CN220748577U - Detachable connection structure of fan blades and portable rechargeable tent fan - Google Patents

Abstract

A detachable connection structure of fan blades and a portable rechargeable tent fan comprise a connection groove, wherein a pin hole is formed in the connection groove and vertically penetrates through the connection groove; the connecting plate can be adaptively clamped with the connecting groove; the connecting plate is provided with a positioning hole; the bolt is arranged in the pin hole and can axially move relative to the pin hole; the end of the bolt extending into the pin hole is provided with a plunger which can be inserted into the positioning hole in an adaptive manner; the pin hole is divided into a narrow hole section and a wide hole section downwards along the opening of the pin hole, an inner retaining shoulder is formed at the joint of the narrow hole section and the wide hole section, and an outer retaining shoulder corresponding to the inner retaining shoulder is arranged at the upper end of the plunger. By using the utility model, the fan blade can be detachably mounted, and the fan blade is easy and firm to assemble and disassemble, and parts are not easy to lose.

Description

Detachable connection structure of fan blades and portable rechargeable tent fan

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a fan blade detachable connection structure and a portable charging tent fan.

Background

Tent is used as a common short-time outdoor residence, is popular with people because of the advantages of being foldable, light and convenient, and people can hang the charging ceiling fan on the suspender of the tent to achieve the purposes of ventilation, heat dissipation and mosquito repelling in the tent using process.

The prior charging ceiling fan body is large in small fan blades, the fan blades are formed integrally, the fan blades are inconvenient to store and carry and are easy to damage in the transportation process, aiming at the problem, the current Chinese patent publication No. CN 209569181U discloses a portable ceiling fan for a tent, the fan blades can be retracted and retracted in the range of a disc through a reset mechanism, and the fan blades are thrown out for use by utilizing inertia when in use.

Disclosure of Invention

In order to solve the problems that in the prior art, when a rechargeable ceiling fan is used, fan blades are not easy to store, the fan blades are troublesome to assemble and disassemble, and parts are easy to lack, the utility model aims to provide a detachable connection structure for fan blades, a plunger at the lower end of the plunger is inserted into or separated from a pin hole and a positioning hole through axially moving the plunger in the pin hole, so that detachable connection is formed between the fan blades and a fan shell, the installation is convenient, in addition, an inner retaining shoulder arranged in the pin hole is abutted against an outer retaining shoulder of the plunger to prevent the plunger from separating from the pin hole, the plunger and the pin hole are integrally connected, and compared with the prior screw connection, the situation that the subsequent use cannot be normally caused because parts are not worried about losing after the disassembly and storage is performed.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the detachable connection structure of the fan blade comprises a connection groove, wherein a pin hole is formed in the connection groove, and the pin hole vertically penetrates through the connection groove; the connecting plate can be adaptively clamped with the connecting groove; the connecting plate is provided with a positioning hole; the bolt is arranged in the pin hole and can axially move relative to the pin hole; the end of the bolt extending into the pin hole is provided with a plunger which can be inserted into the positioning hole in an adaptive manner; the pin hole is divided into a narrow hole section and a wide hole section downwards along the opening of the pin hole, an inner retaining shoulder is formed at the joint of the narrow hole section and the wide hole section, and an outer retaining shoulder corresponding to the inner retaining shoulder is arranged at the upper end of the plunger.

Through above-mentioned scheme, the mode of originally installing the connection flabellum through fastener (mechanism screw or hand screw), during the use, through the bolt in the axial displacement pinhole, make the plunger grafting of bolt lower extreme or break away from pinhole, locating hole for form the detachable connection between flabellum and the fan casing, whole assembly and disassembly process is simple convenient, in addition, the pinhole is sectional type structure, keeps off the shoulder outside on the shoulder axial butt plunger through the interior fender shoulder of narrow hole section and wide hole section junction, prevent the bolt to break away from the pinhole, make bolt and pinhole form integrated connection, compare in former screw connection, do not worry after dismantling and take in and lose the emergence of the situation that the spare part leads to follow-up unable normal use.

Preferably, the latch is provided with a slip-proof structure at the position corresponding to the wide hole section.

Through above-mentioned scheme, accessible limited slip structure carries out axial spacing to the bolt, is fixed in locating hole top with the plunger of bolt connection, prevents that the bolt from freely moving and causing the interference to installing and removing in the pinhole, improves the smoothness nature of installing and removing the process.

Preferably, the anti-slip structure comprises a through hole arranged at one end of the bolt close to the plunger, at least two elastic petals are respectively formed at the through hole by the bolt, and a bulge is arranged at the outer wall of the petals.

Through above-mentioned scheme, during the dismantlement, the accessible lifts the bolt, makes protruding butt slot section force the radial contraction of gathering together of lamella body, protruding homeopathic card inserts slot section and with slot section inner wall butt, thereby produces axial friction through protruding and slot section mutual butt and reaches limited slip purpose, is fixed in the locating hole top with the plunger, prevents that the plunger from freely removing in the pinhole and producing the interference to installing and removing, and fixed process is light laborsaving, and overall structure is simple, and manufacturing cost is lower, easily promotes.

Preferably, the connection structure further comprises an elastic movable plate, one end of the movable plate is connected with the connection plate, a buckle is arranged on the upper surface of one end of the movable plate, which is far away from the connection plate, a stop block and a clamping groove are sequentially arranged on the upper surface of the inner wall of the connection groove along the entry direction of the notch of the inner wall of the connection groove, and an inclined plane is arranged on the lower surface of the inner wall of the connection groove.

Another object of the present utility model is to provide a portable rechargeable tent fan, comprising:

a motor; a fan housing which is driven to rotate by a motor; a fan blade; the fan blade detachable connection structure comprises a fan shell, a fan blade detachable connection structure and a fan blade detachable connection structure.

Through the scheme of complaining, help realizing the lightweight design of flabellum, when fan rotates, the quality concentrates on fan housing more, and the air-out is more peaceful stable.

Preferably, the fan housing is composed of a first housing and a second housing, and the connecting groove is formed at a joint of the first housing and the second housing.

Through above-mentioned scheme, fan casing adopts split type structure, the spread groove form in first casing with the junction of second casing, be convenient for actual production processing, assembly.

Preferably, the device further comprises an elastic movable plate, one end of the movable plate is connected to the connecting plate, and a buckle is arranged on the upper surface of one end of the movable plate, which is far away from the connecting plate; the upper surface of the inner wall of the connecting groove is sequentially provided with a stop block and a clamping groove along the entering direction of the notch of the connecting groove, and the lower surface of the inner wall of the connecting groove is provided with an inclined plane.

Through above-mentioned scheme, when the connecting plate got into the spread groove, can earlier by dog butt buckle, make the buckle get into the draw-in groove, constitute and dismantle the joint, accomplish preliminary spacing and fixed to the flabellum, help the locating hole of connecting plate accomplish with the location of pinhole, reduce the installation degree of difficulty, and the connecting plate is accomplished pegging graft through the buckle with the draw-in groove, further radial constraint to the flabellum has been realized, the flabellum is more inseparable with fan housing's connection, help weakening the radial vibration that produces when the flabellum is rotatory, in addition, when dismantling the flabellum, only need the manual pressing movable piece, make it take place elastic deformation, make the buckle break away from the draw-in groove can, easy operation.

Preferably, the clamping groove is communicated with the upper inner wall of the connecting groove upwards.

Through the scheme, the clamping groove upwards penetrates through the upper inner wall of the connecting groove, so that the clamping groove is exposed, a user can observe the connection condition of the clamping buckle and the clamping groove when the fan blade is assembled and disassembled, and the assembling and disassembling speed and accuracy are improved.

Preferably, one end of the movable plate far away from the connecting plate is also provided with a pressing block for pressing by external force.

Through above-mentioned scheme, set up the briquetting, the user is more simple and easy, laborsaving to fly leaf applied pressure when dismantling.

Preferably, the device further comprises at least two positioning grooves, wherein the positioning grooves are respectively arranged at two ends of the notch of the connecting groove; the positioning blocks can be connected with the positioning grooves in an adaptive clamping mode, the number of the positioning blocks is at least two, and the positioning blocks are arranged at the left end and the right end of the connecting plate in a vertical connecting plate clamping direction.

Through above-mentioned scheme, set up the constant head tank at the notch both ends of spread groove, when the connecting plate is connected with the spread groove, the locating piece on it together with the constant head tank joint, form the circumference two-way spacing to the connecting plate, the circumferential vibration when effectively reducing the flabellum rotation improves the connection compactness of flabellum and fan housing.

Compared with the prior art, the utility model has the advantages that:

1. the fan blades and the fan shell are detachably connected through the connecting structure, wherein the bolts are integrally connected with the connecting grooves, and compared with the prior fan blades, the fan blades are more convenient to assemble and store in a screw connection mode, and parts are not easy to lose after the fan blades are detached;

2. the anti-slip structure is arranged on the plug pin, so that the axial limit of the plug pin can be realized, the plunger is prevented from interfering assembly and disassembly, and in the transportation process, the noise generated by the up-and-down movement of the plug pin in the plug pin can be avoided;

3. a movable plate is additionally arranged on the connecting plate and is connected with a clamping groove on the connecting groove through a buckle, so that the radial stability of the fan blade is further enhanced;

4. the positioning groove and the positioning block are arranged to form circumferential bidirectional limit to the connecting plate, so that circumferential vibration of the fan blade during rotation is effectively reduced.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic view of the internal structure of the present utility model;

fig. 3 is a schematic structural diagram of a detachable connection structure of fan blades according to an embodiment of the utility model:

FIG. 4 is a schematic diagram illustrating a detachable connection structure of fan blades according to a third embodiment of the present utility model;

FIG. 5 is a schematic view of a latch according to a third embodiment of the present utility model;

FIG. 6 is a schematic perspective view of the fan blade without the fan blade according to the present utility model;

FIG. 7 is an enlarged view at A in FIG. 6;

FIG. 8 is a schematic perspective view of a fan blade according to the present utility model;

FIG. 9 is an enlarged view at B in FIG. 8;

reference numerals: 1. a lifting bar; 2. a power supply box; 3. a motor; 4. a fan housing; 41. a first housing; 42. a second housing; 5. a fan blade; 6. a connecting groove; 61. a pin hole; 611. a narrow bore section; 612. a wide bore section; 613. an inner shoulder; 62. a plug pin; 621. a pin cover; 622. a plunger; 623. an outer shoulder; 63. a slip-resistant structure; 631. a protrusion; 632. an annular groove; 633. a rubber ring; 634. a through hole; 635. a valve body; 64. a stop block; 65. a clamping groove; 66. an inclined plane; 67. a positioning groove; 7. a connecting plate; 71. positioning holes; 72. a movable plate; 73. a buckle; 74. pressing the blocks; 75. and (5) positioning blocks.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to the accompanying drawings:

the specific implementation mode of the utility model is as follows: as shown in fig. 1 and 2, a portable tent fan that charges includes a lifting bar 1, a power box 2 is connected with in the lifting bar 1 bottom, a motor 3 is fixedly connected with in the power box 2 lower extreme, motor 3 and power box 2 circuit connection are provided with fan housing 4 outward, evenly be provided with two piece at least flabellum 5 along fan housing 4 periphery, during operation, be fixed in the tent top by lifting bar 1 fixed connection jib with the complete machine, power box 2 charges energy supply driving motor 3 work, motor 3 rotation drive fan housing 4 and flabellum 5 rotate, ventilate the tent inside, dispel the heat.

The fan blades 5 and the fan housing 4 are connected by a detachable fan blade connection structure (hereinafter referred to as a connection structure).

The following describes the connection structure specifically:

as shown in fig. 2 to 9, in this embodiment, the connection structure includes a connection groove 6 disposed at the peripheral edge of the fan housing 4, the connection groove 6 is provided with a pin hole 61, the pin hole 61 is provided with a narrow hole section 611 and a wide hole section 612 along the opening thereof, the wide hole section 612 vertically penetrates the connection groove 6, an inner blocking shoulder 613 is formed at the joint of the narrow hole section 611 and the wide hole section 612, a latch 62 is slidably connected in the narrow hole section 611, the upper end of the latch 62 extends out of the narrow hole section 611 and is elastically clamped with a pin cover 621, the lower end of the latch 62 extends into the wide hole section 612 and is provided with a plunger 622 slidably connected with the wide hole section 612, an outer blocking shoulder 623 corresponding to the inner blocking shoulder 613 is formed at the joint of the plunger 622 and the latch 62, in addition, the connection structure further includes a connection plate 7 capable of being adapted to be clamped with the connection groove 6, one end of the connection plate 7 is fixedly arranged on the fan blade 5, and a positioning hole 71 for adapting and inserting the plunger 622 is provided on the connection plate 7.

In use, the plunger 622 at the lower end of the latch 62 can be inserted into or separated from the positioning hole 71 by axially moving the latch 62, so that a simple and easy-to-operate detachable connection is formed between the fan blade 5 and the fan housing 4. In addition, in the process of axially moving the bolt 62 in the pin hole 61, the inner blocking shoulder 613 at the lower end of the narrow hole section 611 can be abutted against the outer blocking shoulder 623 of the plunger 622, so that the bolt 62 is prevented from being separated from the pin hole 61, and the bolt 62 and the pin hole 61 form an integral connection, and compared with the original screw connection, the fan can not be normally used due to the fact that parts are lost after disassembly and storage.

In this embodiment, technical features such as the connecting slot 6, the pin hole 61, the pin 62 and the like in the connecting structure are arranged on the fan housing 4, technical features such as the connecting plate 7, the positioning hole 71 and the like in the connecting structure are arranged on the fan blade 5, so that the light weight and simplified design of the fan blade 5 can be realized, the quality is concentrated on the fan housing 4 when the fan rotates, and the air outlet is more smooth and stable. However, according to the replacement principle, after reading the present embodiment, those skilled in the art should be able to conceive that the technical features of the connecting slot 6, the pin hole 61, the pin 62, etc. are disposed on the fan blade 5, and the technical features of the connecting plate 7, the positioning hole 71, etc. are disposed on the fan housing 4, so that the technical scheme possibly formed will not be repeated in the present embodiment.

In order to reduce the assembly difficulty and facilitate practical production and processing, in this embodiment, the fan housing 4 is composed of a first housing 41 and a second housing 42, and the connection groove 6 is formed at a joint of the first housing 41 and the second housing 42.

Considering that the free movement of the latch 62 in the pin hole 61 will interfere when the fan blade 5 is assembled and disassembled, the user needs to manually limit the latch 62, so that the smoothness of assembly and disassembly can be reduced, and the embodiment can be further set as follows: the sliding-preventing structure 63 is disposed at the position of the bolt 62 corresponding to the wide hole section 612, and a user can axially limit the bolt 62 through the sliding-preventing structure 63 according to the requirement, cut off the relative sliding between the bolt 62 and the pin hole 61, and fix the plunger 622 above the positioning hole 71.

Three different embodiments of the slip resistant structure 63 are provided below:

in the first embodiment, the anti-slip structure 63 includes a protrusion 631 disposed on the outer sidewall of the plug 62, and a support plate disposed on the inner wall of the wide hole 612 and having elasticity, when in use, the protrusion 631 is upwards abutted against the support plate by lifting the plug 62, the support plate is upwards turned and deformed to generate a gap, after the protrusion 631 passes through the gap generated by the deformation of the support plate, the support plate is restored to the original state, and the protrusion 631 is downwards abutted against the support plate, so that the plunger 622 is fixed above the positioning hole 71.

In the second embodiment, the anti-slip structure 63 includes an annular groove 632 disposed at one end of the latch 62 near the plunger 622, a rubber ring 633 is sleeved in the annular groove 632, and the outer wall of the rubber ring 633 abuts against the inner wall of the wide hole 612. In this embodiment, when the plug 62 is not acted by an external force, the friction force generated by the contact between the rubber ring 633 and the wide hole 612 is fixed at a certain position inside the pin hole 61, and when the plug 62 is disassembled, a user can apply an axial force to the plug 62 according to the requirement, so that the plug 62 overcomes the friction force generated by the contact between the rubber ring 633 and the wide hole 612 and moves to the target position. Compared with the first embodiment, the operation is simpler, the pin 62 is only required to be processed, the production cost is lower, but the force is required to be continuously applied every time the pin 62 is moved, and the labor is wasted.

In the third embodiment, the anti-slip structure 63 includes a through hole 634 formed on the plug 62, at least two elastic petals 635 are formed on the plug 62 at the through hole 634, and protrusions 631 are disposed on the outer wall of the petals 635. Through set up the through-hole 634 on bolt 62, reduce the inside radial structural strength of bolt 62 and set up the through-hole 634 both sides department and form elastic lamella 635 in bolt 62, under the condition that does not influence bolt 62 removal, when need carry out spacing to bolt 62, only need through lifting bolt 62, butt narrow hole section 611 by the protruding 631 outside the lamella 635, make the radial shrink of gathering of lamella 635 and then card access narrow hole section 611 to realize the axial spacing to bolt 62. In this embodiment, the pin 62 is only required to be machined, and compared with the second embodiment, the pin 62 is only required to be fixed by a single force application, and the protrusion 631 is clamped into the narrow hole 611, so that the operation is more labor-saving and convenient.

In order to reduce radial vibration of the connecting plate 7 and the connecting groove 6 in the working process of the fan, the fan blade 5 is tightly connected with the fan shell 4. The present embodiment further provides that an elastic movable plate 72 is disposed on the connecting plate 7, one end of the movable plate 72 is connected with the connecting plate 7, the other end of the movable plate can elastically swing relative to the connecting plate 7, a buckle 73 is disposed on an upper surface of an end of the movable plate 72 far away from the connecting plate 7, a stop block 64 and a clamping groove 65 are sequentially disposed on an upper surface of an inner wall of the connecting groove 6 along a slot entry direction of the connecting groove, and an inclined surface 66 for swinging the movable plate 72 is disposed on an end of a lower surface of the inner wall of the connecting groove 6 near the slot. Through the above scheme, when connecting plate 7 card connection groove 6, can carry out the butt earlier by dog 64 of spread groove 6 opening part to buckle 73, force buckle 73 to drive movable plate 72 and take place elastic swinging relative inclined plane 66, and then with buckle 73 homeopathic joint in draw-in groove 65 for form the elasticity joint between spread groove 6 and the connecting plate 7, radial vibration that produces when helping weakening flabellum 5 rotation, in addition, when needs dismantlement flabellum 5, only need through pressing movable plate 72, make it take place elastic deformation again and can accomplish the separation of buckle 73 and draw-in groove 65, whole assembly and disassembly process is simple convenient, easy operation.

Further, the clamping groove 65 is upwardly penetrated through the upper inner wall of the connecting groove 6, so that the clamping groove 65 is exposed, and a user can observe the connection condition of the clamping buckle 73 and the clamping groove 65 when the fan blade 5 is assembled and disassembled, thereby improving the assembling and disassembling speed and accuracy.

Further, in order to facilitate the user to apply pressure to the movable plate 72 during the disassembly, as shown in fig. 3 and 5, a pressing block 74 is provided at an end of the movable plate 72 away from the connection plate 7.

Further, the notch both ends of spread groove 6 respectively are equipped with constant head tank 67, and correspondingly, respectively be equipped with the locating piece 75 that is used for joint constant head tank 67 in the both ends of spread groove 7, during the installation, by constant head tank 67 joint locating piece 75, form the circumference two-way spacing to spread groove 7, effectively reduce the circumferential vibration when flabellum 5 rotates, make flabellum 5 and fan housing 4 be connected more closely.

The above embodiments are merely illustrative embodiments of the present utility model, but the technical features of the present utility model are not limited thereto, and any changes or modifications made by those skilled in the art within the scope of the present utility model are included in the scope of the present utility model.

Claims (10)

1. A fan blade detachable connection structure is characterized in that: comprising

A connecting groove (6) provided with a pin hole (61), wherein the pin hole (61) vertically penetrates through the connecting groove (6);

the connecting plate (7) can be adaptively clamped with the connecting groove (6); a positioning hole (71) is formed in the connecting plate (7);

a pin (62) disposed in the pin hole (61) and axially movable with respect to the pin hole (61);

wherein, one end of the bolt (62) extending into the pin hole (61) is provided with a plunger (622) which can be inserted into the positioning hole (71) in an adapting way; the pin hole (61) is provided with a narrow hole section (611) and a wide hole section (612) downwards along the opening of the pin hole, an inner retaining shoulder (613) is formed at the joint of the narrow hole section (611) and the wide hole section (612), and the upper end of the plunger (622) is provided with an outer retaining shoulder (623) corresponding to the inner retaining shoulder (613).

2. The detachable connection structure of fan blades according to claim 1, wherein: and a slip-proof structure (63) is arranged at the position of the bolt (62) corresponding to the wide hole section (612).

3. The detachable connection structure of fan blades according to claim 2, wherein: the anti-slip structure (63) comprises a through hole (634) arranged at one end of the plug pin (62) close to the plunger (622), at least two elastic clacks (635) are respectively formed at the through hole (634) of the plug pin (62), and a bulge (631) is arranged at the outer wall of the clacks (635).

4. The detachable connection structure of fan blades according to claim 2, wherein: the anti-slip structure (63) comprises an annular groove (632) arranged at one end of the plug pin (62) close to the plunger (622), a rubber ring (633) is sleeved in the annular groove (632), and the outer wall of the rubber ring (633) is abutted against the inner wall of the wide hole section (612).

5. A portable tent fan that charges which characterized in that: comprising a detachable connection of fan blades (5) according to any of claims 1-4, comprising a motor (3); a fan housing (4) which is driven to rotate by the motor (3); a fan blade (5); the fan comprises a fan shell (4), wherein a connecting groove (6) of a detachable connecting structure of the fan blade (5) is formed in the periphery of the fan shell, and a connecting plate (7) of the detachable connecting structure of the fan blade (5) is arranged at the root of the fan blade (5).

6. The portable rechargeable tent fan of claim 5, wherein: the fan housing (4) is composed of a first housing (41) and a second housing (42), and the connecting groove (6) is formed at the joint of the first housing (41) and the second housing (42).

7. The portable rechargeable tent fan of claim 5 or 6, wherein: the movable plate (72) with elasticity is connected to the connecting plate (7) at one end, and a buckle (73) is arranged on the upper surface of one end, far away from the connecting plate (7), of the movable plate (72); the upper surface of the inner wall of the connecting groove (6) is sequentially provided with a stop block (64) and a clamping groove (65) along the notch entering direction of the connecting groove, and the lower surface of the inner wall of the connecting groove (6) is provided with an inclined surface (66).

8. The portable rechargeable tent fan of claim 7, wherein: the clamping groove (65) upwards penetrates through the upper inner wall of the connecting groove (6).

9. The portable rechargeable tent fan of claim 7, wherein: one end of the movable plate (72) far away from the connecting plate (7) is also provided with a pressing block (74) for pressing by external force.

10. The portable rechargeable tent fan of claim 5, wherein: the device also comprises positioning grooves (67), wherein the number of the positioning grooves is at least two and the positioning grooves are respectively arranged at two ends of the notch of the connecting groove (6); the positioning blocks (75) can be adaptively clamped with the positioning grooves (67), the number of the positioning blocks is at least two, and the positioning blocks are perpendicular to the clamping direction of the connecting plate (7) and are arranged at the left end and the right end of the connecting plate (7).