Preheating device for manufacturing silicone mold of telephone parts

Abstract

The present application relates to the field of telephone parts production, especially to a preheating device for manufacturing silicone mold of telephone parts. The present application provides a preheating device for manufacturing silicone mold of telephone parts, which can automatically discharge silicone balls, make the preheating efficiency of silicone balls higher, and make the heating of the heating pan more uniform, so that the silicone balls in the heating pan are more completely melted, and the quality of the subsequently produced silicone mold is better. A preheating device for manufacturing silicone mold of telephone parts, comprising a base, a support and a heating pan; the top of the base is fixedly connected with four supports, and the top of the four supports is fixedly connected with a heating pan. The device can automatically discharge silicone balls, make the preheating efficiency of silicone balls higher, and make the heating of the heating pan more uniform, so that the silicone balls are more completely melted, and the quality of the subsequently produced silicone mold is better.

Description

Technical Field

[0001] This invention relates to the field of telephone parts manufacturing, and more particularly to a preheating device for manufacturing silicone molds for telephone parts. Background Technology

[0002] A telephone is a terminal device that transmits voice signals bidirectionally via electrical signals. In the mold-making process for telephone parts, silicone is often used to replicate the finished product, creating a silicone mold. This process involves melting silicone balls and then replicating the finished product. A preheating process is required before this initial step to facilitate the subsequent replication.

[0003] However, most current silicone preheating devices rely on manual feeding of silicone balls, which consumes a lot of manpower and time, resulting in low preheating efficiency of silicone balls. Furthermore, existing silicone preheating devices use a fixed heating source to heat a heating dish to melt the silicone balls. The heating dish is not heated evenly and is difficult to heat fully, resulting in the silicone balls in the heating dish not melting completely, which leads to poor quality of silicone molds produced later. Summary of the Invention

[0004] In view of the shortcomings or deficiencies of the prior art, the present invention provides a preheating device for manufacturing silicone molds for telephone parts, which can automatically feed silicone balls, making the preheating efficiency of silicone balls higher and the heating dish more uniformly heated, thereby making the silicone balls in the heating dish melt more thoroughly, and thus making the silicone molds produced subsequently of better quality.

[0005] A preheating device for manufacturing silicone molds for telephone parts includes a base, supports, a heating dish, a motor, a stirring blade, a discharge pipe, a hot air blower, sliding mounting feet, a heating component, and a feeding component. Four supports are fixedly connected to the top of the base, and a heating dish is fixedly connected between the tops of the four supports. A motor is fixedly connected to the top of the base, and the output shaft of the motor is rotatably connected to the heating dish. A stirring blade is fixedly connected to the upper part of the motor's output shaft, and the stirring blade is located inside the heating dish. A discharge pipe is fixedly connected to the bottom of the heating dish, and the heating dish communicates with the discharge pipe. Two hot air blowers are fixedly connected to the top of the base, and the two hot air blowers are symmetrically arranged. Sliding mounting feet are fixedly connected to the top of the base, and the heating component is mounted on the sliding mounting feet. The feeding component is mounted on the base.

[0006] Furthermore, the heating component includes a sliding rod, a heating resistance wire, and a cam. The sliding rod is slidably connected to the sliding mounting leg. A spherical cam is provided at the lower part of the sliding rod. A heating resistance wire is fixedly connected to the sliding rod and is wound around the heating dish. A cam is fixedly connected to the lower part of the motor's output shaft. The cam is located below the heating dish, and the spherical cam at the lower part of the sliding rod is located above the cam.

[0007] Furthermore, the top of the convex disk is provided with several hemispherical protrusions.

[0008] Furthermore, the feeding component includes mounting feet one, mounting feet two, a sliding rod, a feeding plate, and a top block. Two mounting feet one are fixedly connected to the top of the base, and the two mounting feet one are arranged symmetrically. Two mounting feet two are fixedly connected to the top of the base, and the two mounting feet two are arranged symmetrically. A sliding rod is fixedly connected to each of the two mounting feet one. The ends of the two sliding rods away from the mounting feet one are respectively fixedly connected to the two mounting feet two. A feeding plate is slidably connected between the two sliding rods. A top block is fixedly connected to the top of the sliding rod. The top block has a pushing inclined surface, and the pushing inclined surface on the top block contacts the bottom of the feeding plate.

[0009] Furthermore, it also includes a material storage component, which is mounted on the base. The material storage component includes a mounting bracket, a feeding hopper, a baffle, a return spring, and a push rod. The mounting bracket is fixedly connected to the top of the base, and the feeding hopper is fixedly connected to the mounting bracket. The feeding hopper has a discharge port at its bottom, and the baffle is rotatably connected to the bottom of the feeding hopper. The baffle is located below the discharge port at the bottom of the feeding hopper. Two return springs are connected between the baffle and the feeding hopper. Two push rods are fixedly connected to the upper part of the feeding plate. The two push rods are symmetrically arranged, and each push rod has a guide slope.

[0010] Furthermore, it also includes a sweeping component, which is disposed on the hopper. The sweeping component includes a mounting rod, a main gear, a swing arm, and a fixed gear. The mounting rod is fixedly connected to the bottom of the hopper, and the swing arm is rotatably connected to the mounting rod. The main gear is fixedly connected to the lower part of the swing arm, and the fixed gear is fixedly connected to the top of the heating dish. The main gear meshes with the fixed gear.

[0011] Furthermore, it also includes an arc-shaped toothed rod, a spur gear, and a rotating blade. An arc-shaped toothed rod is fixedly connected to the upper part of the swing arm, and two spur gears are rotatably connected to the feeding plate. The two spur gears are symmetrically arranged, and the arc-shaped toothed rod meshes with both spur gears. A rotating blade is fixedly connected to each of the two spur gears.

[0012] Furthermore, it also includes a clamping plate, which is fixedly connected between the tops of the two top rods and is slidably connected to the discharge hopper.

[0013] The beneficial effects of this invention are as follows: Workers place an appropriate amount of silicone balls on the feeding plate, then start the motor and two hot air blowers, and energize the heating resistance wire. The two hot air blowers dry the silicone balls on the feeding plate, while the heating resistance wire heats the heating dish. The reciprocating movement of the heating resistance wire provides more even heating to the heating dish. The silicone balls on the feeding plate fall into the heating dish, where they melt into liquid silicone. The liquid silicone is then discharged through the discharge pipe. This process is repeated, and the vibration generated by the top block pushing the feeding plate up and down allows for automatic discharge of the silicone balls, resulting in higher preheating efficiency. Furthermore, the reciprocating movement of the heating resistance wire via the sliding rod ensures more even heating of the heating dish, leading to a more thorough melting of the silicone balls and resulting in better quality silicone molds produced subsequently.

[0014] When the top block pushes the feeding plate to move diagonally upward, the baffle no longer blocks the discharge port at the bottom of the hopper, and the silicone balls in the hopper will roll downward for feeding. When the feeding plate moves diagonally downward and resets under the action of gravity, the baffle will block the discharge port at the bottom of the hopper again. In this way, by pushing the baffle downward through the two top rods and driving the baffle upward to reset through the reset spring, the discharge port at the bottom of the hopper can be opened and closed automatically, thereby further improving the preheating efficiency of the silicone balls.

[0015] When the top block pushes the feeding plate upwards at an angle, the swing arm will move the silicone balls on the feeding plate. When the feeding plate moves downwards at an angle and returns to its original position under the action of gravity, the swing arm will move the silicone balls on the feeding plate again. This process repeats itself. The main gear drives the swing arm to swing back and forth, which can more fully move the silicone balls on the feeding plate, reduce the occurrence of silicone balls clogging on the feeding plate, and make the silicone balls fall more smoothly into the heating dish, thus making the preheating of the silicone balls more efficient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first three-dimensional structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention.

[0018] Figure 3 This is a partial three-dimensional structural diagram of the feeding component of the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of the first part of the material storage component of the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of the feeding plate, mounting bracket, and discharge hopper of the present invention.

[0021] Figure 6 For the present invention Figure 5 A magnified three-dimensional structural diagram of A in the middle.

[0022] Figure 7 This is a partial three-dimensional structural diagram of the sweeping component of the present invention.

[0023] Figure 8 This is a cross-sectional perspective view of the feeding plate and the fixed toothed rod of the present invention.

[0024] Figure 9 This is a three-dimensional structural diagram of the second part of the material storage component of the present invention.

[0025] Figure 10 This is a partial three-dimensional structural diagram of the hopper and pallet of the present invention.

[0026] The meanings of the reference numerals in the diagram are as follows: 1: Base, 2: Support, 3: Heating dish, 4: Motor, 5: Stirring blade, 6: Discharge pipe, 7: Hot air blower, 8: Sliding mounting foot, 91: Sliding rod, 92: Heating resistance wire, 93: Protruding plate, 101: Mounting foot one, 102: Mounting foot two, 103: Sliding rod, 104: Feeding plate, 105: Top block, 111: Mounting bracket, 112: Discharge hopper, 113: Baffle, 114: Return spring, 115: Top rod, 121: Mounting rod, 122: Main gear, 123: Swing rod, 124: Fixed gear, 13: Arc-shaped gear, 14: Cylindrical gear, 15: Rotating blade, 16: Clamping plate. Detailed Implementation

[0027] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, welding, and bonding that are mature in the prior art, and will not be described in detail here.

[0028] Example 1: A preheating device for manufacturing silicone molds for telephone parts, such as... Figures 1-9As shown, the device includes a base 1, a support 2, a heating dish 3, a motor 4, a stirring blade 5, a discharge pipe 6, a hot air blower 7, sliding mounting feet 8, a heating component, and a feeding component. Four supports 2 are bolted to the top of the base 1, and the heating dish 3 is bolted between the tops of the four supports 2. The motor 4 is bolted to the top of the base 1, and the output shaft of the motor 4 is rotatably connected to the heating dish 3. A stirring blade 5 is bolted to the upper part of the output shaft of the motor 4, and the stirring blade 5 is located inside the heating dish 3. The discharge pipe 6 is connected to the bottom of the heating dish 3 via a flange, and the heating dish 3 communicates with the discharge pipe 6. Two hot air blowers 7 are bolted to the top of the base 1, and the two hot air blowers 7 are symmetrically arranged. Sliding mounting feet 8 are bolted to the top of the base 1, and the heating component is mounted on the sliding mounting feet 8. The feeding component is mounted on the base 1.

[0029] The heating component includes a sliding rod 91, a heating resistance wire 92, and a cam 93. The sliding rod 91 is slidably connected to the sliding mounting leg 8. The lower part of the sliding rod 91 is provided with a spherical protrusion. The heating resistance wire 92 is fixedly connected to the sliding rod 91 and is wound around the heating dish 3. The lower part of the output shaft of the motor 4 is fixedly connected to the cam 93. The top of the cam 93 is provided with several hemispherical protrusions. The cam 93 is located below the heating dish 3, and the spherical protrusion at the lower part of the sliding rod 91 is located above the cam 93.

[0030] The feeding component includes mounting feet 101, mounting feet 102, sliding rods 103, feeding plates 104, and top blocks 105. Two mounting feet 101 are bolted to the top of the base 1, and the two mounting feet 101 are symmetrically arranged. Two mounting feet 102 are bolted to the top of the base 1, and the two mounting feet 102 are symmetrically arranged. Sliding rods 103 are riveted to each of the two mounting feet 101. The ends of the two sliding rods 103 away from the mounting feet 101 are fixedly connected to the two mounting feet 102 respectively. The feeding plate 104 is slidably connected between the two sliding rods 103. The top of the sliding rod 104 is bolted to the top of the top block 105, which has a pushing inclined surface that contacts the bottom of the feeding plate 104.

[0031] First, the operator places an appropriate amount of silicone balls on the feeding plate 104. Then, the operator starts the motor 4 and two hot air blowers 7, and energizes the heating resistance wire 92. The two hot air blowers 7 dry the silicone balls on the feeding plate 104, and the heating resistance wire 92 heats the heating dish 3. The output shaft of the motor 4 rotates, causing the cam 93 and the stirring blade 5 to rotate. One of the hemispherical protrusions on the cam 93 contacts the spherical protrusion at the bottom of the sliding rod 91, and the hemispherical protrusion on the cam 93 squeezes the sliding rod 91. The spherical protrusion at the lower part of rod 91 moves upward. This upward movement of sliding rod 91 causes heating resistance wire 92 and top block 105 to move upward as well. The upward movement of top block 105 pushes feeding plate 104 diagonally upward. Then, the output shaft of motor 4 drives cam 93 and stirring blade 5 to continue rotating. One of the hemispherical protrusions on cam 93 disengages from the spherical protrusion at the lower part of sliding rod 91. Sliding rod 91 then moves downward to reset under gravity. This reset of sliding rod 91 causes heating resistance wire 92 and top block 105 to move downward. The moving and resetting mechanism, with the heating resistance wire 92 moving up and down, provides more even heating to the heating dish 3. The top block 105 no longer pushes the feeding plate 104, which moves downwards under gravity to reset. The up-and-down movement of the feeding plate 104 generates vibration, causing the silicone balls on it to fall into the heating dish 3. The silicone balls melt into liquid silicone within the heating dish 3, which is then discharged through the discharge pipe 6. The liquid silicone is collected and used by the staff, and this process is repeated. The overhead block 105 pushes the feeding plate 104 to move up and down repeatedly, generating vibration, which enables the silicone balls on the feeding plate 104 to be automatically unloaded, thereby making the preheating efficiency of the silicone balls higher. It also drives the heating resistance wire 92 to move up and down repeatedly through the sliding rod 91, which makes the heating dish 3 heat more evenly, and thus makes the silicone balls in the heating dish 3 melt more thoroughly, resulting in better quality of the silicone molds produced later. After the silicone balls are preheated, the operator will turn off the motor 4 and the two hot air blowers 7, and stop the power supply to the heating resistance wire 92.

[0032] Example 2: Based on Example 1, such as Figures 4-9As shown, it also includes a material storage component, which is mounted on the base 1. The material storage component includes a mounting bracket 111, a feeding hopper 112, a baffle 113, a return spring 114, and a push rod 115. The mounting bracket 111 is bolted to the top of the base 1. The feeding hopper 112 is bolted to the mounting bracket 111. The feeding hopper 112 has a discharge port at its bottom. The baffle 113 is rotatably connected to the bottom of the feeding hopper 112. The baffle 113 is located below the discharge port at the bottom of the feeding hopper 112. Two return springs 114 are connected to the baffle 113 and the feeding hopper 112 by hooks. Two push rods 115 are bolted to the upper part of the feeding plate 104. The two push rods 115 are symmetrically arranged and each push rod 115 is provided with a guide slope.

[0033] Initially, the hopper 112 contains a suitable amount of silicone balls. A baffle 113 is located below the hopper 112, blocking the discharge port at the bottom of the hopper 112. When the top block 105 pushes the feeding plate 104 to move obliquely upwards, the feeding plate 104 will cause both top rods 115 to move obliquely upwards. The baffle 113 will then contact the guide ramps on both top rods 115, causing the two top rods 115 to press the baffle 113 downwards. The return spring 114 will be stretched, and the baffle 113 will no longer block the discharge port at the bottom of the hopper 112. The silicone balls inside the hopper 112 will then roll downwards for discharge. When the feeding plate 104... When the feed plate 104 moves downwards under the influence of gravity, it will cause both push rods 115 to move downwards and reset. The baffle 113 will disengage from both push rods 115, and the reset spring 114 will reset. The reset spring 114 will cause the baffle 113 to swing upwards and reset. The baffle 113 will then block the discharge port at the bottom of the discharge hopper 112 again. In this way, by pushing the baffle 113 downwards with the two push rods 115 and causing the baffle 113 to swing upwards with the reset spring 114, the discharge port at the bottom of the discharge hopper 112 can be automatically opened and closed, thereby further improving the preheating efficiency of the silicone balls.

[0034] Example 3: Based on Example 2, such as Figure 7 and Figure 8 As shown, it also includes a sweeping component, which is disposed on the feeding hopper 112. The sweeping component includes a mounting rod 121, a main gear 122, a swing rod 123, and a fixed gear 124. The bottom of the feeding hopper 112 is bolted to the mounting rod 121, and the swing rod 123 is rotatably connected to the mounting rod 121. The lower part of the swing rod 123 is connected to the main gear 122 via a flat key. The top of the heating dish 3 is riveted to the fixed gear 124, and the main gear 122 meshes with the fixed gear 124.

[0035] When the top block 105 pushes the feeding plate 104 to move obliquely upward, the feeding plate 104 will drive the mounting rod 121 to move obliquely upward. The mounting rod 121 will drive the swing rod 123 to move obliquely upward, and the swing rod 123 will drive the main gear 122 to move obliquely upward. While moving obliquely upward, the main gear 122 will rotate under the action of the fixed gear 124. The rotation of the main gear 122 will drive the swing rod 123 to swing. The swing rod 123 will move the silicone ball on the feeding plate 104. When the feeding plate 104 moves obliquely downward and resets under the action of gravity, the feeding plate 104 will drive the mounting rod 121 to move obliquely downward and reset. The reset of the mounting rod 121 will drive the swing rod 123 to swing. When the rocker arm 123 moves diagonally downwards to reset, it will drive the main gear 122 to move diagonally downwards to reset. At the same time, the main gear 122 will rotate in the opposite direction under the action of the fixed gear 124. The reverse rotation of the main gear 122 will drive the rocker arm 123 to swing in the opposite direction. The rocker arm 123 will once again poke the silicone ball on the feeding plate 104. This process is repeated. By having the main gear 122 drive the rocker arm 123 to swing back and forth, the silicone ball on the feeding plate 104 can be poke more fully, reducing the occurrence of silicone ball blockage on the feeding plate 104. This allows the silicone ball to fall more smoothly into the heating dish 3 through the feeding plate 104, thus making the preheating of the silicone ball more efficient.

[0036] Example 4: Based on Example 3, such as Figure 6 and Figure 7 As shown, it also includes an arc-shaped toothed rod 13, a spur gear 14, and a rotating blade 15. The upper part of the rocker arm 123 is connected to the arc-shaped toothed rod 13 by rivets. Two spur gears 14 are rotatably connected to the feeding plate 104. The two spur gears 14 are symmetrically arranged. The arc-shaped toothed rod 13 meshes with both spur gears 14. The rotating blade 15 is connected to both spur gears 14 by rivets.

[0037] When the main gear 122 drives the rocker arm 123 to swing back and forth, the rocker arm 123 will drive the arc-shaped gear 13 to swing back and forth. The swinging of the arc-shaped gear 13 will drive the two spur gears 14 to rotate back and forth. The rotation of the two spur gears 14 will drive the two rotating blades 15 to swing back and forth. The two rotating blades 15 will agitate the silicone balls on the feeding plate 104, which can more fully agitate the silicone balls on the feeding plate 104, further reducing the occurrence of silicone balls clogging on the feeding plate 104, so that the silicone balls can fall more smoothly into the heating dish 3 through the feeding plate 104, thereby making the preheating of the silicone balls more efficient.

[0038] Example 5: Based on Example 4, such as Figure 9 and Figure 10 As shown, it also includes a clamping plate 16, which is connected between the tops of the two top rods 115 by rivets. The clamping plate 16 is slidably connected to the discharge hopper 112.

[0039] When the top block 105 pushes the feeding plate 104 to move obliquely upward, the feeding plate 104 will drive the clamping plate 16 to move obliquely upward. The clamping plate 16 will block the discharge port at the bottom of the discharge hopper 112. When the feeding plate 104 moves obliquely downward and resets under the action of gravity, the feeding plate 104 will drive the clamping plate 16 to move obliquely downward and reset. The clamping plate 16 will no longer block part of the discharge port at the bottom of the discharge hopper 112. In this way, by blocking the discharge port at the bottom of the discharge hopper 112 by the clamping plate 16, the number of silicone balls falling into the discharge hopper 112 each time is consistent, thereby realizing quantitative feeding and facilitating sufficient preheating of the silicone balls.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A preheating device for manufacturing silicone molds for telephone parts, characterized in that: The device includes a base (1), a bracket (2), a heating dish (3), a motor (4), a stirring blade (5), a discharge pipe (6), a hot air blower (7), a sliding mounting foot (8), a heating component, and a feeding component. The top of the base (1) is fixedly connected to four brackets (2), and the top of the four brackets (2) is fixedly connected to the heating dish (3). The top of the base (1) is fixedly connected to a motor (4), and the output shaft of the motor (4) is rotatably connected to the heating dish (3). The upper part of the output shaft of the motor (4) is fixedly connected to a stirring blade (5), which is located inside the heating dish (3). The bottom of the heating dish (3) is fixedly connected to a discharge pipe (6), and the heating dish (3) communicates with the discharge pipe (6). The top of the base (1) is fixedly connected to two hot air blowers (7), which are symmetrically arranged. The top of the base (1) is fixedly connected to a sliding mounting foot (8), and the heating component is mounted on the sliding mounting foot (8). The feeding component is mounted on the base (1). The heating component includes a sliding rod (91), a heating resistance wire (92), and a cam (93). The sliding rod (91) is slidably connected to the sliding mounting foot (8). A spherical protrusion is provided at the lower part of the sliding rod (91). The heating resistance wire (92) is fixedly connected to the sliding rod (91). The heating resistance wire (92) is wound around the heating dish (3). The cam (93) is fixedly connected to the lower part of the output shaft of the motor (4). The cam (93) is located below the heating dish (3). The spherical protrusion at the lower part of the sliding rod (91) is located above the cam (93). The top of the convex disk (93) is provided with several hemispherical protrusions; The feeding component includes mounting feet 1 (101), mounting feet 2 (102), sliding rods (103), feeding plates (104), and top blocks (105). The top of the base (1) is fixedly connected to two mounting feet 1 (101), which are symmetrically arranged. The top of the base (1) is fixedly connected to two mounting feet 2 (102), which are symmetrically arranged. Sliding rods (103) are fixedly connected to each of the two mounting feet 1 (101). The ends of the two sliding rods (103) away from the mounting feet 1 (101) are fixedly connected to the two mounting feet 2 (102) respectively. The feeding plates (104) are slidably connected between the two sliding rods (103). The top of the sliding rods (91) is fixedly connected to the top of the top block (105). The top block (105) is provided with a pushing slope. The pushing slope on the top block (105) contacts the bottom of the feeding plates (104). It also includes a material storage component, which is set on the base (1). The material storage component includes a top rod (115). Two top rods (115) are fixedly connected to the upper part of the feeding plate (104). The two top rods (115) are symmetrically arranged, and both top rods (115) are provided with guide slopes. It also includes a clamping plate (16), which is fixedly connected between the tops of the two top rods (115), and the clamping plate (16) is slidably connected to the discharge hopper (112).

2. A preheating device for manufacturing silicone molds for telephone parts according to claim 1, characterized in that: The storage component also includes a mounting bracket (111), a feeding hopper (112), a baffle (113), and a return spring (114). The mounting bracket (111) is fixedly connected to the top of the base (1). The feeding hopper (112) is fixedly connected to the mounting bracket (111). The feeding hopper (112) has a discharge port at the bottom. The baffle (113) is rotatably connected to the bottom of the feeding hopper (112). The baffle (113) is located below the discharge port at the bottom of the feeding hopper (112). Two return springs (114) are connected between the baffle (113) and the feeding hopper (112).

3. A preheating device for manufacturing silicone molds for telephone parts according to claim 2, characterized in that: It also includes a sweeping component, which is set on the feeding hopper (112). The sweeping component includes a mounting rod (121), a main gear (122), a swing rod (123), and a fixed gear (124). The bottom of the feeding hopper (112) is fixedly connected to the mounting rod (121), the swing rod (123) is rotatably connected to the mounting rod (121), the lower part of the swing rod (123) is fixedly connected to the main gear (122), and the top of the heating dish (3) is fixedly connected to the fixed gear (124). The main gear (122) meshes with the fixed gear (124).

4. A preheating device for manufacturing silicone molds for telephone parts according to claim 3, characterized in that: It also includes an arc-shaped toothed rod (13), a spur gear (14) and a rotating blade (15). The upper part of the swing rod (123) is fixedly connected to the arc-shaped toothed rod (13). Two spur gears (14) are rotatably connected to the feeding plate (104). The two spur gears (14) are symmetrically arranged. The arc-shaped toothed rod (13) meshes with both spur gears (14). A rotating blade (15) is fixedly connected to both spur gears (14).

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