CN217714363U

CN217714363U - Photoelectric turntable shell

Info

Publication number: CN217714363U
Application number: CN202221457349.4U
Authority: CN
Inventors: 李乙庚
Original assignee: CHENGDU XIWU SECURITY SYSTEM ALLIANCE CO LTD
Current assignee: CHENGDU XIWU SECURITY SYSTEM ALLIANCE CO LTD
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-11-01
Anticipated expiration: 2032-06-10

Abstract

The application discloses photoelectric turntable shell belongs to the supervisory equipment field, and it is great to have solved among the prior art photoelectric turntable size, and each part is dismantled and is installed inconveniently, has caused a great deal of inconvenient problem in the transportation. In the technical scheme of the application, the plug connector is plugged in the plug groove; one end of the plug is closed, and the other end of the plug is communicated with the inside of the power arm; the screw column penetrates through and is in threaded connection with the side wall of the insertion groove and the side wall of the insertion joint; the end part of the screw rod column is in surface contact with the packing block. The technical scheme of the utility model, the components of a whole that can be convenient carry out the components of a whole that can function independently dismantlement, improve the convenience degree of maintenance and transportation.

Description

Photoelectric turntable shell

Technical Field

The utility model relates to a photoelectricity revolving stage casing belongs to the supervisory equipment field.

Background

With the progress and development of photoelectric detection technology and equipment, the application range of the photoelectric turntable is gradually expanded. The photoelectric turntable can be used for tracking the target when the target is found. Therefore, the photoelectric turntable has an increasingly large effect in the fields of national defense and civil use, and is also increasingly widely applied, such as border line monitoring, ship-borne monitoring, urban air defense, forest fire prevention and the like. The existing photoelectric rotary table is large in size, can be packaged and transported only integrally, is too large in packaging size and brings inconvenience to transportation, and the existing photoelectric rotary table is usually assembled by bolts, so that the bolts are easy to loosen and deform in the long-term use process, and the action precision of the photoelectric rotary table in the operation process is influenced.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, the utility model provides a photoelectric rotary table casing, the components of a whole that can function independently dismantles that carries on that can be convenient, improves the convenience degree of maintenance and transportation.

The utility model adopts the technical scheme that the photoelectric turntable shell comprises a longitudinal axis power base shell I, wherein a transverse axis power assembly shell II is arranged at the upper end of the longitudinal axis power base shell I, and a photoelectric cabin shell III is arranged on the transverse axis power assembly shell II; the photoelectric cabin shell III is rotatably arranged in a U-shaped opening of the transverse shaft power component shell II, and the U-shaped bottom end of the transverse shaft power component shell II is rotatably connected to the top end of the longitudinal shaft power base shell I; the cross shaft power assembly shell II comprises a shell rotating seat and power arm shells arranged on two sides of the shell rotating seat, the lower ends of the power arm shells are provided with inserting joints, two ends of the shell rotating seat are provided with inserting grooves, and the inserting joints are inserted in the inserting grooves; one end of the plug-in connector is closed, and the other end of the plug-in connector is communicated with the interior of the power arm shell; the screw column penetrates through and is in threaded connection with the side wall of the insertion groove and the side wall of the insertion joint; the end of the screw column is in surface contact with the packing block.

Preferably, the photoelectric turntable shell further comprises a connecting screw rod, the shell rotating seat is of a hollow structure, the two plug connectors are respectively provided with a first through hole matched with the connecting screw rod, and when the photoelectric turntable shell is assembled, the power arm shells are respectively assembled at two ends of the shell rotating seat; the two plug connectors are respectively plugged in the shell rotating seat, and the first through holes of the two plug connectors correspond to each other; the connecting screw rod is arranged in the shell rotating seat, and two ends of the connecting screw rod extend into the plug connector through the first through hole respectively; the plug-in connector is sleeved on the connecting screw rod, and two ends of the connecting screw rod are respectively limited and constrained on the side wall of the power arm shell.

Preferably, the side wall of the power arm shell of the photoelectric turntable is provided with a threaded sleeve, the threaded sleeve is opposite to the plug connector, and the threaded sleeve and the plug connector are respectively constructed on two sides of the power arm shell; the threaded sleeve is provided with an external thread, the blocking cover is provided with an internal thread matched with the external thread, and the blocking cover is connected to the threaded sleeve in a threaded manner; the inner wall of the blocking cover is provided with a slot matched with the connecting screw rod, and the end part of the connecting screw rod is inserted into the slot.

Preferably, the photoelectric turntable shell is internally provided with a rubber extrusion block, the rubber extrusion block is provided with a second through hole matched with the connecting screw rod, and the end size of the rubber extrusion block is larger than the diameter of the first through hole; the second through hole is arranged corresponding to the first through hole, and the rubber extrusion block is sleeved on the connecting screw rod through the second through hole.

Preferably, a filling block is arranged in the plug connector of the photoelectric turntable shell; the packing block is provided with a third through hole, the rubber extrusion block is assembled in the packing block, the first through hole, the second through hole and the third through hole are communicated with each other, and the connecting screw rod penetrates through the first through hole, the second through hole and the third through hole.

Preferably, at least two filling blocks are arranged in the plug connector of the photoelectric turntable shell, and each filling block is respectively arranged at a position in the plug connector, which is matched with the screw rod column; the rubber extrusion blocks are arranged among the filling blocks and tightly press the filling blocks, and the filling blocks tightly press the screw rod columns.

Preferably, the photoelectric turntable shell further comprises a screw pressure plate, the connecting screw is provided with an external thread, the screw pressure plate is provided with an internal thread matched with the external thread of the connecting screw, and the screw pressure plate is connected to the connecting screw through a thread; the screw pressing disc extrudes the rubber extrusion block and pushes the rubber extrusion block to extrude the inner wall of the filling block.

Preferably, in the photoelectric turntable shell, a limiting protrusion matched with the plug connector is arranged in the shell rotating seat, and the closed end of the plug connector can be contacted with the limiting protrusion.

Optimized, above-mentioned photoelectricity revolving stage casing, the one end of keeping away from the filling block on the screw rod post is provided with spacing protruding two, and the shape of the screw hole of being connected with the screw rod post on the lateral wall of inserting groove sets up with spacing protruding two cooperations.

The beneficial effect of this application lies in: the utility model provides a second cross axle power component casing of photoelectricity revolving stage casing adopts the form of rotating the split type connection of seat and two power arm shells by the casing to fix a position the installation through the cooperation of bayonet joint and inserting groove, guaranteed the joint strength of split type casing, can reduce the deformation of second cross axle power component casing, also can prevent not hard up. And the setting of split type structure makes two components of a whole that can function independently dismantles of cross axle power component casing to can unpack the photoelectricity storehouse of photoelectricity revolving stage apart from cross axle power component and pack the transportation when packing the transportation, can reduce the packing volume, convenient transportation.

Drawings

FIG. 1 is a schematic structural diagram of the present application;

FIG. 2 is a schematic diagram of an internal structure of an embodiment of the present application;

FIG. 3 is an internal structural view of a second embodiment of the present application;

FIG. 4 is an enlarged view of FIG. 3 at A;

fig. 5 is an internal structural view of a third embodiment of the present application;

FIG. 6 is an enlarged view of FIG. 5 at B;

fig. 7 is an enlarged view of fig. 2 at C.

Detailed Description

The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

The photoelectric turntable shell comprises a longitudinal shaft power base shell I (1), a transverse shaft power assembly shell II (2) is installed at the upper end of the longitudinal shaft power base shell I (1), and a photoelectric cabin shell III (3) is installed on the transverse shaft power assembly shell II (2).

The second cross shaft power assembly shell (2) is U-shaped, and the third photoelectric cabin shell (3) is rotatably arranged in a U-shaped opening of the second cross shaft power assembly shell (2). For example, the two sides of the third photovoltaic cabin shell (3) are rotatably connected with the inner walls of the two sides of the U-shaped opening of the second transverse shaft power assembly shell (2) through the second shaft (22), a power mechanism consisting of a motor and a reduction gear set is arranged in the second transverse shaft power assembly shell (2) to drive the second shaft (22) on the two sides of the third photovoltaic cabin shell (3) to rotate, the structure of the power mechanism can be realized by using the motor and the reduction gear set which are commonly used in photoelectric monitoring, and the specific structure is not repeated herein.

The U-shaped bottom end of the second transverse shaft power assembly shell (2) is rotatably connected to the top end of the first longitudinal shaft power base shell (1) through a rotating shaft. Be provided with the motor in the axis of ordinates power base casing (1), power unit drive cross axle power component casing two (2) and the axis of ordinates power base casing between (1) of reduction gear group constitution rotate, for example, the pivot is vertical to be set up, and can connect in axis of ordinates power base casing (1) through the bearing, the upper end of pivot is connected in cross axle power component casing two (2), the lower extreme passes through reduction gear group transmission and connects the motor, so that utilize the motor drive pivot to rotate, thereby can drive the rotation of cross axle power component casing two (2).

The cross shaft power assembly shell II (2) comprises a shell rotating seat (2-1) and power arm shells (2-2) arranged on two sides of the shell rotating seat (2-1), the lower ends of the power arm shells (2-2) are provided with inserting-connecting joints (2-3), two ends of the shell rotating seat (2-1) are provided with inserting-connecting grooves (2-4), and the inserting-connecting joints (2-3) are inserted into the inserting-connecting grooves (2-4); one end of the plug connector (2-3) is closed, and the other end of the plug connector is communicated with the interior of the power arm shell (2-2); the plug connector (2-3) is internally and fixedly provided with a filling block (2-5), the side surface of the plug groove (2-4) is provided with a screw rod column (4), the screw rod column (4) penetrates through the side wall of the plug groove (2-4) and the side wall of the plug connector (2-3) and is in threaded connection with the side wall of the plug groove (2-4) and the side wall of the plug connector (2-3), namely, the side wall of the plug groove (2-4) and the side wall of the plug connector (2-3) are respectively provided with a threaded hole which are mutually adaptive, and the screw rod column (4) is provided with an external thread which is adaptive to the threaded hole; the end part of the screw column (4) is in surface contact with the packing blocks (2-5).

The utility model provides a cross axle power component casing two (2) of photoelectricity revolving stage casing adopts and rotates the form of seat (2-1) and two power arm shells (2-2) split type connections by the casing to fix a position the installation through the cooperation of bayonet joint (2-3) and inserting groove (2-4), guaranteed the joint strength of split type casing, can reduce the deformation of cross axle power component casing two (2), also can solve current bolted connection and have the problem that becomes flexible inefficacy easily. And the setting of split type structure makes two (2) detachable dismantlements of cross axle power component casing to can unpack the photoelectricity storehouse of photoelectricity revolving stage apart from the cross axle power component and pack the transportation when packing the transportation, can reduce the packing volume, convenient transportation.

One end of the screw column (4) far away from the filling block (2-5) is provided with a second limiting protrusion (4-1), and the shape of a threaded hole in the side wall of the insertion groove (2-4) and connected with the screw column (4) is matched with the second limiting protrusion (4-1).

After the plug-in groove (2-4) and the plug-in connector (2-3) are fixed through the screw column (4), in order to reduce looseness of the screw column (4), the lower end of the screw column (4) is supported through the filling block (2-5), so that the screw column (4) cannot move towards the plug-in groove (2-4) and the plug-in connector (2-3), and the screw column (4) cannot move towards the outside of the plug-in groove (2-4) through the limiting protrusion II (4-1), looseness of the screw column (4) is reduced, and further connection firmness of the plug-in groove (2-4) and the plug-in connector (2-3) is improved.

In order to fix the power arm shell (2-2), in an embodiment, the power arm shell further comprises a connecting screw rod (5), the shell rotating seat (2-1) can be constructed to be a hollow structure, the two plug connectors (2-3) are respectively constructed with first through holes which are matched with the connecting screw rod (5), when the power arm shell (2-2) is assembled, the two plug connectors (2-3) are respectively assembled at two ends of the shell rotating seat (2-1), as shown in fig. 2, the two plug connectors (2-3) are respectively plugged into the shell rotating seat (2-1), and the two first through holes are right corresponding to each other. During assembly, the connecting screw rod (5) can be conveniently arranged in the shell rotating seat (2-1), and two ends of the connecting screw rod (5) can respectively extend into the plug-in connectors (2-3) through the first through holes, as shown in fig. 2, the plug-in connectors (2-3) can be sleeved on the connecting screw rod (5), two ends of the connecting screw rod (5) can be respectively limited and constrained on the side wall of the power arm shell (2-2), and the purpose of fixing the connecting screw rod (5) is achieved.

More specifically, the side wall of power arm shell (2-2) is provided with threaded sleeve (6), threaded sleeve (6) just to bayonet joint (2-3), and threaded sleeve (6) and bayonet joint (2-3) construct respectively in the both sides of power arm shell (2-2), as shown in fig. 2, threaded sleeve (6) constructs the external screw thread, and shutoff lid (7) constructs the internal thread of looks adaptation for shutoff lid (7) can threaded connection in threaded sleeve (6), realize dismantling the connection, be convenient for installation and dismantlement. In addition, the slot that adaptation connecting screw (5) were still constructed to shutoff lid (7) inner wall for connecting screw (5)'s tip can be pegged graft in the slot, and when the assembly, through the cooperation of shutoff lid (7) and threaded sleeve (6), can spacing restraint connecting screw (5) both ends, thereby reach the purpose of fixed connection screw (5), prevent connecting screw (5) lateral shifting, and can improve connecting screw (5) supporting role.

In a further embodiment, as shown in fig. 2, a rubber extrusion block (2-6) is further arranged in the plug connector (2-3), the rubber extrusion block (2-6) is configured with a second through hole which is matched with the connecting screw rod (5), and the end size of the rubber extrusion block (2-6) is larger than the diameter of the first through hole; when the rubber extrusion blocks (2-6) are assembled in the connecting plugs (2-3), the second through holes just correspond to the first through holes, so that the rubber extrusion blocks (2-6) can be sleeved on the connecting screw rods (5) through the second through holes.

Accordingly, in one embodiment, as shown in fig. 3 and 4, a packing block (2-5) may be provided in the socket (2-3), and at this time, the packing block (2-5) should be configured with a third through hole so that the packing block (2-5) can be fitted in the socket (2-3), and the rubber pressing block (2-6) can be fitted in the packing block (2-5) and communicate the first through hole, the second through hole, and the third through hole with each other so as to pass through the connecting screw (5).

In another embodiment, as shown in fig. 5 and 6, at least two filling blocks (2-5) may be disposed in the plug (2-3), each filling block (2-5) is disposed in the plug (2-3) at a position adapted to the screw column (4), and the rubber extrusion blocks (2-6) may be disposed between the filling blocks (2-5), so that the filling blocks (2-5) are compressed by the rubber extrusion blocks (2-6), and the screw column (4) is compressed by the filling blocks (2-5), thereby achieving the purpose of preventing loosening and falling off.

More perfect, still include screw rod pressure disk (5-1), connecting screw rod (5) are constructed external screw thread, and screw rod pressure disk (5-1) are constructed internal screw thread that the looks adaptation makes screw rod pressure disk (5-1) can be connected in connecting screw rod (5) through the screw thread, as shown in fig. 2, makes screw rod pressure disk (5-1) can extrude rubber extrusion piece (2-6) and promote rubber extrusion piece (2-6) extrusion filling block (2-5) inner wall.

Correspondingly, a limiting bulge (2-7) matched with the plug connector (2-3) is arranged in the shell rotating seat (2-1), the closed end of the plug connector (2-3) can be contacted with the limiting bulge (2-7), so that the plug connector (2-3) is limited to move towards the shell rotating seat (2-1) through the limiting bulge (2-7). The rubber extrusion block (2-6) is extruded through the screw pressing plate (5-1), so that the rubber extrusion block (2-6) pushes the filling block (2-5) to extrude the plug connector (2-3), the two plug connectors (2-3) are subjected to opposite extrusion forces, the plug connectors (2-3) can be contacted with the limiting bulges, the positions of the plug connectors (2-3) in the insertion grooves (2-4) are fixed, and the connection firmness is ensured.

When the device is installed, the blocking cover (7) is taken down, and the plug-in connectors (2-3) of the two power arm shells (2-2) are plugged into the plug-in grooves (2-4) at the two ends of the shell rotating seat (2-1). The screw column (4) is fixed and installed from the threaded sleeve (6) by using an elbow screw (such as Danis BS 579120). After the filling blocks (2-5) are installed, the rubber extrusion blocks (2-6) are installed in the filling blocks (2-5). The method comprises the steps of enabling a connecting screw rod (5) to penetrate through filling blocks (2-5) and rubber extrusion blocks (2-6) in two plug-in connectors (2-3), then installing a screw rod pressure plate (5-1) on the connecting screw rod (5), enabling the screw rod pressure plate (5-1) to extrude the rubber extrusion blocks (2-6), then installing a plugging cover (7) on a threaded sleeve (6), enabling the end portion of the connecting screw rod (5) to be plugged into a slot in the inner wall of the plugging cover (7) and enabling the end portion to be in contact with the bottom end face of the interior of the slot, and accordingly completing the installation process of a power arm shell (2-2) and a shell rotating seat (2-1).

As shown in fig. 2 and 7, a second shaft (22) with a spline is fixedly connected to each side of the third photovoltaic module housing (3), and the two second shafts (22) are coaxial. A driving gear (23) is arranged in one power arm shell (2-2), the driving gear (23) is installed on a hollow shaft (24), the driving gear (23) is meshed with a power output gear of a reduction gear set in the transverse shaft power assembly shell II (2), and a driving motor is in transmission connection with the reduction gear set so as to drive the driving gear (23) and the hollow shaft (24) to synchronously rotate; meanwhile, the hollow shaft (24) is mounted in the power arm shell (2-2) through a bearing, so that the hollow shaft (24) can rotate relative to the power arm shell (2-2), a spline groove matched with the spline is formed in the hollow shaft (24), and a hole is formed in the side wall of the power arm shell (2-2) and corresponds to the hollow shaft (24).

Similarly, a hollow shaft (24) is also arranged in the other power arm shell (2-2), the hollow shaft (24) can be arranged on the power arm shell (2-2) through a bearing, so that the hollow shaft (24) can rotate relative to the power arm shell (2-2), a spline groove matched with the spline is formed in the hollow shaft (24), and a hole corresponding to the hollow shaft (24) is also arranged on the side wall of the power arm shell (2-2). When the assembly is carried out, the second shafts (22) on the two sides of the third photoelectric cabin shell (3) are inserted into the hollow shaft (24) in the power arm shell (2-2) through the holes respectively, so that the rotatable installation of the third photoelectric cabin shell (3) can be realized, the transmission connection of the third photoelectric cabin shell (3) and the driving motor can be synchronously realized, the whole assembly process is simpler, more convenient and more efficient, and the assembly and disassembly are very convenient.

Because the action of each part needs higher action precision when the photoelectric rotary table is used for monitoring and tracking, the structure is used for connecting the power arm shell (2-2) and the shell rotating seat (2-1). If the power arm shell (2-2) and the shell rotating seat (2-1) are connected only by bolts, the connection part of the power arm shell and the shell rotating seat is connected by bolts with lower stress strength, and the bolts are easy to deform after long-term use, so that the shell II (2) of the transverse shaft power assembly of the photoelectric turntable deforms, and the action precision of the photoelectric cabin in operation is influenced.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also understand that the changes, modifications, additions and substitutions made within the scope of the present invention should all belong to the protection scope of the present invention.

Claims

1. A photoelectric turntable shell comprises a longitudinal shaft power base shell I (1), a transverse shaft power assembly shell II (2) is installed at the upper end of the longitudinal shaft power base shell I (1), and a photoelectric cabin shell III (3) is installed on the transverse shaft power assembly shell II (2); the second cross shaft power assembly shell (2) is U-shaped, the third photoelectric cabin shell (3) is rotatably arranged in a U-shaped opening of the second cross shaft power assembly shell (2), and the U-shaped bottom end of the second cross shaft power assembly shell (2) is rotatably connected to the top end of the first longitudinal shaft power base shell (1); the method is characterized in that: the transverse shaft power assembly shell II (2) comprises a shell rotating seat (2-1) and power arm shells (2-2) arranged on two sides of the shell rotating seat (2-1), the lower ends of the power arm shells (2-2) are provided with plug-in connectors (2-3), two ends of the shell rotating seat (2-1) are provided with plug-in grooves (2-4), and the plug-in connectors (2-3) are plugged in the plug-in grooves (2-4); one end of the plug connector (2-3) is closed, and the other end of the plug connector is communicated with the interior of the power arm shell (2-2); the filling block (2-5) is fixedly arranged in the plug connector (2-3), the side surface of the plug groove (2-4) is provided with a screw rod column (4), and the screw rod column (4) penetrates through the side wall of the plug groove (2-4) and the side wall of the plug connector (2-3) and is in threaded connection with the side wall of the plug groove (2-4) and the side wall of the plug connector (2-3); the end part of the screw column (4) is in surface contact with the packing blocks (2-5).

2. The optoelectronic turret housing of claim 1, wherein: the power arm assembly is characterized by further comprising a connecting screw rod (5), the shell rotating seat (2-1) is of a hollow structure, the two plug connectors (2-3) are respectively provided with a first through hole adaptive to the connecting screw rod (5), and during assembly, the power arm shells (2-2) are respectively assembled at two ends of the shell rotating seat (2-1); the two plug connectors (2-3) are respectively plugged in the shell rotating seat (2-1), and the first through holes of the two plug connectors (2-3) are mutually corresponding; the connecting screw rod (5) is arranged in the shell rotating seat (2-1), and two ends of the connecting screw rod (5) respectively extend into the plug-in connectors (2-3) through the first through holes; the plug-in connector (2-3) is sleeved on the connecting screw rod (5), and two ends of the connecting screw rod (5) are respectively limited and constrained on the side wall of the power arm shell (2-2).

3. The optoelectronic turret housing of claim 2, wherein: the side wall of the power arm shell (2-2) is provided with a threaded sleeve (6), the threaded sleeve (6) is opposite to the plug-in connector (2-3), and the threaded sleeve (6) and the plug-in connector (2-3) are respectively constructed on two sides of the power arm shell (2-2); the threaded sleeve (6) is provided with external threads, the blocking cover (7) is provided with matched internal threads, and the blocking cover (7) is connected to the threaded sleeve (6) in a threaded manner; the inner wall of the blocking cover (7) is provided with a slot which is matched with the connecting screw rod (5), and the end part of the connecting screw rod (5) is inserted in the slot.

4. The optoelectronic turret housing of claim 2, wherein: a rubber extrusion block (2-6) is further arranged in the plug connector (2-3), a second through hole which is matched with the connecting screw rod (5) is formed in the rubber extrusion block (2-6), and the end size of the rubber extrusion block (2-6) is larger than the diameter of the first through hole; the second through hole is arranged corresponding to the first through hole, and the rubber extrusion blocks (2-6) are sleeved on the connecting screw rod (5) through the second through hole.

5. The optoelectronic turret housing of claim 4, wherein: a filling block (2-5) is arranged in the plug connector (2-3); the filling block (2-5) is provided with a third through hole, the rubber extrusion block (2-6) is assembled in the filling block (2-5), the first through hole, the second through hole and the third through hole are communicated with each other, and the connecting screw rod (5) penetrates through the first through hole, the second through hole and the third through hole.

6. The optoelectronic turret housing of claim 4, wherein: at least two filling blocks (2-5) are arranged in the plug connector (2-3), and each filling block (2-5) is respectively arranged at the position, matched with the screw column (4), in the plug connector (2-3); the rubber extrusion blocks (2-6) are arranged among the filling blocks (2-5), the rubber extrusion blocks (2-6) compress the filling blocks (2-5), and the filling blocks (2-5) compress the screw column (4).

7. An optoelectronic turret housing according to claim 3, 4 or 5, wherein: the screw press plate (5-1) is also included, the connecting screw (5) is provided with an external thread, the screw press plate (5-1) is provided with an internal thread matched with the external thread of the connecting screw (5), and the screw press plate (5-1) is connected to the connecting screw (5) through a thread; the screw pressing plate (5-1) extrudes the rubber extrusion block (2-6) and pushes the rubber extrusion block (2-6) to extrude the inner wall of the filling block (2-5).

8. The optoelectronic turret housing of claim 2, wherein: a limiting bulge (2-7) matched with the plug connector (2-3) is arranged in the shell rotating seat (2-1), and the closed end of the plug connector (2-3) can be contacted with the limiting bulge (2-7).

9. The optoelectronic turret housing of claim 2, wherein: and one end of the screw column (4) far away from the filling block (2-5) is provided with a second limiting protrusion (4-1), and the shape of a threaded hole connected with the screw column (4) in the side wall of the insertion groove (2-4) is matched with the second limiting protrusion (4-1).