Plastic barrel carrier
By designing a clamping assembly and movement mechanism for plastic barrels, the problem of easy deformation of plastic barrels during handling is solved, and stable clamping and efficient transportation are achieved.
Patent Information
- Application Number
- CN202421015331.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-05-10
AI Technical Summary
In the prior art, plastic barrels are prone to deformation due to collision or extrusion during handling.
A plastic bucket transport truck is designed, and a clamping assembly is used to clamp the plastic bucket between the first clamp, the second clamp and the third clamp, and stable clamping of the plastic bucket is achieved by driving the second clamp and the third clamp to move along the width direction of the transportation base.
It effectively prevents collision and extrusion of plastic barrels during transportation, avoids deformation, and can clamp multiple plastic barrels at the same time, improving transportation efficiency.
Smart Images
Figure CN222905586U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of transportation equipment, and in particular to a plastic barrel carrier truck. Background Art
[0002] A plastic barrel is a container used for loading, storing, transporting, and handling substances such as liquids, powders, and granules. It is usually made of plastic materials such as polyethylene and polypropylene, and has the characteristics of being lightweight, strong, corrosion-resistant, and easy to clean.
[0003] In the related art, a handling device, for example, a utility model with the authorized publication number of CN2021234417598, relates to a thermal cleaning trolley for loading synthetic resin barrels, including a base, a mounting member provided on the base, and a mounting member provided thereon. During handling, multiple barrels are placed on the trolley and the trolley is pushed to move.
[0004] However, in the handling device in the related art, when handling plastic barrels, the collision of the plastic barrels when placed on the chassis or during transportation is likely to cause the plastic barrels to deform. Utility Model Content
[0005] In order to improve the problem that when handling existing plastic barrels, the collision of the plastic barrels when placed on the chassis or during transportation is likely to cause the plastic barrels to deform, this application provides a plastic barrel handling device that is not prone to collision during transportation and thus not prone to deformation.
[0006] A plastic barrel carrier truck provided by this application adopts the following technical solution:
[0007] A plastic barrel carrier truck includes a transportation base, and a clamping assembly is provided on the transportation base. The clamping assembly includes a first clamping block slidably provided on the transportation base, and a second clamping block and a third clamping block are slidably provided on the first clamping block. The first clamping block includes a first sliding portion, a clamping portion, and a second sliding portion sequentially arranged from one end to the other end. Both the first sliding portion and the second sliding portion are slidably engaged with the transportation base;
[0008] The clamping portion of the first clamping block is provided with a first clamping groove. The plurality of first clamping grooves are divided into two groups. The two groups of first clamping grooves are respectively oriented towards the second clamping block and the third clamping block. The side of the second clamping block close to the first clamping block is provided with a second clamping groove. The number of the second clamping grooves is the same as that of one group of first clamping grooves. The plurality of second clamping grooves correspond to the plurality of first clamping grooves in one group one by one. When the plastic bucket is driven between the first clamping groove and the second clamping groove, by driving the second clamping block close to the first clamping block, the plastic bucket is clamped by the second clamping groove and the first clamping groove. The side of the third clamping block close to the first clamping block is provided with a third clamping groove. The third clamping groove is basically the same as the second clamping groove. When the plastic bucket is driven between the first clamping groove and the third clamping groove, by driving the third clamping block close to the first clamping block, the plastic bucket is clamped by the third clamping groove and the first clamping groove.
[0009] By adopting the above technical solution, during transportation, by placing a plurality of plastic buckets between the first clamping block, the second clamping block and the third clamping block, making the plastic bucket located between the first clamping groove and the second clamping groove, or located between the first clamping groove and the third clamping groove, by driving the second clamping block to move in the direction close to the first clamping block, and at the same time making the third clamping block move in the direction close to the first clamping block, so as to clamp a plurality of plastic buckets, and then transportation can be carried out, thereby preventing the plastic buckets from colliding or being squeezed during transportation and preventing deformation.
[0010] Preferably, a plurality of sets of the clamping assemblies are provided, and the plurality of sets of clamping assemblies are arranged at intervals along the height direction of the guardrail.
[0011] By adopting the above technical solution, thus, through a plurality of sets of clamping assemblies, more plastic buckets can be clamped and fixed at the same time.
[0012] Preferably, a driving rack is further provided on the second clamping block. The driving rack is distributed along the direction in which the second clamping block approaches or departs from the first clamping block. One end of the driving rack is close to the third clamping block. A driven rack is provided on the third clamping block. The driven rack is parallel to the driving rack, and the tooth ends of the driven rack and the driving rack face each other. A gear is rotatably provided on the first clamping block. The gear is located between the driving rack and the driven rack, and the gear meshes with the driving rack and the driven rack.
[0013] By adopting the above technical solution, thus, by driving the second clamping block to move along the width direction of the bottom plate, making the second clamping block close to the first clamping block, at the same time, driving the driving rack to move, the gear can be driven to rotate. The gear drives the driven rack to move, so as to drive the third clamping block to move along the width direction of the bottom plate, making the third clamping block close to the first clamping block, and then only by driving the second clamping block to move, a plurality of plastic buckets can be clamped at the same time.
[0014] Preferably, two active racks are provided, and the two active racks are respectively located on both sides of the second clamping block, and two auxiliary racks are provided corresponding to the number of active racks, and the two auxiliary racks are respectively provided on both sides of the third clamping block, and the tooth ends of the two auxiliary racks are correspondingly facing the tooth ends of the two active racks, and two gears are also correspondingly provided, and the two gears are meshed with the two active racks one by one, and the two gears are also meshed with the two auxiliary racks one by one.
[0015] By adopting the above technical solution, the second clamping block is driven to move in a direction close to the first clamping block, and the active racks on both sides are driven to move at the same time. The active racks on both sides drive the two gears to rotate, and the two gears drive the two auxiliary racks to move, which is conducive to making the clamping process more stable.
[0016] Preferably, the transport base includes a bottom plate arranged in a rectangular shape, a rotating wheel arranged on one side of the bottom plate, and a guardrail arranged on the bottom plate away from the rotating wheel. A cross seat is arranged on the guardrail, and the cross seat is parallel to the bottom plate. Two of the cross seats form a group, and the two cross seats in a group are respectively slidably matched with the first sliding part and the second sliding part of the first clamping block. Multiple groups are arranged on the guardrail corresponding to the number of clamping components, and the multiple groups of cross seats are parallel along the height direction of the guardrail.
[0017] By adopting the above technical solution, multiple groups of horizontal seats can be used to specially set up multiple groups of clamping components, so as to clamp more plastic barrels.
[0018] Preferably, a plurality of the rotating wheels are provided, and the plurality of the rotating wheels are equally divided into two groups, the two groups of the rotating wheels are respectively provided on two opposite sides of the bottom plate, and the rotating wheels in one group are distributed at intervals along one side of the bottom plate.
[0019] By adopting the above technical solution, the moving process can be made more stable through the joint action of multiple wheels.
[0020] Preferably, the rotating wheel comprises a universal wheel.
[0021] By adopting the above technical solution, the universal wheel is conducive to driving the bottom plate and the guardrail to move in multiple directions, so as to provide greater maneuverability and flexibility.
[0022] Preferably, the guardrail is perpendicular to the bottom plate, the guardrail is arranged around three sides of the base, a switch door is hinged on the guardrail, the switch door is close to the opening side of the base, one side of the switch door is hinged to the guardrail through a hinge axis, and a latch for locking the switch door is provided on the side of the switch door away from the hinge axis. When the first clamp block, the second clamp block and the third clamp block clamp the plastic barrel, the switch door is driven to rotate along the hinge axis and locked by the latch, so that the first clamp block, the second clamp block and the third clamp block can keep clamping the plastic barrel.
[0023] By adopting the above technical solution, when the first clamping block, the second clamping block and the third clamping block clamp the plastic barrel, by driving the switch door to rotate along the hinge axis and locking the switch door with a bolt, the first clamping block, the second clamping block and the third clamping block can be kept clamping the plastic barrel, thereby preventing the plastic barrel from loosening during transportation.
[0024] In summary, the present application includes at least one of the following beneficial technical effects:
[0025] 1. During transportation, by placing a plurality of plastic barrels between the first clamping block, the second clamping block and the third clamping block, making the plastic barrel located between the first clamping groove and the second clamping groove, or between the first clamping groove and the third clamping groove, by driving the second clamping block to move in the direction close to the first clamping block, and at the same time making the third clamping block move in the direction close to the first clamping block, so as to clamp a plurality of plastic barrels, and then transportation can be carried out, thereby preventing the plastic barrels from colliding or squeezing during transportation and preventing deformation;
[0026] 2. By driving the second clamping block to move in the width direction of the bottom plate, making the second clamping block close to the first clamping block, at the same time, driving the active rack to move, the gear can be driven to rotate, and the gear drives the auxiliary rack to move, thereby driving the third clamping block to move in the width direction of the bottom plate, making the third clamping block close to the first clamping block, so that only by driving the second clamping block to move, a plurality of plastic barrels can be clamped at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application.
[0028] Figure 2 is a schematic diagram of the structure in the open state of the switch door in an embodiment of the present application.
[0029] Figure 3 is an exploded view of the relationship between the clamping assembly and the transportation base in an embodiment of the present application.
[0030] Figure 4 is a schematic diagram of the structure of the clamping assembly in an embodiment of the present application.
[0031] Figure 5 is an exploded view of the relationship of the clamping assembly in an embodiment of the present application.
[0032] Figure 6 is a schematic diagram of the clamping state of the clamping assembly in an embodiment of the present application.
[0033] Explanation of the reference numerals: 1. transport base; 11. bottom plate; 12. rotating wheel; 13. guardrail; 2. opening and closing door; 3. plastic barrel; 4. horizontal seat; 5. first clamping block; 51. first sliding part; 52. clamping part; 521. first clamping groove; 53. second sliding part; 6. second clamping block; 61. second clamping groove; 7. third clamping block; 71. third clamping groove; 8. driving rack; 9. auxiliary rack; 10. gear. DETAILED DESCRIPTION
[0034] The following is combined with Figure 1-6 This application is described in further detail.
[0035] A plastic barrel transporter, referring to Figure 1 , including a transport base 1 and a clamping assembly arranged on the transport base 1. The transport base 1 includes a bottom plate 11 arranged in a rectangular shape, a rotating wheel 12 arranged on one side of the bottom plate 11, and a guardrail 13 arranged on the bottom plate 11 away from the rotating wheel 12. In this embodiment, the rotating wheel 12 is a universal wheel, which is conducive to driving the bottom plate 11 and the guardrail 13 to move in multiple directions to provide greater maneuverability and flexibility. There are multiple rotating wheels 12, and the multiple rotating wheels 12 are equally divided into two groups. The two groups of rotating wheels 12 are spaced apart along the width direction of the bottom plate 11, so that the moving process is more stable through the joint action of the multiple rotating wheels 12.
[0036] Reference Figure 1 or Figure 2 The guardrail 13 is perpendicular to the bottom plate 11, and the guardrail 13 is arranged around three sides of the base, so that one long side close to the base is open. The guardrail 13 is hinged with the switch door 2, and the switch door 2 is close to the open side of the base. One side of the switch door 2 is hinged with the guardrail 13 through a hinge axis, so that by driving the switch door 2 to rotate along the hinge axis, one side of the switch door 2 is driven away from or close to the guardrail 13, thereby opening or closing the open side. A latch (not shown in the figure) for closing the switch door 2 is provided on the side of the switch door 2 away from the hinge axis. The latch is a very mature technology in the prior art and will not be described in detail here. By closing the switch door 2 and locking it with the latch, the switch door 2 is prevented from shaking during transportation.
[0037] In this embodiment, refer to Figure 2 or Figure 3 The plastic barrel 3 is a cylindrical long barrel, and the plastic barrel 3 is set in a gradually narrowing closing shape from the middle to the two ends. During transportation, multiple plastic barrels 3 are clamped by a clamping assembly, and the clamping assembly is extended into the base.
[0038] Reference Figure 2 or Figure 3, a cross base 4 is provided on the guardrail 13. The cross base 4 is in a long strip shape and is parallel to the bottom plate 11. Two cross bases 4 form a group, and the two cross bases 4 in a group are arranged oppositely along the length direction of the bottom plate 11. Two groups of cross bases 4 are provided on the guardrail 13, and the two groups of cross bases 4 are parallel along the height direction of the guardrail 13.
[0039] Specifically, referring to Figure 3 or Figure 4 , the clamping assembly includes a first clamping block 5 slidably arranged on the cross base 4, a second clamping block 6 slidably arranged on the first clamping block 5, and a third clamping block 7 arranged oppositely to the second clamping block 6. Referring to Figure 4 , the first clamping block 5 is arranged in an I-shaped configuration. The first clamping block 5 includes a first sliding portion 51, a clamping portion 52, and a second sliding portion 53 arranged in sequence from one end to the other end. The first sliding portion 51 and the second sliding portion 53 are respectively in sliding fit with the two cross bases 4 in a group, so that the first clamping block 5 slides into or out of the guardrail 13. The clamping portion 52 of the first clamping block 5 is distributed along the length direction of the bottom plate 11, so that by driving the two ends of the first clamping block 5 to extend into the cross base 4, the first clamping block 5 extends into or out of the guardrail 13.
[0040] Referring to Figure 4 or Figure 5 , a first clamping groove 521 is formed in the clamping portion 52 of the first clamping block 5. The first clamping groove 521 penetrates through the upper and lower surfaces of the first clamping block 5 and is in an arc shape. Six first clamping grooves 521 are formed. The six first clamping grooves 521 are equally divided into two groups (three first clamping grooves 521 in a group), and the two groups of first clamping grooves 521 are oppositely formed along the width direction of the first clamping block 5. The three first clamping grooves 521 are equally spaced along the length direction of the first clamping groove 521.
[0041] Referring to Figure 4 or Figure 5 , the second clamping block 6 is slidably fitted to the first clamping block 5 along the width direction of the bottom plate 11. The second clamping block 6 is in a long strip shape and is distributed along the length direction of the bottom plate 11. The second clamping block 6 is close to the switch door 2. A second clamping groove 61 is formed on the side of the second clamping block 6 close to the first clamping block 5. The second clamping groove 61 is also in an arc shape and penetrates through the upper and lower surfaces of the second clamping block 6. The second clamping groove 61 is formed corresponding to the number of a group of first clamping grooves 521, that is, three second clamping grooves 61 are formed. When the second clamping block 6 is driven to move along the width direction of the bottom plate 11, the second clamping block 6 approaches the first clamping block 5. At this time, the second clamping groove 61 and the first clamping groove 521 form a clamping cavity for clamping the plastic bucket 3, so as to clamp the plastic bucket 3. The three second clamping grooves 61 are in one-to-one correspondence and communicate with the three first clamping grooves 521 close to the second clamping groove 61, which is beneficial to clamping three plastic buckets 3 by the first clamping block 5 and the second clamping block 6 at the same time.
[0042] Referring to Figure 4Or Figure 6 The third clamping block 7 is slidably fitted to the first clamping block 5 in the width direction of the bottom plate 11. The third clamping block 7 is arranged in a long strip shape and is distributed in the length direction of the bottom plate 11. Similarly, a third clamping groove 71 is formed on the side of the third clamping block 7 close to the first clamping block 5. The third clamping groove 71 is basically the same as the second clamping groove 61. When the third clamping block 7 is driven to move in the width direction of the bottom plate 11 so that the third clamping groove 71 communicates with the first clamping groove 521, the three third clamping grooves 71 are in one-to-one correspondence with and communicate with three first clamping grooves 521 close to the third clamping groove 71, which is beneficial to clamping three plastic barrels 3 simultaneously by the first clamping block 5 and the third clamping block 7. Thus, six plastic barrels 3 can be clamped by the first clamping block 5, the second clamping block 6 and the third clamping block 7.
[0043] Refer to Figure 3 Two sets of clamping assemblies are provided, and the two sets of clamping assemblies are arranged in the height direction of the guardrail 13. Thus, six plastic barrels 3 can be clamped and fixed simultaneously by the clamping assemblies. By means of the two sets of clamping assemblies, multiple (twelve) plastic barrels 3 can be clamped and fixed simultaneously.
[0044] Refer to Figure 5 Or Figure 6 On the second clamping block 6, a driving rack 8 is further provided. The driving rack 8 is distributed in the width direction of the first clamping block 5. At the end of the driving rack 8 close to the second clamping block 6, one end of the driving rack 8 is close to the third clamping block 7. On the third clamping block 7, an auxiliary driving rack 9 is provided. The auxiliary driving rack 9 is also distributed in the width direction of the first clamping block 5. At the end of the auxiliary driving rack 9 close to the third rack, the tooth ends of the auxiliary driving gear 10 and the driving gear 10 face each other. A gear 10 is rotatably arranged on the first clamping block 5. The gear 10 is located between the driving rack 8 and the auxiliary driving rack 9, and the gear 10 meshes with the driving rack 8 and the auxiliary driving rack 9. Thus, by driving the second clamping block 6 to move in the width direction of the bottom plate 11 to make the second clamping block 6 close to the first clamping block 5, at the same time, the driving rack 8 is driven to move, the gear 10 can be driven to rotate, the gear 10 drives the auxiliary driving rack 9 to move, and thus the third clamping block 7 is driven to move in the width direction of the bottom plate 11 to make the third clamping block 7 close to the first clamping block 5, so that six plastic barrels 3 can be clamped simultaneously only by driving the second clamping block 6 to move.
[0045] Refer to Figure 5 Or Figure 6, There are two driving racks 8, and the two driving racks 8 are respectively located at both ends of the second clamping block 6. There are two auxiliary driving racks 9 corresponding to the number of the driving racks 8. The two auxiliary driving racks 9 are respectively arranged at both ends of the third clamping block 7, and the tooth ends of the two auxiliary driving racks 9 are correspondingly directed towards the tooth ends of the two driving racks 8. There are also two corresponding gears 10. The two gears 10 are respectively located at the first sliding part 51 and the second sliding part 53 of the first clamping block 5. The two gears 10 are correspondingly meshed with the two driving racks 8, and the two gears 10 are also correspondingly meshed with the two auxiliary driving racks 9, which is beneficial to making the clamping process more stable.
[0046] Refer to Figure 4 or Figure 6 , when both the second clamping block 6 and the third clamping block 7 move in the direction close to the first clamping block 5, the total width between the first clamping block 5, the second clamping block 6 and the third clamping block 7 is the same as the short side of the guardrail 13 close to the bottom plate 11. By clamping the plastic barrel 3 and extending it into the cross seat 4, the driving switch door 2 is driven to rotate along the hinge axis, so that the first clamping block 5, the second clamping block 6 and the third clamping block 7 keep clamping the plastic barrel 3.
[0047] The implementation principle of this application is as follows: By placing the plastic barrel 3 between the first clamping block 5, the second clamping block 6 and the third clamping block 7, the plastic barrel 3 is located between the first clamping groove 521 and the second clamping groove 61, or between the first clamping groove 521 and the third clamping groove 71. By driving the second clamping block 6 to move along the width direction of the bottom plate 11, the second clamping block 6 drives the driving rack 8 to move, so that the driving rack 8 drives the gear 10 to rotate, and the gear 10 drives the auxiliary driving rack 9 to move, thereby clamping the plastic barrel 3. At the same time, it extends into the guardrail 13. By driving the driving switch door 2 to rotate along the hinge axis, transportation can be carried out, thereby preventing the plastic barrel 3 from colliding or being squeezed during transportation and preventing deformation.
[0048] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.
Claims
1. A plastic barrel transporter, comprising a transport base (1), characterized in that: The transport base (1) is provided with a clamping assembly, the clamping assembly comprising a first clamping block (5) slidably arranged on the transport base (1), a second clamping block (6) and a third clamping block (7) slidably arranged on the first clamping block (5), the first clamping block (5) comprising a first sliding portion (51), a clamping portion (52) and a second sliding portion (53) arranged in sequence from one end to the other end, the first sliding portion (51) and the second sliding portion (53) both slidably cooperate with the transport base (1); The clamping portion (52) of the first clamping block (5) is provided with a first clamping groove (521), and the plurality of first clamping grooves (521) are evenly divided into two groups. The two groups of the first clamping grooves (521) are respectively oriented toward the second clamping block (6) and the third clamping block (7). The second clamping block (6) is provided with a second clamping groove (61) on one side close to the first clamping block (5). The number of the second clamping grooves (61) is consistent with the number of the first clamping grooves (521) in one group. The plurality of the second clamping grooves (61) correspond one-to-one to the plurality of the first clamping grooves (521) in one group. When the plastic barrel (3) is driven to the first clamping grooves (521) and the second clamping grooves When the plastic barrel (3) is between the first clamping groove (521) and the second clamping groove (61), the second clamping block (6) is driven to approach the first clamping block (5), and the second clamping groove (61) and the first clamping groove (521) clamp the plastic barrel (3); a third clamping groove (71) is provided on a side of the third clamping block (7) close to the first clamping block (5), and the third clamping groove (71) is substantially consistent with the second clamping groove (61); when the plastic barrel (3) is driven to between the first clamping groove (521) and the third clamping groove (71), the third clamping block (7) is driven to approach the first clamping block (5), and the third clamping groove (71) and the first clamping groove (521) clamp the plastic barrel (3).
2. The plastic barrel transporter according to claim 1, characterized in that: The clamping components are provided in multiple groups, and the multiple groups of clamping components are arranged at intervals along the height direction of the guardrail (13).
3. The plastic barrel transporter according to claim 1, characterized in that: The second clamping block (6) is also provided with an active rack (8), and the active rack (8) is distributed along the direction in which the second clamping block (6) approaches or moves away from the first clamping block (5). One end of the active rack (8) is close to the third clamping block (7). The third clamping block (7) is provided with an auxiliary rack (9), and the auxiliary rack (9) is parallel to the active rack (8), and the tooth end of the auxiliary rack (9) and the tooth end of the active rack (8) are facing each other. The first clamping block (5) is rotatably provided with a gear (10), and the gear (10) is located between the active rack (8) and the auxiliary rack (9), and the gear (10) is meshed with the active rack (8) and the auxiliary rack (9).
4. The plastic barrel transporter according to claim 3, characterized in that: Two active racks (8) are provided, and the two active racks (8) are respectively located on both sides of the second clamping block (6); two auxiliary racks (9) are provided corresponding to the number of active racks (8), and the two auxiliary racks (9) are respectively provided on both sides of the third clamping block (7); the tooth ends of the two auxiliary racks (9) are correspondingly facing the tooth ends of the two active racks (8); two gears (10) are also provided correspondingly, and the two gears (10) are meshed with the two active racks (8) in a one-to-one manner, and the two gears (10) are also meshed with the two auxiliary racks (9) in a one-to-one manner.
5. The plastic barrel transporter according to claim 4, characterized in that: The transport base (1) comprises a bottom plate (11) arranged in a rectangular shape, a rotating wheel (12) arranged on one side of the bottom plate (11), and a guardrail (13) arranged on the bottom plate (11) away from the rotating wheel (12); a cross seat (4) is arranged on the guardrail (13); the cross seat (4) is parallel to the bottom plate (11); two cross seats (4) form a group; the two cross seats (4) in a group are respectively slidably matched with the first sliding portion (51) and the second sliding portion (53) of the first clamping block (5); a plurality of groups are arranged on the guardrail (13) corresponding to the number of clamping components; the plurality of groups of cross seats (4) are parallel along the height direction of the guardrail (13).
6. The plastic barrel transporter according to claim 5, characterized in that: A plurality of rotating wheels (12) are provided, and the plurality of rotating wheels (12) are equally divided into two groups. The two groups of rotating wheels (12) are respectively provided on two opposite sides of the bottom plate (11), and the rotating wheels (12) in one group are distributed at intervals along one side of the bottom plate (11).
7. The plastic barrel transporter according to claim 6, characterized in that: The rotating wheel (12) comprises a universal wheel.
8. The plastic barrel transporter according to claim 5, characterized in that: The guardrail (13) is perpendicular to the bottom plate (11), and the guardrail (13) is arranged around three sides of the bottom plate (11). A switch door (2) is hinged on the guardrail (13), and the switch door (2) is close to the opening side of the guardrail (13). One side of the switch door (2) is hinged to the guardrail (13) through a hinge axis, and a latch for locking the switch door (2) is arranged on the side of the switch door (2) away from the hinge axis. When the first clamping block (5), the second clamping block (6) and the third clamping block (7) clamp the plastic barrel (3), the switch door (2) is driven to rotate along the hinge axis and the switch door (2) is locked through the latch, so that the first clamping block (5), the second clamping block (6) and the third clamping block (7) can keep clamping the plastic barrel (3).