is remarkable;

[0045] 4. The machine has a simple structure, clear principle, simple maintenance, convenient transportation and strong adaptability;

[0046] 5. The machine is easy to operate, and the training is convenient and easy to understand, and it is quick to master;

[0047] 6. Low power consumption, energy saving and environmental protection advantages are obvious;

[0048] 7. Reasonable structure and enclosed safety protection are in place.

Claims

1. A bolt cleaning machine, comprising: A base (1) having a top wall; It is characterized by also including: A feeding belt (2) is movably arranged on the top wall of the base (1), the feeding belt (2) comprising a plurality of feeding rollers (21) arranged side by side along a moving direction and parallel to the top wall of the base (1), and a mounting groove (20) for placing bolts thereon is formed between two adjacent feeding rollers (21); A roller brush (3) is rotatably disposed above the feed belt (2) and is used to brush the bolts placed on the mounting groove (20), and the rotating shaft of the roller brush (3) is substantially parallel to the feed roller column (21) and extends along the axial direction of the feed roller column (21); A driving member (5), the output end of which acts on the feeding belt (2) to drive the feeding belt (2) to move; the driving member (5) comprises a motor (51); The roller brush (3) is installed above the feed belt (2) through a connecting frame (30). The roller brush (3) has at least two rotating shafts, namely a first rotating shaft (31) and a second rotating shaft (32). The first rotating shaft (31) and the second rotating shaft (32) are arranged side by side and spaced apart in the connecting frame (30) along the moving direction of the feed belt (2). Both ends of the first rotating shaft (31) and the second rotating shaft (32) are rotatably constrained on the connecting frame (30). The invention relates to an annular brush body which is sleeved on the outer peripheries of the first and second rotating shafts at the same time; a driving gear (33) and a driven gear (34) are sleeved on the ends of the first rotating shaft (31) and the second rotating shaft (32) on the same side respectively, and a transmission belt (35) which meshes with the driving gear (33) and the driven gear (34) and is connected end to end is sleeved on the driving gear (33) and the driven gear (34); the output shaft of the motor (51) is transmission-connected to the first rotating shaft (31) through a transmission mechanism; It also includes a height adjustment component (6) connected to the connection frame (30) and used to adjust the height of the connection frame (30); The height adjustment components (6) have at least two groups and are arranged at intervals along the moving direction of the feeding belt (2). Each group of height adjustment components (6) includes a screw rod (61), a nut (62), a connecting piece (63), and a spring (64). The screw rod (61) is arranged vertically and fixed relative to the base (1). The nut (62) is threadedly connected to the screw rod (61). The spring (64) is sleeved on the outer periphery of the screw rod (61), and the lower end of the spring (64) abuts against the upper end surface of the nut (62). The upper end of the spring (64) is located above the top end of the screw rod (61) and is constrained on the connecting piece (63), so that the connecting piece (63) always has a tendency to move upward, and the connecting piece (63) is connected to the connecting frame (30).

2. The bolt cleaning machine according to claim 1, characterized in that: It also includes a rack (22) extending along the moving direction of the feeding belt (2), the rack (22) has at least two and is respectively arranged at the two ends of each feeding roller (21), and each feeding roller (21) is provided with a first gear (211) matched with the rack (22) at both ends, and each first gear (211) is coaxially arranged with the corresponding feeding roller (21); the driving member (5) includes a second gear (52) drivingly connected to the output shaft of the motor (51), and the tooth portion of the second gear (52) is meshed between two adjacent feeding rollers (21).

3. The bolt cleaning machine according to any one of claims 1 to 2, characterized in that: The invention also comprises a dust suction hood (7) and a dust suction fan (71), wherein the dust suction hood (7) has a dust suction chamber (70) with an opening facing downward, and the dust suction hood (7) is arranged above the roller brush (3), the opening of the dust suction chamber (70) is opposite to the roller brush (3), and the air inlet end of the dust suction fan (71) is connected to the dust suction chamber (70).

4. The bolt cleaning machine according to claim 3, characterized in that: It also includes a cleaning trough (8), which has a cleaning cavity (80) with an open top, and is located downstream of the roller brush (3) along the moving direction of the feeding belt (2). The feeding belt (2) passes over the top of the cleaning trough (8), and a part of the feeding belt (2) is located in the cleaning cavity (80) to form a cleaning portion (2a).

5. The bolt cleaning machine according to claim 4, characterized in that: The air outlet end (71a) of the dust suction fan (71) is located above the feeding belt (2) and downstream of the cleaning section (2a). A filter element (72) is provided between the air inlet end and the air outlet end (71a) of the dust suction fan (71).

6. The bolt cleaning machine according to claim 5, characterized in that: It also includes an oiling device (9) located downstream of the air outlet end (71a) of the dust suction fan (71) and above the feeding belt (2), and an oil receiving groove (90) located below the feeding belt (2). The oiling device (9) includes an oil outlet member (91) with an oil outlet facing downward and opposite to the feeding belt (2), and a brush (92) located downstream of the oil outlet member (91), with a brush head of the brush (92) facing downward and opposite to the feeding belt (2). The oil receiving groove (90) has an oil receiving cavity (900) with an open top, and the top of the oil receiving cavity is opposite to the oiling device (9).

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