An ultrasonic device

Abstract

The application discloses an ultrasonic equipment, which comprises a probe plate assembly, the probe plate assembly comprising a probe plate card, a front shielding cover, a rear shielding cover and a grounding support; the probe plate card is located in a space enclosed by the front shielding cover and the rear shielding cover, and a probe socket extending out of the front shielding cover is connected to one side of the probe plate card facing the front shielding cover; the grounding support is provided with a clamping groove with an open end, and a shielding member is arranged on the groove wall of the clamping groove; and the grounding support is elastically pressed against the outer periphery of the probe socket through the shielding member. By additionally arranging the grounding support in the interior of the probe plate assembly and pressing the outer periphery of the probe socket through the shielding member on the groove wall of the clamping groove, good electromagnetic shielding of the probe socket can be achieved; during the removal of the front shielding cover, large resistance does not need to be overcome, and the front shielding cover is not prone to deformation due to removal, thereby preventing the problem that the shielding effect is deteriorated due to deformation of the front shielding cover after repeated removal, and further affecting the image quality of the ultrasonic equipment.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to an ultrasound device. Background Technology

[0002] Ultrasound equipment, such as trolley-mounted ultrasound machines, is a medical device that uses ultrasound signals to examine patients and create images to assist doctors in medical diagnosis and treatment. The core technology of ultrasound equipment lies in the quality of the ultrasound images generated; only high-quality ultrasound images can help doctors make clear and accurate judgments about the structure of vital signs.

[0003] As the front-end processing module of ultrasound equipment, the probe board assembly is designed to prevent interference with the image quality of the ultrasound equipment and to ensure that the transmitting unit does not cause radiation exposure to the human body. The probe board assembly typically includes a probe card and a shielding cover. The shielding cover consists of a front shielding cover and a rear shielding cover. The probe card is located within the space enclosed by the front and rear shielding covers. The probe card has multiple probe sockets, which protrude from the insertion holes on the front shielding cover. Each probe socket has a grounding metal spring on its outer wall. When the front and rear shielding covers are assembled together, the front shielding cover and the multiple grounding metal springs directly contact and press against each other, thereby achieving electromagnetic shielding at the gap between the probe sockets and the front shielding cover.

[0004] To ensure good electromagnetic shielding at the gap between the probe socket and the front shield, the elastic force between the front shield and the multiple grounding metal springs is generally designed to be relatively large after installation. Since there are many probe sockets on the probe board, a large number of grounding metal springs are required. This results in greater resistance when removing the front shield from the probe board assembly. During disassembly, the shield is easily bent and deformed, which is not conducive to the maintenance of the board inside the shield. Utility Model Content

[0005] Therefore, the technical problem to be solved by this application is to overcome the defect that the front shield of the probe plate assembly in the existing ultrasonic equipment is easily bent and deformed during disassembly, which is not conducive to the maintenance of the internal components of the probe plate assembly, thereby providing an ultrasonic equipment.

[0006] To solve the above-mentioned technical problems, the technical solution of this application is as follows:

[0007] An ultrasound device includes a probe plate assembly, the probe plate assembly including a probe plate clip, a front shield, a rear shield, and a grounding bracket; the probe plate clip is located within the space enclosed by the front shield and the rear shield, the side of the probe plate clip facing the front shield is connected to a probe socket extending out of the front shield, the grounding bracket has a slot with one end open, the slot wall is provided with a shielding element, and the grounding bracket is pressed against the outer periphery of the probe socket through the shielding element.

[0008] Furthermore, the probe board is mounted on the rear shield, and the front shield is detachably mounted on the rear shield.

[0009] Furthermore, multiple probe sockets are arranged side by side, and multiple slots are arranged side by side on the grounding bracket. The length direction of the slots is the same as the length direction of the probe sockets, and the openings of the multiple slots are located on the same side of the grounding bracket.

[0010] Furthermore, the shielding component is conductive foam, conductive spring sheet, or conductive foil.

[0011] Furthermore, the shielding component is an elastic conductive structure; the elastic conductive structure is snapped onto the grounding bracket, or the elastic conductive structure and the grounding bracket are an integral structure, or the elastic conductive structure is welded onto the grounding bracket.

[0012] Furthermore, the elastic conductive structure is a conductive spring, which is snapped onto the groove wall of the slot; the conductive spring includes a spring body connected to the grounding bracket, and an elastic part with one end connected to the spring body and the other end extending into the slot, the elastic part elastically abutting against the probe socket.

[0013] Furthermore, multiple elastic portions are provided along the length direction of the main body of the spring sheet, and the bending direction of the multiple elastic portions is the same.

[0014] Furthermore, the main body of the spring sheet has a three-sided enclosed structure; the main body of the spring sheet includes a first connecting piece, a second connecting piece, and a third connecting piece located on different surfaces, the second connecting piece is in contact with the groove wall of the slot, and one end of the elastic part is connected to the second connecting piece; the first connecting piece and the third connecting piece are respectively located on two sides in the thickness direction of the grounding bracket, and the first connecting piece and the third connecting piece elastically clamp the grounding bracket along the thickness direction of the grounding bracket.

[0015] Furthermore, the slot wall includes a pair of first slot walls disposed opposite to each other and a second slot wall disposed opposite to the opening; the conductive spring includes a pair of first conductive springs connected to the pair of first slot walls and a second conductive spring connected to the second slot wall; the first slot wall is provided with a groove, and the second connecting piece of the first conductive spring is engaged in the groove.

[0016] Furthermore, the grounding bracket includes a bracket base plate and bracket side plates that surround the bracket base plate on three sides. The slot is disposed on the bracket base plate, and the opening of the slot is located on the side of the bracket base plate not surrounded by the bracket side plates. The bracket side plate includes a first bracket side plate and a pair of opposing second bracket side plates. The end of the pair of second bracket side plates away from the bracket base plate is connected to an outwardly extending connecting plate. The connecting plate is face-to-face connected to the front shield. The bracket base plate is also provided with multiple connecting posts, and the front shield is detachably connected to the connecting posts through connectors.

[0017] Furthermore, the system includes an ultrasound host, with the probe plate assembly disposed within the ultrasound host. The ultrasound host includes a chassis, a front housing, a rear housing, and a main frame. The main frame is fixed to the chassis, the front housing is located on the front side of the main frame, and the rear housing is located on the rear side of the main frame. The front housing and the rear housing enclose a mounting cavity on the chassis, and the probe plate assembly is mounted on the side of the main frame facing the front housing.

[0018] The technical solution of this application has the following advantages: This probe plate assembly for ultrasound equipment, by additionally setting a grounding bracket inside the probe plate assembly, and setting a slot on the grounding bracket, with the grounding bracket elastically pressed against the outer periphery of the probe socket through a shielding component on the slot wall, achieves good electromagnetic shielding for the probe socket because the grounding bracket is grounded and the probe socket is in contact with the grounding bracket through the shielding component. Furthermore, the shielding component is mainly fixed by the grounding bracket and the probe socket. When it is necessary to remove the front shielding cover of the probe plate assembly for maintenance of the probe card inside the probe plate assembly, the front shielding cover can be directly removed from the rear shielding cover. The front shielding cover can be separated from the grounding bracket, and the shielding component on the grounding bracket does not generate significant resistance during the removal process of the front shielding cover, thus ensuring that the front shielding cover is not easily deformed during repeated disassembly and reassembly. This provides more reliable shielding protection for the probe socket and probe card, preventing the problem of reduced shielding effect due to deformation of the front shielding cover after repeated disassembly and reassembly, which could affect the image quality of the ultrasound equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a front view of the overall structure of the ultrasonic device in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the overall structure of the ultrasound host in the embodiments of this application;

[0022] Figure 3 This is an exploded view of the ultrasound host in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the overall structure of the probe board assembly in the embodiments of this application;

[0024] Figure 5 This is an exploded view of the probe plate assembly in the embodiments of this application;

[0025] Figure 6 This is a schematic diagram showing the assembly relationship of the probe board, probe socket, grounding bracket and front shield in the embodiments of this application;

[0026] Figure 7 This is a schematic diagram of the connection structure between the grounding bracket and the conductive spring in an embodiment of this application;

[0027] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0028] Figure 9 This is a schematic diagram of the overall structure of the conductive spring sheet in the embodiments of this application.

[0029] Explanation of reference numerals in the attached drawings: A. Ultrasonic main unit; B. Display device; C. Operating device; 1. Chassis; 2. Front housing; 3. Rear housing; 4. Rear handle upper housing; 5. Main unit frame; 6. Probe plate assembly; 61. Probe plate clip; 62. Front shield; 621. Through hole; 63. Rear shield; 64. Grounding bracket; 641. Bracket base plate; 6411. Slot; 6412. Groove; 642. First bracket side plate; 643. Second bracket side plate; 644. Connecting plate; 645. Connecting post; 65. Probe socket; 66. Conductive spring; 66a. First conductive spring; 66b. Second conductive spring; 661. Spring body; 6611. First connecting piece; 6612. Second connecting piece; 6613. Third connecting piece; 662. Elastic part; 67. Connector. Detailed Implementation

[0030] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] like Figure 1 The image shows an ultrasound device that uses ultrasound signals to detect patients and form images to assist doctors in medical diagnosis and treatment. The ultrasound device mainly includes an ultrasound main unit A, a display device B, and an operating device C.

[0034] The ultrasound main unit A, as a crucial component of the ultrasound equipment, primarily functions as the core controller, processing ultrasound data and generating ultrasound images. The display device B, including a monitor, is mainly used to display ultrasound images and other relevant information. The operating device C mainly includes an operation panel with buttons, knobs, or a touchscreen, allowing users to input commands to control the ultrasound equipment. The ultrasound main unit A is located at the bottom of the entire device, while the display device B and operating device C are supported above it. The bottom of the ultrasound main unit A is equipped with four casters with brake pads for movement and positioning of the ultrasound equipment.

[0035] like Figure 2 and Figure 3As shown, the ultrasound main unit A mainly includes a chassis 1, a front housing 2, a rear housing 3, a rear handle upper housing 4, a main frame 5, and a probe plate assembly 6. The chassis 1 is connected above four casters, and the main frame 5 is fixed to the chassis 1. The front housing 2 is located in front of the main frame 5, and the rear housing 3 is located behind the main frame 5. The front housing 2 and the rear housing 3 together form a mounting cavity on the chassis 1, within which the main frame 5 and the probe plate assembly 6 are located. The probe plate assembly 6 is mounted on the side of the main frame 5 facing the front housing 2, and the rear handle upper housing 4 is connected above the front housing 2 and the rear housing 3.

[0036] like Figure 4 and Figure 5 As shown, the probe board assembly 6 includes a probe card 61, a front shield 62, a rear shield 63, and a grounding bracket 64. The probe card 61 is mounted on the rear shield 63, and the front shield 62 is detachably mounted on the rear shield 63. The probe card 61 is located within the space enclosed by the front shield 62 and the rear shield 63. The front shield 62 has multiple through holes 621, and multiple probe sockets 65 are connected to the side of the probe card 61 facing the front shield 62. The multiple probe sockets 65 extend out of the front shield 62 from the multiple through holes 621. Figure 6 The grounding bracket 64 is provided with a slot 6411 with one end open. The slot wall of the slot 6411 is provided with a shield. The grounding bracket 64 is pressed against the outer periphery of the probe socket 65 through the shield to maintain reliable contact between the grounding bracket 64 and the probe socket 65. The grounding bracket 64 contacts the front shield 62 or the rear shield 61 to achieve grounding.

[0037] By additionally setting a grounding bracket 64 inside the probe plate assembly 6, and the grounding bracket 64 elastically pressing against the outer periphery of the probe socket 65 through the shielding member on the groove wall of the slot 6411, good electromagnetic shielding of the probe socket 65 can be achieved because the grounding bracket 64 is grounded and the probe socket 65 is in contact with the grounding bracket 64 through the shielding member. When it is necessary to remove the front shielding cover 62 of the probe plate assembly 6 to maintain the probe card 61 inside the probe plate assembly 6, the front shielding cover 62 can be directly removed from the rear shielding cover 63. The removal of the front shielding cover 62 does not require overcoming great resistance, so that the front shielding cover 62 is not easily deformed during repeated disassembly and reassembly. The shielding protection of the probe socket 65 and the probe card 61 by the front shielding cover 62 is more reliable, preventing the problem of poor shielding effect due to deformation after repeated disassembly and reassembly, which in turn affects the image quality of the ultrasound equipment.

[0038] like Figure 5 and Figure 6As shown, multiple probe sockets 65 are arranged side-by-side on the probe plate 61, and the grounding bracket 64 also has multiple slots 6411 arranged side-by-side. The length direction of the slots 6411 is the same as the length direction of the probe sockets 65, and the openings of the multiple slots 6411 are located on the same side of the grounding bracket 64. During the assembly and disassembly of the grounding bracket 64, the multiple slots 6411 on the grounding bracket 64 can be aligned with the multiple probe sockets 65, and the grounding bracket 64 can be inserted downwards to install the grounding bracket 64. At this time, the shielding component on the slot wall of the slot 6411 will elastically press against the outer periphery of the probe socket 65, thereby shielding the probe socket 65. Here, elastic pressing refers to the shielding component being subjected to pressure from the probe socket 65 and undergoing a certain degree of deformation.

[0039] In some embodiments, the shielding element can be a resilient conductive structure that is compressed itself when the grounding bracket 64 and the probe socket 65 are assembled together to achieve reliable contact between the probe socket 65 and the grounding bracket 64. In other alternative embodiments, the shielding element can also be conductive foam or conductive foil, which is directly filled into the gap between the probe socket 65 and the grounding bracket 64 during assembly to maintain reliable contact between them.

[0040] like Figure 6 As shown, in some embodiments, the elastic conductive structure is specifically a conductive spring 66, which is snapped into the slot 6411 of the grounding bracket 64. In other alternative embodiments, the elastic conductive structure can also be an integral part of the grounding bracket 64, or the elastic conductive structure can be welded to the grounding bracket 64, as long as the elastic conductive structure itself has specific elasticity and conductivity.

[0041] like Figure 6 and Figure 7 As shown, the groove wall of the slot 6411 on the grounding bracket 64 includes a pair of first groove walls opposite to each other and a second groove wall opposite to the opening. The length of the pair of first groove walls is greater than the length of the second groove wall. The first groove walls correspond to the long side of the probe socket 65, and the pair of first groove walls are respectively located on the outer side of the pair of long sides of the probe socket 65. The second groove wall corresponds to the wide side of the probe socket 65, and the second groove wall is located on the outer side of one of the wide sides of the probe socket 65. The conductive spring 66 includes a pair of first conductive springs 66a connected to the pair of first groove walls and a second conductive spring 66b connected to the second groove wall. The first conductive spring 66a elastically presses against the long side of the probe socket 65 and the first groove wall of the grounding bracket 64, and the second conductive spring 66b elastically presses against the wide side of the probe socket 65 and the second groove wall of the grounding bracket 64. The pair of first conductive springs 66a and the second conductive spring 66b can achieve good electromagnetic shielding at the gaps on the three different sides of the probe socket 65.

[0042] like Figure 7 and Figure 8 As shown, the conductive spring 66 includes a spring body 661 connected to the bracket base plate 641, and an elastic part 662 with one end connected to the spring body 661 and the other end extending into the slot 6411. The elastic part 662 elastically abuts against the probe socket 65. Multiple elastic parts 662 are evenly spaced along the length of the spring body 661, and all elastic parts 662 are the same size and shape. When the multiple elastic parts 662 are pressed by the probe socket 65 in the slot 6411, they generate an elastic force of the same magnitude and direction on the probe socket 65. The ends of the multiple elastic parts 662 on the first conductive spring 66a that are away from the spring body 661 all point towards the slot 6411 in the direction away from the opening. This arrangement facilitates the insertion of the grounding bracket 64 into the outside of the probe socket 65, and the two are less likely to loosen after insertion, which helps ensure shielding reliability.

[0043] like Figure 8 and Figure 9 As shown, the spring clip body 661 has a three-sided enclosed structure. The spring clip body 661 includes a first connecting piece 6611, a second connecting piece 6612, and a third connecting piece 6613 located on different surfaces. The second connecting piece 6612 is in contact with the groove wall of the slot 6411, and one end of the elastic part 662 is connected to the second connecting piece 6612. The first connecting piece 6611 and the third connecting piece 6613 are located on two sides of the grounding bracket 64 along its thickness direction, and the first connecting piece 6611 and the third connecting piece 6613 elastically clamp the grounding bracket 64 along its thickness direction. This shape of the spring clip body 661 allows for full contact with the grounding bracket 64, improving the electromagnetic shielding effect.

[0044] like Figure 7 and Figure 8 As shown, the first groove wall of the slot 6411 is provided with a groove 6412, and the second connecting piece 6612 of the first conductive spring 66a is engaged in the groove 6412; this arrangement can prevent the first conductive spring 66a from detaching from the slot 6411.

[0045] like Figure 6 and Figure 7As shown, the grounding bracket 64 includes a bracket base plate 641 and bracket side plates enclosing the bracket base plate 641 on three sides. A slot 6411 is provided on the bracket base plate 641, and the opening of the slot 6411 is located on the side of the bracket base plate 641 not enclosed by the bracket side plates. The bracket side plates include a first bracket side plate 642 and a pair of opposing second bracket side plates 643, the length of the first bracket side plate 642 being greater than the length of the second bracket side plates 643. The end of the pair of second bracket side plates 643 away from the bracket base plate 641 is connected to an outwardly extending connecting plate 644; the connecting plate 644 is connected face-to-face with the front shielding cover 62. The base plate 641 of the bracket is also provided with multiple connecting posts 645 located between two adjacent slots 6411. The connecting posts 645 are provided with threaded holes, and the front shield 62 is detachably fixed to the connecting posts 645 through connectors 67. The connecting posts 645 are provided with threaded holes, and the connectors 67 are screws that pass through the front shield 62 and are threaded into the threaded holes of the connecting posts 645. This arrangement can achieve reliable contact between the grounding bracket 64 and the front shield 62.

[0046] In summary, the ultrasound device provided in this application embodiment, by additionally setting a grounding bracket 64 inside the probe plate assembly 6, and setting a slot 6411 on the grounding bracket 64, and the grounding bracket 64 elastically pressing against the outer periphery of the probe socket 65 through the elastic conductive structure on the slot wall of the slot 6411, since the grounding bracket 64 is grounded and the probe socket 65 is in contact with the grounding bracket 64 through the elastic conductive structure, good electromagnetic shielding of the probe socket 65 can be achieved; and the elastic conductive structure is mainly fixed by the grounding bracket 64 and the probe socket 65. When it is necessary to remove the front shield 62 of the probe plate assembly 6 to maintain the probe board 61 inside the probe plate assembly 6, the front shield 62 can be directly removed from the rear shield 63. The front shield 62 can be separated from the grounding bracket 64, and the elastic conductive structure on the grounding bracket 64 will not generate much resistance to the removal process of the front shield 62. This ensures that the front shield 62 is not easily deformed during repeated disassembly and reassembly, making the shielding protection of the probe socket 65 and the probe board 61 more reliable. It also prevents the shielding effect from deteriorating due to deformation after repeated disassembly and reassembly of the front shield 62, which in turn affects the image quality of the ultrasound equipment.

[0047] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. An ultrasonic device, characterized in that, The device includes a probe board assembly (6), which includes a probe board card (61), a front shield (62), a rear shield (63), and a grounding bracket (64). The probe board card (61) is located in the space enclosed by the front shield (62) and the rear shield (63). The probe board card (61) is connected to a probe socket (65) extending out of the front shield (62) on the side facing the front shield (62). The grounding bracket (64) is provided with a slot (6411) with one end open. A shield is provided on the slot wall of the slot (6411). The grounding bracket (64) is pressed against the outer periphery of the probe socket (65) through the shield.

2. The ultrasonic device according to claim 1, characterized in that, The probe board (61) is mounted on the rear shield (63), and the front shield (62) is detachably mounted on the rear shield (63).

3. The ultrasonic device according to claim 1, characterized in that, Multiple probe sockets (65) are arranged side by side, and multiple slots (6411) are arranged side by side on the grounding bracket (64). The length direction of the slots (6411) is the same as the length direction of the probe sockets (65), and the openings of the multiple slots (6411) are located on the same side of the grounding bracket (64).

4. The ultrasonic device according to claim 1, characterized in that, The shielding component is conductive foam, conductive spring sheet (66), or conductive foil.

5. The ultrasonic device according to any one of claims 1-4, characterized in that, The shielding component is an elastic conductive structure; the elastic conductive structure is snapped onto the grounding bracket (64), or the elastic conductive structure and the grounding bracket (64) are an integral structure, or the elastic conductive structure is welded onto the grounding bracket (64).

6. The ultrasonic device according to claim 5, characterized in that, The elastic conductive structure is a conductive spring (66), which is snapped onto the groove wall of the slot (6411). The conductive spring (66) includes a spring body (661) connected to the grounding bracket (64) and an elastic part (662) with one end connected to the spring body (661) and the other end extending into the slot (6411). The elastic part (662) elastically abuts against the probe socket (65).

7. The ultrasonic device according to claim 6, characterized in that, Multiple elastic portions (662) are provided along the length direction of the main body portion (661) of the spring sheet, and the bending direction of the multiple elastic portions (662) is the same.

8. The ultrasonic device according to claim 6, characterized in that, The main body of the spring clip (661) includes a first connecting piece (6611), a second connecting piece (6612), and a third connecting piece (6613) located on different surfaces. The second connecting piece (6612) is in contact with the groove wall of the slot (6411). One end of the elastic part (662) is connected to the second connecting piece (6612). The first connecting piece (6611) and the third connecting piece (6613) are located on two sides of the grounding bracket (64) in the thickness direction, and the first connecting piece (6611) and the third connecting piece (6613) elastically clamp the grounding bracket (64) along the thickness direction of the grounding bracket (64).

9. The ultrasonic device according to claim 8, characterized in that, The slot (6411) has a pair of first slot walls arranged opposite to each other and a second slot wall arranged opposite to the opening; the conductive spring (66) has a pair of first conductive springs (66a) connected to the pair of first slot walls and a second conductive spring (66b) connected to the second slot wall; the first slot wall has a groove (6412) and the second connecting piece (6612) of the first conductive spring (66a) is engaged in the groove (6412).

10. The ultrasonic device according to any one of claims 1-4 and 6-8, characterized in that, The grounding bracket (64) includes a bracket base plate (641) and bracket side plates surrounding the bracket base plate (641) on three sides. The slot (6411) is provided on the bracket base plate (641), and the opening of the slot (6411) is located on the side of the bracket base plate (641) not surrounded by the bracket side plates. The bracket side plates include a first bracket side plate (642) and a pair of opposing second bracket side plates (643). The end of the pair of second bracket side plates (643) away from the bracket base plate (641) is connected to an outwardly extending connecting plate (644). The connecting plate (644) is connected to the front shield (62) face to face. The bracket base plate (641) is also provided with multiple connecting posts (645), and the front shield (62) is detachably connected to the connecting posts (645) through a connector (67).

Images