Small plastic part transporting and bagging equipment

Abstract

The invention relates to the technical field of plastic part production, and discloses small plastic part transporting and bagging equipment which comprises a conveying seat, a feeding frame, a discharging frame and a separating mechanism, the feeding frame and the discharging frame are arranged at the top of the conveying seat, and the separating mechanism is movably arranged at the upper end of the feeding frame. A monitoring panel is installed on the inner wall of one side of the conveying base, a plurality of cameras are installed on the monitoring panel and used for detecting the number of plastic parts and facilitating follow-up packaging treatment, the feeding frame is installed in the conveying base, the separating mechanism comprises a pair of clamping plates, the clamping plates are movably clamped to the top of the conveying base, and the discharging frame is installed on one side of the feeding frame. The separating mechanism is used for cleaning the plastic parts conveyed on the feeding frame; in the conveying process, the plastic parts can be combed, meanwhile, water gap residues on the surfaces of the plastic parts can be clamped between the separation pieces, the plastic parts can be rapidly stripped, residues on the surfaces of the plastic parts are reduced, and the unexpected situation that packaging bags are scratched in the follow-up packaging process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic parts production, in particular to a small plastic parts transport bagging device. Background Art

[0002] Transport packaging is suitable for large, large, and heavy plastic accessories. The plastic accessories are fixed by the bracket to avoid collision during transportation and facilitate inspection. The bracket can be made of wood, metal or plastic materials and can be customized according to the shape and size of the plastic accessories.

[0003] Before transportation, plastic parts need to be polished and cleaned to reduce burrs and nozzle residues on the surface. However, due to the different shapes of injection molded parts, such as spherical or pancake-shaped plastic parts, there will be omissions during the production and grinding process. In some cases, nozzle residues may become a safety hazard. For example, sharp edges may scratch people or damage other parts. For this reason, we propose a small plastic parts transportation bagging equipment to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a small plastic piece transport bagging device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a small plastic piece transport bagging device, comprising a transmission seat, a feeding rack and a discharge rack arranged on the top of the transmission seat, a separation mechanism movably arranged on the upper end of the feeding rack, a conveyor belt installed on one side of the transmission seat, the conveyor belt is arranged in an inclined manner, a monitoring panel is installed on the inner wall of one side of the transmission seat, and a plurality of cameras are installed on the monitoring panel for detecting the number of plastic pieces to facilitate subsequent packaging processing;

[0006] The feed rack is installed inside the transmission seat, and the separation mechanism includes a pair of clamping plates, which are movably clamped on the top of the transmission seat, and the discharge rack is installed on one side of the feed rack. The separation mechanism is used to clean the plastic parts transmitted on the feed rack. When the plastic parts need to be transported and packaged, the plastic parts can be transported to one side of the feed rack with the help of a conveyor belt. In conjunction with the monitoring panel, the number of single feeds can be determined to reduce errors in the packaging process. During the transmission process, the plastic parts can be evenly laid on the feed rack under the action of the separation mechanism, and the debris mixed inside can be shaken off. Subsequently, they can be transported to the inside of the packaging bag with the cooperation of the discharge rack.

[0007] Preferably, a conveyor belt is provided on the movable card of the feeding rack, and a plurality of separation grooves are opened on the surface of the conveyor belt, and the separation grooves are arranged in a uniform array on the surface of the conveyor belt. A plurality of positioning plates are installed on the conveyor belt, and the positioning plates are elastic and used to block plastic accessories. The positioning plates and the separation grooves are vertically staggered, and the positioning plates can quantitatively separate the plastic accessories to facilitate subsequent transportation and packaging, and the debris remaining during the transportation process can be accumulated inside the separation groove to reduce its entry into the packaging bag.

[0008] Preferably, a movable rack is installed on the positioning plate, and a plurality of buffer balls are fixedly connected to the movable rack. The buffer balls are made of rubber and have strong magnets inside. The buffer balls can be squeezed during transportation. A plurality of circular grooves are opened on the positioning plate, and a reset rod is movably provided inside the circular grooves. The reset rod is a pneumatic tube, and the position of the reset rod corresponds to the buffer ball. The female ball can be squeezed between the reset rod, causing the reset rod to expand, thereby causing the positioning plate to deform, and can quickly shake off debris stuck or adsorbed on the surface during transportation, thereby playing a self-cleaning role.

[0009] Preferably, the separation mechanism also includes a pair of positioning slide bars and multiple compression tubes, the pair of positioning slide bars are movably clamped on the top of the clamping plate, a rotating disk is rotatably provided at one end of the positioning slide bar, and a fixed shaft is installed between the rotating disks, the compression tube is clamped on the fixed shaft, the compression tube is arranged on the fixed shaft in a uniform array, and the edge of the rotating disk can be against the surface of the conveyor belt, a pair of air pressure rings are installed inside the compression tube, a plurality of hollow tubes are installed at the middle end of the compression tube, the hollow tubes are arranged on the outer wall of the compression tube in a uniform array, the hollow tube is connected with the air pressure ring, a movable shaft is inserted inside the hollow tube, and when the air pressure ring changes, the air pressure inside the hollow tube can change, and the movement of the movable shaft can be controlled, thereby playing a role in combing the plastic accessories.

[0010] Preferably, a plurality of connecting rings are installed on the surface of the movable shaft, a plurality of conduction grooves are opened on the connecting ring, and a limit block is clamped inside the transmission groove. A plurality of separation sheets are installed on the connecting ring, and the separation sheets are "U"-shaped and elastic. The separation sheets are arranged in a uniform array on the connecting ring, and the positions of the separation sheets correspond to the conduction grooves and elastic barbs are provided inside. The separation sheets are used to comb plastic parts and can play a role in stripping edge water outlets. Larger plastic water outlets can be stripped during transportation to reduce the possibility of them entering the packaging bag and scratching the packaging bag.

[0011] Preferably, connecting shafts are inserted into the outer walls of the compression tubes, the connecting shafts and the hollow tubes are staggered, a plurality of positioning rings are clamped on the connecting shafts, the positioning rings are elastic and are located between the compression tubes, a plurality of metal blocks are installed inside the positioning rings, and the metal blocks are evenly distributed inside the positioning rings, the metal blocks can drive the positioning rings to move under the action of strong magnets, and can cooperate with the connecting shafts to squeeze the compression tubes.

[0012] Preferably, a support plate and a separation bucket are installed inside the discharge rack, the separation bucket is arranged at an angle, one end of the separation bucket is narrowed for conveying, rectangular frames are installed on both sides of the support plate, the rectangular frames are elastic and have multiple clamping rods installed on the top, and a guide plate is installed on the top of the clamping rods, the guide plate is against one side of the conveyor belt, and the guide plate can receive plastic accessories dumped from one side of the feeding rack.

[0013] Preferably, a straight groove is provided on the top of the guide plate, and a plurality of swing plates are installed inside the straight groove. The swing plates are tilted upward toward the side away from the transmission seat, and a plurality of counterweight rods are also installed at the bottom of the swing plates. The counterweight rods are made of metal and are vertically staggered with the swing plates, so as to quickly screen out residues and debris between the plastic accessories during transportation.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention can attract the positioning ring containing the metal block inside the buffer ball under the action of the strong magnet inside, thereby pulling the connecting shaft to deform, and can squeeze the surface of the compression tube, so that the gas inside the air pressure tube is transported to the inside of the hollow tube, so that the movable shaft moves, and can also clamp the water outlet residue on the surface of the plastic part between the separation sheets while combing the plastic part, and quickly peel it off, thereby reducing the residue on the surface of the injection molded part and reducing the accidental scratching of the packaging bag in the subsequent packaging process;

[0016] 2. When the plastic parts are transferred to the conveyor belt, the present invention can move along with the conveyor belt, and the conveyor belt can drive the rotating disk to move, so that its linear speed remains consistent. The compression tube can move in a circle, so that the movable shaft can continuously flip the plastic parts on the surface of the conveyor belt, which can reduce the situation of stacking together, play a role in assisting the combing and chip removal, and reduce the situation of mixed plastic debris in the accessories;

[0017] 3. The present invention is transported to the top of the guide plate through the plastic part, and the movable plug-in frame can be squeezed with one end of the guide plate, which can squeeze between the buffer ball and the reset plug rod to make it expand, and can shake off the debris remaining on the positioning plate and the conveyor belt;

[0018] 4. When the plastic parts are transported on the guide plate, the reset rack and the guide plate interact with each other, so that the excess debris can be shaken off along the gap of the swing plate, which is convenient for bagging with the separation bucket and reduces the situation where debris enters the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a partial structural schematic diagram of the separation mechanism of the present invention;

[0021] Figure 3 It is a schematic diagram of the hollow tube structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the local structure of the feeding rack of the present invention;

[0023] Figure 5 For the present invention Figure 4 A partial enlarged schematic diagram in the middle;

[0024] Figure 6 This is a schematic diagram of the top structure of the material discharging rack of the present invention;

[0025] Figure 7 This is a schematic diagram of the bottom structure of the material discharging rack of the present invention;

[0026] Figure 8 For the present invention Figure 7 A partial enlarged schematic diagram of point B in the middle;

[0027] In the figure: 1. transmission seat; 2. feeding rack; 3. separation mechanism; 4. discharge rack; 11. conveyor belt; 12. monitoring panel; 21. conveyor belt; 22. separation slot; 23. positioning plate; 24. movable rack; 241. buffer ball; 25. reset rod; 31. clamping plate; 32. positioning slide rod; 33. compression tube; 34. connecting shaft; 35. positioning ring; 36. hollow tube; 37. movable shaft; 371. separation ring; 38. separation sheet; 41. support plate; 42. rectangular frame; 43. separation bucket; 44. guide plate; 45. swing plate; 451. counterweight rod. DETAILED DESCRIPTION

[0028] 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.

[0029] See also Figure 1-Figure 8The present invention provides a technical solution: a small plastic piece transport bagging device, comprising a transmission seat 1, a feeding rack 2 and a discharge rack 4 arranged on the top of the transmission seat 1, a separation mechanism 3 movably arranged on the upper end of the feeding rack 2, a conveyor belt 11 is installed on one side of the transmission seat 1, and the conveyor belt 11 is arranged in an inclined manner, a monitoring panel 12 is installed on the inner wall of one side of the transmission seat 1, and a plurality of cameras are installed on the monitoring panel 12 for detecting the number of plastic pieces, so as to facilitate subsequent packaging processing;

[0030] The feeding rack 2 is installed inside the transmission seat 1, and the separation mechanism 3 includes a pair of clamping plates 31, which are movably clamped on the top of the transmission seat 1, and the discharge rack 4 is installed on one side of the feeding rack 2. The separation mechanism 3 is used to clean the plastic parts transmitted on the feeding rack 2. When the plastic parts need to be transported and packaged, the plastic parts can be transported to the side of the feeding rack 2 with the help of the conveyor belt 11. In conjunction with the monitoring panel 12, the number of single feeds can be determined to reduce errors in the packaging process. During the transmission process, the plastic parts can be evenly laid on the feeding rack 2 under the action of the separation mechanism 3, and the debris mixed inside can be shaken off, and then they can be transported to the inside of the packaging bag with the cooperation of the discharge rack 4.

[0031] like Figure 4 As shown, in order to reduce the situation where debris mixed in the plastic accessories enters the packaging bag during the transmission process, a conveyor belt 21 is movable on the feeding rack 2, and a plurality of separation grooves 22 are opened on the surface of the conveyor belt 21. The separation grooves 22 are arranged in a uniform array on the surface of the conveyor belt 21. A plurality of positioning plates 23 are installed on the conveyor belt 21. The positioning plates 23 are elastic and are used to block the plastic accessories. The positioning plates 23 and the separation grooves 22 are vertically staggered, so that excess debris inside can be shaken off and remain inside the separation grooves 22.

[0032] like Figure 5 As shown, in order to reduce the situation where debris remains on the positioning plate 23 during long-term transportation and processing, a movable bracket 24 is installed on the positioning plate 23, and a plurality of buffer balls 241 are fixedly connected to the movable bracket 24. The buffer balls 241 are made of rubber and have strong magnets inside. The buffer balls 241 can be squeezed during transportation. A plurality of circular grooves are opened on the positioning plate 23, and a reset rod 25 is movably provided inside the circular groove. The reset rod 25 is an air pressure tube, and the position of the reset rod 25 corresponds to the buffer ball 241. As the reset rod 25 and the buffer ball 241 are squeezed against each other, the reset rod 25 can expand and deform, causing the positioning plate 23 to deform, and can quickly shake off the debris and dirt accumulated and adsorbed in the edges and gaps.

[0033] like Figure 2As shown, plastic accessories are easily piled up during the transmission process, which affects the stability of subsequent transmission and feeding, and is prone to jamming. The separation mechanism 3 also includes a pair of positioning slide bars 32 and multiple compression tubes 33. The pair of positioning slide bars 32 are movably clamped on the top of the clamping plate 31, and a rotating disk is rotatably provided at one end of the positioning slide bar 32, and a fixed shaft is installed between the rotating disks. The compression tube 33 is clamped on the fixed shaft. The compression tube 33 is arranged on the fixed shaft in a uniform array, and the edge of the rotating disk can be against the surface of the conveyor belt 21. A pair of air pressure rings are installed inside the compression tube 33, and a plurality of hollow Tube 36, hollow tubes 36 are arranged in a uniform array on the outer wall of the compression tube 33, the hollow tubes 36 are connected with the air pressure ring, and a movable shaft 37 is inserted inside the hollow tube 36. Under the action of the strong magnet inside the buffer ball 241, the positioning ring 35 containing the metal block inside can be attracted, thereby pulling the connecting shaft 34 to deform, and the surface of the compression tube 33 can be squeezed to transport the gas inside the air pressure tube to the inside of the hollow tube 36, so that the movable shaft 37 moves, which can also be used to comb the plastic parts while clamping the water outlet residue on the surface of the plastic parts between the separation sheets 38, quickly peeling it off, and reducing the residue on the surface of the injection molded parts.

[0034] like Figure 3 As shown, in order to reduce the situation where debris remains on the surface of the plastic part, a plurality of connecting rings 371 are installed on the surface of the movable shaft 37, a plurality of conduction grooves are opened on the connecting ring 371, and a limit block is clamped inside the transmission groove, and a plurality of separation sheets 38 are installed on the connecting ring, the separation sheets 38 are "U"-shaped and elastic, and the separation sheets 38 are evenly arranged on the connecting ring 371. The position of the separation sheets 38 corresponds to the conduction groove and elastic barbs are arranged inside. The separation sheets 38 are used to comb the plastic parts and can play a role in edge water outlet stripping. The separation sheets 38 can be used in the feeding process. In the process, the sprue of the plastic accessory is stuck in its gap, and the larger sprue residue remaining on the surface of the injection molded part can enter along the conduction groove, so that one end of it is stuck between the separation sheets 38, and it can be limited and quickly peeled off during the fixed axis rotation activity, which plays a role in cleaning, and in the process of peeling, the rotating disk on one side of the positioning slide bar 32 can be made to reciprocate, so that the injection molded part can be cyclically cleaned, and the excess sprue residue can be cleaned, thereby reducing the workload of subsequent fine-tuning, and after the peeling and resetting are completed, the excess sprue fragments can be shaken off during the subsequent rotation process.

[0035] Preferably, connecting shafts 34 are inserted into the outer walls of the compression tubes 33, and the connecting shafts 34 and the hollow tubes 36 are staggered. A plurality of positioning rings 35 are clamped on the connecting shafts 34, and the positioning rings 35 are elastic and located between the compression tubes 33. A plurality of metal blocks are installed inside the positioning rings 35, and the metal blocks are evenly distributed inside the positioning rings 35.

[0036] like Figure 6As shown, in order to ensure the stability of transmission, a support plate 41 and a separation bucket 43 are installed inside the discharge rack 4. The separation bucket 43 is inclined, and one end of the separation bucket 43 is narrowed for transportation. Rectangular frames 42 are installed on both sides of the support plate 41. The rectangular frames 42 are elastic and have multiple clamping rods installed on the top, and a guide plate 44 is installed on the top of the clamping rod. The guide plate 44 is against one side of the conveyor belt 21, and the plastic parts are transported to the top of the guide plate 44, and the movable plug-in frame 24 can be squeezed with one end of the guide plate 44, which can squeeze the buffer ball 241 and the reset plug-in rod 25 to make it expand, and can shake off the debris remaining on the positioning plate 23 and the conveyor belt 21 onto the conveyor belt 21, which is convenient for subsequent transmission and cleaning.

[0037] like Figure 7 and Figure 8 As shown, in order to ensure the stability of transportation and reduce the residual debris, a straight groove is opened on the top of the guide plate 44, and a plurality of swing plates 45 are installed inside the straight groove. The swing plate 45 is tilted upward toward the side away from the transmission seat 1, and a plurality of counterweight rods 451 are also installed at the bottom of the swing plate 45. The counterweight rods 451 are made of metal and are vertically staggered with the swing plate 45. When the plastic parts are transported on the guide plate 44, the movable bracket 24 and the guide plate 44 interact with each other, and the excess debris can be shaken off along the gap of the swing plate 45, which is convenient for bagging with the separation bucket 43, reducing the situation of debris entering the packaging bag, and can also evenly lay the plastic accessories during the shaking process to reduce the accidental accumulation and jamming.

[0038] Working principle: First, when the plastic parts need to be transported and packaged, the conveyor belt 11 can be used to transport the plastic parts to one side of the feeding rack 2. With the help of the monitoring panel 12, the number of single feeds can be determined to reduce errors in the packaging process. During the transmission process, the plastic parts can be evenly laid on the feeding rack 2 under the action of the separation mechanism 3, and the debris mixed inside can be shaken off. Subsequently, they can be transported to the inside of the packaging bag with the cooperation of the discharge rack 4. When the plastic parts are transported to the conveyor belt 21, they can move with the conveyor belt 21, and the conveyor belt 21 can drive the rotating disk to move so that its linear speed remains consistent. The compression tube 33 can move in a circle, which can enable the movable shaft 37 to continuously flip the plastic parts on the surface of the conveyor belt 21, which can reduce the situation where they are stacked together, and during the flipping process, the debris mixed inside can be quickly shaken off to the inside of the separation tank 22;

[0039] Then, under the action of the strong magnet inside the buffer ball 241, the positioning ring 35 containing the metal block inside can be attracted, thereby pulling the connecting shaft 34 to deform, and the surface of the compression tube 33 can be squeezed, so that the gas inside the air pressure tube is transported to the inside of the hollow tube 36, so that the movable shaft 37 moves, and while combing the plastic parts, the water outlet residue on the surface of the plastic parts can be stuck between the separation sheets 38, and it can be quickly peeled off, reducing the residue on the surface of the injection molded parts;

[0040] Finally, when the plastic parts are transported to the top of the guide plate 44, the movable bracket 24 can be squeezed with one end of the guide plate 44, which can squeeze the buffer ball 241 and the reset rod 25 to make it expand, and the debris remaining on the positioning plate and the conveyor belt 21 can be shaken off. When the plastic parts are transported on the guide plate 44, the movable bracket 24 and the guide plate 44 interact with each other, and the excess debris can be shaken off along the gap of the swing plate 45, which is convenient for bagging with the separation bucket 43 and reduces the situation where debris enters the packaging bag.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small plastic parts transport bagging device, comprising a transmission seat (1), a feeding rack (2) and a discharge rack (4) arranged on the top of the transmission seat (1), and a separation mechanism (3) movably arranged on the upper end of the feeding rack (2), characterized in that: A conveyor belt (11) is installed on one side of the transmission seat (1), and the conveyor belt (11) is arranged in an inclined manner. A monitoring panel (12) is installed on the inner wall of one side of the transmission seat (1), and a plurality of cameras are installed on the monitoring panel (12) for detecting the number of plastic parts to facilitate subsequent packaging processing; The feeding rack (2) is installed inside the transmission seat (1), the separation mechanism (3) includes a pair of clamping plates (31), the clamping plates (31) are movably clamped on the top of the transmission seat (1), the discharge rack (4) is installed on one side of the feeding rack (2), and the separation mechanism (3) is used to clean the plastic parts transmitted on the feeding rack (2).

2. The small plastic parts transport bagging equipment according to claim 1 is characterized by: A conveyor belt (21) is movablely mounted on the feeding rack (2), a plurality of separation grooves (22) are provided on the surface of the conveyor belt (21), the separation grooves (22) are arranged in a uniform array on the surface of the conveyor belt (21), a plurality of positioning plates (23) are installed on the conveyor belt (21), the positioning plates (23) are elastic, the positioning plates (23) are used to block plastic accessories, and the positioning plates (23) and the separation grooves (22) are arranged in a vertical staggered manner.

3. The small plastic parts transport bagging equipment according to claim 2 is characterized by: A movable plug-in frame (24) is installed on the positioning plate (23), and a plurality of buffer balls (241) are fixedly connected to the movable plug-in frame (24). The buffer balls (241) are made of rubber and are provided with strong magnets inside. The buffer balls (241) can be squeezed during the transmission process. A plurality of circular grooves are opened on the positioning plate (23), and a reset plug rod (25) is movably provided inside the circular groove. The reset plug rod (25) is a pneumatic tube, and the position of the reset plug rod (25) corresponds to the buffer ball (241).

4. The small plastic parts transport bagging equipment according to claim 1 is characterized by: The separation mechanism (3) further comprises a pair of positioning slide bars (32) and a plurality of compression tubes (33), wherein the pair of positioning slide bars (32) are movably clamped on the top of the clamping plate (31), and a rotating disk is rotatably provided at one end of each positioning slide bar (32), and a fixed shaft is installed between the rotating disks, and the compression tube (33) is clamped on the fixed shaft, and the compression tube (33) is arranged on the fixed shaft in a uniform array, and a pair of air pressure rings are installed inside the compression tube (33), and a plurality of hollow tubes (36) are installed at the middle end of the compression tube (33), and the hollow tubes (36) are arranged on the outer wall of the compression tube (33) in a uniform array, and the hollow tubes (36) are connected with the air pressure ring, and a movable shaft (37) is inserted inside the hollow tube (36).

5. The small plastic parts transport bagging equipment according to claim 4 is characterized by: A plurality of connecting rings (371) are mounted on the surface of the movable shaft (37), a plurality of conducting grooves are formed on the connecting ring (371), and a limit block is clamped inside the transmission groove. A plurality of separating sheets (38) are mounted on the connecting ring (371), and the separating sheets (38) are U-shaped and elastic. The separating sheets (38) are arranged on the connecting ring (371) in a uniform array. The positions of the separating sheets (38) correspond to the conducting grooves and elastic barbs are arranged inside. The separating sheets (38) are used to comb plastic parts and can play a role in edge water outlet stripping.

6. The small plastic parts transport bagging equipment according to claim 4 is characterized by: The outer wall of the compression tube (33) is provided with a connecting shaft (34), the connecting shaft (34) and the hollow tube (36) are arranged in a staggered manner, a plurality of positioning rings (35) are clamped on the connecting shaft (34), the positioning ring (35) is elastic and is located between the compression tubes (33), a plurality of metal blocks are installed inside the positioning ring (35), and the metal blocks are evenly distributed inside the positioning ring (35).

7. The small plastic parts transport bagging equipment according to claim 1 is characterized by: A support plate (41) and a separation bucket (43) are installed inside the discharge rack (4); the separation bucket (43) is arranged in an inclined manner; one end of the separation bucket (43) is narrowed for conveying; rectangular frames (42) are installed on both sides of the support plate (41); the rectangular frames (42) are elastic and have a plurality of clamping rods installed on the top; and a guide plate (44) is installed on the top of the clamping rods.

8. The small plastic parts transport bagging equipment according to claim 7, characterized in that: The guide plate (44) has a straight groove at the top, and a plurality of swing plates (45) are installed inside the straight groove. The swing plates (45) are tilted upward toward a side away from the transmission seat (1). A plurality of counterweight rods (451) are also installed at the bottom of the swing plate (45). The counterweight rods (451) are made of metal and are vertically staggered with the swing plates (45).

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