Opening and closing structure of discharge door

Abstract

The invention provides an opening and closing structure of a discharge door, which comprises a processing device, the processing device is provided with a discharge port communicated with the inside and the outside, the discharge door is connected with the discharge port in an opening and closing manner, and the two sides of the processing device in the axial direction of the discharge port are a discharge side and a processing side respectively. The area, right opposite to the discharging opening, of the discharging side of the machining equipment is a discharging area, and on the horizontal plane, the discharging door is suitable for sequentially translating and overturning towards the radial side of the discharging opening through a movable assembly. Compared with an existing unloading door on the unloading port which occupies too much unloading area and is inconvenient to unload in the overturning and opening process, the opening and closing structure of the unloading door has the advantages that under the action of the movable assembly, the unloading door can be overturned after translating for a certain distance in the radial direction of the unloading port, and the unloading door occupies a smaller unloading area in the process.

Description

Technical Field

[0001] The invention relates to the technical field of discharge doors, and in particular to an opening and closing structure of a discharge door. Background Art

[0002] A dryer is a mechanical device that uses heat energy to reduce the moisture in materials. It is used to dry objects. The medicinal material dryer uses hot air to vaporize the moisture in the material (generally refers to water or other volatile liquid components) to obtain medicinal materials with specified moisture content. When drying different medicinal materials, the dryer and the unloading door need to be fully cleaned to avoid cross contamination. The unloading door of the medicinal material dryer is the unloading door panel of the drum-type medicinal material dryer.

[0003] The existing unloading door has the following defects during application:

[0004] The overall structure of the discharge door is large in size and occupies a large discharge area in front of the discharge port during opening, which affects the passage of materials on site and is inconvenient for discharge operations.

[0005] In order to solve the above problems, the present invention proposes an opening and closing structure of a discharge door which occupies a relatively small space in a discharge area in front of a discharge port. Summary of the invention

[0006] In order to solve the problem that a relatively large unloading area space in front of the unloading port is occupied during the opening and closing process of the conventional unloading door, the present invention provides an opening and closing structure of the unloading door.

[0007] According to one object of the present invention, the present invention provides a discharge door, including: processing equipment, a discharge port connecting the inside and the outside of the processing equipment is opened on the processing equipment, the discharge door is opened and closed to connect the discharge port, the processing equipment is located on both sides of the discharge port in the axial direction, namely the discharge side and the processing side, wherein the area of ​​the discharge side of the processing equipment facing the discharge port is the discharge area, and on the horizontal plane, the discharge door is suitable for sequentially translating and flipping toward one radial side of the discharge port through a movable component, wherein the coverage area of ​​the translation and flipping activity trajectory of the discharge door in the discharge area is much smaller than the coverage area of ​​the flipping activity trajectory of the discharge door in the discharge area.

[0008] Preferably, the active component comprises:

[0009] An axial movable part, wherein the discharge door is suitable for circumferential rotation around the discharge port and axial movement of the discharge port through the axial movable part;

[0010] The axial movable part includes a rotating shaft and a supporting part. One end of the rotating shaft is the connecting end of the movable component. The rotating shaft is installed on the supporting part through a linear bearing. The linear bearings are arranged at intervals along the axial direction of the rotating shaft. A thrust plate bearing is installed on the radial outer side of the rotating shaft. The thrust plate bearing is located between two adjacent linear bearings.

[0011] Preferably, an inner groove is machined in the middle of the rotating shaft, and two thrust plate bearings are interference-fitted in the inner groove.

[0012] Preferably, the support member includes a fixed connecting plate and a movable connecting plate, corresponding bolt holes are provided on the fixed connecting plate and the linear bearing, and the movable connecting plate is provided with an adjustment groove arranged along the length direction of the rotating shaft, and the adjustment groove corresponds to the bolt hole on the fixed connecting plate.

[0013] Preferably, a dust box is detachably mounted on the outer side of the support member, and the dust box sealing cover is arranged on the outer sides of the linear bearing and the thrust plate bearing;

[0014] A groove is formed on the outer periphery of the movable connecting plate and / or the fixed connecting plate, and a boss matching the groove is formed on the inner wall of the dustproof box extending inwardly.

[0015] Preferably, the movable assembly further comprises a radial movable member, and the discharge door is suitable for moving radially along the discharge port through the radial movable member;

[0016] The radial movable member comprises a mounting frame, and the mounting frame is provided with a slide rail on both sides of the rotating shaft in the axial direction, respectively. A sliding component is slidably connected to the slide rail, and the supporting member is connected to the sliding component.

[0017] Preferably, the movable assembly further comprises a hinge, the radial movable member is connected to the processing equipment via the hinge, and the discharge door is suitable for turning over on the processing equipment via the hinge;

[0018] The hinged part includes a first hinged part and a second hinged part which are movably connected. The first hinged part is fixedly connected to the processing equipment, the second hinged part is arranged in a vertical direction, the middle part of the second hinged part in the vertical direction is connected to the end of the mounting frame, and a web is arranged between the mounting frame and the second hinged part.

[0019] Preferably, a floating joint is provided between the movable assembly and the discharge door, and a gap is reserved between the floating joint and the discharge door.

[0020] Preferably, the first end of the floating joint is connected to the discharge door, the second end of the floating joint is connected to the connection end of the movable component, the floating joint includes a first part and a second part which are sequentially connected between the first end and the second end, and the floating joint has a stepped structure, wherein the radial dimension of the first part of the floating joint is smaller than the radial dimension of the second part of the floating joint, and a gap is reserved between the second part and the discharge door in the axial direction of the floating joint.

[0021] Preferably, the connection end of the movable component and the second end of the floating joint, as well as the first end of the floating joint and the discharge door are connected by locating pins, and the locating pins are arranged along the radial direction of the floating joint, and an angle is reserved between the two locating pins in the circumferential direction of the floating joint.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] Compared with the existing unloading door on the unloading port, during the flipping and opening process, the unloading door occupies too much unloading area and is inconvenient for unloading operations. The opening and closing structure of the unloading door, under the action of the movable component, the unloading door can first translate a certain distance in the radial direction of the unloading port and then flip over. During the process, the unloading door occupies a smaller unloading area.

[0024] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall opening and closing structure of a discharge door according to the present invention and the connection with the processing equipment;

[0026] Figure 2 It is a schematic diagram of the axial movable parts of the opening and closing structure of a discharge door according to the present invention;

[0027] Figure 3 It is a schematic diagram of one viewing angle of the overall opening and closing structure of a discharge door according to the present invention;

[0028] Figure 4 It is a schematic diagram of another viewing angle of the overall opening and closing structure of a discharge door according to the present invention;

[0029] Figure 5 A schematic diagram of the connection between the middle plate, the reinforcing ribs and the discharge door of the opening and closing structure of the discharge door according to the present invention;

[0030] Figure 6 This is a connection schematic diagram of a floating joint, a rotating shaft and a discharge door of an opening and closing structure of a discharge door described in the present invention. DETAILED DESCRIPTION

[0031] The following description is used to fully explain the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0032] See also Figure 1 The present invention provides a technical solution: an opening and closing structure of a discharge door, comprising a processing equipment 100, wherein a discharge port 101 communicating with the inside and the outside is opened on the processing equipment 100, and the discharge door 200 is connected to the discharge port 101 for opening and closing. The two sides of the processing equipment 100 located on the axial direction of the discharge port 101 are respectively a discharge side and a processing side, wherein the area of ​​the discharge side of the processing equipment 100 facing the discharge port 101 is a discharge area, and on a horizontal plane, the discharge door 200 is suitable for sequentially translating and flipping toward a radial side of the discharge port 101 through a movable component 300.

[0033] The discharge door 200 has at least three working states, namely a closed state, a semi-opened and closed state and an open state. When the discharge door 200 is in a closed state, the discharge door 200 seals the discharge port 101. When the discharge door 200 is in a semi-opened and closed state, the movable component 300 drives the discharge door 200 to translate to one side of the discharge port 101 in a radial direction, and in the axial direction of the discharge port 101, the discharge door 200 partially blocks the discharge port 101. When the discharge door 200 is in an open state, the movable component 300 drives the discharge door 200 in a semi-opened and closed state to flip toward one side of the discharge port 101 in a radial direction, and in the axial direction of the discharge port 101, the discharge door 200 avoids the discharge port 101. Preferably, the flipping angle of the discharge door 200 on the horizontal plane is 90° to 180°.

[0034] Furthermore, the coverage area of ​​the moving track of the unloading door 200 in the unloading region is much smaller than the coverage area of ​​the flipping moving track of the unloading door 200. Preferably, the coverage area of ​​the moving track of the unloading door 200 in the unloading region is not more than one third of the coverage area of ​​the flipping moving track of the unloading door 200.

[0035] Compared with the existing unloading door 200 on the unloading port 101, during the flipping and opening process, the unloading door 200 occupies too much unloading area, which is inconvenient for unloading operations. The opening and closing structure of the unloading door 200 mentioned above, under the action of the movable component 300, the unloading door 200 can first translate a certain distance in the radial direction of the unloading port 101 and then flip over. During the process, the unloading door 200 occupies a smaller unloading area.

[0036] In one embodiment of the present invention, the processing equipment 100 is a drum dryer.

[0037] See also Figure 6 Furthermore, a floating joint 400 is provided between the movable component 300 and the discharge door 200, and a gap 400a is reserved between the floating joint 400 and the discharge door 200. By adding the floating joint 400 and the reserved gap 400a, it is ensured that during the movement of the drum dryer, the movable component 300 will not resonate due to the vibration of the drum.

[0038] For details, see Figure 5 An intermediate plate 201 is provided on the outer side of the discharge door 200, a mounting sleeve 202 is provided at the center of the intermediate plate 201, a first end of the floating joint 400 is plugged into the inner side of the mounting sleeve 202, and a second end of the floating joint 400 is connected to the connection end of the movable component 300.

[0039] For further information, see Figure 5 and 6 The floating joint 400 includes a first portion 401 and a second portion 402 which are sequentially connected between the first end and the second end. The floating joint 400 is in a stepped structure, wherein the radial dimension of the first portion 401 of the floating joint 400 is smaller than the radial dimension of the second portion 402 of the floating joint 400. A connecting groove is provided at the second end of the floating joint 400. The connecting end of the movable component 300 is plugged into the inner side of the connecting groove. A gap 400a is reserved between the second portion 402 and the mounting sleeve 202 in the axial direction of the floating joint 400. The gap 400a is the gap 400a reserved between the floating joint 400 and the discharge door 200 mentioned above. Furthermore, the connection end of the movable assembly 300 and the second end of the floating joint 400, as well as the first end of the floating joint 400 and the mounting sleeve 202 are connected via positioning pins 403, the positioning pins 403 are arranged along the radial direction of the floating joint 400, and the angle between the two positioning pins 403 in the circumferential direction of the floating joint 400 is 90°. This ensures that during the movement of the drum dryer, the movable assembly 300 will not resonate due to the vibration of the drum.

[0040] In order to avoid the deformation of the door panel due to the deadweight of the discharge door 200 and effectively disperse the force, a plurality of reinforcing ribs 203 are further provided between the discharge door 200 and the intermediate plate 201, and the reinforcing ribs 203 are arranged at equal intervals around the circumference of the discharge door 200 and the intermediate plate 201. Furthermore, one end of the reinforcing rib 203 is connected to the outer wall of the mounting sleeve 202, and the thickness of the reinforcing rib 203 gradually increases as it approaches the mounting sleeve 202. Considering the weight and reinforcement effectiveness of the intermediate plate 201, further, the intermediate plate 201 and the discharge door 200 are connected by bolts, which are respectively positioned at the circular plate and the end of the reinforcing rib 203. In one embodiment, the intermediate plate 201 is a circular intermediate plate 201, and the number of the reinforcing ribs 203 is 4, and the reinforcing ribs 203 are arranged at equal angles along the circumference of the intermediate plate 201.

[0041] Regarding the specific structure of the movable component 300, the movable component 300 includes:

[0042] An axial movable member 301, wherein the discharge door 200 is adapted to rotate circumferentially around the discharge port 101 and to move axially of the discharge port 101 through the axial movable member 301;

[0043] A radial movable member 302, wherein the discharge door 200 is adapted to move radially along the discharge port 101 through the radial movable member 302;

[0044] The hinge 303 , the radial movable member 302 is connected to the processing equipment 100 via the hinge 303 , and the discharge door 200 is suitable for flipping on the processing equipment 100 via the hinge 303 .

[0045] See also Figure 2The axial movable part 301 includes a rotating shaft 3011 and a supporting part 3012. One end of the rotating shaft 3011 is the connecting end of the movable component 300. The rotating shaft 3011 is installed on the supporting part 3012 through a linear bearing 3013. The linear bearings 3013 are arranged at intervals along the axial direction of the rotating shaft 3011. A thrust plate bearing 3014 is installed on the radial outer side of the rotating shaft 3011. The thrust plate bearing 3014 is located between two adjacent linear bearings 3013. The axial movable part 301 is a combination of a linear bearing 3013 and a thrust plate bearing 3014. The two linear bearings 3013 are arranged at both ends of the rotating shaft 3011 respectively to ensure the straightness of the rotating shaft 3011. The linear bearing 3013 limits the thrust plate bearing 3014 in the axial direction of the rotating shaft 3011. When in use, the unloading door 200 can move axially through the rotating shaft 3011 with the assistance of the linear bearing 3013. When the end faces of the thrust plate bearing 3014 and the linear bearing 3013 are in contact, they can rotate, thereby realizing the synchronous rotation of the unloading door 200 and the cylinder.

[0046] Furthermore, an inner groove is machined in the middle of the rotating shaft 3011, and two thrust plate bearings 3014 are interference-fitted in the inner groove. Preferably, the inner ring of the thrust plate bearing 3014 is completely placed in the inner groove, so as to ensure the positioning of the rotating shaft 3011 and avoid excessive movement of the discharge door 200 when the drum body rotates, resulting in wear of the positioning shaft shoulder and the linear bearing 3013.

[0047] Further, the linear bearing 3013 is connected to the support member 3012 by bolts. In one embodiment, the linear bearing 3013 is provided with four bolt holes 30124, and the support member 3012 is provided with corresponding bolt holes 30124. The support member 3012 includes a fixed connecting plate 30121 and a movable connecting plate 30122. The fixed connecting plate 30121 and the linear bearing 3013 are provided with corresponding bolt holes 30124. The movable connecting plate 30122 is provided with an adjustment groove 30123 arranged along the length direction of the rotating shaft 3011, and the adjustment groove 30123 corresponds to the bolt hole 30124 on the fixed connecting plate 30121. In one embodiment, the bolt hole 30124 on the fixed connecting plate 30121 is a countersunk hole, and the adjustment groove 30123 is a waist-shaped adjustment groove 30123. During the initial installation, the position of the movable connecting plate 30122 can be adjusted according to the position of the drying cylinder to ensure that the positioning shoulder is located between the two linear bearings 3013, wherein the bolts can be installed in the corresponding positions of the adjustment grooves 30123 to achieve adjustment of the movable connecting plate 30122.

[0048] Furthermore, a dust box 3015 is detachably mounted on the outer side of the support member 3012, and a sealing cover of the dust box 3015 is arranged on the outer side of the linear bearing 3013 and the thrust plate bearing 3014. Specifically, a groove is provided on the outer periphery of the movable connecting plate 30122 and / or the fixed connecting plate 30121, and preferably, the groove is machined, and the inner wall of the dust box 3015 extends inward to form a boss matching the groove, and the groove and the boss designed in the dust box 3015 are combined to form a seal to prevent dust from contaminating the bearing.

[0049] See also Figure 3 and 4 The radial movable member 302 includes a mounting frame 3021, and the mounting frame 3021 is provided with a 65 cm long heavy-duty slide rail 3022 on both sides of the rotating shaft 3011 in the axial direction. The slide rail 3022 is slidably connected with a sliding component. The movable connecting plate 30122 extends downward to form a vertical plate, and the vertical plate is bolted to the sliding component. Under the premise of ensuring stability, the space occupied by the discharge door 200 when it is retracted is shortened as much as possible.

[0050] In one embodiment, the opening and closing of the discharge door 200 is achieved by hinges between the mounting frame 3021 and the processing device.

[0051] Furthermore, the hinge 303 includes a first hinge part 3031 and a second hinge part 3032 that are movably connected, the first hinge part 3031 is fixedly connected to the processing equipment 100, the second hinge part 3032 is arranged in the vertical direction, the middle part of the second hinge part 3032 in the vertical direction is connected to the end of the mounting frame 3021, and a web 3033 is provided between the mounting frame 3021 and the second hinge part 3032 to ensure the stability of the structure.

[0052] Furthermore, the opening and closing structure of the unloading door 200 is made of SUS304 stainless steel as a whole, which has the characteristics of corrosion resistance and high temperature resistance. Considering the area of ​​the unloading door 200, the force on the locking position, and the convenience of disassembly and cleaning, a thinner plate is used. Preferably, the thickness of the plate is 2mm, and the mounting frame 3021 part adopts a rectangular tube, a machined module, etc. Preferably, the mounting frame 3021 part adopts a 70*50*4 rectangular tube; the sliding guide rail and the axial movable part 301 and other structures are all fixed with threads to achieve quick disassembly between the parts.

[0053] In summary, in view of the problem that the hand wheel structure currently used in the market may cause the teeth to be backed out due to the vibration during the rotation of the drum, and the failure to lock may cause leakage or even the entire discharge door 200 to fall off, causing safety hazards, and does not meet the workshop use and production safety requirements, the opening and closing structure of the discharge door 200 is provided with a floating joint 400 between the discharge door 200 and the movable component 300, and a gap 400a is reserved between the floating joint 400 and the discharge door 200, and the angle between the two positioning pins 403 on the floating joint 400 is further limited, so as to ensure that during the movement of the drum dryer, the support frame will not resonate due to the vibration of the drum;

[0054] In view of the fact that the existing unloading door 200 on the market has no synchronous rotation structure and only uses a hand wheel to lock, which cannot be quickly disassembled, the opening and closing structure of the unloading door 200, the axial movable part 301 adopts the combination of a linear bearing 3013 and a thrust plate bearing 3014, and the two linear bearings 3013 are respectively placed at both ends of the rotating shaft 3011 to ensure the straightness of the rotating shaft 3011. The linear bearing 3013 cooperates with the thrust plate bearing 3014 to realize the synchronous rotation of the unloading door 200 through the rotating shaft 3011;

[0055] In view of the fact that there is no effective dust-proof quick-release device designed on the market, which leads to frequent damage and replacement of components, the opening and closing structure of the discharge door 200 and the components of the axial movable part 301 are fixed by bolts, and a dust-proof box 3015 is sealed on the outside of the bearing to prevent dust from contaminating the bearing;

[0056] In view of the fact that most of the unloading door 200 bracket structures on the market have large volume, and the unloading door 200 occupies the unloading area space after opening, which is inconvenient for unloading operations, the opening and closing structure of the unloading door 200 is such that the unloading door 200 first moves to the radial side of the unloading port 101 through the movable component 300, and then the unloading door 200 is flipped, so as to shorten the unloading space occupied by the unloading door 200 when it is retracted as much as possible.

[0057] The embodiments described above are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited only by this embodiment, that is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A discharge door (200) opening and closing structure, comprising a processing device (100), wherein the processing device (100) is provided with a discharge port (101) communicating with the inside and outside, wherein the discharge door (200) is opened and closed to connect the discharge port (101), wherein the two sides of the processing device (100) located on the axial direction of the discharge port (101) are respectively a discharge side and a processing side, wherein the area of ​​the discharge side of the processing device (100) facing the discharge port (101) is a discharge area, and wherein: On a horizontal plane, the discharge door (200) is suitable for sequentially translating and flipping toward one radial side of the discharge port (101) through a movable component (300), wherein the coverage area of ​​the translation and flipping activity track of the discharge door (200) in the discharge area is much smaller than the coverage area of ​​the flipping activity track of the discharge door (200) in the discharge area.

2. The opening and closing structure of a discharge door (200) according to claim 1, characterized in that: The movable component (300) comprises: An axial movable part (301), wherein the discharge door (200) is suitable for circumferential rotation around the discharge port (101) and axial movement of the discharge port (101) through the axial movable part (301); The axial movable part (301) comprises a rotating shaft (3011) and a supporting part (3012), one end of the rotating shaft (3011) is a connecting end of the movable component (300), the rotating shaft (3011) is mounted on the supporting part (3012) via a linear bearing (3013), the linear bearings (3013) are arranged at intervals along the axial direction of the rotating shaft (3011), a thrust plate bearing (3014) is mounted on the radial outer side of the rotating shaft (3011), and the thrust plate bearing (3014) is located between two adjacent linear bearings (3013).

3. The opening and closing structure of a discharge door (200) according to claim 2, characterized in that: An inner groove is machined in the middle of the rotating shaft (3011), and two thrust plate bearings (3014) are interference-fitted in the inner groove.

4. The opening and closing structure of a discharge door (200) according to claim 2, characterized in that: The support member (3012) includes a fixed connecting plate (30121) and a movable connecting plate (30122), and corresponding bolt holes (30124) are provided on the fixed connecting plate (30121) and the linear bearing (3013), and the movable connecting plate (30122) is provided with an adjustment groove (30123) arranged along the length direction of the rotating shaft (3011), and the adjustment groove (30123) corresponds to the bolt hole (30124) on the fixed connecting plate (30121).

5. The opening and closing structure of a discharge door (200) according to claim 2, characterized in that: A dustproof box (3015) is detachably mounted on the outer side of the support member (3012), and a sealing cover of the dustproof box (3015) is arranged on the outer sides of the linear bearing (3013) and the thrust plate bearing (3014); A groove is provided on the outer periphery of the movable connecting plate (30122) and / or the fixed connecting plate (30121), and the inner wall of the dustproof box (3015) extends inward to form a boss matching the groove.

6. The opening and closing structure of a discharge door (200) according to claim 2, characterized in that: The movable assembly (300) further comprises a radial movable member (302), and the discharge door (200) is suitable for moving in the radial direction of the discharge port (101) through the radial movable member (302); The radial movable member (302) comprises a mounting frame (3021), and the mounting frame (3021) is provided with a slide rail (3022) on both sides of the rotating shaft (3011) in the axial direction, respectively. A sliding component is slidably connected to the slide rail (3022), and the support member (3012) is connected to the sliding component.

7. The opening and closing structure of a discharge door (200) according to claim 6, characterized in that: The movable assembly (300) further comprises a hinge (303), the radial movable member (302) is connected to the processing equipment (100) via the hinge (303), and the discharge door (200) is suitable for turning over on the processing equipment (100) via the hinge (303); The hinged member (303) includes a first hinged portion (3031) and a second hinged portion (3032) that are movably connected, the first hinged portion (3031) is fixedly connected to the processing equipment (100), the second hinged portion (3032) is arranged in a vertical direction, the middle portion of the second hinged portion (3032) in the vertical direction is connected to the end portion of the mounting frame (3021), and a web (3033) is arranged between the mounting frame (3021) and the second hinged portion (3032).

8. The opening and closing structure of a discharge door (200) according to claim 1, characterized in that: A floating joint (400) is provided between the movable assembly (300) and the discharge door (200), and a gap (400a) is reserved between the floating joint (400) and the discharge door (200).

9. The opening and closing structure of a discharge door (200) according to claim 8, characterized in that: The first end of the floating joint (400) is connected to the discharge door (200), and the second end of the floating joint (400) is connected to the connection end of the movable component (300). The floating joint (400) comprises a first part (401) and a second part (402) which are sequentially connected between the first end and the second end. The floating joint (400) is in a stepped structure, wherein the radial dimension of the first part (401) of the floating joint (400) is smaller than the radial dimension of the second part (402) of the floating joint (400), and a gap (400a) is reserved between the second part (402) and the discharge door (200) in the axial direction of the floating joint (400).

10. The opening and closing structure of a discharge door (200) according to claim 8, characterized in that: The connection end of the movable component (300) and the second end of the floating joint (400), as well as the first end of the floating joint (400) and the discharge door (200) are connected via positioning pins (403). The positioning pins (403) are arranged along the radial direction of the floating joint (400), and an angle is reserved between two positioning pins (403) in the circumferential direction of the floating joint (400).

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