Disc type filter convenient to disassemble and assemble

Abstract

The utility model discloses a disc type filter convenient to disassemble and assemble, relates to the field of disc type filters, aims to solve the problem that whether a lock cover is installed in place or not is not easy to control in the prior art, and adopts the technical scheme that the disc type filter comprises an upper cover and a base, the base is connected with the upper cover and a filter element, a gland is arranged on the filter element, and the filter element is detachably connected with the lock cover; a buckle is arranged on the top face of the core cylinder, an anti-loosening mechanism is arranged on the lock cover, and the anti-loosening mechanism comprises an ejector rod, a sliding block and a pressing rod opposite to the ejector rod, and the ejector rod and the sliding block are connected in the lock cover in a sliding mode. By adopting buckle connection, the buckling operation of the lock cover can be simplified, the anti-loosening mechanism arranged on the upper cover can be used for detecting whether the lock cover is pressed in place or not, if the lock cover is not pressed in place, the sliding block abuts against the ejector rod so that the ejector rod can be located at the high position, the upper cover cannot be buckled with the base at the moment, and therefore maintenance personnel are forced to continue pressing the lock cover downwards till the buckle is buckled into the buckling position. According to the technical scheme, the filter element is more convenient to mount, whether the lock cover is mounted in place or not can be detected, and use is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of disc filters, in particular to a disc filter which is easy to assemble and disassemble. Background Art

[0002] The disc filter is a filter element formed by stacking filter discs with variable diameter flow channels. When the filtered fluid flows from the outer ring with a large aperture to the inner ring with a small aperture, the granular impurities in the fluid are blocked by the gradually smaller flow channels to achieve the filtering effect.

[0003] This filtering principle requires a high degree of compression of the filter discs. If the discs are not compressed, the gaps between the discs will increase, resulting in a decrease in filtering accuracy. Therefore, ensuring that the discs are compressed is an important means to ensure the filtering effect. The existing filter element is compressed by a locking cover of the filter disc through a threaded connection. However, due to the difference in strength of the screwing person, it is easy for a person with less strength to screw the locking cover into place, resulting in a decrease in filtering accuracy, or it is inconvenient to open the locking cover when maintaining the filter element, resulting in inconvenience in disassembly and assembly. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a disc filter which is easy to disassemble and assemble, thereby effectively solving the problems in the background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model discloses a disc-type filter that is easy to disassemble and assemble. The technical scheme adopted is that it includes an upper cover and a base. The upper cover is detachably connected to the base. A filter element is also installed on the base. The filter element also includes a bottom plate. A core barrel is provided on the bottom plate. A disc group is mounted on the core barrel. A pressure cover is provided on the top surface of the core barrel and a locking cover is detachably connected thereto. A buckle is provided on the top surface of the core barrel. A buckle position corresponding to the buckle position and matching in size is provided on the locking cover. The locking cover is locked by inserting the buckle into the buckle position. An anti-loosening mechanism is provided on the locking cover. The anti-loosening mechanism also includes a push rod and a sliding block. A sliding cavity is provided in the locking cover. The sliding block slides in the sliding cavity. The top surface of the sliding cavity is connected with the outside world through the detection hole, and the bottom surface is connected with the outside world. A push rod is slidably connected in the detection hole, and a first inclined surface and a second inclined surface are arranged on the sliding block, and the push rod is slidably connected with the first inclined surface; a pushing rod and a limiting rod are arranged on the pressure cover, and the pushing rod is slidably connected with the second inclined surface, and a third inclined surface is arranged on the limiting rod, and the sliding block is slidably connected with the third inclined surface; a pressing rod is arranged on the top surface of the upper cover, and the position of the pressing rod corresponds to that of the push rod; when the locking cover is not pressed down into place, not only will the buckle not be stuck in the buckle position, but the push rod is also in a high position, so that when the pressing rod is connected with the push rod, the upper cover cannot be fitted with the base, thereby avoiding the loose filter element from being installed on the base.

[0006] As a preferred technical solution of the utility model, a lock head is threadedly connected at the port above the detection hole, the lock head includes a head and a threaded section, the head and the threaded section are connected, the lock head is a tubular structure, the push rod is slidably connected in the lock head; the head is prismatic; a first spring is pressed between the lock head and the push rod. The first spring can ensure that the push rod and the first inclined surface are closely connected, and the setting of the lock head facilitates the assembly of the first spring and the push rod.

[0007] As a preferred technical solution of the utility model, the sliding block also includes a block body, the block body is prismatic, one end of the block body has the first inclined surface, the other end of the block body has an extension rod, the extension rod and the third inclined surface are slidably connected; the block body has a trapezoidal extrusion groove inside, the bottom surface of the extrusion groove is open, the inclined surface is the second inclined surface, the push rod enters the extrusion groove from below the extrusion groove and connects with the second inclined surface, and the sliding block is connected with a second spring. The push rod squeezes the second inclined surface of the extrusion groove to push the sliding block to slide, so that the push rod can move down along the first inclined surface.

[0008] As a preferred technical solution of the utility model, the end of the sliding cavity away from the push rod is connected to the outer side of the outer ring surface of the cover body of the lock cover, the connecting port is cylindrical, and is threadedly connected with a plug, and the plug has a slotted hole opened up and down, the slotted hole corresponds to the position of the limit rod, and the limit rod passes through the slotted hole. The setting of the plug facilitates the assembly of the sliding block and the second spring.

[0009] As a preferred technical solution of the utility model, the bottom surface of the sliding cavity is connected to the outside world through a first hole and a second hole, the first hole corresponds to the position of the extrusion groove, and the push rod is slidably connected in the first hole; the second hole corresponds to the position of the limit rod and matches the size, the limit rod is slidably connected in the second hole, and the second hole is connected to the sliding cavity.

[0010] As a preferred technical solution of the utility model, the bottom surface of the upper cover has a directional rod, the top surface of the base has a directional hole, and the directional rod corresponds to the directional hole. The arrangement of the directional rod and the directional hole can ensure that the pressure rod corresponds to the central tube position of the lock.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the utility model can simplify the buckling operation of the lock cover by adopting a snap-on connection. The pressure rod provided on the upper cover and the push rod and the sliding block provided on the lock cover can be used to detect whether the lock cover is pressed down into place. If the lock cover is not pressed down into place, the sliding block will hold the push rod to make it in a high position. At this time, when the upper cover is buckled, the push rod will hold the pressure rod so that the upper cover cannot be buckled with the base, thereby forcing the maintenance personnel to continue to press the lock cover down until the buckle is buckled into place. The directional rod on the upper cover and the directional hole on the base can facilitate the pressure rod to be opposite to the push rod. This technical solution makes the installation of the filter element more convenient, and can detect whether the lock cover is installed in place, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the filter element structure of the utility model;

[0014] Figure 3 This is a schematic diagram of the filter element lock cover of the utility model in an open state;

[0015] Figure 4 This is a schematic diagram of the lock cover structure of the utility model;

[0016] Figure 5 This is a schematic diagram of the internal structure of the lock cover of the utility model;

[0017] Figure 6 This is a schematic diagram of the cross-sectional structure of the anti-loosening mechanism inside the lock cover of the utility model;

[0018] Figure 7 This is a schematic diagram of the anti-loosening mechanism of the utility model after the lock cover is installed in place;

[0019] Figure 8 It is a cross-sectional schematic diagram of the anti-loosening mechanism of the utility model after the lock cover is installed in place;

[0020] Fig. 9 This is a schematic diagram of the structure of the sliding block of the utility model;

[0021] Fig.10 This is a schematic diagram of the cross-sectional structure of the sliding block of the utility model;

[0022] Fig.11 This is a schematic diagram of the limit rod structure of the utility model;

[0023] Fig.12 This is a schematic diagram of the cross-sectional structure of the limit rod of the utility model;

[0024] Fig.13 This is a schematic diagram of the plug structure of the utility model;

[0025] Fig.14 This is a schematic diagram of the cross-sectional structure of the plug of the utility model;

[0026] Fig.15 This is a schematic diagram of the cross-sectional structure of the lock of the utility model;

[0027] Fig.16 This is a schematic diagram of the position relationship between the pressure rod and the lock head when the lock cover of the utility model is installed in place;

[0028] Fig.17 This is an enlarged structural diagram of part A of the utility model;

[0029] Fig.18 This is a schematic diagram of the position relationship between the pressure rod, the lock head and the push rod when the lock cover of the utility model is not installed in place;

[0030] Fig.19 This is a schematic diagram of the directional rod and directional hole structure of the utility model;

[0031] Fig. 20 This is a schematic diagram of the structure of the unlocker of the utility model;

[0032] Fig.21 This is a schematic diagram of the cross-sectional structure of the unlocker of the utility model;

[0033] Fig. 22 This is a schematic diagram of the connection between the unlocker and the lock cover of the utility model.

[0034] In the figure: 1, upper cover; 101, pressure rod; 102, directional rod; 2, base; 201, directional hole; 3, filter element; 301, bottom plate; 302, disc group; 303, pressure cover; 3031, push rod; 3032, limit rod; 30321, perforation; 30322, third inclined surface; 304, lock cover; 3041, cover body; 3042, stepped hole; 3043, push rod; 3044, lock head; 3045, first spring; 3046, sliding block; 30461 , block; 30462, first inclined surface; 30463, extension rod; 30464, second inclined surface; 3047, second spring; 3048, plug; 30481, screw head; 30482, core; 30483, top plate; 30484, slot; 3049, first plug hole; 30410, second plug hole; 30411, detection hole; 305, buckle; 4, sealing ring; 5, unlocker; 501, latch; 502, third spring; 503, fourth inclined surface. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0036] like Figures 1 to 22 As shown, the utility model discloses a disc filter which is easy to assemble and disassemble. The technical scheme adopted is that it includes an upper cover 1 and a base 2, a filter element 3 is installed on the base 2, a sealing ring 4 is installed between the upper cover 1 and the base 2, and the upper cover 1 and the base 2 are locked by a clamp.

[0037] like Figure 2 , Figure 3 As shown, the filter element 3 includes a bottom plate 301, a core barrel is arranged above the bottom plate 301, a disc set 302 is mounted on the core barrel, a circular gland 303 is arranged above the disc set 302, and buckles 305 are arranged in a circular array on the top surface of the core barrel. A locking cover 304 is arranged above the gland 303, and a cover body 3041 of the locking cover 304 is a circular ring structure, as shown in FIG. Figure 4 , Figure 5 As shown, its inner ring surface is a stepped hole 3042, and the stepped hole 3042 is divided into two sections, the inner diameter of the lower section is larger than the inner diameter of the upper section, so that the buckle 305 can pass through the inner ring surface and buckle to the top surface, while the lower bottom surface of the locking cover 304 is completely connected with the pressure cover 303, thereby preventing the top surface of the core tube from forming support on the bottom surface of the locking cover 304 and affecting the tightening.

[0038] In order to prevent the staff from performing subsequent installation without completely fastening the lock cover 304, which may lead to a reduction in filtration accuracy, an anti-loosening mechanism is provided between the lock cover 304 and the pressure cover 303. Figures 3 to 8 As shown, the anti-loosening mechanism includes a push rod 3043 and a sliding block 3046. A sliding cavity is provided in the lock cover 304. The sliding block 3046 is slidably connected in the sliding cavity. In order to establish a correlation with the downward pressing distance of the lock cover 304, the top surface of the sliding cavity is connected to the upper outside world through the detection hole 30411, and the bottom surface is connected to the lower outside world through the first plug hole 3049 and the second plug hole 30410. A push rod 3031 and a limit rod 3032 are provided on the top surface of the pressure cover 303. The push rod 3031 is slidably connected in the first plug hole 3049, and the limit rod 3032 is slidably connected in the second plug hole 30410. The push rod 3043 is slidably connected in the detection hole 30411, as shown in FIG. Fig. 9 , Fig.10As shown, in order to make the sliding block 3046 slide when the locking cover 304 is pressed down, a first inclined surface 30462 is set on the top surface of one end of the block body 30461 of the sliding block 3046 close to the core tube, and an extrusion groove is set inside the block body 30461. The extrusion groove is a right-angled trapezoidal groove, and its inclined surface is the second inclined surface 30464. The lower part of the extrusion groove is open and corresponds to the first socket 3049. The lower end of the push rod 3043 corresponds to the position of the first inclined surface 30462, and the upper end of the push rod 3031 corresponds to the position of the second inclined surface 30464. When the lock cover 304 is pressed down, the second inclined surface 30464 squeezes the upper end of the push rod 3031, so that the sliding block 3046 slides away from the core barrel. As the sliding block 3046 slides, the push rod 3043 falls along the first inclined surface 30462. In order to ensure that the push rod 3043 is in close contact with the first inclined surface 30462, a first spring 3045 is installed above the push rod 3043. In order to prevent the sliding block 3046 from being forced to continue to move by applying force when the upper cover 1 is installed when the lock cover 304 is not installed in place, an extension rod 30463 is provided at the end of the block body 30461 of the sliding block 3046 away from the core barrel. Fig.11 , Fig.12 As shown, both sides of the limit rod 3032 are provided with transparent through holes 30321, and the top surface of the through hole 30321 is provided with a third inclined surface 30322. The extension rod 30463 is slidably connected with the third inclined surface 30322. As the lock cover 304 is pressed down, the extension rod 30463 can slide to the right farther and farther. In order to facilitate the reset of the sliding block 3046, the extension rod 30463 is sleeved with a second spring 3047, and the elastic coefficient of the second spring 3047 is greater than the elastic coefficient of the first spring 3045; in order to facilitate the reset of the top rod 3043, the lower end of the top rod 3043 is a spherical end.

[0039] In order to facilitate the assembly of the anti-loosening mechanism, the upper end of the detection hole 30411 is provided with an internal thread and is threadedly connected with a lock head 3044. Fig.15 As shown, the lock head 3044 includes a prism section and a threaded section, the prism section is on the top and the threaded section is on the bottom, the threaded section is engaged with the internal thread of the detection hole 30411, and there is a through tube with two ends opened inside the lock head 3044, the push rod 3043 is slidably connected in the through tube, and there is a baffle on the push rod 3043, and the first spring 3045 is located between the baffle and the lock head 3044.

[0040] The end of the sliding cavity away from the core barrel is connected to the outside, and the port has an internal thread and is threadedly connected with a plug 3048, such as Fig.13 , Fig.14As shown, the plug 3048 includes a screwing head 30481 and a core body 30482. The screwing head 30481 has an external thread that meshes with the internal thread at the port of the sliding cavity. One of the two end faces of the screwing head 30481 has an internal hexagonal countersunk hole, and the other is connected to the core body 30482. The core body 30482 has a slot 30484 for the limit rod 3032 to pass through. The end of the core body 30482 away from the screwing head 30481 is connected to a top plate 30483, and the top plate 30483 is an annular plate. The second spring 3047 is located between the block 30461 and the top plate 30483, and the extension rod 30463 passes through the inner ring of the top plate 30483.

[0041] like Figures 16 to 18 As shown, a pressure rod 101 is provided on the inner top surface of the upper cover 1, and the pressure rod 101 corresponds to the position of the tube through the lock head 3044 and the size matches. In order to facilitate installation, the pressure rod 101 is opposite to the tube through the lock head 3044, as shown in FIG. Fig.19 As shown, a directional rod 102 is provided on the bottom surface of the upper cover 1 , and a directional hole 201 is provided on the top surface of the base 2 , and the directional rod 102 is slidably connected in the directional hole 201 .

[0042] like Figure 20 to Figure 21 As shown, in order to facilitate the effect of rapid disassembly during maintenance, an unlocker 5 is also provided. The unlocker 5 is a shell structure, and its inner diameter is not less than the outer diameter of the lock cover 304. An unlocking ring is provided on the inner top surface of the unlocking ring. A fourth inclined surface 503 is provided on the inner ring surface of the unlocking ring. The fourth inclined surface 503 is opposite to the buckle 305, and the inner diameter of the lower edge of the fourth inclined surface 503 is not greater than the inner diameter of the lock cover 304. A pin hole is provided on the vertical side wall of the unlocker 5, and a latch 501 is slidably connected in the pin hole. The latch 501 corresponds to the countersunk hole position on the end surface of the screwing head 30481 of the plug 3048, and the latch 501 can be inserted into the countersunk hole. A third spring 502 is installed between the latch 501 and the pin hole. In order to facilitate pulling, a handle is provided on the end surface of the latch 501. In order to prevent interference of the latch 501, a fifth inclined surface is provided below one end of the latch 501 located inside the unlocker 5. The assembly structure of the latch 501 is the same as that of the ejector rod 3043 .

[0043] In order to prevent the sediment particles in the water to be filtered from entering the anti-loosening mechanism and affecting its operation, a gasket is provided between the locking cover 304 and the pressure cover 303 , and the gasket is located outside the second insertion hole 30410 .

[0044] The working principle of this utility model:

[0045] The disc pack 302 is mounted on the core barrel of the filter element 3, and the pressure cover 303 is pressed on the disc pack 302, and the gasket is installed, and the lock cover 304 is installed. During installation, the push rod 3031 is aligned with the first plug hole 3049, and the limit rod 3032 is aligned with the second plug hole 30410, and the lock cover 304 is pressed down, and the push rod 3031 enters the first plug hole 3049, and the limit rod 3032 enters the second plug hole 30410. The sliding block 3046 is pressed against the second plug hole 30410 by the push rod 3031. The inclined surface 30464 is squeezed and starts to slide toward the plug 3048, and at the same time, the second spring 3047 is compressed. As the plug 3048 slides, the top rod 3043 starts to descend under its own gravity and the action of the first spring 3045, and enters the detection hole 30411. At the same time, the extension rod 30463 enters the through hole 30321 of the limit rod 3032 and connects with the third inclined surface 30322, until the buckle 305 is buckled to the top surface of the lock cover 304, and the installation is completed. The filter element 3 is installed on the base 2.

[0046] Install the sealing ring 4, install the upper cover 1, align the directional rod 102 with the directional hole 201, and then place the upper cover 1 on the sealing ring 4. At this time, the pressure rod 101 is aligned with the through-tube of the lock head 3044. As the upper cover 1 falls, the pressure rod 101 enters the through-tube and is fixed with a clamp.

[0047] If the locking cover 304 is not installed in place, the push rod 3043 will not completely enter the detection hole 30411. When the upper cover 1 is installed, the push rod 3043 will support the pressure rod 101, preventing it from continuing to fall. Even if it is pressed down with force, the sliding block 3046 cannot move toward the plug 3048 because the third inclined surface 30322 of the limit rod 3032 blocks the extension rod 30463, so that the upper cover 1 cannot be smoothly fastened. At this time, the staff needs to adjust the locking cover 304 and press it down into place to complete the installation of the upper cover 1.

[0048] When the filter element 3 needs to be disassembled for cleaning and maintenance, the clamp is opened to remove the upper cover 1, and the unlocking device 5 is put on the lock cover 304 from above, and the unlocking device 5 is pressed down. The lock cover 304 squeezes the fifth inclined surface of the latch 501 to make it enter the pin hole, and at the same time compresses the third spring 502, and squeezes the buckle 305 through the fourth inclined surface 503 of the unlocking ring to release the buckle of the lock cover 304. After the unlocking ring is connected to the top surface of the lock cover 304, the unlocking device 5 is rotated, and the latch 501 and the plug 3048 are connected. When the countersunk holes are opposite to each other, the latch 501 pops out under the action of the third spring 502 and is inserted into the countersunk hole. The unlocker 5 is lifted up and the lock cover 304 is removed. As the lock cover 304 moves up, the sliding block 3046 is reset under the action of the second spring 3047. The second inclined surface 30464 is connected with the spherical end of the push rod 3043 and squeezes the spherical end to move the push rod 3043 up until the push rod 3043 is reset. The handle is pulled to pull the latch 501 out of the countersunk hole, and the unlocker 5 and the lock cover 304 are separated.

[0049] The mechanical connection involved in the utility model is a common means used by technical personnel in this field, and technical inspiration can be obtained through a limited number of tests, which belongs to common knowledge.

[0050] Components not described in detail herein are prior art.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A disc filter that is easy to assemble and disassemble, comprising an upper cover (1) and a base (2), wherein the upper cover (1) is detachably connected to the base (2), a filter element (3) is also mounted on the base (2), the filter element (3) further comprises a bottom plate (301), a core barrel is disposed on the bottom plate (301), a disc assembly (302) is mounted on the core barrel, a pressure cover (303) is disposed on the top surface of the core barrel, and a lock cover (304) is detachably connected thereto, wherein: The top surface of the core barrel is provided with a buckle (305), and the lock cover (304) is provided with a buckle position corresponding to the position of the buckle (305) and matching in size; the lock cover (304) is provided with an anti-loosening mechanism, and the anti-loosening mechanism also includes a push rod (3043) and a sliding block (3046); a sliding cavity is opened in the lock cover (304), and the sliding block (3046) is slidably connected in the sliding cavity; the top surface of the sliding cavity is connected to the outside world through a detection hole (30411), and the bottom surface is connected to the outside world; the push rod (3043) is slidably connected in the detection hole (30411), and the sliding block (3046) is provided with a first inclined The upper cover (1) has a first inclined surface (30462) and a second inclined surface (30464), and the push rod (3043) is slidably connected to the first inclined surface (30462); the pressure cover (303) has a push rod (3031) and a limit rod (3032), the push rod (3031) and the second inclined surface (30464) are slidably connected, the limit rod (3032) has a third inclined surface (30322), and the sliding block (3046) is slidably connected to the third inclined surface (30322); the inner top surface of the upper cover (1) has a pressure rod (101), and the pressure rod (101) corresponds to the position of the push rod (3043).

2. The disc filter that is easy to assemble and disassemble according to claim 1 is characterized in that: A locking head (3044) is threadedly connected at the port above the detection hole (30411), the locking head (3044) comprising a head and a threaded section, the head and the threaded section being connected, the locking head (3044) being a tubular structure, the push rod (3043) being slidably connected inside the locking head (3044); the head being prismatic; and a first spring (3045) being press-fitted between the locking head (3044) and the push rod (3043).

3. The disc filter that is easy to assemble and disassemble according to claim 1 is characterized in that: The sliding block (3046) further comprises a block body (30461), the block body (30461) is prism-shaped, has the first inclined surface (30462) at one end, and has an extension rod (30463) at the other end, the extension rod (30463) and the third inclined surface (30322) are slidably connected; a trapezoidal extrusion groove is provided inside the block body (30461), the bottom surface of the extrusion groove is open, and the inclined surface is the second inclined surface (30464), the push rod (3031) enters the extrusion groove from below the extrusion groove and connects with the second inclined surface (30464), and the sliding block (3046) is connected to a second spring (3047).

4. The disc filter that is easy to assemble and disassemble according to claim 3 is characterized in that: One end of the sliding cavity away from the push rod (3043) is connected to the outer side of the outer ring surface of the cover body (3041) of the lock cover (304), and the connecting port is cylindrical and is threadedly connected to a plug (3048). The plug (3048) has a slot (30484) opened up and down, and the slot (30484) corresponds to the position of the limit rod (3032), and the limit rod (3032) passes through the slot (30484).

5. The disc filter that is easy to assemble and disassemble according to claim 4 is characterized in that: The bottom surface of the sliding cavity is connected to the outside through a first plug hole (3049) and a second plug hole (30410); the first plug hole (3049) corresponds to the position of the extrusion groove, and the push rod (3031) is slidably connected in the first plug hole (3049); the second plug hole (30410) corresponds to the position of the limit rod (3032) and matches the size thereof; the limit rod (3032) is slidably connected in the second plug hole (30410), and the second plug hole (30410) is connected to the sliding cavity.

6. The disc filter that is easy to assemble and disassemble according to claim 1, characterized in that: The bottom surface of the upper cover (1) is provided with an orientation rod (102), the top surface of the base (2) is provided with an orientation hole (201), and the positions of the orientation rod (102) and the orientation hole (201) correspond to each other.

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