A modular one-machine-three-type quick switching method of malus hallings fruit separator
By releasing the locking handle to drive the rotating component, the separation component of the crabapple fruit separator can be quickly replaced, solving the problem of inconvenient screen replacement in the existing technology and improving the efficiency of screen size switching.
Patent Information
- Application Number
- CN202611410430.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-11
- Publication Date
- 2026-11-06
AI Technical Summary
The existing crabapple fruit separator is inconvenient to disassemble when changing the screening screen, resulting in low efficiency in switching screening sizes.
By releasing the locking handle from the locking component, moving the locking handle causes the rotating component to rotate, releasing the locking of the separation component, moving the separation component and inserting the appropriate separation component, positioning it with the positioning component and then locking it, thus achieving quick replacement of the separation component.
The separation components can be replaced quickly without tools, reducing disassembly time and improving the efficiency of screen size switching.
Smart Images

Figure CN123039042A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of crabapple processing technology, and in particular to a modular, three-type quick-switching method for a crabapple separator. Background Technology
[0002] Crabapple, a common fruit, is mostly spherical, about 2-3 centimeters in diameter. When ripe, the skin turns from greenish-yellow to bright red, with a smooth surface. Some varieties, such as the eight-ridged crabapple, have angular edges. The fruit has a firm texture, making it easy to store for a long time.
[0003] Currently, in the processing of crabapples, it is necessary to separate the crabapples, mainly to separate crabapples of different outer diameters and to remove stains from the crabapples. Therefore, crabapple separators are generally used. These separators mainly rely on a rotating drum to tumble the crabapples, thereby separating crabapples of different outer diameters and removing some stains.
[0004] However, the aforementioned rollers generally rely on screening screens for separation, but the screening screens are usually fixed to the rollers by connectors. When it is necessary to change the screening size, the screening screen needs to be replaced, but disassembly is inconvenient. Therefore, we propose a modular three-type quick switching method for crabapple fruit separators. Summary of the Invention
[0005] The purpose of this invention is to provide a modular, three-type quick-switching method for crabapple fruit separators to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a modular, three-type quick-switching method for a crabapple fruit separator, comprising the following specific steps:
[0007] Step 1: First, release the locking handle from the locking component. Then, move the locking handle so that it drives the rotating component to rotate, thereby moving the locking component and releasing it from the locking component.
[0008] Step 2: Then move the separation component outwards, so that the separation component moves along the positioning component until the separation component is removed from the rotating component;
[0009] Step 3: Select a suitable separation component, insert the separation component into the rotating component along with the positioning component, and use the positioning component for positioning;
[0010] Step 4: Then move the locking handle in the opposite direction to reset the rotating component and lock the separating component. Then use the locking handle to lock the locking component again.
[0011] Step 5: Then, use the drive mechanism on the bracket to drive the rotating component and its separation component to rotate, thereby separating the crabapple fruit.
[0012] Preferably, a first fixing ring is fixedly connected to one side of the top of the bracket, and a second fixing ring is fixedly connected to the other side of the top of the bracket, with the rotating component located between the first fixing ring and the second fixing ring.
[0013] Preferably, both the first fixing ring and the second fixing ring include a fixing ring body fixedly connected to the top of the bracket, a circular cavity opened inside the fixing ring body, and slots opened on both sides of the bottom of the fixing ring body;
[0014] A circular cover is fixedly connected to one side of the first fixing ring.
[0015] Preferably, the rotating component includes:
[0016] A fixed shaft is rotatably disposed inside the circular cover;
[0017] A rotating gear, which is fixedly connected to the outside of a fixed shaft;
[0018] A rotating ring is located outside the rotating gear, and rotating teeth are fixedly connected inside the rotating ring, and the rotating teeth mesh with the rotating ring.
[0019] Preferably, the locking component includes:
[0020] A rotating circular block, which is fixedly connected to one side of a rotating gear;
[0021] A locking block is fixedly connected to one side of the rotating circular block, and the thickness of the locking block gradually increases from one side to the other.
[0022] A rubber pad is fixedly connected to one side of the locking block.
[0023] Preferably, the locking handle includes:
[0024] A sliding groove is provided on one side of the circular cover, and a locking groove is provided at one end of the sliding groove, with the inner contour of the locking groove being elliptical.
[0025] A threaded rod is fixedly connected to the outside of a rotating ring. A locking sleeve is threaded onto the outer surface of the threaded rod, and the outer contour of the bottom of the locking sleeve is conical.
[0026] Preferably, the rotating assembly includes:
[0027] A rotating ring is rotatably disposed inside a circular cavity, and rotating teeth are fixedly connected to the outer side of the rotating ring;
[0028] The second annular piece and the first annular piece are respectively fixedly connected to the inner side of the corresponding rotating ring, and the second annular piece is located inside the second fixed ring, and the first annular piece is located inside the first fixed ring.
[0029] A connecting piece is fixedly connected between the second annular piece and the first annular piece.
[0030] Preferably, the separation assembly includes a separation screen, an outer ring fixedly connected to the end of the separation screen, and a guide ring fixedly connected to one side of one of the outer rings.
[0031] Preferably, the positioning component includes:
[0032] A connecting block, which is fixedly connected to the inner side of the rotating assembly;
[0033] A positioning post is fixedly connected to one side of a connecting block, and a positioning block is fixedly connected to one side of the positioning post.
[0034] The first positioning hole is located on the outer side of one of the outer rings, and a first through groove is provided on one side of the first positioning hole.
[0035] The second positioning hole is located on the outer side of another outer ring. A second through groove is provided on one side of the second positioning hole, and the inner contour of the second positioning hole is adapted to the outer contour of the positioning block.
[0036] Preferably, the inner contour of the second annular piece is folded up, and the end face of the positioning block is fixedly connected to the inner wall of the second annular piece. The outer contour of the positioning block is conical.
[0037] The technical effects and advantages of this invention are as follows:
[0038] 1. This invention involves releasing the locking handle from the locking component, then moving the locking handle to rotate the rotating component, thereby releasing the locking component from the separating component. The separating component is then moved outward until it is removed from the rotating component. A separating component that matches the required size of the crabapple is selected and inserted into the rotating component along the positioning component, where it is positioned. The locking handle is then used to reset the rotating component, locking the separating component in place. Finally, the locking handle is used to lock the locking component again, thus completing the replacement of the separating component. This process eliminates the need for any tools for disassembly and reduces disassembly time.
[0039] 2. In this invention, the rotating ring reverses and the rotating gear drives the rotating block to rotate, so that the thinner side of the locking block first comes into close contact with the separation component. As the rotating block rotates further, the difference in thickness of the locking block makes the locking block gradually come into close contact with and squeeze the separation component, thereby achieving the locking of the separation component by the locking component. Attached Figure Description
[0040] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:
[0041] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0042] Figure 2 For the present invention Figure 1 A magnified view of the structure at point A in the middle;
[0043] Figure 3 This is a schematic diagram of the positioning component structure of the present invention;
[0044] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the middle;
[0045] Figure 5 For the present invention Figure 3 A magnified schematic diagram of the structure at point C in the middle;
[0046] Figure 6 This is a schematic diagram of the separation component structure of the present invention;
[0047] Figure 7 This is a schematic diagram of the locking component structure of the present invention.
[0048] In the attached image:
[0049] 1. Bracket; 2. Drive mechanism; 3. First fixing ring; 301. Fixing ring body; 302. Cavity; 303. Groove; 304. Circular cover; 4. Second fixing ring; 5. Rotating assembly; 501. Rotating ring; 502. Rotating teeth; 503. Second annular plate; 504. First annular plate; 505. Connecting plate; 6. Positioning assembly; 601. Connecting block; 602. Positioning post; 603. Positioning block; 604. First positioning hole; 605. First through groove; 606 607. Second positioning hole; 708. Second through groove; 709. Separation assembly; 701. Separation screen; 702. Outer ring; 703. Guide ring; 8000. Rotation assembly; 801. Fixed shaft; 802. Rotating gear; 803. Rotating ring; 804. Rotating teeth; 900. Locking assembly; 901. Rotating block; 902. Locking block; 903. Rubber pad; 10. Locking handle; 1001. Slide groove; 1002. Locking groove; 1003. Threaded rod; 1004. Locking sleeve. Detailed Implementation
[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0051] This invention provides, for example Figures 1-7 This illustrates a modular, three-type quick-switching method for a crabapple fruit separator.
[0052] Example 1: Includes the following specific steps:
[0053] Step 1: First, release the locking handle 10 from locking the locking component 9. Then, move the locking handle 10 so that it drives the rotating component 8 to rotate, thereby moving the locking component 9 and releasing the locking component 9 from locking the separation component 7.
[0054] Step 2: Then move the separating component 7 outwards, so that the separating component 7 moves along the positioning component 6 until the separating component 7 is removed from the rotating component 5;
[0055] Step 3: Select a suitable separation component 7, insert the separation component 7 into the rotating component 5 along the positioning component 6, and use the positioning component 6 for positioning;
[0056] Step 4: Then move the locking handle 10 in the opposite direction so that the rotating component 8 drives the locking component 9 to reset. Use the locking component 9 to lock the separating component 7, and then use the locking handle 10 to lock the locking component 9.
[0057] Step 5: Then, use the drive mechanism 2 on the bracket 1 to drive the rotating component 5 and its separation component 7 to rotate, thereby separating the crabapple fruit.
[0058] When it is necessary to switch the size of the separated crabapple, first release the locking handle 10 from the locking component 9, then move the locking handle 10 so that the locking handle 10 drives the rotating component 8 to rotate, thereby moving the locking component 9 and releasing the locking component 9 from the locking component 7. Then move the separating component 7 outward so that the separating component 7 moves along the positioning component 6 until the separating component 7 is removed from the rotating component 5. Select the separating component 7 that matches the required size of the separated crabapple, insert the separating component 7 into the rotating component 5 along the positioning component 6, and use the positioning component 6 to position it. Then move the locking handle 10 in the opposite direction so that the rotating component 8 drives the locking component 9 to reset, using the locking component 9 to lock the separating component 7. Then use the locking handle 10 to lock the locking component 9 again. At this point, the replacement of the separating component 7 is completed.
[0059] During actual separation, the drive mechanism 2 on the support 1 drives the rotating component 5 and its separation component 7 to rotate. Then, the crabapple is put into the separation component 7, and the crabapple is tumbled by the flipping separation component 7, thereby achieving the separation of crabapples of different sizes and the separation of stains.
[0060] Furthermore, a first fixing ring 3 is fixedly connected to one side of the top of the support 1, and a second fixing ring 4 is fixedly connected to the other side of the top of the support 1. The rotating component 5 is located between the first fixing ring 3 and the second fixing ring 4. The first fixing ring 3, the second fixing ring 4 and the support 1 are used to support the rotating component 5, so that the rotating component 5 can rotate under the drive of the drive mechanism 2. At the same time, the support 1 can be set at an angle, for example, the first fixing ring 3 is higher than the second fixing ring 4, so that the separation component 7 is tilted, which facilitates the separation of crabapples. This is common in the existing inclined drum screen.
[0061] Furthermore, both the first fixing ring 3 and the second fixing ring 4 include a fixing ring body 301 fixedly connected to the top of the bracket 1, a circular cavity 302 opened inside the fixing ring body 301, and slots 303 opened on both sides of the bottom of the fixing ring body 301; wherein a circular cover 304 is fixedly connected to one side of the fixing ring body 301 of the first fixing ring 3; the fixing ring body 301 is used to connect with the bracket 1 to form a support, the circular cavity 302 facilitates the rotation of the rotating component 5 within the circular cavity 302, and the circular cover 304 fixedly connected to the fixing ring body 301 of the first fixing ring 3 facilitates the accommodation of the rotating component 8 and the locking component 9.
[0062] Furthermore, the rotating assembly 8 includes a fixed shaft 801, which is rotatably disposed inside the dome 304. A rotating gear 802 is fixedly connected to the outside of the fixed shaft 801. A rotating ring 803 is located outside the rotating gear 802, and a rotating tooth 804 is fixedly connected inside the rotating ring 803, and the rotating tooth 804 meshes with the rotating ring 803. By moving the locking handle 10, the locking handle 10 drives the rotating ring 803 to rotate along the inside of the dome 304. By utilizing the engagement of the rotating tooth 804 and the rotating gear 802, the fixed shaft 801 is rotated. Thus, by moving the locking handle 10, the rotating assembly 8 is rotated, which in turn drives the locking assembly 9 to move. For example, the clockwise rotation of the rotating ring 803 releases the locking assembly 9 from locking the separation assembly 7, and the counterclockwise rotation of the rotating ring 803 locks the locking assembly 9 into locking the separation assembly 7.
[0063] Furthermore, the locking component 9 includes a rotating circular block 901, which is fixedly connected to one side of the rotating gear 802. A locking block 902 is fixedly connected to one side of the rotating circular block 901. The thickness of the locking block 902 gradually increases from one side to the other. A rubber pad 903 is fixedly connected to one side of the locking block 902. For example, when the rotating ring 803 rotates clockwise, the rotating gear 802 drives the rotating circular block 901 to rotate, thereby driving the locking block 902 to rotate. This causes the locking block 902 to gradually move away from the separating component 7 and rotate into the interior of the circular cover 304, where it no longer limits the separation component 7, thus facilitating the removal of the separation component 7. For example, when the rotating ring 803 rotates counterclockwise, the rotating gear 802 drives the rotating circular block 901 to rotate, causing the thinner side of the locking block 902 to first press against the separation component 7. As the rotating circular block 901 rotates further, the difference in thickness of the locking block 902 causes it to gradually press against and squeeze the separation component 7, thereby achieving the locking of the separation component 7 using the locking component 9.
[0064] Furthermore, the locking handle 10 includes a slide groove 1001, which is formed on one side of the circular cover 304. One end of the slide groove 1001 has a locking groove 1002, the inner contour of which is elliptical. A threaded rod 1003 is fixedly connected to the outer side of the rotating ring 803. A locking sleeve 1004 is threaded onto the outer surface of the threaded rod 1003, and the outer contour of the bottom of the locking sleeve 1004 is conical. When it is necessary to release the locking handle 10, the locking sleeve 1004 is rotated, causing it to gradually move out of the locking groove 1002, thus preventing the locking sleeve 1004 from contacting and limiting the locking groove 1002. Then, the locking handle 10 moves along the slide groove 1001. This causes the threaded rod 1003 to move along the slide groove 1001, thereby driving the rotation of the rotating ring 803. This achieves the forward rotation of the rotating ring 803, which means releasing the locking component 9 from the locking component 7. When the locking handle 10 is moved in the reverse direction, the threaded rod 1003 moves from the slide groove 1001 into the locking groove 1002. Then, the locking sleeve 1004 is reversed, causing the locking sleeve 1004 to move downward along the threaded rod 1003. The conical bottom of the locking sleeve 1004 presses against one side of the locking groove 1002 and continues to move downward, causing the locking block 902 to rotate further and further press the rubber pad 903, thereby producing a locking effect and preventing the locking component 9 from failing to achieve a good locking effect.
[0065] Furthermore, the rotating assembly 5 includes a rotating ring 501, which is rotatably disposed inside the circular cavity 302. Rotating teeth 502 are fixedly connected to the outer side of the rotating ring 501. The second annular plate 503 and the first annular plate 504 are respectively fixedly connected to the inner side of the corresponding rotating ring 501. The second annular plate 503 is located inside the second fixed ring 4, and the first annular plate 504 is located inside the first fixed ring 3. The connecting piece 505 is fixedly connected between the second annular plate 503 and the first annular plate 504. The rotating ring 501 is driven to rotate by the driving mechanism 2, thereby driving the first annular plate 504 and the second annular plate 503 to rotate, thus facilitating the rotation of the positioning assembly 6 and its separation assembly 7 together.
[0066] Furthermore, the separation component 7 includes a separation screen 701, an outer ring 702 fixedly connected to the end of the separation screen 701, and a guide ring 703 fixedly connected to one side of one of the outer rings 702. The guide ring 703 is first inserted into the second fixed ring 4 along the first fixed ring 3 until the guide ring 703 extends out of the second fixed ring 4. The separation component 7 is rotated by the rotating component 5, which facilitates separation using the separation screen 701 to separate crabapples of different sizes. The guide ring 703 can be used to guide the discharge.
[0067] Furthermore, the positioning component 6 includes a connecting block 601, which is fixedly connected to the inner side of the rotating component 5. A positioning post 602 is fixedly connected to one side of the connecting block 601, and a positioning block 603 is fixedly connected to one side of the positioning post 602. A first positioning hole 604 is opened on the outer side of one of the outer rings 702, and a first through groove 605 is opened on one side of the first positioning hole 604. A second positioning hole 606 is opened on the outer side of the other outer ring 702, and a second through groove 607 is opened on one side of the second positioning hole 606. The inner contour of the second positioning hole 606 is adapted to the outer contour of the positioning block 603. The guide ring 703 is inserted along the second fixing ring 4, and the second positioning hole 606 is inserted into the positioning post 602. The positioning post 602 is used for positioning, thereby guiding the installation until the second positioning hole 606 abuts against the positioning block 603.
[0068] Furthermore, the inner contour of the second annular piece 503 is folded up, and the end face of the positioning block 603 is fixedly connected to the inner wall of the second annular piece 503. The outer contour of the positioning block 603 is conical. The folded-up second annular piece 503 is for convenient positioning of the separation component 7. The first annular piece 504 is for convenient insertion of the separation component 7 into the rotating component 5. In the later locking state of the locking handle 10, that is, when the locking sleeve 1004 moves down, the locking block 902 will further squeeze the separation component 7, so that the second positioning hole 606 and the positioning block 603 fit tightly together. Thus, the positioning component 6 plays a good positioning role for the separation component 7. At the same time, the inner diameter of the first positioning hole 604 is matched with the outer diameter of the positioning post 602, thereby avoiding large shaking after the separation component 7 is installed, making the installation more stable.
[0069] Example 2: Example 2 further discloses that, based on Example 1, a ball bearing can be embedded on the outer side of the rotating ring 501, and a concave annular track is provided on the inner wall of the cavity 302, and the annular track is used for the ball bearing to roll, thereby reducing the friction caused by the rotation of the rotating ring 501.
[0070] Example 3: Example 3 further discloses, based on Example 1, that the drive mechanism 2 can be obtained from the prior art. Here, one method is described: the rotating shaft is rotatably mounted on the bracket 1, and a rotating gear is mounted on the rotating shaft. The position of the rotating gear corresponds to the position of the slot 303. The rotating gear passes through the slot 303 and meshes with the rotating teeth 502 on the rotating ring 501. Then, the rotating shaft is driven to rotate by a motor, thereby driving the rotating gear and its rotating ring 501 to rotate. The motor can be controlled by a control panel. The control panel is equipped with a processor. By setting different motor speeds for different sizes of crabapples, switching can be achieved. For example, the motor speeds of three different sizes of crabapples can be set to achieve three-type switching.
[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A modular, three-type quick-switching method for a crabapple fruit separator, characterized in that, The specific steps include the following: Step 1: First, release the locking handle (10) from locking the locking component (9), then move the locking handle (10) so that the locking handle (10) drives the rotating component (8) to rotate, thereby driving the locking component (9) to move, so that the locking component (9) releases the locking component (9) from locking the separation component (7); Step 2: Then move the separation component (7) outward so that the separation component (7) moves along the positioning component (6) until the separation component (7) is removed from the rotating component (5); Step 3: Select a suitable separation component (7), insert the separation component (7) into the rotating component (5) along the positioning component (6), and use the positioning component (6) for positioning; Step 4: Then move the locking handle (10) in the opposite direction so that the rotating component (8) drives the locking component (9) to reset. Use the locking component (9) to lock the separating component (7), and then use the locking handle (10) to lock the locking component (9). Step 5: Then, use the drive mechanism (2) on the bracket (1) to drive the rotating component (5) and its separation component (7) to rotate, thereby separating the crabapple fruit.
2. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 1, characterized in that, A first fixing ring (3) is fixedly connected to one side of the top of the bracket (1), and a second fixing ring (4) is fixedly connected to the other side of the top of the bracket (1), and the rotating component (5) is located between the first fixing ring (3) and the second fixing ring (4).
3. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 2, characterized in that, The first fixing ring (3) and the second fixing ring (4) both include a fixing ring body (301) fixedly connected to the top of the bracket (1), a circular cavity (302) opened inside the fixing ring body (301), and slots (303) opened on both sides of the bottom of the fixing ring body (301). The first fixing ring (3) has a circular cover (304) fixedly connected to one side of the fixing ring body (301).
4. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 3, characterized in that, The rotating component (8) includes: A fixed shaft (801) is rotatably disposed inside the circular cover (304); A rotating gear (802) is fixedly connected to the outside of a fixed shaft (801); A rotating ring (803) is located outside the rotating gear (802), and a rotating tooth (804) is fixedly connected inside the rotating ring (803), and the rotating tooth (804) meshes with the rotating ring (803).
5. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 4, characterized in that, The locking component (9) includes: A rotating circular block (901) is fixedly connected to one side of a rotating gear (802); A locking block (902) is fixedly connected to one side of a rotating circular block (901), and the thickness of the locking block (902) gradually increases from one side to the other. A rubber pad (903) is fixedly connected to one side of the locking block (902).
6. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 5, characterized in that, The locking handle (10) includes: A sliding groove (1001) is provided on one side of the circular cover (304), and a locking groove (1002) is provided at one end of the sliding groove (1001), and the inner contour of the locking groove (1002) is elliptical. A threaded rod (1003) is fixedly connected to the outside of a rotating ring (803). A locking sleeve (1004) is threadedly connected to the outer surface of the threaded rod (1003), and the outer contour of the bottom of the locking sleeve (1004) is conical.
7. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 3, characterized in that, The rotating assembly (5) includes: A rotating ring (501) is rotatably disposed inside a circular cavity (302), and rotating teeth (502) are fixedly connected to the outer side of the rotating ring (501). The second annular piece (503) and the first annular piece (504) are fixedly connected to the inner side of the corresponding rotating ring (501), and the second annular piece (503) is located inside the second fixed ring (4), and the first annular piece (504) is located inside the first fixed ring (3). A connecting piece (505) is fixedly connected between the second annular piece (503) and the first annular piece (504).
8. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 7, characterized in that, The separation assembly (7) includes a separation screen (701), an outer ring (702) fixedly connected to the end of the separation screen (701), and a guide ring (703) fixedly connected to one side of one of the outer rings (702).
9. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 8, characterized in that, The positioning component (6) includes: Connecting block (601), the connecting block (601) is fixedly connected to the inner side of the rotating assembly (5); Positioning post (602), the positioning post (602) is fixedly connected to one side of the connecting block (601), and a positioning block (603) is fixedly connected to one side of the positioning post (602). The first positioning hole (604) is located on the outside of one of the outer rings (702), and a first through groove (605) is provided on one side of the first positioning hole (604). The second positioning hole (606) is located on the outside of another outer ring (702). A second through groove (607) is provided on one side of the second positioning hole (606), and the inner contour of the second positioning hole (606) is adapted to the outer contour of the positioning block (603).
10. The modular, three-type rapid switching method for a crabapple fruit separator according to claim 9, characterized in that, The inner contour of the second annular piece (503) is folded up, and the end face of the positioning block (603) is fixedly connected to the inner wall of the second annular piece (503). The outer contour of the positioning block (603) is conical.
