Directivity-adjustable array sound box

Abstract

The utility model provides a directivity adjustable array sound box, which comprises a sound box main body, the sound box main body comprises a shell, a waveguide body and two horn bodies, the front side wall of the shell is provided with mounting holes for accommodating the horn bodies, the front sides of the two horn bodies are respectively provided with mounting grooves, the two mounting grooves are respectively and rotatably connected with two horn guide plates, and the horn guide plates are arranged in the two horn guide plates. The ends, close to each other, of the two horn guide plates are hinged into the two mounting grooves respectively, and a damping positioning assembly is arranged between at least one side wall of each horn guide plate and the inner wall of the corresponding mounting groove and used for positioning the two horn guide plates when the two horn guide plates move close to each other or open to set positions. Guide assemblies are arranged between the sides, away from the hinge shafts, of the two horn guide plates and the inner walls of the corresponding installation grooves in a hidden mode. According to the directivity-adjustable array sound box disclosed by the utility model, the angles of the upper and lower horn guide plates can be easily adjusted, so that the sound direction is adjusted, the adjusting structure is simple, and the horn guide plates are stable and reliable in the rotating process.

Description

TECHNICAL FIELD

[0001] The utility model relates to array loudspeaker technology field, specifically, relate to a directivity adjustable array loudspeaker. BACKGROUND

[0002] The loudspeaker is a kind of device that restores electric signal into sound signal, and restores reality as the important standard of evaluating the performance of loudspeaker.Active loudspeaker is the sound system with power amplifier (i.e. power amplifier), power amplifier and loudspeaker sound system are made into an organic whole, can be directly matched with general sound source (such as MP3, CD machine, DVD player, video recorder etc.), constitutes a complete sound combination.When the loudspeaker needs to use higher point, generally through the direct elevation of loudspeaker support or wall-mounted support connection on the wall or building surface.

[0003] The loudspeaker on the market mainly includes loudspeaker box, loudspeaker, waveguide and horn body, waveguide is fixed in loudspeaker box, loudspeaker is fixed with the sound wave entrance of waveguide, horn body is connected at the sound wave outlet end of waveguide, when loudspeaker sounds, spherical sound wave emitted by loudspeaker can enter waveguide and horn body in turn, and plane sound wave is converted to spherical sound wave generated by loudspeaker through the guide surface of horn guide plate, and the sound wave signal is outwardly propagated.

[0004] In practical application, due to the difference of use scene, the range of sound propagation direction angle and distance are different, and the opening angle of horn is changed to realize the adjustment of directivity at present.The angle adjusting structure of existing technology for wrap angle guide plate is complex, and the appearance degree is poor, and the adjustment is inconvenient, and the manufacturing cost is high. Utility model content

[0005] In order to overcome at least one defect in the above prior art, the utility model provides a kind of array loudspeaker with adjustable directivity, and the angle of upper and lower horn guide plate can be easily adjusted, so as to adjust sound direction, and the adjusting structure is simple, and the rotation process of horn guide plate is stable and reliable.

[0006] The utility model provides a directivity adjustable array sound box: including sound box main part, the sound box main part includes the casing and is located casing inner chamber lower extreme waveguide body, the waveguide body is close to the upper and lower sides of one end of casing front lateral wall all is provided with the connecting plate, two the connecting plate on respectively number horn body is connected, two the horn body between leaves the gap to form the sound outlet, the mounting hole for accommodating the horn body is seted up on the front lateral wall of casing, the front side of two horn body is provided with the mounting groove that is symmetrical up and down, two the mounting groove in respectively rotatory connection has two horn guide plates that is horn shape distribution, two the horn guide plate close to one end in two mounting groove is respectively articulated, the at least one side wall of two horn guide plate and the inner wall of corresponding mounting groove is provided with damping positioning assembly, is positioned to two horn guide plate each other close or open movement to the set position, the guide assembly for guiding and limiting the rotation between two horn guide plate far away from the articulated axle side and corresponding mounting groove inner wall is hiddenly provided.

[0007] Compared with the prior art, the array sound box has the following advantages:

[0008] In the array sound box structure, the horn guide plate angle adjusting structure for changing the sound directivity is simple in structure and convenient to operate. Specifically, damping positioning assemblies are arranged between the side walls of two oppositely arranged horn guide plates and the inner walls of the mounting grooves. That is, when an external force is applied to the horn guide plates, and the external force is greater than the damping force of the damping positioning assemblies, the horn guide plates can be driven to rotate around the joint shaft to a set position, the opening angle of the horn is adjusted, and the two horn guide plates can be stably positioned when the angle is adjusted to the set angle. More importantly, the horn guide plates can be guided and limited by the guide assemblies when rotating, ensuring the stability of rotation without jamming. The guide assemblies are hiddenly arranged in the mounting grooves, so that the specific structure of the guide assemblies cannot be seen from the outside, thereby improving the appearance of the overall horn structure.

[0009] The array sound box is suspended and installed by the special suspension assembly, and the suspension beams at both ends of the suspension assembly are provided with hanging arms. The lower ends of the two hanging arms are detachably connected to the two corresponding sound box main bodies by the connecting cross bars, so that the array sound box is stably suspended. More importantly, the two hanging arms at both ends of the suspension beam in the structure can be adjusted in position along the length direction of the suspension beam, so that the spacing between the two hanging arms can be adjusted, thereby allowing the user to select two adjacent sound box main bodies for connection or two spaced sound box main bodies for connection, thereby increasing the application range. In addition, a plurality of first connecting holes are arranged on the two connecting cross bars. When the two hanging arms cooperate with the first connecting holes at different positions, the inclination direction of the array sound box can be adjusted to adapt to the adjustment of the sound directivity distance in different scenes.

[0010] As improved, the left and right side walls of each said horn guide plate are provided with an arc-shaped recessed sliding groove, and the center of the arc-shaped sliding groove coincides with the rotating axis of the horn guide plate, and a plurality of positioning grooves are arranged in the arc-shaped recessed sliding groove at a certain distance, and the depth of the positioning groove is greater than the depth of the arc-shaped sliding groove; the two side walls of the mounting groove are provided with glass beads screws, and the steel balls of the two glass beads screws are respectively slidingly fitted in the arc-shaped sliding groove.

[0011] Further improved, the side plates of the two said horn guide plates away from the hinge end with the horn body are first arc-shaped plates, and the inner walls of the two said mounting grooves matched with the first arc-shaped plates are second arc-shaped surfaces. In the improved structure, the arc-shaped matching surface makes the horn guide plate rotate more stably and reliably.

[0012] Preferably, the guiding assembly includes two positioning convex ridges arranged on the outer walls of the first arc-shaped plates, and the two positioning convex ridges extend along the width direction of the horn guide plate, and the positions opposite to the two positioning convex ridges on the second arc-shaped surface are provided with positioning grooves, and the two positioning convex ridges are respectively slidingly fitted in the two positioning grooves.

[0013] Further improved, the first arc-shaped plate is provided with an open groove on both sides in the length direction of the two said positioning convex ridges, and the open groove is perpendicular to the length direction of the positioning convex ridges. In the improved structure, the positioning convex ridges can be elastically deformed after receiving downward force, which facilitates the initial assembly stage, and the positioning convex ridges can be smoothly installed into the entrance end of the mounting groove.

[0014] Further improved, the front side walls of the two said horn guide plates and the ends away from each other are provided with two left and right spaced operation grooves. In the improved structure, after the operation grooves are arranged, the user can directly insert the fingers to apply force for rotating the horn guide plate, which is very convenient.

[0015] Further improved, the top plate of the sound box body is detachably connected with a mounting bottom plate extending in the front-rear direction, the upper end surface of the mounting bottom plate is connected with a vertical rib plate extending in the length direction, and a plurality of hanging through holes are arranged on the vertical rib plate in the length direction. In the improved structure, the sound box body can adjust the inclination angle in the up-down direction according to the change of the position of the hanging through hole, so as to change the distance of the sound pointing.

[0016] Further improved, the front and rear ends of the top plate are connected with fixing plates, each of the fixing plates is provided with a gourd hole, and the top plate is provided with an avoiding counterbore at a position corresponding to the gourd hole; the lower end surface of the mounting bottom plate is connected with two joists for respectively clamping with each gourd hole.

[0017] Further improved, the gourd hole comprises a small-diameter hole and a large-diameter hole arranged in front and back of the sound box body and penetrating each other, the fixing plate at the rear end of the top plate is provided with a first positioning insertion hole, one end of the mounting bottom plate is provided with a second positioning insertion hole, and a positioning lock pin is inserted in the second positioning insertion hole, when the two ends of the mounting bottom plate are clamped in the two gourd holes on the top plate through the two joists from back to front, the first positioning insertion hole corresponds to the second positioning insertion hole, and the lower end of the positioning lock pin is inserted and matched in the first positioning insertion hole. In the improved structure, the positioning lock pin structure is arranged so that the connecting cross bar cannot move horizontally after being clamped with the fixing plate, avoiding the joist from being pulled out of the gourd hole, and ensuring the stability of the connecting structure

[0018] Other improved features and advantages of the present application will be set forth in the following detailed description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a perspective view of the array loudspeaker with adjustable directivity of the present application;

[0020] Figure 2 It is another angle perspective view of the array loudspeaker with adjustable directivity of the present application;

[0021] Figure 3 It is an exploded schematic view of the connecting cross bar and the sound box body connecting structure in the present application;

[0022] Figure 4 It is another angle exploded schematic view of the connecting cross bar and the sound box body connecting structure in the present application;

[0023] Figure 5 It is a structural schematic view of the sound box body in the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, sound box body; 2, shell; 3, waveguide; 4, horn body; 5, mounting groove; 6, horn guide plate; 7, arc-shaped sliding groove; 8, positioning groove; 9, glass bead screw; 10, first arc-shaped plate; 12, second arc-shaped surface; 13, positioning convex rib; 14, positioning groove; 15, opening slot; 16, operation groove; 17, mounting bottom plate; 18, vertical rib plate; 19, hanging through hole; 20, fixed plate; 21, gourd hole; 22, joist; 23, first positioning jack; 24, second positioning jack; 25, positioning lock pin; 26, connecting plate; 27, mesh cover. DETAILED DESCRIPTION

[0026] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0027] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0028] In the embodiments of the present application, unless otherwise explicitly specified and limited, the "upper end" or "lower end" of the first feature to the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium.

[0029] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0030] Referring to Figures 1-5 The embodiments of the present application disclose an array sound box with adjustable directivity, which comprises a sound box body 1. The sound box body 1 in this structure can be used individually or assembled together.

[0031] The present embodiment specifically expands the structure of a single sound box body 1.

[0032] The sound box body 1 comprises a shell 2 and a waveguide body 3 located at the lower end of the inner cavity of the shell 2, the waveguide body 3 is provided with a connecting plate 26 on the upper and lower sides of the end of the front side wall of the shell 2, the two connecting plates 26 are respectively connected with a horn body 4, a gap is left between the two horn bodies 4 to form a sound outlet, a mesh cover is usually added to the sound outlet in actual application, and a mounting hole for accommodating the horn body 4 is formed in the front side wall of the shell 2; the front side of the two horn bodies 4 is respectively provided with an upper and lower symmetrical mounting groove 5, two horn guide plates 6 in the shape of a horn are respectively and rotatably connected in the two mounting grooves 5, and the front side wall of the two horn guide plates 6 is an outwardly convex arc surface, one end of the two horn guide plates 6 close to each other is respectively hinged to the inner wall of the corresponding position of the two mounting grooves 5, and in addition, a damping positioning assembly is arranged between at least one side wall of the two horn guide plates 6 and the inner wall of the corresponding mounting groove 5, so as to position the mutual approaching or opening movement of the two horn guide plates 6 to a set position, that is, under the action of the damping positioning assembly, the two horn guide plates 6 can be opened or closed to rotate to a set opening position and be stably positioned, and the specific structure of the damping positioning assembly will be described later; in addition, a guide assembly for guiding and limiting the rotation of the side of the two horn guide plates 6 away from the hinged shaft and the inner wall of the corresponding mounting groove 5 is arranged in a hidden manner.

[0033] Referring to the accompanying drawings Figure 4 In the embodiment, the structure of the damping positioning assembly mainly comprises a positioning sliding groove and a positioning protrusion, specifically, the left and right side walls of the two horn guide plates 6 are respectively provided with an arc-shaped sliding groove 7 recessed inward to form a positioning sliding groove, and the center of the arc-shaped sliding groove 7 coincides with the rotation axis of the horn guide plate 6, and a plurality of positioning grooves 14 are arranged at a set distance apart at the bottom of each arc-shaped groove, and the depth of the positioning groove 14 is greater than the depth of the arc-shaped sliding groove 7; the two side walls of the mounting groove 5 are respectively provided with a glass bead screw 9, and the steel balls of the two glass bead screws 9 are respectively and slidingly matched in the arc-shaped sliding groove 7; when the two horn guide plates 6 are relatively rotated to a set angle, the steel balls of the two glass bead screws 9 are respectively matched and positioned in the corresponding positioning grooves 14 in the two arc-shaped sliding grooves 7, and at this limiting angle, the two horn guide plates 6 are not easy to rotate, when it is necessary to change the angle between the horns again, the horn guide plate 6 needs to be pulled with a little more force, and when the steel ball is separated from the corresponding positioning groove 14, it can be easily rotated until the steel ball is again matched and positioned in the positioning groove 14 at the other set angle, the structure is simple, and the adjustment is convenient, the angle between the horn guide plates 6 is adjusted to adjust the sound directivity of the sound box.

[0034] In addition, in the embodiment, the side plate of the two horn guide plates 6 away from the hinged end with the horn body 4 is a first arc-shaped plate 10 outwardly convex, and the inner wall of the two mounting grooves 5 matched with the first arc-shaped plate 10 is an inwardly recessed second arc-shaped surface 12.

[0035] More specifically, the guide assembly includes two positioning protrusions 13 arranged at intervals on the outer wall of the first arc-shaped plate 10, and the positioning protrusions 13 extend along the width direction of the horn guide plate 6; the second arc-shaped surface 12 is provided with positioning grooves 14 at positions opposite to the two positioning protrusions 13, and the two positioning protrusions 13 are respectively slidably fitted in the two positioning grooves 14. In this structure, the positioning protrusions 13 and the positioning grooves 14 can limit the horn guide plate 6 left and right during rotation, avoiding interference and jamming during rotation. In addition, the positioning protrusions 13 and the positioning grooves 14 are hidden inside the mounting groove 5, so that the specific structure cannot be seen from the outside, thereby improving the appearance of the horn structure.

[0036] Referring to the accompanying drawings Figure 4 In this embodiment, the first arc-shaped plate 10 is further provided with opening grooves 15 on both sides of the two positioning protrusions 13 in the length direction, and the opening grooves 15 are perpendicular to the length direction of the positioning protrusions 13. After the opening grooves 15 are arranged, the positioning protrusions 13 can be elastically deformed downward under vertical stress, so that the positioning protrusions 13 on the first arc-shaped plate 10 can be smoothly clamped into the slot of the mounting groove 5 during installation of the horn guide plate 6.

[0037] Referring to the accompanying drawings Figure 4 In addition, in the above structure, the front side walls of the two horn guide plates 6 are each provided with two left and right spaced apart operation grooves 16 at the ends away from each other. When the angle of the horn guide plate 6 needs to be adjusted, two fingers or a special tool are clamped into the two operation grooves 16 to drive the horn guide plate 6 to rotate in the mounting groove 5, which is very convenient, and the appearance is relatively flat and simple without extra protruding parts.

[0038] On the other hand, in this embodiment, the sound pointing direction can also be adjusted by adjusting the up-down inclination angle of the sound box body 1. Specifically, a mounting bottom plate 17 extending in the front-rear direction is detachably connected to the top plate of the sound box body 1, the upper end surface of the mounting bottom plate 17 is connected with a vertical rib plate 18 extending in the length direction, and a plurality of hanging through holes 19 arranged in the length direction are arranged on the vertical rib plate 18. When the sound box body 1 is hung, the inclination angle of the sound box body 1 can be changed by changing the position of the hanging through hole 19, thereby adjusting the sound pointing direction of the sound box.

[0039] Referring to the accompanying drawings Figure 5 The detachable connection between the mounting bottom plate 17 and the sound box top plate means that a connecting plate 26 is connected to each of the front and rear ends of the top plate, a gourd-shaped hole 21 is arranged on each of the two connecting plates 26, and a relief counterbore is arranged on the top plate at a position corresponding to the gourd-shaped hole 21; two joist nails 22 are connected to the lower end surface of the mounting bottom plate 17 for clamping and fitting with the respective gourd-shaped holes 21.

[0040] More specifically, each of the gourd holes 21 comprises a small-diameter hole and a large-diameter hole arranged in front and back of the sound box body 1 and penetrating each other, and the horizontal nail cap of the dowel 22 is larger than the small-diameter hole and smaller than the large-diameter hole; that is, when the mounting bottom plate 17 is connected with the fixed plate 20, the two dowels 22 are inserted from the large-diameter hole positions of the two gourd holes 21 respectively, and then the mounting bottom plate 17 is horizontally moved until the two dowels 22 are clamped in the small-diameter holes respectively, and the clamping positioning of the mounting bottom plate 17 and the fixed plate 20 is realized by the limiting of the horizontal nail cap.

[0041] In the embodiment, in order to further ensure the stability of the clamping structure of the mounting bottom plate 17 and the fixed plate 20, and avoid the horizontal backward movement of the mounting bottom plate 17, which leads to the risk of the dowel 22 being separated from the large-diameter hole, the first positioning insertion hole 23 is arranged on the fixed plate 20 at the rear end of the top plate of the sound box body 1, one end of the mounting bottom plate 17 is provided with the second positioning insertion hole 24, and the positioning lock pin 25 is inserted and assembled in the second positioning insertion hole 24, when the two ends of the mounting bottom plate 17 are clamped in the two gourd holes 21 on the top plate by the two dowels 22 respectively, the first positioning insertion hole 23 corresponds to the second positioning insertion hole 24, and the lower end of the positioning lock pin 25 is inserted and assembled in the first positioning insertion hole 23, which is used for limiting the horizontal direction of the mounting point, preventing it from moving horizontally backward.

[0042] In the description of the embodiments of the present application, it should be noted that in the description of the present application, the terms indicating the direction or position relationship of "front, rear, left, right" are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or member must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] In the description of the present application, the description of the terms "the present embodiment", "some embodiments" and the like means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0044] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed by the present application can be easily conceived by the person skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A directivity-adjustable array speaker, comprising a speaker body (1), wherein the speaker body (1) comprises a shell (2) and a waveguide body (3) located at the lower end of the inner cavity of the shell (2), and the waveguide body (3) is provided with a connecting plate (26) on each of the upper and lower sides of one end of the front side wall of the shell (2), and a horn body (4) is connected to each of the two connecting plates (26), and a gap is left between the two horn bodies (4) to form a sound outlet, and a mounting hole for accommodating the horn body (4) is formed in the front side wall of the shell (2), characterized in that: The front side of each of the two said horn bodies (4) is provided with an upper and lower symmetrical mounting groove (5), two horn guide plates (6) in the shape of a horn are rotatably connected in the two said mounting grooves respectively, the end of the two said horn guide plates (6) close to each other is hingedly connected in the two said mounting grooves (5) respectively, and a damping positioning assembly is arranged between at least one side wall of the two said horn guide plates (6) and the inner wall of the corresponding mounting groove (5) to position the mutual approaching or opening movement of the two said horn guide plates (6) to a set position; a guide assembly for guiding and limiting the rotation of the side of the two said horn guide plates (6) away from the hinged shaft and the inner wall of the corresponding mounting groove (5) is arranged in a hidden manner.

2. The arrayable loudspeaker of claim 1, wherein: The left and right side walls of each said horn guide plate (6) are provided with an arc-shaped sliding groove (7) concave inward, and the center of the arc-shaped sliding groove (7) coincides with the rotation axis of the horn guide plate (6); a plurality of positioning grooves (14) are arranged in the arc-shaped sliding groove (7) at a set distance, and the depth of the positioning groove (14) is greater than the depth of the arc-shaped sliding groove (7); the two side walls of the mounting groove (5) are provided with glass bead screws (9), and the steel balls of the two said glass bead screws (9) are slidingly fitted in the arc-shaped sliding groove (7).

3. The array speaker with adjustable directivity according to claim 1 or 2, characterized in that: The side plate of the two said horn guide plates (6) away from the hinged end with the horn body (4) is a first arc-shaped plate (10) convex outward, and the inner wall of the two said mounting grooves (5) matched with each first arc-shaped plate (10) is a second arc-shaped surface (12) concave inward.

4. The array speaker with adjustable directivity according to claim 3, wherein: The guide assembly comprises two positioning convex ribs (13) arranged at intervals on the outer wall of the first arc-shaped plate (10), and the two said positioning convex ribs (13) extend along the width direction of the horn guide plate (6); the second arc-shaped surface (12) is provided with a positioning groove (14) at a position opposite to the two said positioning convex ribs (13); and the two said positioning convex ribs (13) are slidingly fitted in the two said positioning grooves (14) respectively.

5. The array speaker with adjustable directivity according to claim 4, wherein: An open groove (15) is formed on the first arc-shaped plate (10) at both sides of the length direction of the two said positioning convex ribs (13), and the open groove (15) is perpendicular to the length direction of the positioning convex rib (13).

6. The array speaker with adjustable directivity according to claim 4, wherein: Two operation grooves (16) are formed on the front side wall of the two said horn guide plates (6) and away from each other.

7. The arrayable loudspeaker of claim 1, wherein: The top plate of the sound box body (1) is detachably connected with a mounting bottom plate (17) extending in the front and rear direction thereof, the upper end surface of the mounting bottom plate (17) is connected with a vertical rib plate (18) extending in the length direction thereof, and a plurality of hanging through holes (19) are formed in the vertical rib plate (18) and arranged in the length direction thereof.

8. The array speaker with adjustable directivity according to claim 7, wherein: The front and rear ends of the top plate are connected with fixing plates (20), the fixing plates (20) are provided with gourd holes (21), and the top plate is provided with a relief counterbore corresponding to the gourd hole (21); and the lower end surface of the mounting bottom plate (17) is connected with two I-shaped nails (22) for clamping cooperation with the gourd holes (21) respectively.

9. The array speaker with adjustable directivity according to claim 8, characterized in that: The gourd hole (21) includes small diameter holes and large diameter holes arranged in front and back of the sound box body (1) and penetrating each other, the fixed plate (20) at the rear end of the top plate is provided with a first positioning insertion hole (23), one end of the mounting bottom plate (17) is provided with a second positioning insertion hole (24), and a positioning lock pin (25) is inserted in the second positioning insertion hole (24), when the two ends of the mounting bottom plate (17) are respectively clamped in the two gourd holes (21) on the top plate through two I-shaped nails (22) from back to front, the first positioning insertion hole (23) corresponds to the second positioning insertion hole (24), and the lower end of the positioning lock pin (25) is inserted and matched in the first positioning insertion hole (23).

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