Conveying device for plastic preparation

Abstract

The utility model relates to the technical field of transmission equipment, and provides a transmission device for plastic preparation, which is characterized in that the middle of a warped plate is rotatably arranged on a central support component, one end of the warped plate is rotatably connected with a rotating shaft for driving a delivery wheel, and the other end of the warped plate is rotatably connected with a limiting sliding shaft; the limiting sliding shaft is sleeved with the driven conveying wheel, the driven conveying wheel and the limiting sliding shaft rotate together, the driving conveying wheel and the driven conveying wheel are connected through a conveying belt, the multi-stage lifting assembly is arranged below the driving conveying wheel, the output end of the multi-stage lifting assembly is fixedly connected with the sliding base, and the driving conveying wheel is rotationally arranged on the sliding base through a rotating shaft. One end of the rotating shaft is connected with the output end of a driving motor fixedly installed on the outer side of the sliding base, arc-shaped sliding grooves are formed in the two sides of the sliding groove base respectively, the two ends of the limiting sliding shaft are arranged in the two arc-shaped sliding grooves in a sliding mode respectively, and the sliding groove base is fixedly connected with the bottom plate through a supporting base. The service life of equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission equipment technical field especially relates to a transmission device for plastic preparation. BACKGROUND

[0002] Plastic is the monomer as raw material, through polyaddition or condensation polymerization and become the high molecular compound, its anti deformation ability is medium, between fibre and rubber, by synthetic resin and filler, plasticizer, stabilizer, lubricant, colorant and additive composition. Most plastics are light in weight, chemically stable, and will not rust; good impact resistance; have good transparency and wear resistance; good insulation, low thermal conductivity; good general formability, coloring property, low processing cost. In the process of producing plastic products, the raw materials of plastic products need to be transported.

[0003] Such as the application number: CN202022043126.0 disclosed a kind of transmission device for plastic preparation, solve the problem of impurity removal in the prior art in conveying process, leading to low work efficiency, the problem of manpower consumption.A kind of transmission device for plastic preparation, including bearing plate, bearing plate is provided with two, and two bearing plates are provided with two roller shafts, the bottom of conveying belt is provided with driving motor, the top of conveying belt is provided with bearing frame, and the bottom of bearing frame is fixedly connected between the top of two sides bearing plate, the bottom of the inner side of bearing frame is fixedly connected with several fixed rods, and the corresponding end of several fixed rods is fixedly connected with first roller, and several first rollers are attached to the surface wall of conveying belt, and the corresponding side between several first rollers has certain spacing, the top of conveying belt is provided with impurity removal mechanism.

[0004] However, the transmission efficiency of the existing transmission device for plastic preparation is low, and the transmission efficiency cannot be increased on the basis of the transmission efficiency, and the transmission weight is limited, so that the overall service life of the device is reduced. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems, the utility model provides a kind of transmission device for plastic preparation to solve this problem.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a kind of transmission device for plastic preparation, including bottom plate, center support component, hinged plate, driving transmission wheel, driven transmission wheel, conveyer belt, multistage lifting assembly, sliding seat, driving motor, limit sliding shaft, sliding slot seat and support seat, the center support component is fixedly installed on bottom plate, hinged plate middle part rotation is arranged on center support component, hinged plate one end is rotatably connected with the pivot of driving transmission wheel, hinged plate other end is rotatably connected with limit sliding shaft, driven transmission wheel is sleeved on limit sliding shaft and is rotatable with limit sliding shaft, driving transmission wheel and driven transmission wheel are connected by conveyer belt, multistage lifting assembly is arranged below driving transmission wheel, the output of multistage lifting assembly is fixedly connected with sliding seat, driving transmission wheel is rotatably arranged on sliding seat by pivot, the one end of the pivot is connected with the output of driving motor fixedly installed on the outside of sliding seat, sliding slot seat is provided with arc sliding slot on both sides, limit sliding shaft both ends are slidably arranged in two groups of arc sliding slots, and sliding slot seat is fixedly connected with bottom plate by support seat.

[0008] Preferably, the sliding seat comprises a fixed seat, a cover plate, a sliding plate, a vertical plate, and a reinforcing plate. The fixed seat is fixedly connected with the output of the multistage lifting assembly. The cover plate is fixedly installed on the upper side of the fixed seat. The sliding plate is slidably arranged between the fixed seat and the cover plate. The sliding plate is fixedly connected with the lower ends of the two groups of vertical plates at both ends. The reinforcing plate is fixedly installed between the two groups of vertical plates. The upper portions of the two groups of vertical plates are connected with the pivot of the driving transmission wheel through a bearing seat. The driving motor is fixedly installed on the outside of the vertical plate.

[0009] Preferably, the multistage lifting assembly comprises a multi-position air cylinder, a cylinder top plate, and a pushing connecting plate. The multi-position air cylinder is fixedly installed on the bottom plate. The output of the bottom plate is fixedly connected with the cylinder top plate. The cylinder top plate is fixedly installed on the lower side of the pushing connecting plate. The pushing connecting plate is fixedly installed on the lower side of the fixed seat.

[0010] Preferably, the hinged plate comprises a rotating connecting part, a first connecting rod part, a second connecting rod part, a rotating clamp jaw, and a limit shaft clamp jaw. The rotating connecting part is rotatably arranged on the center support component. The rotating connecting part is fixedly connected with the first connecting rod part and the second connecting rod part on the left and right sides. The outer end of the first connecting rod part is fixedly connected with one side of the rotating clamp jaw. The other side of the rotating clamp jaw is rotatably connected with the pivot of the driving transmission wheel. The outer end of the second connecting rod part is fixedly connected with one side of the limit shaft clamp jaw. The other side of the limit shaft clamp jaw is rotatably connected with the limit sliding shaft.

[0011] Preferably, the center support component comprises a center support seat and a center shaft. The center support seat is fixedly installed on the bottom plate. The center shaft is fixedly installed on the upper portion of the center support seat. The rotating connecting part is rotatably connected with the center shaft through a bearing.

[0012] Preferably, two groups of limit rings are fixedly installed on both ends of the limit sliding shaft. The two groups of limit rings are arranged on the inner sides of the two groups of arc sliding slots.

[0013] Preferably, further comprising: a material blocking plate, the material blocking plate is provided with two groups, two groups of material blocking plates are respectively arranged on both sides of the conveying belt and are fixedly connected with the warped plate.

[0014] Preferably, further comprising: a tensioning assembly, the tensioning assembly comprises: a hand-tightened long rod screw, a rotating column, a tensioning plate and a limiting rotating plate, the hand-tightened long rod screw is fixedly connected with the upper side of the rotating column through the first connecting rod part or the second connecting rod part, the hand-tightened long rod screw is connected with the first connecting rod part or the second connecting rod part through thread cooperation, the lower part of the rotating column is rotationally arranged in the tensioning plate, the limiting rotating plate is rotationally arranged at the lower part of the tensioning plate, the upper side of the limiting rotating plate is fixedly connected with the lower side of the rotating column, and the diameter of the limiting rotating plate is greater than the diameter of the rotating column.

[0015] The device can make the conveying belt tilt towards any one end through the setting of the warped plate, thereby improving the use range, the precise control ability of the tilt angle is improved through the setting of the multi-stage lifting assembly, the stability of the whole device is improved through the setting of the supporting seat and the central supporting assembly, precise guidance is provided through the setting of the limiting sliding shaft and the sliding groove seat, and the tilt effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the application. The embodiments of the application and its

[0017] Figure 1 is a structural schematic view of the utility model;

[0018] Figure 2 is a front view of the utility model;

[0019] Figure 3 is a side view of the utility model;

[0020] Figure 4 is a top view of the utility model;

[0021] Figure 5 is a structural schematic view of the sliding seat of the utility model;

[0022] Figure 6 is a structural schematic view of the multi-stage lifting assembly of the utility model;

[0023] Figure 7 is a structural schematic view of the warped plate of the utility model;

[0024] Figure 8It is the structural schematic view of the center support assembly of the utility model;

[0025] Figure 9 It is the structural schematic view of the limiting sliding shaft of the utility model;

[0026] Figure 10 It is the structural schematic view of the material baffle of the utility model;

[0027] Figure 11 It is the structural schematic view of the tensioning assembly of the utility model;

[0028] Figure 12 It is the sectional view of the tensioning assembly of the utility model.

[0029] Mark explanation:

[0030] 1, bottom plate;2, center support assembly;3, warped plate;4, driving transmission wheel;5, driven transmission wheel;6, conveying belt;7, multistage lifting assembly;8, sliding seat;9, driving motor;10, limiting sliding shaft;11, sliding groove seat;12, support seat;81, fixed seat;82, cover plate;83, sliding plate;84, vertical plate;85, reinforcing plate;71, multi-position air cylinder;72, air cylinder top plate;73, push connecting plate;31, rotating connecting part;32, first connecting rod part;33, second connecting rod part;34, rotating clamp jaw;35, limiting shaft clamp jaw;21, center support seat;22, center shaft;101, limiting ring;13, material baffle;141, hand screw long rod screw;142, rotating column;143, tensioning plate;144, limiting rotating plate. Specific implementation

[0031] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0032] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0033] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, term " install " " link " " connection " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements. For ordinary skilled in the art, the above-mentioned terms can be understood by the specific meaning in the utility model through specific circumstances.

[0034] Embodiment one, in combination Figures 1-4 It is explained:

[0035] A kind of transmission device for plastic preparation, including bottom plate 1, center support component 2, warped plate 3, driving transmission wheel 4, driven transmission wheel 5, conveying belt 6, multistage lifting assembly 7, sliding seat 8, driving motor 9, limit sliding shaft 10, sliding groove seat 11 and support seat 12, the center support component 2 is fixedly installed on bottom plate 1, warped plate 3 middle part rotationally arranged on center support component 2, warped plate 3 one end is rotatably connected with the pivot of driving transmission wheel 4, warped plate 3 other end is rotatably connected with limit sliding shaft 10, driven transmission wheel 5 is sleeved on limit sliding shaft 10 and is rotatable with limit sliding shaft 10, driving transmission wheel 4 and driven transmission wheel 5 are connected by conveying belt 6, multistage lifting assembly 7 is arranged below driving transmission wheel 4, the output end of multistage lifting assembly 7 is fixedly connected with sliding seat 8, driving transmission wheel 4 is rotatably arranged on sliding seat 8 by pivot, the one end of the pivot is connected with the output end of driving motor 9 fixedly installed on the outer side of sliding seat 8, sliding groove seat 11 both sides are respectively provided with arc-shaped sliding groove, limit sliding shaft 10 both ends are slidably arranged in two groups of arc-shaped sliding grooves, and sliding groove seat 11 is fixedly connected with bottom plate 1 by support seat 12.

[0036] By setting warped plate 3, conveying belt 6 can be inclined towards conveying direction under the action of multistage lifting assembly 7, to improve conveying efficiency, and the inclined conveying belt 6 can carry more weight of plastic products, to improve the service life of the equipment, the setting of warped plate 3 can make the conveying belt 6 inclined towards either end, to improve the application range, the setting of multistage lifting assembly 7 improves the precision control ability of inclination angle, the setting of support seat 12 and center support component 2 improves the stability of the whole equipment, and the setting of limit sliding shaft 10 and sliding groove seat 11 provides accurate guidance, to ensure the inclination effect.

[0037] Embodiment two, in combination Figure 5 It is explained:

[0038] The slide block 8 includes: a fixed base 81, a cover plate 82, a slide plate 83, a vertical plate 84, and a reinforcing plate 85. The fixed base 81 is fixedly connected to the output end of the multi-stage lifting assembly 7. The cover plate 82 is fixedly installed on the upper side of the fixed base 81. The slide plate 83 is slidably disposed between the fixed base 81 and the cover plate 82. Both ends of the slide plate 83 are fixedly connected to the lower ends of the two sets of vertical plates 84, respectively. The reinforcing plate 85 is fixedly installed between the two sets of vertical plates 84. The upper parts of the two sets of vertical plates 84 are connected to the shaft of the drive transmission wheel 4 through a bearing seat. The drive motor 9 is fixedly installed on the outside of the vertical plate 84.

[0039] When in use, when the fixed seat 81 moves upward, the slide plate 83 will slide between the fixed seat 81 and the cover plate 82, thereby driving the drive transmission wheel 4 to rotate around the center of the rocker 3. The upright plate 84 is used to connect with the drive transmission wheel 4 and the rotating shaft, and the reinforcing plate 85 is used to ensure the connection strength between the two sets of upright plates 84.

[0040] Example 3, based on Example 2, combined with Figure 6 Explanation:

[0041] The multi-stage lifting assembly 7 includes: a multi-position cylinder 71, a cylinder top plate 72, and a push connecting plate 73. The multi-position cylinder 71 is fixedly installed on the base plate 1. The output end of the base plate 1 is fixedly connected to the cylinder top plate 72. The cylinder top plate 72 is fixedly installed on the lower side of the push connecting plate 73. The push connecting plate 73 is fixedly installed on the lower side of the fixed seat 81.

[0042] With this configuration, the stroke of the multi-position cylinder 71 is 300mm, 400mm, and 500mm. When the multi-position cylinder 71 is in the "300mm" position, the rocker plate 3 tilts towards the drive transmission wheel 4; when the multi-position cylinder 71 is in the "400mm" position, the rocker plate 3 remains horizontal; and when the multi-position cylinder 71 is in the "500mm" position, the rocker plate 3 tilts towards the driven transmission wheel 5. Different tilting directions can adapt to different transport directions.

[0043] Example 4, based on Example 3, combined with Figure 7 Explanation:

[0044] The rocker arm 3 includes: a rotating connecting part 31, a first connecting rod part 32, a second connecting rod part 33, a rotating gripper 34, and a limiting shaft gripper 35.

[0045] The rotating connecting part 31 is rotatably arranged on the center support assembly 2, and the rotating connecting part 31 is fixedly connected with the first connecting rod part 32 and the second connecting rod part 33 on the left and right sides through welding, the outer end of the first connecting rod part 32 is fixedly connected with one side of the rotating clamp jaw 34 through welding, the other side of the rotating clamp jaw 34 is rotatably connected with the rotating shaft of the driving transmission wheel 4, and the outer end of the second connecting rod part 33 is fixedly connected with one side of the limiting shaft clamp jaw 35 through welding, and the other side of the limiting shaft clamp jaw 35 is rotatably connected with the limiting sliding shaft 10.

[0046] In use, the rotating connecting part 31 can drive the rotating clamp jaw 34 and the limiting shaft clamp jaw 35 to rotate through the first connecting rod part 32 and the second connecting rod part 33.

[0047] In the fourth embodiment, the fifth embodiment is combined with Figure 8 for description:

[0048] The center support assembly 2 comprises a center support seat 21 and a center shaft 22, the center support seat 21 is fixedly installed on the bottom plate 1, the center shaft 22 is fixedly installed on the upper part of the center support seat 21, and the rotating connecting part 31 is rotatably connected with the center shaft 22 through a bearing.

[0049] In this way, the flap 3 can rotate around the axis of the center shaft 22, and the center support seat 21 improves the structural stability.

[0050] In the fifth embodiment, the sixth embodiment is combined with Figure 9 for description:

[0051] The limiting sliding shaft 10 is fixedly installed with two groups of limiting rings 101 at both ends, and the two groups of limiting rings 101 are arranged on the inner sides of the two groups of arc-shaped sliding grooves. By arranging the two groups of limiting rings 101, the limiting sliding shaft 10 can be prevented from being pulled out of the sliding groove seat 11.

[0052] In the sixth embodiment, the seventh embodiment is combined with Figure 10 for description:

[0053] Further comprising: a material blocking plate 13, the material blocking plate 13 is provided with two groups, and the two groups of material blocking plates 13 are arranged on the two sides of the conveying belt 6 and are fixedly connected with the flap 3. In this way, by arranging the material blocking plate 13, the material can be prevented from sliding out of the conveying belt.

[0054] In the seventh embodiment, the eighth embodiment is combined with Figure 11 and Figure 12 for description:

[0055] Further comprise: the tensioning assembly, the tensioning assembly includes: the hand screw long rod 141, the rotating column 142, the tensioning plate 143 and the limit rotating plate 144, the hand screw long rod 141 is fixedly connected with the rotating column 142 upper side through the first connecting rod part 32 or the second connecting rod part 33, the hand screw long rod 141 is connected with the first connecting rod part 32 or the second connecting rod part 33 by screw thread cooperation, the rotating column 142 lower part rotationally arranged in the tensioning plate 143, the limit rotating plate 144 rotationally arranged in the tensioning plate 143 lower part, the limit rotating plate 144 upper side is fixedly connected with the rotating column 142 lower side, and the limit rotating plate 144 diameter is greater than the rotating column 142 diameter.

[0056] Thus, the tensioning assembly is used to adjust the tension of the conveying belt 6, and the hand screw long rod 141 can be rotated to adjust the extension distance of the tensioning plate 143, so that the conveying belt is straightened.

[0057] The working principle of the utility model is: when the device is used, the multi-stage lifting assembly 7 is started to drive the sliding seat 8 to move upwards or downwards, so as to drive the driving conveying wheel 4 to move upwards or downwards, so that the conveying belt 6 is maintained in an inclined state through the rocker plate 3, the driven conveying wheel 5 moves in the sliding groove seat 11 through the limiting sliding shaft 10, so as to cooperate with the inclination of the rocker plate 3, the inclined conveying belt can make the plastic products have a certain gravitational potential, so as to improve the conveying efficiency, and the inclined conveying belt can also reduce the bearing capacity of the conveying belt, prolonging the service life of the conveying belt.

[0058] For those skilled in the art, the utility model is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the claims involved.

[0059] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any slight modification, equivalent replacement and improvement according to the technical essence of the utility model on the above embodiments should be included in the protection scope of the technical scheme of the utility model.

Claims

1. A conveying device for plastic preparation, characterized in that, include: The system comprises a base plate (1), a central support assembly (2), a rocker (3), a drive transmission wheel (4), a driven transmission wheel (5), a conveyor belt (6), a multi-stage lifting assembly (7), a slide block (8), a drive motor (9), a limiting sliding shaft (10), a slide block seat (11), and a support seat (12). The central support assembly (2) is fixedly mounted on the base plate (1). The rocker (3) is rotatably mounted on the central support assembly (2) at its center. One end of the rocker (3) is rotatably connected to the shaft of the drive transmission wheel (4), and the other end of the rocker (3) is rotatably connected to the limiting sliding shaft (10). The driven transmission wheel (5) is fitted onto the limiting sliding shaft (10) and is connected to the limiting sliding shaft. The drive shaft (10) rotates together, the drive transmission wheel (4) and the driven transmission wheel (5) are connected by the conveyor belt (6), the multi-stage lifting assembly (7) is set below the drive transmission wheel (4), the output end of the multi-stage lifting assembly (7) is fixedly connected to the slide (8), the drive transmission wheel (4) is rotatably set on the slide (8) by the rotating shaft, one end of the rotating shaft is connected to the output end of the drive motor (9) fixedly installed on the outside of the slide (8), the slide seat (11) is provided with arc-shaped slide grooves on both sides, the two ends of the limiting sliding shaft (10) are slidably set in the two sets of arc-shaped slide grooves, and the slide seat (11) is fixedly connected to the base plate (1) by the support seat (12).

2. The conveying device for plastic preparation according to claim 1, characterized in that, The slide (8) includes: a fixed seat (81), a cover plate (82), a slide plate (83), a vertical plate (84), and a reinforcing plate (85). The fixed seat (81) is fixedly connected to the output end of the multi-stage lifting assembly (7). The cover plate (82) is fixedly installed on the upper side of the fixed seat (81). The slide plate (83) is slidably disposed between the fixed seat (81) and the cover plate (82). The two ends of the slide plate (83) are fixedly connected to the lower ends of the two sets of vertical plates (84) respectively. The reinforcing plate (85) is fixedly installed between the two sets of vertical plates (84). The upper parts of the two sets of vertical plates (84) are connected to the shaft of the drive transmission wheel (4) through a bearing seat. The drive motor (9) is fixedly installed on the outside of the vertical plate (84).

3. The conveying device for plastic preparation according to claim 1, characterized in that, The multi-stage lifting assembly (7) includes: a multi-position cylinder (71), a cylinder top plate (72), and a push connecting plate (73). The multi-position cylinder (71) is fixedly installed on the base plate (1). The output end of the base plate (1) is fixedly connected to the cylinder top plate (72). The cylinder top plate (72) is fixedly installed on the lower side of the push connecting plate (73). The push connecting plate (73) is fixedly installed on the lower side of the fixed seat (81).

4. The conveying device for plastic preparation according to claim 1, characterized in that, The rocker (3) includes: a rotating connecting part (31), a first connecting rod part (32), a second connecting rod part (33), a rotating gripper (34), and a limiting shaft gripper (35). The rotating connecting part (31) is rotatably mounted on the central support assembly (2). The left and right sides of the rotating connecting part (31) are fixedly connected to the first connecting rod part (32) and the second connecting rod part (33) respectively. The outer end of the first connecting rod part (32) is fixedly connected to one side of the rotating gripper (34), and the other side of the rotating gripper (34) is rotatably connected to the shaft of the drive transmission wheel (4). The outer end of the second connecting rod part (33) is fixedly connected to one side of the limiting shaft gripper (35), and the other side of the limiting shaft gripper (35) is rotatably connected to the limiting sliding shaft (10).

5. The conveying device for plastic preparation according to claim 4, characterized in that, The central support assembly (2) includes a central support base (21) and a central shaft (22). The central support base (21) is fixedly installed on the base plate (1), and the central shaft (22) is fixedly installed on the upper part of the central support base (21). The rotating connection part (31) is rotatably connected to the central shaft (22) through a bearing.

6. The conveying device for plastic preparation according to claim 1, characterized in that, Two sets of limiting rings (101) are fixedly installed at both ends of the limiting sliding shaft (10), and the two sets of limiting rings (101) are respectively set inside the two sets of arc-shaped sliding grooves.

7. The conveying device for plastic preparation according to claim 1, characterized in that, Also includes: The baffle (13) is provided in two sets. The two sets of baffles (13) are respectively set on both sides of the conveyor belt (6) and fixedly connected to the rocker plate (3).

8. A conveying device for plastic preparation according to claim 4, characterized in that, Also includes: The tensioning assembly includes: a hand-tightened long rod screw (141), a rotating column (142), a tensioning plate (143), and a limiting rotating plate (144). The hand-tightened long rod screw (141) passes through the first connecting rod (32) or the second connecting rod (33) and is fixedly connected to the upper side of the rotating column (142). The hand-tightened long rod screw (141) is connected to the first connecting rod (32) or the second connecting rod (33) by threaded engagement. The lower part of the rotating column (142) is rotatably disposed inside the tensioning plate (143). The limiting rotating plate (144) is rotatably disposed below the tensioning plate (143). The upper side of the limiting rotating plate (144) is fixedly connected to the lower side of the rotating column (142). The diameter of the limiting rotating plate (144) is larger than the diameter of the rotating column (142).

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