Automatic feeding and discharging equipment for deep groove ball retainer

Abstract

The utility model discloses automatic feeding and discharging equipment for a deep groove ball retainer. The automatic feeding and discharging equipment comprises a feeding and discharging module, an action execution module and a stock bin management module. The feeding and discharging module comprises a feeding assembly and a material taking assembly, the feeding assembly and the material taking assembly are installed on the rotating platform, the feeding assembly is used for placing a circular ring in a stamping work area, and the material taking assembly is responsible for removing stamped workpieces from the work area. The action execution module is used for driving the rotating platform to rotate so that the feeding assembly and the taking assembly can complete feeding and taking actions correspondingly, and the whole feeding and discharging module can be driven to the position above the stock bin management module. According to the automatic feeding and discharging equipment for the deep groove ball retainers, automation of the feeding process of the circular rings and the discharging process of the deep groove ball retainers is achieved, and the production efficiency is remarkably improved. Compared with manual operation, feeding and taking actions can be completed more quickly and more accurately, the production cycle and the waiting time are shortened, the opportunity that workers directly participate in the production link is reduced, and therefore the probability of industrial accidents is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of workpiece processing feeding and discharging equipment, and particularly relates to a deep-groove ball retainer automatic feeding and discharging equipment. BACKGROUND

[0002] As a core component of precision mechanical parts, the deep-groove ball retainer has extremely high requirements for process precision and production efficiency in the manufacturing process. However, in the current production process, the feeding of the circular ring and the discharging of the deep-groove ball retainer, two key links, still rely on manual operation, which undoubtedly becomes a bottleneck restricting the improvement of production efficiency. The tediousness and repeatability of manual operation not only lead to slow rhythm, which is difficult to meet the demand of modern industry for efficient and continuous production, but also increase the uncertainty and error in the production process. At the same time, since the workers need to do repetitive physical labor for a long time, fatigue is extremely easy to occur, which not only affects the physical and mental health of the workers, but also greatly increases the probability of work accidents. Therefore, the prior art needs to be further improved and improved. CONTENT OF THE UTILITY MODEL

[0003] The utility model provides a deep-groove ball retainer automatic feeding and discharging equipment to solve the problem that the feeding of the circular ring and the discharging of the deep-groove ball retainer, two key links, rely on manual operation, limit the improvement of production efficiency, and are difficult to meet the demand of modern industry for efficient and continuous production.

[0004] To achieve the above purpose, the utility model provides the following technical scheme:

[0005] A deep-groove ball retainer automatic feeding and discharging equipment, comprising a feeding and discharging module, an action execution module and a stock bin management module;

[0006] The feeding and discharging module comprises a feeding assembly and a material taking assembly, both of which are installed on a rotating platform, the feeding assembly is used for placing the circular ring in the stamping working area, and the material taking assembly is responsible for removing the completed workpiece from the working area;

[0007] The action execution module is used for driving the rotating platform to rotate to make the feeding assembly and the material taking assembly complete the feeding and taking actions respectively, and can drive the whole feeding and discharging module to come to the upper side of the stock bin management module;

[0008] The stock bin management module comprises a feeding mechanism and a material storage mechanism, the action execution module drives the feeding and discharging module to come to the upper side of the stock bin management system and drives the rotating platform to rotate to make the feeding assembly and the material taking assembly correspond to the upper side of the feeding mechanism and the material storage mechanism and descend to realize the taking of the circular ring and the storage of the finished product.

[0009] By adopting the automatic feeding and discharging equipment for deep groove ball retainer of the application, the automation of the feeding of the circular ring and the discharging process of the deep groove ball retainer is realized, and the production efficiency is significantly improved. Compared with manual operation, the automatic equipment can complete the feeding and discharging actions more quickly and accurately, reduces the production cycle and waiting time, reduces the opportunity of manual direct participation in the production link, and thus reduces the probability of work accidents.

[0010] In the preferred implementation, the feeding assembly / taking-out assembly includes a magnetic claw rod and an electromagnet arranged on the magnetic claw rod. The on-off state of the electromagnet is controlled to adsorb or release the metal circular ring and the finished product workpiece.

[0011] The electromagnet realizes the adsorption or release of the metal circular ring and the finished product workpiece by controlling the on-off state thereof. When the electromagnet is powered on, a magnetic field is generated to attract the metal circular ring or the finished product workpiece. When the electromagnet is powered off, the magnetic field disappears, and the metal circular ring or the finished product workpiece is released. The adsorption and release speed of the electromagnet is very fast, and can be completed almost instantaneously, thereby improving the feeding and discharging speed. This helps to shorten the production cycle and improve the production efficiency.

[0012] In the preferred implementation, the rotating platform includes a rotating shaft arranged at the center of the claw rotating disc, and the action execution module includes a cantilever beam. One end of the cantilever beam is provided with a driven pulley fixed shaft, the driven pulley fixed shaft is provided with a driven belt pulley, the other end is provided with a driving pulley fixed shaft, the driving pulley fixed shaft is provided with a driving belt pulley, the driving pulley fixed shaft is connected with the first motor, the driving belt pulley and the driven belt pulley are connected through a synchronous belt, and the rotating shaft is connected with the driven pulley fixed shaft.

[0013] In the preferred implementation, the cantilever beam is installed on the rotating disc, and the rotating disc is connected with the second motor. The action of the second motor can drive the cantilever beam to rotate the feeding and discharging module as a whole.

[0014] In the preferred implementation, the lower side of the rotating disc is provided with a lifting cylinder. The action of the lifting cylinder can make the rotating disc rise and fall, realize the taking-out of the circular ring and the storage of the finished product.

[0015] In the preferred implementation, the feeding mechanism and the storage mechanism include a plurality of limiting rods, which are surrounded to form a ring-shaped limiting unit. A lifting disc is arranged at the center of the limiting unit. The lifting disc is raised to push the stacked circular rings upward for taking-out. The lifting disc is lowered to gradually accumulate the finished products to the bottom.

[0016] In the preferred implementation, a hopper rotating disc is further included. The hopper rotating disc is arranged on the hopper rack. A plurality of limiting units are arranged around the center of the rotating disc on the hopper rotating disc. The hopper rotating disc is provided with a plurality of avoidance openings matched with the lifting disc in shape and located at the centers of the plurality of limiting units. The lifting disc can be lowered below the hopper rotating disc to make the limiting units at different positions come to the upper side of the lifting disc.

[0017] The hopper carousel can carry multiple sets of limiting material units, and each set of limiting material units stores a stack of annular rings or finished products. Through the rotation of the hopper carousel, limiting material units at different positions can be continuously sent to the upper side of the lifting hopper, thereby realizing continuous operation, avoiding waiting time, and improving production efficiency. The lifting hopper can be lowered below the hopper carousel and quickly switched to different limiting material units through the avoidance opening on the hopper carousel. This design makes the material taking and storing process faster and reduces production interruptions caused by changing stations.

[0018] In a preferred implementation, a support plate is provided on the upper side of the hopper rack, the support plate is provided with a material taking opening and a material storing opening, and a partition is provided circumferentially around the material taking opening. The partition separates the top annular ring from the lower annular ring to prevent over-take of material.

[0019] In a preferred implementation, the partition includes a check plate that can move radially. The check plate has a first position and a second position. When in the first position, the annular structure formed by the circumferentially arranged check plate has a diameter greater than the outer diameter of the annular ring, allowing the top annular ring to pass through the check plate to its upper side. When in the second position, the annular structure formed by the circumferentially arranged check plate has a diameter smaller than the outer diameter of the annular ring, allowing the top annular ring to be between the top annular ring and the lower annular ring to achieve separation.

[0020] In a preferred implementation, the end of the check plate is in the shape of a right triangle with the hypotenuse facing downward. The check plate is mounted on a support block. When the top annular ring is lifted, it abuts the hypotenuse, causing the check plate to move away from the center. A spring is provided in the support block to reset the check plate.

[0021] The check plate ensures accurate grabbing of the annular ring and prevents over-take of material. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their descriptions serve to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0023] Figure 1 A schematic three-dimensional structure diagram of one illustrative embodiment of the automatic feeding and unloading equipment for deep groove ball retainer is shown;

[0024] Figure 2 A schematic three-dimensional structure diagram of one illustrative embodiment of the feeding assembly and material taking assembly of the present application is shown;

[0025] Figure 3 A schematic three-dimensional structure diagram of one illustrative embodiment of the feeding mechanism and material storing mechanism of the present application is shown;

[0026] Figure 4 An enlarged structural schematic view of one illustrative embodiment of the support plate material taking port of the present application is shown in the figure;

[0027] Figure 5 An internal structural schematic view of one illustrative embodiment of the check plate of the present application is shown in the figure;

[0028] Label explanation:

[0029] 10, feeding assembly; 11, material taking assembly; 12, material claw turntable; 100, magnetic claw rod; 101, electromagnet; 20, cantilever beam; 21, driven pulley; 22, driving pulley; 23, synchronous belt; 24, first motor; 25, rotating disc; 26, second motor; 27, lifting cylinder; 30, limiting rod; 31, material bin turntable; 310, avoiding opening; 32, lifting material disc; 40, support plate; 400, material taking port; 401, material storing port; 50, material bin rack; 60, support block; 61, check plate. DETAILED DESCRIPTION

[0030] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present application. Therefore, the drawings and the description are considered to be essentially exemplary rather than limiting.

[0031] In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium.

[0032] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation.But note direct connection then explain the connection two main bodies between not pass through excessive structure construction connection relation, only through the connecting structure is connected to form a whole.For the ordinary skill of the art, the above terms can be understood according to the specific circumstances the specific meaning of the utility model.

[0033] In the utility model, the description such as "first", "second" is only used for the purpose of description, and can not be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features.Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0034] The utility model will be described below in conjunction with the drawings.

[0035] The specific scheme adopted is:

[0036] As shown in Figures 1-5 The utility model provides a kind of deep groove ball cage automatic feeding and discharging equipment, including feeding and discharging module, action execution module and bunker management module;

[0037] Feeding and discharging module includes feeding assembly 10 and material taking assembly 11, both are installed in rotating platform, feeding assembly 10 is used to place annular in stamping work area, material taking assembly 11 is responsible for removing workpiece from work area after stamping;

[0038] Action execution module is used to drive rotating platform rotation to make feeding assembly 10 and material taking assembly 11 complete feeding and material taking action respectively, and can drive entire feeding and discharging module to come to the upper side of bunker management module;

[0039] Bunker management module includes feeding mechanism and storage mechanism, action execution module drives feeding and discharging module to come to the upper side of bunker management system and drives rotating platform rotation to make feeding assembly 10 and material taking assembly 11 correspond to the upper side of feeding mechanism and storage mechanism and descend to realize annular material taking and finished product storage.

[0040] The feeding assembly 10 and the taking assembly 11 of the feeding and taking module are respectively located at different positions of the rotating platform. When the action execution module is started, the rotating platform is driven to rotate to make the taking assembly 11 above the stamping working area, the taking assembly 11 takes down the holder with a processed ring, the rotating platform is driven to rotate to make the feeding assembly 10 above the stamping working area, and then the ring is released, thereby completing the feeding action. The above feeding, stamping processing and taking actions constitute a complete work cycle. Through continuous driving of the action execution module and continuous rotation of the rotating platform, the feeding and taking module can efficiently and continuously work between the feeding mechanism, the stamping working area and the storage mechanism. The automation of the feeding of the ring and the taking of the deep groove ball holder is realized, and the production efficiency is significantly improved. Compared with manual operation, the automatic equipment can more quickly and accurately complete the feeding and taking actions, and the production cycle and waiting time are reduced. The automatic equipment reduces the opportunity of manual direct participation in the production link, thereby reducing the probability of work accidents.

[0041] Referring to Figure 1 and Figure 2 , the feeding assembly 10 / taking assembly 11 includes a magnetic claw rod 100 and an electromagnet 101 arranged on the magnetic claw rod 100. The on-off state of the electromagnet 101 is controlled to adsorb or release the metal ring and the finished product workpiece.

[0042] The electromagnet 101 realizes adsorption or release of the metal ring and the finished product workpiece by controlling the on-off state thereof. When the electromagnet 101 is powered on, a magnetic field is generated to attract the metal ring or the finished product workpiece. When the electromagnet 101 is powered off, the magnetic field disappears, and the metal ring or the finished product workpiece is released. By changing the position of the electromagnet 101 on the magnetic claw rod 100, the position of the adsorption point can be adjusted to adapt to metal rings and finished product workpieces of different sizes. This enables the feeding / taking assembly 11 to process products of multiple specifications, improving the versatility and flexibility of the equipment.

[0043] The on-off state of the electromagnet 101 can be realized by simple electrical control without complex mechanical adjustment. This makes the operation more convenient and facilitates integration with an automatic control system to realize remote control and automatic operation. The adsorption and release speed of the electromagnet 101 is very fast and can be completed almost instantaneously, thereby improving the feeding and taking speed. This helps to shorten the production cycle and improve the production efficiency.

[0044] Referring to Figure 1 and Figure 2, the rotating platform comprises a rotating shaft provided at the center of the material claw turntable 12, and the action execution module comprises a cantilever beam 20, one end of the cantilever beam 20 is provided with a driven wheel fixing shaft, the driven wheel fixing shaft is provided with a driven belt pulley 21, the other end is provided with a driving wheel fixing shaft, the driving wheel fixing shaft is provided with a driving belt pulley 22, the driving wheel fixing shaft is connected with a first motor 24, the driving belt pulley 22 and the driven belt pulley 21 are connected through a synchronous belt 23, and the rotating shaft is connected with the driven wheel fixing shaft.

[0045] When the first motor 24 is started, the driving belt pulley 22 rotates, and the power is transmitted to the driven belt pulley 21 through the synchronous belt 23. When the driven belt pulley 21 rotates, the driven wheel fixing shaft and the rotating shaft connected therewith rotate. When the rotating shaft rotates, the material claw turntable 12 and the feeding assembly 10 and the material taking assembly 11 installed thereon rotate together, so that the feeding and material taking actions are realized. It is necessary to accurately control the angle of the rotating platform, so that the material taking assembly 11 and the feeding assembly 10 can accurately reach the specified positions respectively. The high-precision positioning capability of the servo motor makes it very suitable for this application scenario. By sending accurate pulse signals to the servo motor, it can be controlled to rotate to the specified angle, so as to realize the accurate positioning of the material taking assembly 11 and the feeding assembly 10.

[0046] Referring to Figure 1 and Figure 2 , the cantilever beam 20 is installed on the rotating disc 25, the rotating disc 25 is connected with a second motor 26, and the second motor 26 can drive the cantilever beam 20 to rotate as a whole. The rotating disc 25 and the second motor 26 are the existing hollow rotating platform structure. Through the rotating movement of the rotating disc 25, the cantilever beam 20 and the feeding and discharging module thereon rotate as a whole, so that the material transfer between different stations is realized.

[0047] Further, the lower side of the rotating disc 25 is provided with a lifting cylinder 27, the lifting cylinder 27 can drive the rotating disc 25 and the cantilever beam 20 thereon to rise and fall, so as to realize the material taking of the ring and the storage of the finished product.

[0048] Referring to Figure 1 and Figure 3 , the feeding mechanism and the storage mechanism comprise a plurality of limiting rods 30, the plurality of limiting rods 30 are enclosed to form a ring-shaped limiting unit, a lifting tray 32 is arranged at the center of the limiting unit, the lifting tray 32 is lifted to push the stacked rings upward to facilitate material taking, and the lifting tray 32 is lowered to gradually accumulate the finished products to the bottom.

[0049] The feeding stage: the lifting tray 32 is lifted to push the rings in the limiting unit upward to the material taking position. At this time, the material taking assembly 11 (such as a magnetic claw) can grab the ring for subsequent processing.

[0050] Material taking and processing: the material taking assembly 11 takes the ring and moves to the processing area for processing. After processing, the finished product is sent back to the storage mechanism.

[0051] Finished product accumulation: the lifting tray 32 is lowered to accumulate the finished product at the bottom. At the same time, the hopper carousel 31 rotates to bring the next material limiting unit to be processed to the upper side of the lifting tray 32.

[0052] Hopper carousel 31 rotation: when the material limiting unit is empty or full of finished product after completing the loading or storage operation on the lifting tray 32, the hopper carousel 31 starts to rotate. The hopper carousel 31 is provided with a plurality of avoidance openings 310, which are matched with the lifting tray 32 in shape, to ensure that the lifting tray 32 can smoothly descend below the carousel.

[0053] Next material limiting unit in place: the rotation of the hopper carousel 31 brings the next material limiting unit to be taken or stored to the upper side of the lifting tray 32. In this way, the system can continue the next loading operation.

[0054] Cyclic repetition: the above process is repeated to realize automatic loading, processing and finished product accumulation of the metal ring.

[0055] Referring to Figure 3 and Figure 4 , a support plate 40 is provided on the upper side of the hopper frame 50, which is provided with a material taking opening 400 and a material storage opening 401. A partition is provided on the circumference of the material taking opening 400 to separate the top ring from the lower ring to avoid overloading. The end of the check plate 61 is in the shape of a right triangle, with the inclined surface facing downward. When the top ring is lifted, it can smoothly abut against the inclined surface and push the check plate 61 to move radially.

[0056] The check plate 61 is provided with a first position and a second position. In the first position, the annular structure formed by the circumferentially arranged check plate 61 has a diameter greater than the outer diameter of the ring, allowing the top ring to pass and come to its upper side. In the second position, the diameter of the annular structure is smaller than the outer diameter of the ring, so that the check plate 61 can be tightly clamped between the top ring and the lower ring, achieving effective separation.

[0057] Specifically, referring to Figure 5 , the check plate 61 is moved on the support block 60, which is provided with a spring (not shown in the figure). When the top ring is lifted, it will abut against the inclined surface of the check plate 61, causing the check plate 61 to move away from the center. At this time, the spring is compressed, providing power for the reset of the check plate 61.

[0058] When the top ring passes through the check plate 61, or the material taking assembly 11 completes the material taking and leaves the material taking port 400, the spring force makes the check plate 61 reset to the initial position. The check plate 61 is clamped between the top ring and the lower ring by the inclined end, forming an effective separation, and preparing for the next material taking operation.

[0059] The above process is repeated to realize the separation of the ring and the material taking. During the whole process, the check plate 61 plays a crucial role, ensuring accurate grabbing of the ring and avoiding the occurrence of multiple taking. Further improve the automation level and production efficiency of the whole system.

[0060] The parts not described in the utility model can be realized by using or referring to the existing technology.

[0061] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any skilled person in the art can easily think of various changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A deep groove ball retainer automatic feeding and discharging equipment, characterized in that, The application relates to a feeding and discharging device for a punching machine. The feeding and discharging module comprises a feeding assembly and a discharging assembly, both of which are installed on a rotating platform, the feeding assembly is used for placing a ring in a punching working area, and the discharging assembly is responsible for removing a workpiece from the working area after punching; The action execution module is used for driving the rotating platform to rotate so that the feeding assembly and the discharging assembly respectively complete feeding and discharging actions, and can drive the whole feeding and discharging module to be above the stock bin management module; The stock bin management module comprises a feeding mechanism and a storage mechanism, the action execution module drives the feeding and discharging module to be above the stock bin management system, and drives the rotating platform to rotate so that the feeding assembly and the discharging assembly are above the upper sides of the feeding mechanism and the storage mechanism and are lowered to realize ring taking and finished product storage.

2. The deep groove ball retainer automatic feeding and discharging equipment according to claim 1, characterized in that, The feeding assembly / discharging assembly comprises a magnetic claw rod and an electromagnet arranged on the magnetic claw rod, the on-off state of the electromagnet is controlled to adsorb or release the metal ring and the finished product workpiece.

3. The deep groove ball retainer automatic feeding and discharging equipment according to claim 1, characterized in that, The rotating platform comprises a rotating shaft arranged at the center of a claw rotating disc, the action execution module comprises a cantilever beam, one end of the cantilever beam is provided with a driven wheel fixing shaft, the driven wheel fixing shaft is provided with a driven belt pulley, the other end of the cantilever beam is provided with a driving wheel fixing shaft, the driving wheel fixing shaft is provided with a driving belt pulley, the driving wheel fixing shaft is connected with a first motor, the driving belt pulley and the driven belt pulley are connected through a synchronous belt, and the rotating shaft is connected with the driven wheel fixing shaft.

4. The deep groove ball retainer automatic feeding and discharging equipment according to claim 3, characterized in that, The cantilever beam is installed on a rotating disc, the rotating disc is connected with a second motor, and the second motor can drive the cantilever beam to drive the whole feeding and discharging module to rotate.

5. The deep groove ball retainer automatic feeding and unloading apparatus according to claim 4, characterized in that, The lower side of the rotating disc is provided with a lifting cylinder, the lifting cylinder can drive the rotating disc to rise and fall, and the rising and falling of the rotating disc realizes ring taking and finished product storage.

6. The deep groove ball retainer automatic feeding and unloading apparatus according to claim 1, wherein The feeding mechanism and the storage mechanism comprise a plurality of limiting rods, the plurality of limiting rods are surrounded to form a ring-shaped structure and constitute a limiting unit, a lifting disc is arranged at the center of the limiting unit, the lifting disc is lifted to push the stacked rings upwards to facilitate taking, and the lifting disc is lowered to gradually accumulate the finished products to the bottom.

7. The deep groove ball retainer automatic feeding and unloading apparatus according to claim 6, characterized in that, The stock bin management system further comprises a stock bin rotating disc, the stock bin rotating disc is arranged on a stock bin rack, a plurality of limiting units are arranged around the center of the rotating disc on the stock bin rotating disc, the stock bin rotating disc is provided with a plurality of avoidance openings which are matched with the lifting disc in shape and are respectively arranged at the centers of the plurality of limiting units, and the lifting disc can be lowered below the stock bin rotating disc so that the limiting units at different positions are above the lifting disc.

8. The deep groove ball retainer automatic feeding and discharging equipment according to claim 7, characterized in that, A supporting plate is arranged on the upper side of the stock bin rack, the supporting plate is provided with a taking opening and a storage opening, a partition piece is arranged in the circumferential direction of the taking opening, the partition piece separates the top ring from the lower ring to avoid the phenomenon of taking too many rings.

9. The deep groove ball retainer automatic feeding and discharging equipment according to claim 8, characterized in that, The partition piece comprises a check plate which can move in the radial direction, the check plate is provided with a first position and a second position, when the check plate is in the first position, the annular structure formed by the circumferentially arranged check plate has a diameter larger than the outer diameter of the ring so that the top ring passes through the check plate to be above the check plate, and when the check plate is in the second position, the annular structure formed by the circumferentially arranged check plate has a diameter smaller than the outer diameter of the ring so as to be between the top ring and the lower ring to realize separation.

10. The deep groove ball retainer automatic feeding and unloading apparatus according to claim 9, characterized in that, The end of the check plate is in the shape of a right-angled triangle with a downward inclined surface, the check plate is arranged on a supporting block, the top ring abuts against the inclined surface when being lifted to move the check plate away from the center, a spring is arranged in the supporting block, and the spring abuts against the supporting block to reset the check plate. The end of the check plate is in the shape of a right-angled triangle with a downward inclined surface, the check plate is arranged on a supporting block, the top ring abuts against the inclined surface when being lifted to move the check plate away from the center, a spring is arranged in the supporting block, and the spring abuts against the supporting block to reset the check plate.

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