Instruments that are easy to manufacture and assemble

Abstract

The present invention relates to the technical field of instruments, and discloses an instrument that is easy to manufacture and assemble, including an instrument housing, a circuit board and a data cable arranged in the instrument housing; the data cable and the instrument housing are plug-in connected, a sealing ring is convexly provided on the inner wall of the annular step groove, and a sealing groove matching the sealing ring is provided on the side of the annular plug head; a display is provided on the instrument housing, and the instrument housing has a mounting end face arranged opposite to the display, the mounting end face is recessed inward to form a wire harness cavity, and transition wire grooves connected to the wire harness cavity are respectively provided on both sides of the external opening of the wire harness cavity, an arc-shaped wire clip is provided on the mounting end face, and a dust cover for sealing the wire harness cavity is provided on the instrument housing; through modular plug-in connection, sealing and shock resistance, cable management and quick installation structure, the assembly efficiency, environmental adaptability and maintenance convenience of the instrument are significantly improved, and it is particularly suitable for complex working conditions such as vehicle-mounted and industrial, and has the characteristics of high reliability and long life.

Description

Technical Field

[0001] The present invention relates to the technical field of instruments, and in particular to an instrument that is easy to manufacture and assemble. Background Art

[0002] With the continuous development of society and the continuous advancement of science and technology, electric bicycles have become one of the most commonly used means of transportation in people's daily travel. Electric bicycles are an improved means of transportation based on ordinary bicycles, equipped with motors, batteries, control systems, instruments and operating components. Among them, the instrument of the electric bicycle is an instrument used to display various data. The instrument is electrically connected to the controller and the button head through a data cable. In this way, the controller can be controlled by operating the buttons on the button head, and the parameters of the controller and other parameters can be displayed on the instrument. It is one of the indispensable accessories of electric bicycles.

[0003] Most existing electric bicycle instruments are of an integrated structure, and the data cable is directly connected to the circuit board in the instrument by welding. As a result, when manufacturing and assembling the instrument, it is necessary to wait for the data cable to be matched, and the data cable must be welded to the circuit board in the instrument before the instrument assembly can be completed. In addition, it is inconvenient to connect to the handlebars or frame, and it is not convenient to install the device, which greatly reduces the manufacturing and assembly efficiency of the instrument. Summary of the Invention

[0004] The object of the present invention is to provide an instrument that is easy to manufacture and assemble, aiming to solve the problem of low manufacturing and assembling efficiency of instruments in the prior art.

[0005] The present invention is realized by providing an instrument that is easy to manufacture and assemble, comprising an instrument housing, a circuit board disposed within the instrument housing, and a data cable; the data cable and the instrument housing are connected in a pluggable manner, a plug cavity being defined in a side wall of the instrument housing, a conductive spring being disposed at the bottom of the plug cavity and electrically connected to the circuit board; one end of the data cable is electrically connected to a controller or a keypad, and the other end of the data cable has a terminal, the terminal being provided with a plug, and the plug being embedded with a conductive contact; when the data cable is inserted into the plug cavity through the plug, the conductive contact is electrically connected to the conductive spring, thereby achieving electrical connection between the data cable and the circuit board;

[0006] The upper portion of the plug cavity is expanded outward to form an annular step groove, and the upper portion of the plug is protruded outward to form an annular plug head matching the shape of the annular step groove;

[0007] When the data cable is inserted into the plug cavity through the plug, the bottom of the annular plug head abuts against the bottom of the annular step groove, and the outer periphery of the annular plug head abuts against the inner side wall of the annular step groove;

[0008] A sealing ring is protruded on the inner side wall of the annular step groove and is arranged circumferentially along the inner wall of the annular step groove. A sealing groove that cooperates with the sealing ring is opened on the side of the annular plug head; when the annular plug head is fully inserted into the annular step groove, the sealing ring and the sealing groove form a circumferential compression seal;

[0009] The instrument housing is provided with a display, the display is electrically connected to the circuit board, the instrument housing has a mounting end surface arranged opposite to the display, and the external opening of the plug cavity is located on the mounting end surface;

[0010] The mounting end surface is recessed inward to form a wire harness cavity, and transition wire grooves connected to the wire harness cavity are respectively provided on both sides of the external opening of the wire harness cavity. An arc-shaped wire clamp is provided on the mounting end surface, one end of the wire clamp is hingedly connected to the mounting end surface, and the other end of the wire clamp is snap-fitted to the mounting end surface, and the wire clamp is installed on both sides of the transition wire groove; a dust cover for sealing the wire harness cavity is provided on the instrument housing, and the dust cover is hingedly connected to the instrument housing.

[0011] Furthermore, an anti-vibration buffer layer is provided on the inner side wall of the plug-in cavity, and the anti-vibration buffer layer is made of silicone material.

[0012] Furthermore, external screw holes are respectively provided on both sides of the end head, and a mounting platform is protruding from the instrument housing. The mounting platform is circumferentially arranged along the external opening of the plug-in cavity. Two internal screw holes are provided on the mounting platform, and the two internal screw holes are respectively located on both sides of the plug-in cavity. The end head is connected to the mounting platform by screws passing through the external screw holes and the internal screw holes.

[0013] Furthermore, a limiting protrusion is provided on the mounting platform. When the end head is mounted on the mounting platform, one side of the end head abuts against the limiting protrusion.

[0014] Furthermore, the instrument housing is provided with a horizontal fastener for connecting to the vehicle rod, and one end of the horizontal fastener is rotatably connected to the limiting protrusion.

[0015] Furthermore, the horizontal fastener includes a connecting strip and a fastening strip that is enclosed with the connecting strip to form a fastening cavity. One end of the fastening strip is hingedly connected to one end of the connecting strip, and the other end of the fastening strip is connected to the connecting strip by a screw, and the other end of the connecting strip is rotatably connected to the limiting protrusion.

[0016] Furthermore, when two limiting protrusions are protruding from the mounting platform, the two limiting protrusions are relatively spaced apart to form a limiting area, the limiting area is located above the plug-in cavity, the two are connected to each other, and horizontal fasteners are respectively connected to the two limiting protrusions.

[0017] Furthermore, a locking piece is protruded on both sides of the mounting platform, the locking piece is located in the limiting area, and one side of the locking piece is docked on the limiting protrusion; the bottom of the end is concave inward to form a locking groove that matches the shape of the locking piece.

[0018] Furthermore, a fixing rod is convexly provided in the wire harness cavity, the fixing rod is vertically fixed in the wire harness cavity, a rotating shaft is connected to the fixing rod, the bottom of the rotating shaft is rotatably connected to the fixing rod, the rotating shaft is coaxially arranged with the wire hanging rod, a volute spring is provided on the rotating shaft, a wire take-up drum is sleeved on the rotating shaft, and limit disks are respectively provided at the upper and lower ends of the wire take-up drum, and the two limit disks are relatively spaced to form a winding area;

[0019] The outer end of the spiral spring spirally extends along the length direction of the fixed rod and is connected to the bottom of the spiral spring. The inner end of the spiral spring is connected to the rotating shaft.

[0020] Furthermore, a wire pulley is provided at the entrance of the wiring cavity, and a non-slip rubber layer is provided on the surface of the wire pulley. The wire pulley is arranged opposite to the transition wire groove, and the wheel rim of the wire pulley is a V-shaped groove structure. The dust cover is provided with a nesting seat docked with the rotating shaft, and a bearing is provided on the top of the rotating shaft, and the bearing is plugged and nested with the nesting seat.

[0021] Compared with the existing technology, the instrument provided by the present invention is easy to manufacture and assemble. Through modular plug-in connections, sealed and shock-resistant, cable management and quick installation structure, it significantly improves the assembly efficiency, environmental adaptability and maintenance convenience of the instrument. It is particularly suitable for complex working conditions such as vehicle-mounted and industrial, and has the characteristics of high reliability and long life, solving the problem of low manufacturing and assembly efficiency of the instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front perspective schematic diagram of an instrument provided by the present invention that is easy to manufacture and assemble;

[0023] Figure 2 It is a rear perspective schematic diagram of an instrument provided by the present invention that is easy to manufacture and assemble;

[0024] Figure 3 This is a rear-view exploded perspective diagram of an instrument provided by the present invention that is easy to manufacture and assemble;

[0025] Figure 4 This is a front view structural diagram of a data cable provided by the present invention;

[0026] Figure 5 It is a schematic diagram of the cross-section structure of the instrument provided by the present invention that is easy to manufacture and assemble;

[0027] Figure 6It is a three-dimensional schematic diagram of the instrument housing provided by the present invention;

[0028] Figure 7 It is an exploded perspective schematic diagram of the instrument housing provided by the present invention;

[0029] Figure 8 It is a schematic diagram of the cross-section structure of the beam line cavity and the rotating shaft provided by the present invention;

[0030] Figure 9 This invention Figure 8 Schematic diagram of the enlarged structure of A in the figure.

[0031] In the figure: instrument housing 10, data cable 20, mounting platform 30, limiting protrusion 40, horizontal fastener 50, display 60, plug-in cavity 11, annular step groove 12, sealing ring 13, mounting end face 14, wire clip 15, wire bundle cavity 16, transition wire groove 17, dust cover 18, nesting seat 19, fixing rod 161, rotating shaft 162, scroll spring 163, wire take-up reel 164, limiting disk 165, bearing 166, end 21, plug 22, annular plug-in head 23, sealing groove 24, outer screw hole 25, positioning groove 211, inner screw hole 31, positioning piece 32, connecting strip 51, buckling strip 52, buckling cavity 53. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0034] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] Reference Figure 1-9 The figure shows a preferred embodiment of the present invention.

[0036] An instrument that is easy to manufacture and assemble includes an instrument housing 10, a circuit board disposed within the instrument housing 10, and a data cable 20. The data cable 20 is connected to the instrument housing 10 in a pluggable manner. A plug cavity 11 is defined in a side wall of the instrument housing 10, and a conductive spring is disposed at the bottom of the plug cavity 11, which is electrically connected to the circuit board. One end of the data cable 20 is electrically connected to a controller or a keypad, and the other end of the data cable 20 has a terminal 21, which is provided with a plug 22, and the plug 22 is embedded with a conductive contact. When the data cable 20 is inserted into the plug cavity 11 through the plug 22, the conductive contact is electrically connected to the conductive spring, thereby achieving electrical connection between the data cable 20 and the circuit board.

[0037] The upper portion of the plug cavity 11 is expanded outward to form an annular step groove 12, and the upper portion of the plug 22 is protruded outward to form an annular plug head 23 that matches the shape of the annular step groove 12;

[0038] When the data cable 20 is inserted into the plug cavity 11 through the plug 22, the bottom of the annular plug head 23 abuts against the bottom of the annular step groove 12, and the outer periphery of the annular plug head 23 abuts against the inner side wall of the annular step groove 12;

[0039] A sealing ring 13 is protruded from the inner side wall of the annular step groove 12 and is arranged circumferentially along the inner wall of the annular step groove 12. A sealing groove 24 is formed on the side of the annular plug head 23 to cooperate with the sealing ring 13. When the annular plug head 23 is fully inserted into the annular step groove 12, the sealing ring 13 and the sealing groove 24 form a circumferential compression seal.

[0040] The instrument housing 10 is provided with a display 60, which is electrically connected to the circuit board. The instrument housing 10 has a mounting end surface 14 arranged opposite to the display 60, and the external opening of the plug cavity 11 is located on the mounting end surface 14;

[0041] A wire harness cavity 16 is formed on the mounting end surface 14 inwardly recessed, and transition wire grooves 17 connected to the wire harness cavity 16 are respectively provided on both sides of the external opening of the wire harness cavity 16. An arc-shaped wire clip 15 is provided on the mounting end surface 14, and one end of the wire clip 15 is hingedly connected to the mounting end surface 14, and the other end of the wire clip 15 is snap-fitted and connected to the mounting end surface 14. The wire clips 15 are installed on both sides of the transition wire groove 17; a dust cover 18 for covering the wire harness cavity 16 is provided on the instrument housing 10, and the dust cover 18 is hingedly connected to the instrument housing 10.

[0042] The above-mentioned instrument, which is easy to manufacture and assemble, significantly improves the assembly efficiency, environmental adaptability and maintenance convenience of the instrument through modular plug-in connections, sealed and shock-resistant, cable management and quick installation structure. It is particularly suitable for complex working conditions such as automotive and industrial use. It has high reliability and long life, and solves the problem of low manufacturing and assembly efficiency of the instrument.

[0043] The specific structural technical advantages of the instrument provided above are as follows:

[0044] 1). The plug-in design of the data cable 20 and the plug-in cavity 11 simplifies the connection steps between the circuit board and the external device, eliminating the need for soldering or complex wiring, significantly reducing assembly difficulty;

[0045] 2) Reliable electrical connection: The elastic contact between the conductive spring and the contact ensures the stability of the electrical connection and avoids signal interruption caused by looseness;

[0046] 3) Double sealing: The nested structure of the annular step groove 12 and the plug head provides the first layer of mechanical sealing; the circumferential compression of the sealing ring 13 and the sealing groove 24 forms a second layer of waterproof and dustproof barrier, suitable for outdoor or humid environments;

[0047] 4) Optimized cable management: The cable cavity 16 centrally stores redundant data cables 20, the transition trough 17 guides the cable routing, and the cable clamp 15 uses a hinged and snap-fit ​​design to quickly secure the cables and prevent entanglement.

[0048] 5) Dust protection: The dust cover 18 covers the opening of the cable cavity 16 to prevent dust from entering the interior. The hinged design facilitates opening and closing for maintenance.

[0049] 6) Optimized human-computer interaction: The alignment of the display 60 and the mounting end surface 14 facilitates user observation of data. The opening of the plug cavity 11 is located on the mounting end surface 14, ensuring that the plugging and unplugging operations are ergonomic.

[0050] In this embodiment, an anti-vibration buffer layer is provided on the inner side wall of the plug-in cavity 11 , and the anti-vibration buffer layer is made of silicone material.

[0051] The silica gel anti-vibration buffer layer on the inner wall of the plug cavity 11 can absorb external vibration or impact energy, preventing the contact point between the conductive spring and the plug 22 from loosening or poor contact due to vibration, thereby improving the connection stability.

[0052] In this embodiment, external screw holes 25 are respectively provided on both sides of the end cap 21, and a mounting platform 30 is protruding from the instrument housing 10. The mounting platform 30 is circumferentially arranged along the outer opening of the plug-in cavity 11. Two internal screw holes 31 are provided on the mounting platform 30. The two internal screw holes 31 are respectively located on both sides of the plug-in cavity 11. Screws are passed through the external screw holes 25 and the internal screw holes 31 to connect the end cap 21 to the mounting platform 30.

[0053] The end 21 of the data cable 20 is locked to the mounting platform 30 by screwing the outer screw hole 25 and the inner screw hole 31, thereby enhancing the mechanical connection strength between the plug 22 and the plug-in cavity 11 and preventing detachment caused by external force pulling; the mounting platform 30 is designed to surround the plug-in cavity 11 to provide uniform force support and avoid deformation of the shell when the screws are tightened.

[0054] In this embodiment, a limiting protrusion 40 is protruded from the mounting platform 30 . When the end head 21 is mounted on the mounting platform 30 , one side of the end head 21 abuts against the limiting protrusion 40 .

[0055] The limiting protrusion 40 forms a physical limit on one side of the terminal 21 to ensure that the angle and position of the plug 22 when inserted into the plug cavity 11 are accurate, thereby preventing poor contact or structural damage caused by misalignment.

[0056] In this embodiment, a horizontal fastener 50 for connecting to the vehicle handle is provided on the instrument housing 10 , and one end of the horizontal fastener 50 is rotatably connected to the limiting protrusion 40 .

[0057] The rotational connection design of the horizontal fastener 50 and the limiting protrusion 40 allows the instrument housing 10 to flexibly adjust the installation angle with the vehicle handle, adapting to the fixing requirements of different scenarios and expanding the scope of application.

[0058] In this embodiment, the horizontal fastener 50 includes a connecting strip 51 and a fastening strip 52 that is enclosed with the connecting strip 51 to form a fastening cavity 53. One end of the fastening strip 52 is hingedly connected to one end of the connecting strip 51, and the other end of the fastening strip 52 is connected to the connecting strip 51 by a screw. The other end of the connecting strip 51 is rotatably connected to the limiting protrusion 40.

[0059] The fastening cavity 53 is quickly opened and closed by the hinged fastening strip 52, which facilitates the installation and removal of the bicycle bar; the screw connection ensures the firmness after fastening and prevents the bicycle bar from loosening in a bumpy environment.

[0060] In this embodiment, when two limiting protrusions 40 are protruding from the mounting platform 30, the two limiting protrusions 40 are relatively spaced apart to form a limiting area. The limiting area is located above the plug-in cavity 11 and the two are connected to each other. Horizontal fasteners 50 are respectively connected to the two limiting protrusions 40.

[0061] The double limit bumps 40 and double fastener design enhance the connection strength between the instrument and the external structure, making it suitable for high-vibration environments; the limit area reserves routing space for the data cable 20 to avoid internal breakage caused by excessive bending of the cable, and ensures that the terminal 21 is centered when plugged in.

[0062] Two horizontal fasteners 50 are symmetrically mounted on both sides of the meter housing 10 .

[0063] In this embodiment, a locking piece 32 is protruded on both sides of the mounting platform 30. The locking piece 32 is located in the limiting area, and one side of the locking piece 32 is docked on the limiting protrusion 40; the bottom of the end head 21 is concave inward to form a locking groove 211 that matches the shape of the locking piece 32.

[0064] The engagement design of the locking piece 32 and the locking groove 211 enhances the mechanical locking force between the terminal 21 and the mounting platform 30 , preventing the terminal 21 from accidentally falling off when the screw is loosened, thereby improving the redundant security of the connection.

[0065] In this embodiment, a fixing rod 161 is convexly provided in the wire harness cavity 16, and the fixing rod 161 is vertically fixed in the wire harness cavity 16. A rotating shaft 162 is connected to the fixing rod 161, and the bottom of the rotating shaft 162 is rotatably connected to the fixing rod 161. The rotating shaft 162 is coaxially arranged with the wire hanging rod, and a volute spring 163 is provided on the rotating shaft 162. A wire take-up drum 164 is sleeved on the rotating shaft 162. The upper and lower ends of the wire take-up drum 164 are respectively provided with limit plates 165, and the two limit plates 165 are relatively spaced apart to form a winding area.

[0066] The outer end of the spiral spring 163 spirally extends along the length direction of the fixing rod 161 and is connected to the bottom of the spiral spring 163 . The inner end of the spiral spring 163 is connected to the rotating shaft 162 .

[0067] The spiral spring 163 drives the rotating shaft 162 to automatically retract excess cables, reducing wire entanglement; the limit plate 165 prevents the cables from escaping the winding area, keeping the wire harness neat;

[0068] The rotating shaft 162 structure enables the take-up drum 164 to rotate freely, adapting to the storage requirements of data cables 20 of different lengths and saving the internal space of the cable bundling cavity 16.

[0069] In this embodiment, a wire pulley is provided at the entrance of the wiring cavity 16, and a non-slip rubber layer is provided on the surface of the wire pulley. The wire pulley is arranged opposite to the transition wire groove 17, and the wheel rim of the wire pulley has a V-shaped groove structure. A nesting seat 19 that docks with the rotating shaft 162 is provided on the dust cover 18, and a bearing 166 is provided on the top of the rotating shaft 162. The bearing 166 is plugged and nested with the nesting seat 19.

[0070] Wire pulley and anti-slip rubber layer: The V-grooved wire pulley guides the data cable 20 smoothly into the cable cavity 16, and the anti-slip layer reduces wire wear; the nesting seat 19 cooperates with the bearing 166 to ensure smooth rotation of the rotating shaft 162, reducing the resistance of winding.

[0071] Integrated function of the dust cover 18: through the docking of the nesting seat 19 and the rotating shaft 162, the dust cover 18 also assumes the protection function of the take-up mechanism, simplifying the structural design.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An instrument that is easy to manufacture and assemble, characterized in that: The instrument comprises an instrument housing, a circuit board disposed within the instrument housing, and a data cable; the data cable is pluggably connected to the instrument housing, a plug-in cavity is defined in a side wall of the instrument housing, and a conductive spring is disposed at the bottom of the plug-in cavity, which is electrically connected to the circuit board; one end of the data cable is electrically connected to a controller or a keypad, and the other end of the data cable has a terminal, the terminal being provided with a plug, and the plug being embedded with a conductive contact; when the data cable is inserted into the plug-in cavity through the plug, the conductive contact is electrically connected to the conductive spring, thereby achieving electrical connection between the data cable and the circuit board; The upper portion of the plug cavity is expanded outward to form an annular step groove, and the upper portion of the plug is protruded outward to form an annular plug head matching the shape of the annular step groove; When the data cable is inserted into the plug cavity through the plug, the bottom of the annular plug head abuts against the bottom of the annular step groove, and the outer periphery of the annular plug head abuts against the inner side wall of the annular step groove; A sealing ring is protruded on the inner side wall of the annular step groove and is arranged circumferentially along the inner wall of the annular step groove. A sealing groove that cooperates with the sealing ring is opened on the side of the annular plug head; when the annular plug head is fully inserted into the annular step groove, the sealing ring and the sealing groove form a circumferential compression seal; The instrument housing is provided with a display, the display is electrically connected to the circuit board, the instrument housing has a mounting end surface arranged opposite to the display, and the external opening of the plug cavity is located on the mounting end surface; The mounting end surface is recessed inward to form a wire harness cavity, and transition wire grooves communicating with the wire harness cavity are respectively provided on both sides of the external opening of the wire harness cavity. An arc-shaped wire clamp is provided on the mounting end surface, one end of the wire clamp is hingedly connected to the mounting end surface, and the other end of the wire clamp is snap-fitted to the mounting end surface, and the wire clamp is installed on both sides of the transition wire groove; a dust cover for covering the wire harness cavity is provided on the instrument housing, and the dust cover is hingedly connected to the instrument housing; External screw holes are respectively provided on both sides of the terminal, and a mounting platform is protruded on the instrument housing. The mounting platform is arranged circumferentially along the outer opening of the plug-in cavity. Two internal screw holes are provided on the mounting platform. The two internal screw holes are respectively located on both sides of the plug-in cavity. Screws are passed through the external screw holes and the internal screw holes to connect the terminal to the mounting platform. A fixing rod is convexly provided in the wire harness cavity, and the fixing rod is vertically fixed in the wire harness cavity. A rotating shaft is connected to the fixing rod, and the bottom of the rotating shaft is rotatably connected to the fixing rod. The rotating shaft is coaxially arranged with the wire hanging rod, and a volute spring is provided on the rotating shaft. A wire take-up drum is sleeved on the rotating shaft, and a limit disk is provided at the upper and lower ends of the wire take-up drum respectively, and a relative spacing between the two limit disks forms a winding area; The outer end of the spiral spring spirally extends along the length direction of the fixed rod and is connected to the bottom of the spiral spring. The inner end of the spiral spring is connected to the rotating shaft.

2. The instrument that is easy to manufacture and assemble as claimed in claim 1, characterized in that: An anti-vibration buffer layer is provided on the inner side wall of the plug-in cavity, and the anti-vibration buffer layer is made of silicone material.

3. The instrument that is easy to manufacture and assemble as claimed in claim 2, characterized in that: A limiting protrusion is protruding from the mounting platform. When the end head is mounted on the mounting platform, one side of the end head abuts against the limiting protrusion.

4. The instrument that is easy to manufacture and assemble as claimed in claim 3, characterized in that: The instrument housing is provided with a horizontal fastener for connecting with the vehicle rod, and one end of the horizontal fastener is rotatably connected with the limiting protrusion.

5. The instrument that is easy to manufacture and assemble as claimed in claim 4, characterized in that: The horizontal fastener includes a connecting strip and a fastening strip that is enclosed with the connecting strip to form a fastening cavity. One end of the fastening strip is hingedly connected to one end of the connecting strip, and the other end of the fastening strip is connected to the connecting strip by a screw. The other end of the connecting strip is rotatably connected to the limiting protrusion.

6. The instrument that is easy to manufacture and assemble as claimed in claim 5, characterized in that: When two limiting protrusions are protruding from the mounting platform, the two limiting protrusions are relatively spaced apart to form a limiting area, the limiting area is located above the plug-in cavity, and the two are connected to each other, and the two limiting protrusions are respectively connected to horizontal fasteners.

7. The instrument that is easy to manufacture and assemble as claimed in claim 6, characterized in that: A locking piece is protruded from both sides of the mounting platform. The locking piece is located in the limiting area, and one side of the locking piece is docked on the limiting protrusion; the bottom of the end head is concave inwardly to form a locking groove that matches the shape of the locking piece.

8. The instrument easy to manufacture and assemble according to any one of claims 1 to 7, characterized in that: A wire pulley is provided at the entrance of the wiring cavity, and a non-slip rubber layer is provided on the surface of the wire pulley. The wire pulley is arranged opposite to the transition wire groove, and the rim of the wire pulley has a V-shaped groove structure. A nesting seat docked with the rotating shaft is provided on the dust cover, and a bearing is provided on the top of the rotating shaft, and the bearing is plugged and nested with the nesting seat.

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