PET bottle crusher

Abstract

The utility model relates to the technical field of crushers, in particular to a PET (Polyethylene Terephthalate) bottle crusher, which comprises a case, a feed hopper, a knife roll assembly, a stationary knife and bolts, the feed hopper is arranged at the top end of the case, the knife roll assembly is arranged in the case, two inner walls of the case are respectively provided with a mounting seat, and the top surfaces of the mounting seats are in sliding connection with the bottom surface of the stationary knife. The mounting seat is in threaded connection with the bottom end of a bolt, the waist-shaped groove of the fixed cutter is in sliding fit with the bolt, the bottom surface of a nut of the bolt is in contact fit with the top surface of the fixed cutter, and after the cutter, namely the cutter roller assembly and the fixed cutter are abraded, the distance between the fixed cutter and the cutter roller assembly is adjusted through the bolt, so that a cutter gap meeting the cutting requirement is achieved; according to materials with low hardness, cutting points of the cutter and the materials are arranged in the middle of the machine box, high-hardness plastic can be crushed, and meanwhile, the situation that the materials are cut into powder and cannot be recycled to cause productivity waste can be avoided for the materials with low hardness.

Description

Technical Field

[0001] The utility model relates to the technical field of crushers, and particularly relates to a PET bottle crusher. Background Technique

[0002] A plastic bottle crusher is a machine specifically used for crushing various plastic bottles. This device crushes plastic bottles to facilitate the reuse and treatment of plastics, and plastic bottle crushers are widely used in various industries.

[0003] However, there are still deficiencies in the prior art. For example, a domestic waste miscellaneous plastic bottle crusher with the patent number CN201920593182.6 includes a crushing box body, a support frame, a left crushing mechanism, a right crushing mechanism, a feeding conveyor belt, and a storage pit. The left crushing mechanism includes a crushing drive motor, a left transmission sprocket, a right transmission sprocket, a transmission chain, a moving knife holder, and several rows of crushing moving knives. The left transmission sprocket is connected to the upper part of the output shaft of the crushing drive motor, the right transmission sprocket is connected to the moving knife holder, the transmission chain is respectively connected to the left and right transmission sprockets, and the crushing moving knives are evenly distributed obliquely on the moving knife holder. The right crushing mechanism includes a fixed knife holder and a row of crushing fixed knives. This device has a strong crushing ability for plastics with low hardness, but a large amount of material powder will be generated after crushing low-hardness materials, resulting in its inability to be recycled. Content of the Utility Model

[0004] The purpose of the utility model is to provide a PET bottle crusher to solve the situation proposed in the background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a PET bottle crusher, including: a machine case, a feeding hopper, a knife roller assembly, a fixed knife, and bolts. The feeding hopper is installed at the top of the machine case, the knife roller assembly is installed inside the machine case, an installation seat is provided on each of the two inner walls of the machine case, the top surface of the installation seat is slidably connected to the bottom surface of the fixed knife, the bottom end of the bolt is threadedly connected to the installation seat, the waist-shaped groove of the fixed knife is slidably matched with the bolt, and the bottom surface of the nut of the bolt is in contact with the top surface of the fixed knife.

[0006] Preferably, a baffle is installed on the inner wall of the feeding hopper, and the baffle is arranged above the knife roller assembly.

[0007] Preferably, the knife roller assembly includes: a roller shaft, moving knives, and a power assembly. The roller shaft is rotatably connected inside the machine case, and a plurality of moving knives are installed on the roller shaft, and the cutting ends of the moving knives are arranged towards the fixed knife.

[0008] Preferably, an inlet is provided at the top of the feeding hopper, the cutting ends of the moving knives are far away from the inlet, and the cutting ends of the fixed knives are arranged towards the cutting ends of the moving knives.

[0009] Preferably, a screen is provided below the moving knife, an outlet is provided at the bottom end of the machine case, and the output end of the screen faces the outlet.

[0010] Preferably, the bottom end of an opening and closing rod is hinged to the side of the machine case, and the top end of the opening and closing rod is connected to the side of the feed hopper through the second bolt.

[0011] Preferably, a flywheel is installed at the end of the roller shaft. The flywheel is arranged outside one end of the machine case, and a flywheel cover is provided on the machine case to protect the flywheel.

[0012] Preferably, it further includes a power assembly. The power assembly includes: a belt pulley, a narrow V-belt, and a belt cover. The other end of the roller shaft is equipped with a belt pulley. The belt pulley is arranged outside the other end of the machine case. The belt pulley is in transmission connection with a second belt pulley through the narrow V-belt. The second belt pulley is installed at the output end of the motor. The motor is installed on the machine case, and the machine case is equipped with a belt cover to protect the belt pulley, the second belt pulley, and the narrow V-belt.

[0013] Preferably, a rotating shaft is rotatably connected inside the machine case. The axis of the rotating shaft is parallel to the axis of the screen. Brush hairs are spirally arranged on the rotating shaft. The brush hairs are in frictional cooperation with the bottom surface of the screen. A turntable is installed on the rotating shaft. A plurality of convex blocks are installed on the side wall of the turntable. The convex blocks are in rolling cooperation with the bottom surface of the screen. The rotating shaft is connected to the output end of a power member. The power member is installed on the machine case.

[0014] Preferably, the power member includes: a second motor and a gear. The second motor is installed outside the machine case. The output end of the second motor is equipped with a second rotating shaft. The second rotating shaft is in rotational cooperation with a circular hole on the machine case. The end of the second rotating shaft placed inside the machine case is equipped with a second gear. The second gear is meshed and connected with the gear. The gear is sleeved on the rotating shaft.

[0015] The beneficial effects of the present utility model are as follows:

[0016] After the tool is worn, that is, after the cutter roller assembly and the fixed knife are worn, the distance between the fixed knife and the cutter roller assembly is adjusted through bolts to achieve the tool clearance that meets the required chip requirements. For materials with lower hardness, the chip point of the tool and the material is set in the middle of the machine case, which can meet the requirement of crushing high-hardness plastics. At the same time, for materials with lower hardness, it can avoid the waste of production capacity caused by the chips of the materials becoming powder and being unable to be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the front view of the main body of the present utility model;

[0018] Figure 2 is the present utility model Figure 1 the sectional view in the A-A direction;

[0019] Figure 3 is the present utility model Figure 2 the partial enlarged view at A;

[0020] Figure 4 Schematic diagram of the waist-shaped groove of the present utility model in cooperation with the bolt

[0021] Figure 5 Schematic diagram of the opening and closing rod structure of the present utility model

[0022] Figure 6 Schematic diagram of the installation position of the narrow V-belt of the present utility model

[0023] Figure 7 Schematic diagram of the installation position of the brush bristles of the present utility model

[0024] In the figure: chassis 1, feed hopper 2, cutter roller assembly 3, fixed knife 4, bolt 5, baffle 6, roller shaft 7, moving knife 8, power assembly 9, screen 10, opening and closing rod 11, flywheel cover 12, pulley 13, narrow V-belt 14, belt cover 15, brush bristles 16, convex block 17, second motor 18, gear 19 Specific embodiments

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances

[0027] Example 1: Refer to Figure 1 - Figure 5 , a PET bottle crusher, comprising: a chassis 1, a feed hopper 2, a cutter roller assembly 3, a fixed knife 4 and a bolt 5. The feed hopper 2 is installed at the top of the chassis 1, the cutter roller assembly 3 is installed inside the chassis 1, an installation seat is provided on each of the two inner walls of the chassis 1, the top surface of the installation seat is slidably connected to the bottom surface of the fixed knife 4, the bottom end of the bolt 5 is threadedly connected to the installation seat, the waist-shaped groove of the fixed knife 4 is slidably matched with the bolt 5, and the bottom surface of the nut of the bolt 5 is in contact and cooperation with the top surface of the fixed knife 4

[0028] The principle of the above solution is

[0029] Put the plastic bottles into the feed hopper 2, start the knife roller assembly 3 to rotate, and the knife roller assembly 3 and the fixed knife 4 cooperate to crush the plastic bottles;

[0030] When the hardness of the plastic bottle is large, loosen the bolt 5, move the fixed knife 4 toward the direction of the knife roller assembly 3, the waist groove on the fixed knife 4 slides with the bolt 5, and after the fixed knife 4 moves into place, tighten the bolt 5 so that the bottom surface of the nut contacts and contacts the top surface of the fixed knife 4, and the bottom surface of the fixed knife 4 contacts and contacts the top surface of the mounting seat;

[0031] When the hardness of the plastic bottle is low, loosen the bolt 5 and move the fixed knife 4 away from the knife roller assembly 3. The waist groove on the fixed knife 4 slides with the bolt 5. After the fixed knife 4 moves into place, tighten the bolt 5 so that the bottom surface of its nut contacts and contacts the top surface of the fixed knife 4, and the bottom surface of the fixed knife 4 contacts and contacts the top surface of the mounting seat.

[0032] The beneficial effects of the above scheme are:

[0033] By providing a waist-shaped groove on the fixed knife 4, the waist-shaped groove and the bolt 5 are slidably matched, and the bottom surface of the nut and the top surface of the mounting seat are matched to clamp the fixed knife 4, thereby improving the stability of the fixed knife 4 during operation;

[0034] After the tool is worn, that is, after the knife roller assembly 3 and the fixed knife 4 are worn, the distance between the fixed knife 4 and the knife roller assembly 3 is adjusted by the bolt 5 to achieve a tool clearance that meets the required chipping requirements. For materials with lower hardness, the chipping point between the tool and the material is set in the middle of the chassis 1 to meet the crushing of high-hardness plastics. At the same time, for materials with low hardness, it can avoid the waste of production capacity caused by the material chips being cut into powder and unable to be recycled.

[0035] Example 2: Reference Figure 2 The inner wall of the feed hopper 2 is provided with a baffle 6 , and the baffle 6 is arranged above the knife roller assembly 3 .

[0036] The bottom surface of the baffle plate 6 is arranged toward the knife roller assembly 3 , the top end of the baffle plate 6 is connected to the bottom end of the extension plate, the top surface of the baffle plate 6 is arranged toward the inlet, and the top end of the extension plate is installed on the inner wall of the feed hopper 2 .

[0037] The principle of the above scheme is:

[0038] When the plastic bottles move toward the knife roller assembly 3 in the feed hopper 2, the plastic bottles contact the inner wall of the feed hopper 2 and the extension plate in turn under the action of gravity, and then fall onto the knife roller assembly 3. Some plastic bottles will be bounced up after colliding with the knife roller assembly 3, and the bounced plastic bottles will be rebounded by the baffle 6 and fall onto the knife roller assembly 3 again.

[0039] The beneficial effects of the above scheme are:

[0040] A baffle 6 is arranged in the feed hopper 2, which can prevent the plastic bottles rebounded by the cutter roller assembly 3 from being ejected outside the feed hopper 2, improving the safety of the device during production.

[0041] Embodiment 3: Refer to Figure 2 and Figure 3 , the cutter roller assembly 3 includes: a roller shaft 7, moving knives 8 and a power assembly 9. The roller shaft 7 is rotatably connected in the chassis 1, and a plurality of moving knives 8 are installed on the roller shaft 7, and the cutting ends of the moving knives 8 are arranged towards the fixed knife 4.

[0042] The principle of the above solution is:

[0043] When crushing plastic bottles, start the power assembly 9, and the power assembly 9 drives the roller shaft 7 and the moving knives 8 to rotate. The rotating moving knives 8 cooperate with the fixed knife 4 to crush the plastic bottles.

[0044] The beneficial effects of the above solution are:

[0045] A plurality of moving knives 8 are arranged on the roller shaft 7, and the moving knives 8 cooperate with the fixed knife 4 to crush the plastic bottles, simplifying the complexity of the device.

[0046] Embodiment 4: Refer to Figure 2 and Figure 3 , the top of the feed hopper 2 is provided with an inlet, the cutting end of the moving knife 8 is arranged away from the inlet, and the cutting end of the fixed knife 4 is arranged towards the cutting end of the moving knife 8.

[0047] The principle of the above solution is:

[0048] Before crushing the plastic bottles, the plastic bottles are uniformly put in through the inlet. The plastic bottles fall onto the moving knives 8 from top to bottom, and the plastic bottles are moved by the rotation of the moving knives 8. When crushing the plastic bottles, due to the cutting end of the moving knife 8 away from the inlet and the cutting end of the moving knife 8 facing the fixed knife 4, the moving direction of the plastic bottles in the device is the same as the rotation direction of the roller shaft 7 and the moving knives 8. The moving knives 8 cooperate with the fixed knife 4 to crush the plastic bottles.

[0049] The beneficial effects of the above solution are:

[0050] By setting the moving direction of the plastic bottles in the device to be the same as the rotation direction of the roller shaft 7 and the moving knives 8 when crushing the plastic bottles, it prevents the plastic bottles from being thrown out of the device, and further improves the safety of the device in cooperation with the baffle 6.

[0051] Embodiment 5: Refer to Figure 2 and Figure 7 , a screen 10 is arranged below the moving knife 8, an outlet is arranged at the bottom end of the chassis 1, and the output end of the screen 10 is arranged towards the outlet.

[0052] The principle of the above solution is:

[0053] After the plastic bottle is crushed, crushed plastic and uncrushed plastic are formed. The crushed plastic is discharged outside the device through the screen 10 and the outlet discharging device. The remaining uncrushed plastic is driven by the moving knife 8 and guided by the screen 10 to move to the cutting end of another fixed knife 4. The other fixed knife 4 and the moving knife 8 cooperate to crush the uncrushed plastic again to form crushed plastic, and finally, through the guidance of the moving knife 8, it is discharged outside the device through the screen 10 and the outlet discharging device.

[0054] The beneficial effects of the above solution are as follows:

[0055] By arranging the screen 10 under the moving knife 8, the uncrushed plastic is blocked by the screen 10, the crushed plastic of qualified size is screened and discharged outside the device, and the uncrushed plastic is prevented from being directly discharged outside the device through the outlet, which improves the crushing effect of the device on the plastic bottle and unifies the volume of the crushed plastic.

[0056] Example Six: Refer to Figure 1 and Figure 5 , the bottom end of the opening and closing rod 11 is hinged to the side of the chassis 1, and the top end of the opening and closing rod 11 is connected to the side of the feeding hopper 2 through the second bolt.

[0057] The principle of the above solution is as follows:

[0058] After the feeding hopper 2 is installed on the chassis 1, its side is connected to the top end of the opening and closing rod 11 through the second bolt, and the bottom end of the opening and closing rod 11 is hinged to the side of the chassis 1.

[0059] The beneficial effects of the above solution are as follows:

[0060] By arranging the opening and closing rod 11 between the chassis 1 and the feeding hopper 2, the opening and closing rod 11 fixes the chassis 1 and the feeding hopper 2, improving the stability of the device after installation.

[0061] Example Seven: Refer to Figure 5 and Figure 6 , a flywheel is installed at the end of the roller shaft 7. The flywheel is arranged outside one end of the chassis 1, and a flywheel cover 12 is provided on the chassis 1 to protect the flywheel.

[0062] The principle of the above solution is as follows:

[0063] When the roller shaft 7 rotates, the flywheel at its end rotates synchronously.

[0064] The beneficial effects of the above solution are as follows:

[0065] By installing a flywheel at the end of the roller shaft 7, additional resistance can be provided for the roller shaft 7 to prevent the roller shaft 7 from rotating too fast, and at the same time, the stability of the roller shaft 7 during rotation can be improved; the flywheel cover protects the rotating flywheel from being contaminated by debris or hurting the operator.

[0066] Example Eight: Reference Figure 1 , Figure 2 , Figure 3 and Figure 6 , and further includes a power assembly 9, the power assembly 9 includes: a pulley 13, a narrow V-belt 14 and a belt cover 15. The other end of the roller shaft 7 is equipped with the pulley 13, and the pulley 13 is arranged outside the other end of the chassis 1. The pulley 13 is drivingly connected to the second pulley through the narrow V-belt 14. The second pulley is installed at the output end of the motor, the motor is installed on the chassis 1, and the chassis 1 is equipped with the belt cover 15 to protect the pulley 13, the second pulley and the narrow V-belt 14.

[0067] The principle of the above solution is as follows:

[0068] When it is necessary to rotate the roller shaft 7, start the motor to drive the second pulley to rotate. The second pulley is drivingly connected to the pulley 13 through the narrow V-belt 14. The pulley 13 rotates synchronously with the second pulley, and the pulley 13 drives the roller shaft 7 to rotate. The rotating pulley 13, the second pulley and the narrow V-belt 14 are protected by the belt cover 15, and the belt cover 15 is installed on the chassis 1.

[0069] The beneficial effects of the above solution are as follows:

[0070] The motor drives the second pulley to rotate. The second pulley is drivingly connected to the pulley 13 through the narrow V-belt 14, improving the synchronous movement effect of the device; the belt cover 15 is used to protect the pulley 13, the second pulley and the narrow V-belt 14, preventing dust from falling onto the pulley 13, the second pulley and the narrow V-belt 14, and at the same time preventing the pulley 13, the second pulley and the narrow V-belt 14 from contacting the operator, improving the safety of the operator.

[0071] Example Nine: Reference Figure 7 , a rotating shaft is rotatably connected in the chassis 1, the axis of the rotating shaft is parallel to the axis of the screen 10, bristles 16 are spirally arranged on the rotating shaft, the bristles 16 are in frictional cooperation with the bottom surface of the screen 10, a turntable is installed on the rotating shaft, and a plurality of bumps 17 are installed on the side wall of the turntable. The bumps 17 are in rolling cooperation with the bottom surface of the screen 10. The rotating shaft is connected to the output end of the power member, and the power member is installed on the chassis 1.

[0072] The power member includes: a second motor 18 and a gear 19. The second motor 18 is installed outside the chassis 1. The output end of the second motor 18 is equipped with a second rotating shaft, and the second rotating shaft is rotatably fitted with the circular hole on the chassis 1. The end of the second rotating shaft placed inside the chassis 1 is equipped with a second gear, and the second gear is meshingly connected with the gear 19. The gear 19 is sleeved on the rotating shaft.

[0073] The principle of the above solution is as follows:

[0074] After the device crushes plastic bottles, due to the large volume of uncrushed plastics, it is easy to be guided by the moving knife 8 and move along the top surface of the screen 10. However, some crushed plastics will accumulate at the bottom of the screen 10, causing blockage of the mesh holes of the screen 10. Start the second motor 18 to rotate forward. The second motor 18 drives the second rotating shaft and the second gear to rotate forward. The second gear drives the engaged gear 19 to rotate in reverse. The gear 19 drives the rotating shaft, the brush 16, the turntable and the convex block 17 to rotate in reverse synchronously. Then start the second motor 18 to rotate in reverse. The second motor 18 drives the second rotating shaft and the second gear to rotate in reverse. The second gear drives the engaged gear 19 to rotate forward. The gear 19 drives the rotating shaft, the brush 16, the turntable and the convex block 17 to rotate forward synchronously. The rotating brush 16 cleans the bottom end of the screen 10. The brush 16 extending into the mesh holes of the screen 10 pushes up the crushed plastics blocking the mesh holes to the top surface of the screen 10. The convex block 17 rollingly mating with the bottom surface of the screen 10 vibrates the screen 10. The brush 16 and the convex block 17 cooperate with each other to clean the crushed plastics in the mesh holes and adjust their positions on the top surface of the screen 10, unclogging the blocked mesh holes.

[0075] The beneficial effects of the above solution are as follows:

[0076] Since the brush 16 is designed in a spiral shape, when the brush 16 cleans the mesh holes of the screen 10, the contact mode between a single mesh hole and the brush 16 is intermittent. After the brush cleans a single mesh hole, the cleaning of the mesh hole immediately ends, enabling the crushed plastics in the mesh hole to be quickly discharged. The convex block 17 is arranged to rollingly mate with the bottom surface of the screen 10, which can assist in vibrating the crushed plastics after cleaning and improve the cleaning efficiency of the mesh holes. When there is too much crushed plastics accumulated on the screen 10, control the brush 16 to rotate forward and reverse alternately, increasing the cleaning frequency of a single mesh hole. Without replacing the second motor with a higher power, the cleaning effect can be improved.

[0077] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A PET bottle crusher, characterized in that, include: A chassis (1) is provided with a feed hopper (2) at the top of the chassis (1), a knife roller assembly (3) is provided inside the chassis (1), a mounting seat is provided on each of the two inner walls of the chassis (1), the top surface of the mounting seat is slidably connected to the bottom surface of a fixed knife (4), the bottom end of a bolt (5) is threadedly connected to the mounting seat, the waist groove of the fixed knife (4) is slidably matched with the bolt (5), and the bottom surface of the nut of the bolt (5) is in contact with the top surface of the fixed knife (4).

2. The PET bottle crusher according to claim 1, characterized in that, The inner wall of the feed hopper (2) is provided with a baffle (6), and the baffle (6) is arranged above the knife roller assembly (3).

3. A PET bottle crusher according to claim 2, characterized in that, The knife roller assembly (3) comprises: a roller shaft (7), the roller shaft (7) is rotatably connected in the chassis (1), a plurality of movable knives (8) are mounted on the roller shaft (7), and the cutting ends of the movable knives (8) are arranged toward the fixed knives (4).

4. A PET bottle crusher according to claim 3, characterized in that, An inlet is arranged at the top of the feed hopper (2), the cutting end of the movable knife (8) is arranged away from the inlet, and the cutting end of the fixed knife (4) is arranged toward the cutting end of the movable knife (8).

5. The PET bottle crusher according to claim 4, wherein, A screen (10) is provided under the movable knife (8), an outlet is provided at the bottom end of the chassis (1), and an output end of the screen (10) is arranged toward the outlet.

6. A PET bottle crusher according to claim 5, characterized in that, The bottom end of an opening and closing rod (11) is hingedly connected to the side of the chassis (1), and the top end of the opening and closing rod (11) is connected to the side of the feed hopper (2) via bolt 2.

7. A PET bottle crusher according to claim 6, characterized in that, A flywheel is mounted at the end of the roller shaft (7), and the flywheel is arranged outside one end of the chassis (1). A flywheel cover (12) is provided on the chassis (1) to protect the flywheel.

8. A PET bottle crusher according to claim 7, characterized in that, The invention also comprises a power assembly (9), wherein the power assembly (9) comprises: a pulley (13), the other end of the roller shaft (7) is provided with the pulley (13), the pulley (13) is arranged outside the other end of the chassis (1), the pulley (13) is connected to the second pulley through a narrow V-belt (14), the second pulley is installed at the output end of the motor, the motor is installed on the chassis (1), and the chassis (1) is provided with a belt cover (15) to protect the pulley (13), the second pulley and the narrow V-belt (14).

9. A PET bottle crusher according to claim 8, characterized in that, A rotating shaft is rotatably connected inside the chassis (1), the axis of the rotating shaft is arranged parallel to the axis of the screen (10), bristles (16) are spirally arranged on the rotating shaft, the bristles (16) are frictionally engaged with the bottom surface of the screen (10), a rotating disk is arranged on the rotating shaft, a plurality of protrusions (17) are arranged on the side wall of the rotating disk, the protrusions (17) are rollingly engaged with the bottom surface of the screen (10), the rotating shaft is connected to the output end of a power component, and the power component is installed on the chassis (1).

10. A PET bottle crusher according to claim 9, characterized in that, The power part comprises: a second motor (18) and a gear (19). The second motor (18) is mounted outside the chassis (1). The output end of the second motor (18) is equipped with a second rotating shaft. The second rotating shaft is rotatably matched with a round hole on the chassis (1). The end of the second rotating shaft placed inside the chassis (1) is equipped with a second gear. The second gear is meshed and connected with the gear (19). The gear (19) is sleeved on the rotating shaft.

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