Full-automatic rotating hinge door opening and closing type sterilization cabinet

Abstract

The utility model discloses a full-automatic rotating hinge door opening and closing type sterilization cabinet. An upper supporting seat with a first supporting hole and a lower supporting seat with a second supporting hole are fixedly mounted at the left part of a material inlet and outlet of a sterilization cabinet body; an upper hinge and a lower hinge are fixedly installed on the left portion of the cabinet door, a first through hole penetrating up and down is formed in the upper hinge, and a second through hole penetrating up and down is formed in the lower hinge. The lower end of the main shaft downwards penetrates through the second through hole and the lower plane bearing in sequence and then extends into the second supporting hole, and the main shaft and the lower hinge are fixed in the circumferential direction. The upper end of the main shaft upwards sequentially penetrates through the first supporting hole, the upper plane bearing and the first through hole and then upwards extends out, and the main shaft and the upper hinge are circumferentially fixed; the main shaft is axially positioned by an axial positioning structure, and the main shaft upwards extending out of the first through hole is driven to rotate by a rotary driving device arranged on the sterilization cabinet body. The structure has the advantages that the cabinet door can be automatically opened and closed, the opening angle of the cabinet door can be controlled, and the spindle is convenient to disassemble.

Description

Technical Field

[0001] The utility model relates to the field of sterilizing cabinet equipment, in particular to a full-automatic hinged door-opening sterilizing cabinet. Background Art

[0002] Sterilization cabinet is a kind of equipment that kills bacteria, viruses or other microorganisms by means of high temperature, steam, chemicals or ultraviolet rays. With the continuous improvement of people's quality of life and the continuous upgrading of technology, sterilization cabinets have been widely used in medical institutions, laboratories, food industry, chemical industry, biopharmaceuticals and other fields. The sterilization cabinet is mainly composed of the sterilization cabinet body and the cabinet door set at the material inlet and outlet of the sterilization cabinet body. The cabinet door is usually hinged to the sterilization cabinet body, and a door handle is installed on the cabinet door. The cabinet door is opened and closed by grasping the handle. The manual opening and closing of the cabinet door has problems such as inconvenient operation, safety hazards, and low efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a fully automatic hinged door opening and closing sterilizing cabinet which can automatically open and close the cabinet door, so that the operator no longer needs to manually operate the cabinet door to open and close the cabinet door, thereby reducing safety hazards and improving work efficiency.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: the fully automatic hinged door-opening sterilizing cabinet comprises: a sterilizing cabinet body and a cabinet door; an upper support seat and a lower support seat are fixedly installed on the left part of the material inlet and outlet of the sterilizing cabinet body, a first support hole penetrating from top to bottom is opened on the upper support seat, and a second support hole penetrating from top to bottom is opened on the lower support seat; an upper hinge and a lower hinge are fixedly installed on the left part of the cabinet door, a first through hole penetrating from top to bottom is opened on the upper hinge, and a second through hole penetrating from top to bottom is opened on the lower hinge; the lower end of the main shaft passes through the second through hole and the lower plane bearing downward in sequence and then extends into the second support hole, and the main shaft is circumferentially fixed to the lower hinge; the upper end of the main shaft passes through the first support hole, the upper plane bearing, and the first through hole upward in sequence and then extends upward, and the main shaft is circumferentially fixed to the upper hinge; the main shaft is axially positioned by an axial positioning structure, and the main shaft extending upward out of the first through hole is driven to rotate by a rotary drive device arranged on the sterilizing cabinet body. Driven by the rotary drive device, the main shaft rotates around its own axis in the first support hole and the second support hole, driving the upper hinge and the lower hinge fixed circumferentially therewith to swing synchronously, thereby achieving the purpose of opening or closing the cabinet door.

[0005] The rotary drive device can take many forms, such as setting up a servo motor to drive the main shaft to rotate. However, considering that the height of the sterilization cabinet is relatively high, at least more than two meters, when a power outage occurs during the sterilization process, the medicines will be scrapped due to being in the closed high-temperature sterilization cabinet for a long time. Therefore, it is necessary to open the cabinet door after the power outage to take out the medicines in the sterilization cabinet in time. In response to this demand, this scheme designs the rotary drive device as follows: a base is fixedly provided on the top of the sterilization cabinet body, one end of the motor seat is hinged to the base, and the other end of the motor seat is installed on the base through at least one elastic connection structure; a driving motor with a reduction gear is installed on the motor seat, and a driving bevel gear is fixedly provided on the output shaft of the reduction gear, and a driven bevel gear meshing with the driving bevel gear to form a gear transmission is fixedly provided at the upper end of the main shaft.

[0006] The elastic connection structure is as follows: a connecting rod is provided on the base, an upper external thread section is provided on the upper section of the connecting rod, and an avoidance groove is provided on the motor seat. During the downward swinging of the motor seat around the hinge between the motor seat and the base, the motor seat avoids the connecting rod through the avoidance groove and is placed on the base. After the spring and gasket are sequentially installed on the connecting rod, the upper external thread section is screwed with the locking nut. Under the elastic force of the spring, the two ends of the spring are pressed against the gasket and the motor seat respectively. When the cabinet door needs to be opened after a power outage, it is only necessary to unscrew the locking nut, take out the spring, and swing the motor seat upward around the hinge between the motor seat and the base, so that the active bevel gear and the driven bevel gear can be disengaged. At this time, the cabinet door can be manually pulled to open it.

[0007] The cabinet door is usually opened about 90° to 92°, which can meet the needs of pushing the sterilization cart into the sterilization cabinet and taking the sterilization cart out of the sterilization cabinet. In order to ensure that the cabinet door will not continue to open outward after opening about 90° to 92°, this solution is fixedly provided with a limit rod on the output shaft of the reduction box on the basis of the above, and a travel switch is fixedly provided on the motor seat. The position of the travel switch is the position where the limit rod can trigger the travel switch when the closed cabinet door is driven outward by the gear transmission drive main shaft composed of the active bevel gear and the driven bevel gear; α=90~92°. When the cabinet door is opened at an angle of α, the limit rod can trigger the travel switch. After the travel switch, the drive motor and the control system are associated, the control system can control the action of the drive motor according to the signal fed back by the travel switch to ensure that the cabinet door opening angle does not exceed the α angle. In this way, the cabinet door takes up a space of about a quarter of a semicircle area when it is opened, and other items that will not interfere with the normal movement of the sterilization cabinet can be placed in other free areas, saving space.

[0008] As mentioned above, the height of the sterilization cabinet is more than 2 meters, so the main shaft is usually also more than 2 meters. When the main shaft needs to be disassembled, the main shaft cannot be pulled down, and it is not easy to pull the main shaft upward due to the height limit of the factory building. To solve this problem, the present scheme designs the main shaft into two sections: the main shaft is composed of a first main shaft and a second main shaft; a downwardly protruding block is provided on the lower end face of the first main shaft, and a slot for the block to be embedded is provided downwardly on the upper end face of the second main shaft; the lower end of the second main shaft passes through the second through hole and the lower plane bearing and then extends into the second support hole, and the second main shaft is circumferentially fixed to the lower hinge; the upper end of the second main shaft passes through the first support hole and the upper plane bearing and then extends into the first through hole, the lower end of the first main shaft extends into the first through hole and the block is embedded in the slot, and the first main shaft is circumferentially fixed to the upper hinge.

[0009] Furthermore, in the aforementioned fully automatic hinged door-opening sterilizing cabinet, the first supporting hole is set as an internal threaded hole structure, the upper sleeve with a first external threaded section on the outside is screwed into the first supporting hole, and the second main shaft is movably inserted into the upper sleeve; two symmetrical first planes are cut on the circumference of the first main shaft located at the first through hole, the inner wall of the first plugging hole sleeve corresponds to the outer contour of the first main shaft at the first plane, the first plugging hole sleeve is inserted between the first main shaft and the first through hole, and the first main shaft and the upper sleeve are symmetrical. The hinge is positioned circumferentially; the second supporting hole is set to an internal threaded hole structure, and the lower sleeve with a second external threaded section on the outside is screwed into the second supporting hole from the lower end of the second supporting hole, and the lower end of the second main shaft extends into the lower sleeve; two symmetrical second planes are cut on the circumference of the second main shaft located at the second through hole, and the inner wall of the second plugging hole sleeve corresponds to the outer contour of the second main shaft at the second plane, and the second plugging hole sleeve is inserted between the second main shaft and the second through hole to circumferentially position the second main shaft and the lower hinge.

[0010] Furthermore, in the aforementioned fully automatic hinged door sterilizer, the axial positioning structure is as follows: the lower end opening of the lower sleeve is closed, and an internal threaded hole is provided on the lower end face of the lower sleeve. After the bolt is screwed into the internal threaded hole, it abuts against the lower end face of the second main shaft, thereby axially positioning the main shaft.

[0011] The beneficial effects of the utility model are: first, the cabinet door can be automatically opened and closed, which is easy to operate and safe and reliable to use; second, the cabinet door opening angle can be controlled to save the space occupied by the cabinet door switch; third, the main shaft is easy to disassemble and is not restricted by the height of the factory building. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a partial structural schematic diagram of the fully automatic hinged door opening and closing type sterilizing cabinet described in the utility model.

[0013] Figure 2It is a schematic diagram of the position structure between the main shaft and the upper hinge, the upper support seat, the upper plane bearing, the lower hinge, the lower plane bearing, and the lower support seat.

[0014] Figure 3 yes Figure 2 Schematic diagram of disassembling the spindle.

[0015] Figure 4 yes Figure 1 Schematic diagram of the local enlarged structure of part A.

[0016] Figure 5 yes Figure 4 Schematic diagram of the state where the middle limit rod moves to the position that triggers the travel switch.

[0017] Figure 6 yes Figure 1 Schematic diagram of the local structure from the left viewing direction.

[0018] Figure 7 yes Figure 6 Schematic diagram of the local enlarged structure of part B. DETAILED DESCRIPTION

[0019] The technical solution of the present utility model is further described in detail below in conjunction with the accompanying drawings and preferred embodiments. Embodiment 1

[0020] like Figure 1 , Figure 2 and Figure 3As shown, the fully automatic hinged door-opening sterilizing cabinet described in this embodiment includes: a sterilizing cabinet body 1 and a cabinet door 2. An upper support seat 6 and a lower support seat 7 are fixedly installed on the left part of the material inlet and outlet of the sterilizing cabinet body 1. A first support hole that runs through the upper and lower parts is opened on the upper support seat 6, and a second support hole that runs through the upper and lower parts is opened on the lower support seat 7. Considering the comprehensive factors such as occupied space, aesthetics, and safety of use, the upper support seat 6 and the lower support seat 7 are selected as sleeve structures, which can not only meet the strength of the support main shaft 3, but also save installation space. The outer surface of the sleeve structure is a smooth curved surface and will not cause scratches. An upper hinge 4 and a lower hinge 5 are fixedly installed on the left part of the cabinet door 2. A first through hole that runs through the upper and lower parts is opened on the upper hinge 4, and a second through hole that runs through the upper and lower parts is opened on the lower hinge 5. The lower end of the main shaft 3 passes through the second through hole and the lower plane bearing 12 downwards in sequence and then extends into the second support hole, and the main shaft 3 is circumferentially fixed to the lower hinge 5, at which time the lower plane bearing 12 is sandwiched between the lower hinge 5 and the lower support seat 7. The upper end of the main shaft 3 passes through the first support hole, the upper plane bearing 9, and the first through hole upwards in sequence and then extends upwards, and the main shaft 3 is circumferentially fixed to the upper hinge 4, at which time the upper plane bearing 9 is sandwiched between the upper hinge 4 and the upper support seat 6. The main shaft 3 is axially positioned by the axial positioning structure, and the main shaft 3 extending upward out of the first through hole is driven to rotate by a rotary drive device arranged on the sterilization cabinet body 1. Driven by the rotary drive device, the main shaft 3 rotates around its own axis in the first support hole and the second support hole, driving the upper hinge 4 and the lower hinge 5 circumferentially fixed thereto to swing synchronously, thereby achieving the purpose of opening or closing the cabinet door 2.

[0021] The rotary drive device can be in various forms, such as a servo motor to drive the main shaft 3 to rotate. However, considering that the sterilizer is at a high height, at least two meters, when a power outage occurs during the sterilization process, the drugs will be scrapped due to being in the closed high-temperature sterilizer for a long time. Therefore, it is necessary to open the cabinet door 2 after the power outage to take out the drugs in the sterilizer in time. In response to this demand, this solution designs the rotary drive device as follows: Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, a base 15 is fixedly arranged on the top of the sterilization cabinet body 1, one end of the motor base 16 is hinged on the base, and the other end of the motor base 16 is installed on the base 15 through at least one elastic connection structure; a driving motor 17 with a reduction box is installed on the motor base 16, and a driving bevel gear 18 is fixedly arranged on the output shaft of the reduction box, and a driven bevel gear 20 meshing with the driving bevel gear 18 to form a gear transmission is fixedly arranged at the upper end of the main shaft 3. When working, the power of the driving motor 17 is transmitted to the main shaft 3 through the gear transmission formed by the driving bevel gear 18 and the driven bevel gear 20, forcing the main shaft 3 to rotate. The action of opening and closing the cabinet door 2 is realized by controlling the forward and reverse rotation of the driving motor 17.

[0022] Among them, the elastic connection structure is as follows: a connecting rod 24 is arranged on the base 15, an upper external thread section is arranged on the upper section of the connecting rod 24, and an avoidance groove is arranged on the motor seat 16. During the downward swinging of the motor seat 16 around the hinge between the motor seat 16 and the base 15, the motor seat 16 avoids the connecting rod 24 through the avoidance groove and is placed on the base 15. After the spring 23 and the gasket 22 are sequentially mounted on the connecting rod 24, the connecting rod 24 is screwed with the locking nut 21 through the upper external thread section. Under the elastic force of the spring 23, the two ends of the spring 23 are respectively pressed against the gasket 22 and the motor seat 16. At this time, the spring 23 can also ensure that the active bevel gear 18 can better mesh with the driven bevel gear to ensure the normal operation of the gear transmission. When an emergency situation occurs in which the cabinet door 2 needs to be opened after a power outage, it is only necessary to unscrew the locking nut 21, remove the spring 22, and swing the motor seat 16 upward around the hinge between the motor seat 16 and the base 15, so that the active bevel gear 18 and the driven bevel gear 20 can be disengaged. At this time, the cabinet door 2 can be manually pulled to open the cabinet door 2.

[0023] The structure can realize the purpose of automatically opening and closing the cabinet door, and is easy to operate, safe and reliable to use. Embodiment 2

[0024] When the sterilization cabinet is in use, the cabinet door 2 is usually opened about 90° to 92°, which can meet the needs of pushing the sterilization cart into the sterilization cabinet and taking the sterilization cart out of the sterilization cabinet. In the actual application of the sterilization cabinet, it is limited by the factory space or other factors. In order to better utilize the limited space, this embodiment plans the space occupied by the cabinet door 2 during the opening process on the basis of the first embodiment, as follows:

[0025] like Figure 4 and Figure 5As shown, a limit rod 25 is fixedly arranged on the output shaft of the reduction box, and a travel switch 19 is fixedly arranged on the motor seat 16. The position of the travel switch 19 is the position where the limit rod 25 can trigger the travel switch 19 when the drive motor 17 drives the closed cabinet door 2 to rotate outward at an angle α through the gear transmission drive main shaft 3 composed of the active bevel gear 18 and the driven bevel gear 20, wherein α=90~92°. When the cabinet door 2 opens at an angle α, the limit rod 25 can trigger the travel switch 19. After the travel switch 19 and the drive motor 17 are associated with the control system, the control system can control the action of the drive motor 17 according to the signal fed back by the travel switch 19 to ensure that the opening angle of the cabinet door 2 does not exceed the angle α. In this way, the cabinet door 2 takes up a space of about a quarter of a semicircle area when it is opened, and other items that will not interfere with the normal movement of the sterilizer can be placed in the other free areas, which effectively saves space and has a higher space utilization rate.

[0026] The above structure can control the opening angle of the cabinet door 2, save the space occupied by the cabinet door 2 opening and closing, and improve the space utilization rate. Embodiment 3

[0027] As mentioned above, the height of the sterilization cabinet is usually more than 2 meters, so the main shaft 3 is usually also more than 2 meters. When the main shaft 3 needs to be disassembled, the main shaft 3 cannot be pulled down, and it is not easy to pull the main shaft 3 upward due to the height limit of the factory building. To solve this problem, this embodiment designs the main shaft 3 on the basis of the first embodiment or the second embodiment, and designs the main shaft 3 into two sections: Figure 2 and Figure 3 As shown, the spindle 3 described in this embodiment is composed of a first spindle 31 and a second spindle 32. A downwardly protruding block 312 is provided on the lower end face of the first spindle 31, and a slot 321 for the block 312 to be embedded is provided downwardly on the upper end face of the second spindle 32; the lower end of the second spindle 32 passes through the second through hole and the lower plane bearing 12 and then extends into the second support hole, and the second spindle 32 is circumferentially fixed to the lower hinge 5; the upper end of the second spindle 32 passes through the first support hole and the upper plane bearing 9 and then extends into the first through hole, the lower end of the first spindle 31 extends into the first through hole and the block 312 is embedded in the slot 321, and the first spindle 31 is circumferentially fixed to the upper hinge 4.

[0028] In this embodiment, the first support hole is set as an internal thread hole structure, and the upper sleeve 10 with a first external thread section on the outside is screwed into the first support hole. The second main shaft 32 is movably inserted into the upper sleeve 10. When the upper sleeve 10 is seriously worn and needs to be replaced, only the upper sleeve 10 needs to be replaced. The upper sleeve 10 can be made of self-lubricating material. In addition, in order to facilitate the grip of the upper sleeve 10, a first shaft shoulder 101 is provided on the upper sleeve 10.

[0029] In addition, the first main shaft 31 and the upper hinge 4 are circumferentially fixed in the following manner: two symmetrical first planes 311 are cut on the circumference of the first main shaft 31 located at the first through hole, the inner wall of the first plug hole sleeve 8 corresponds to the outer contour of the first main shaft 31 at the first plane 311, and the first plug hole sleeve 8 is inserted between the first main shaft 31 and the first through hole. The first plug hole sleeve 8 is usually made into a half structure to facilitate the installation of the first plug hole sleeve 8.

[0030] In this embodiment, the second support hole is set to an internal thread hole structure, and the lower sleeve 13 with a second external thread section on the outside is screwed into the second support hole from the lower end of the second support hole, and the lower end of the second main shaft 32 extends into the lower sleeve 13. When the lower sleeve 13 is severely worn and needs to be replaced, it is only necessary to replace the lower sleeve 13, wherein the lower sleeve 13 can be made of self-lubricating material. In addition, in order to facilitate the gripping of the lower sleeve 13, a second shaft shoulder 131 is provided on the lower sleeve 13.

[0031] In addition, the second main shaft 32 and the lower hinge 5 are fixed circumferentially in the following manner: two symmetrical second planes 322 are cut on the circumference of the second main shaft 32 at the second through hole, the inner wall of the second plug hole sleeve 11 corresponds to the outer contour of the second main shaft 32 at the second plane 322, and the second plug hole sleeve 11 is inserted between the second main shaft 32 and the second through hole. The second plug hole sleeve 11 is usually made into a half structure to facilitate the installation of the second plug hole sleeve 11.

[0032] The axial positioning structure of the main shaft 3 can be realized by using a shaft shoulder, a shaft ring, etc. The axial positioning structure of the main shaft 3 in this scheme is as follows: the lower end opening of the lower sleeve 13 is closed, and an internal threaded hole is opened on the lower end face of the lower sleeve 13. After the bolt 14 is screwed into the internal threaded hole, it abuts against the lower end face of the second main shaft 32.

[0033] The above structure has the advantages of easy disassembly of the main shaft and no restriction on the height of the factory building.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The above description is only a preferred embodiment of the present invention and does not constitute any other limitation on the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. Fully automatic hinged door sterilizer, include: The sterilization cabinet body and cabinet door are characterized in that: an upper support seat and a lower support seat are fixedly installed on the left part of the material inlet and outlet of the sterilization cabinet body, a first support hole penetrating up and down is opened on the upper support seat, and a second support hole penetrating up and down is opened on the lower support seat; an upper hinge and a lower hinge are fixedly installed on the left part of the cabinet door, a first through hole penetrating up and down is opened on the upper hinge, and a second through hole penetrating up and down is opened on the lower hinge; the lower end of the main shaft passes through the second through hole and the lower plane bearing downward in sequence and then extends into the second support hole, and the main shaft is circumferentially fixed to the lower hinge; the upper end of the main shaft passes through the first support hole, the upper plane bearing, and the first through hole upward in sequence and then extends upward, and the main shaft is circumferentially fixed to the upper hinge; the main shaft is axially positioned by an axial positioning structure, and the main shaft extending upward out of the first through hole is driven to rotate by a rotating drive device arranged on the sterilization cabinet body.

2. The fully automatic hinged door sterilizing cabinet according to claim 1, Features: The structure of the rotary drive device is as follows: a base is fixedly arranged on the top of the sterilization cabinet body, one end of the motor base is hinged to the base, and the other end of the motor base is installed on the base through at least one elastic connection structure; a driving motor with a reduction gear is installed on the motor base, a driving bevel gear is fixedly arranged on the output shaft of the reduction gear, and a driven bevel gear meshing with the driving bevel gear to form a gear transmission is fixedly arranged at the upper end of the main shaft.

3. The fully automatic hinged door sterilizing cabinet according to claim 2, Features: A limit rod is fixedly arranged on the output shaft of the reduction box, and a travel switch is fixedly arranged on the motor seat. The position of the travel switch is that the limit rod can trigger the travel switch when the driving motor drives the closed cabinet door to rotate outward by an angle α through the gear transmission drive main shaft composed of an active bevel gear and a driven bevel gear; α=90~92°.

4. The fully automatic hinged door sterilizing cabinet according to claim 2 or 3, Features: The elastic connection structure is as follows: a connecting rod is arranged on the base, an upper external thread section is arranged on the upper section of the connecting rod, and an avoidance groove is arranged on the motor seat. During the downward swinging of the motor seat around the hinge between the motor seat and the base, the motor seat avoids the connecting rod through the avoidance groove and is placed on the base. After the spring and gasket are sequentially installed on the connecting rod, the connecting rod is screwed with the locking nut through the upper external thread section. Under the elastic force of the spring, the two ends of the spring are pressed against the gasket and the motor seat respectively.

5. The fully automatic hinged door sterilizing cabinet according to claim 1, Features: The main shaft is composed of a first main shaft and a second main shaft; a downwardly protruding block is arranged on the lower end face of the first main shaft, and a slot for the block to be embedded is opened downwardly on the upper end face of the second main shaft; the lower end of the second main shaft passes through the second through hole and the lower plane bearing and then extends into the second support hole, and the second main shaft is circumferentially fixed to the lower hinge; the upper end of the second main shaft passes through the first support hole and the upper plane bearing and then extends into the first through hole, the lower end of the first main shaft extends into the first through hole and the block is embedded in the slot, and the first main shaft is circumferentially fixed to the upper hinge.

6. The fully automatic hinged door sterilizing cabinet according to claim 5, Features: The first support hole is set to an internal threaded hole structure, the upper sleeve with a first external threaded section on the outside is screwed into the first support hole, and the second main shaft is movably inserted into the upper sleeve; two symmetrical first planes are cut on the circumference of the first main shaft located at the first through hole, the inner wall of the first plug hole sleeve corresponds to the outer contour of the first main shaft at the first plane, and the first plug hole sleeve is inserted between the first main shaft and the first through hole to perform circumferential positioning of the first main shaft and the upper hinge; The second support hole is set to an internal threaded hole structure, and the lower sleeve with a second external thread section on the outside is screwed into the second support hole from the lower end of the second support hole, and the lower end of the second main shaft extends into the lower sleeve; two symmetrical second planes are cut on the circumference of the second main shaft located at the second through hole, and the inner wall of the second plugging hole sleeve corresponds to the outer contour of the second main shaft at the second plane, and the second plugging hole sleeve is inserted between the second main shaft and the second through hole to perform circumferential positioning of the second main shaft and the lower hinge; The axial positioning structure is as follows: the lower end opening of the lower sleeve is closed, an internal threaded hole is opened on the lower end surface of the lower sleeve, and the bolt is screwed into the internal threaded hole and abuts against the lower end surface of the second spindle, thereby axially positioning the spindle.

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