Mobile test box

Abstract

The invention discloses a mobile test box, which can be properly mounted and fixed according to the sizes, shapes, heights, widths and the like of different experimental equipment or products through flexible connection and adjustment modes among an outer box body, a vertical frame, a mounting mechanism, a clamping mechanism and the like. According to the mobile test box, the use range and efficiency of the mobile test box are improved, the position and state of the mobile test box can be adjusted and fixed according to different ground conditions and experiment conditions by arranging the stability and firmness of the components such as the supporting legs, the box cover and the bottom support, and the safety and reliability of the mobile test box are improved; the movable test box is reasonable in structure, complete in function and high in adaptability, experiment requirements of different fields and different levels can be met, and a convenient experiment environment is provided for scientific research, teaching, production and the like.

Description

Technical Field

[0001] The invention relates to the technical field of test boxes, in particular to a mobile test box. Background Art

[0002] The test chamber is a kind of equipment used for various experiments. It has the characteristics of convenient transportation, quick installation, flexible adjustment, etc. It is widely used in scientific research, teaching, production and other fields. The common test chambers on the market have certain defects: 1. The structure of the mobile test box is complex and requires multiple components, which increases the cost and maintenance difficulty of the product; 2. The size and weight of the mobile test box are large, which is inconvenient to carry and store, limiting the scope of use and efficiency of the product; 3. The installation and fixing methods of the mobile test chamber are not flexible and stable enough, and are easily affected by external environmental factors, resulting in changes in the position and status of the product; 4. It is not convenient to move and adjust the test piece after it is fixed in the mobile test chamber, which reduces the convenience of operation.

[0003] In view of this, a mobile test box is now designed. Summary of the invention

[0004] The object of the present invention is to provide a mobile test box to solve the problems existing in the existing test boxes mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a mobile test box, comprising an outer box body, a stand, several groups of mounting mechanisms, a dome light source, a clamping mechanism and a display screen; The bottom of the outer box is fixedly connected with four groups of legs in a regular matrix, the upper edges of both sides of the outer box are fixedly connected with handles, the front opening of the outer box is flipped and connected with a box cover through a hinge, and the front side of the outer box is fixedly connected with a magnetic buckle seat; The supporting legs are provided with universal wheels; The inner side of the box cover is fixedly connected with a magnetic buckle; The stand is arranged on the inner side of the outer box body, the bottom of the stand is fixedly connected with a mounting base, the mounting base is fixedly connected to the inner bottom of the outer box body by bolts, and a locking hole is opened in the surface of the stand; Several groups of the mounting mechanisms are movably arranged on the stand, and the mounting mechanisms include a first movable frame, two groups of connecting rods, a crossbeam, two groups of bottom brackets, a first knob, and a second mounting screw, wherein: The first movable frame is movably mounted on the stand; Two groups of connecting rods are transversely fixed and inserted into the first movable frame; The crossbeam is fixedly connected to the two sets of connecting rods, and two sets of transverse grooves are opened through the crossbeam; Two sets of bottom supports are movably connected to the crossbeam; The second mounting screw is inserted and connected in the first movable frame through a thread structure; The first knob and the second mounting screw are connected to the outer side of the first movable frame; The dome light source is fixed to one of the mounting mechanisms by bolts; The clamping mechanism is movably arranged on the stand, and comprises a second movable frame, a connecting member, a stand, two sets of transverse axes, two sets of clamping blocks, a rotating rod and a second knob, wherein: The second movable frame is movably mounted on the stand; The connecting piece is fixedly connected to the second movable frame; The stand is fixedly connected to the connecting piece; Two sets of transverse axes are fixedly connected to the inner side of the frame; Two groups of clamping blocks are movably arranged on the inner side of the frame, and two groups of clamping blocks are movably sleeved on the outer sides of the two groups of horizontal axes; The rotating rod is inserted and connected in the two sets of clamping blocks and the inner side of the frame; The second knob is fixedly connected to the rotating rod; The display screen is fixedly connected to the inner bottom of the outer box.

[0006] Preferably, a base frame is connected to the bottom of the supporting leg via a threaded structure, an anti-skid pad is fixedly connected to the bottom of the base frame, and the anti-skid pad extends to the bottom of the universal wheel through rotation.

[0007] Preferably, the box cover is connected to the front opening of the outer box body by flipping, and the magnetic buckle is magnetically connected to the magnetic buckle seat by flipping the box cover.

[0008] Preferably, the bottom of the outer box body is provided with a plurality of groups of internal threaded holes in a regular annular array, and the internal threaded holes are suitable for installation on the mounting base.

[0009] Preferably, the inner width and length of the first movable frame are respectively matched with the width and length of the stand.

[0010] Preferably, the base bracket includes an L-shaped bracket, a slider, a first mounting screw and a strip mounting hole, the L-shaped bracket, the slider and the first mounting screw are fixedly connected in sequence, the strip mounting hole is opened through along the length extension direction of the L-shaped bracket, the slider is slidably connected in the transverse groove, and the height of the slider is adapted to the height of the transverse groove, and the first mounting screw extends to the outside of the transverse groove.

[0011] Preferably, a plurality of groups of locking holes are equidistantly provided along the extension direction of the stand height, and the second mounting screw is connected to the locking hole via a threaded structure.

[0012] Preferably, a first thread and a second thread are provided on the surface of the rotating rod, the thread directions of the first thread and the second thread are opposite, and the first thread and the second thread are respectively connected to the inner sides of the two groups of clamping blocks through a thread structure.

[0013] Preferably, a wiring mechanism is provided at the inner bottom of the outer box body, and the wiring mechanism includes several groups of wire troughs and several groups of wire covers, several groups of wire troughs are equidistantly fixedly connected to the inner bottom of the outer box body, and several groups of wire covers are respectively fixedly connected to the tops of the several groups of wire troughs by bolts.

[0014] Preferably, the top of the wire trough and the bottom of the wire cover are both concave arc structures.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The mobile test box can be properly installed and fixed according to the size, shape, height, width, etc. of different experimental equipment or products by setting flexible connection and adjustment methods between the outer box, stand, installation mechanism, clamping mechanism and other components, thereby increasing the use scope and efficiency of the mobile test box; 2. The mobile test box can improve the stability and firmness of its components by setting legs, box cover, bottom support, etc., and can adjust and fix the position and state of the mobile test box according to different ground conditions and experimental conditions, thereby increasing the safety and reliability of the mobile test box; 3. The mobile test box can provide appropriate lighting and display effects according to different experimental requirements by setting auxiliary functions of dome light source, display screen and other components, thereby increasing the practicality and aesthetics of the mobile test box; 4. The mobile test box provides a mobile test box with reasonable structure, complete functions and strong adaptability, which can meet the experimental needs of different fields and levels, and provide a convenient experimental environment for scientific research, teaching, production, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of a mobile test box of the present invention; Figure 2 A mobile test box of the present invention Figure 1 The enlarged view of point A in the middle; Figure 3 Another structural schematic diagram of a mobile test box of the present invention; Figure 4 It is a partial structural schematic diagram of a mobile test box of the present invention; Figure 5 This is a schematic diagram of the structure of a dome light source of a mobile test box of the present invention; Figure 6 This is a schematic diagram of a crossbeam structure of a mobile test box of the present invention; Figure 7 This is a schematic diagram of the bottom support structure of a mobile test box of the present invention; Figure 8 It is a partial top view of the structure of a mobile test box of the present invention; Fig. 9 This is a schematic diagram of the structure of a clamping mechanism of a mobile test box of the present invention; Fig.10 The present invention is a partial side structural sectional view of a clamping mechanism of a mobile test box.

[0017] In the figure: 1. Outer box; 11. Outriggers; 12. Universal wheels; 13. Base frame; 14. Anti-slip pad; 15. Handle; 16. Box cover; 17. Magnetic buckle seat; 18. Magnetic buckle; 19. Internal thread hole; 2. Stand; 21. Mounting base; 22. Locking hole; 3. Installation mechanism; 31. First movable frame; 32. Connecting rod; 33. Crossbeam; 331, transverse groove; 34, bottom bracket; 341, L-shaped bracket; 342, slider; 343, first mounting screw; 344, strip-shaped mounting hole; 35, first knob; 36. Second mounting screw; 4. Dome light source; 5. Clamping mechanism; 51. Second movable frame; 52. Connecting piece; 53. Stand; 54, horizontal axis; 55, clamping block; 56, rotating rod; 561, first thread; 562, second thread; 57, second knob; 6. Cable routing mechanism; 71. Cable trough; 72. Cable cover; 7. Display screen. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] See also Figure 1-10 The present invention provides a technical solution: a mobile test box, including an outer box body 1, a stand 2, a plurality of mounting mechanisms 3, a dome light source 4, a clamping mechanism 5 and a display screen 7.

[0022] The bottom of the outer box body 1 is fixedly connected with four groups of legs 11 in a regular matrix, handles 15 are fixedly connected to the upper edges of both sides of the outer box body 1, a box cover 16 is connected to the front opening of the outer box body 1 through a hinge, and a magnetic buckle seat 17 is fixedly connected to the front side of the outer box body 1.

[0023] Universal wheels 12 are mounted on the supporting legs 11 .

[0024] The bottom of the legs 11 is connected to a base frame 13 through a threaded structure, and the bottom of the base frame 13 is fixedly connected to an anti-skid pad 14, which is extended to the bottom of the universal wheel 12 by rotation. Specifically, when the anti-skid pad 14 is above the bottom surface of the universal wheel 12, the universal wheel 12 can be used to move the outer box 1, and when the anti-skid pad 14 is extended to the bottom of the universal wheel 12 by rotation, the anti-skid pad 14 supports the outer box 1 to prevent movement, and the corresponding heights of the four groups of anti-skid pads 14 can be adjusted according to different ground conditions to increase the stability and safety of the mobile test box.

[0025] A magnetic buckle 18 is fixedly connected to the inner side of the box cover 16 .

[0026] The box cover 16 is connected to the front opening of the outer box body 1 by flipping, and the magnetic buckle 18 is magnetically connected to the magnetic buckle seat 17 by flipping the box cover 16. Specifically, in this way, the box cover 16 can be easily opened or closed to protect various equipment in the mobile test box, and at the same time, the adsorption effect of the magnetic buckle 18 and the magnetic buckle seat 17 is used to increase the sealing and firmness of the box cover 16.

[0027] The stand 2 is arranged on the inner side of the outer box 1 , and a mounting base 21 is fixedly connected to the bottom of the stand 2 . The mounting base 21 is fixedly connected to the inner bottom of the outer box 1 by bolts. A locking hole 22 is opened in the surface of the stand 2 .

[0028] The bottom of the outer box 1 is provided with a plurality of groups of internal threaded holes 19 in a regular annular array, and the internal threaded holes 19 are suitable for installing the mounting base 21. Specifically, in this way, according to different experimental requirements, the appropriate position and quantity can be selected to fix the mounting base 21 to the inner bottom of the outer box 1, thereby realizing flexible installation and disassembly of the stand 2, and the internal threaded holes 19 can be used for the installation requirements of other components such as the display screen 7 and the wiring mechanism 6.

[0029] Several groups of mounting mechanisms 3 are movably arranged on the stand 2, and the mounting mechanisms 3 include a first movable frame 31, two groups of connecting rods 32, a crossbeam 33, two groups of bottom brackets 34, a first knob 35, and a second mounting screw 36, wherein: The first movable frame 31 is movably mounted on the stand 2; Two groups of connecting rods 32 are transversely fixed and inserted into the first movable frame 31; The cross beam 33 is fixedly connected to the two groups of connecting rods 32, and two groups of transverse grooves 331 are formed through the cross beam 33; Two sets of bottom brackets 34 are movably connected to the crossbeam 33; The second mounting screw 36 is inserted and connected in the first movable frame 31 through a thread structure; The first knob 35 and the second mounting screw 36 are connected to the outer side of the first movable frame 31 .

[0030] The inner width and length of the first movable frame 31 are respectively adapted to the width and length of the stand 2. Specifically, the first movable frame 31 can be freely moved up and down on the stand 2, so as to achieve height adjustment of the mounting mechanism 3, thereby adapting to experimental equipment or products of different heights.

[0031] The bottom bracket 34 includes an L-shaped bracket 341, a slider 342, a first mounting screw 343 and a strip mounting hole 344. The L-shaped bracket 341, the slider 342 and the first mounting screw 343 are fixedly connected in sequence. The strip mounting hole 344 is opened through along the length extension direction of the L-shaped bracket 341. The slider 342 is slidably connected in the transverse groove 331, and the height of the slider 342 is adapted to the height of the transverse groove 331. The first mounting screw 343 extends to the outside of the transverse groove 331. Specifically, the free horizontal movement of the two groups of bottom brackets 34 on the crossbeam 33 can be controlled by the slider 342 and the transverse groove 331, so that the width adjustment of the installation mechanism 3 for different components can be realized, so as to adapt to experimental equipment or products of different widths. At the same time, the nut can be locked on the first mounting screw 343 to realize the fixation of the bottom bracket 34. After the position of the bottom bracket 34 is fixed, the experimental equipment or product can be installed on the strip mounting hole 344 by bolts and nuts, so as to increase the stability and firmness of the installation mechanism 3.

[0032] The dome light source 4 is fixed to one of the mounting mechanisms 3 by means of bolts.

[0033] For details, please refer to the attached manual. Figure 4 The dome light source 4 is installed on a group of mounting mechanisms 3 stacked above through a base 34, and the equipment or product to be tested can be installed on a group of mounting mechanisms 3 below through the base 34.

[0034] The clamping mechanism 5 is movably arranged on the stand 2, and the clamping mechanism 5 comprises a second movable frame 51, a connecting member 52, a stand 53, two sets of transverse shafts 54, two sets of clamping blocks 55, a rotating rod 56, and a second knob 57, wherein: The second movable frame 51 is movably mounted on the stand 2; The connecting member 52 is fixedly connected to the second movable frame 51; The stand 53 is fixedly connected to the connecting member 52; Two sets of transverse shafts 54 are fixedly connected to the inner side of the frame 53; The two groups of clamping blocks 55 are movably arranged on the inner side of the frame 53, and the two groups of clamping blocks 55 are movably sleeved on the outer sides of the two groups of horizontal shafts 54; The rotating rod 56 is inserted and connected in the two sets of clamping blocks 55 and the inner side of the stand 53; The second knob 57 is fixedly connected to the rotating rod 56 .

[0035] Specifically, the inner width and length of the second movable frame 51 are respectively matched with the width and length of the stand 2 , and the second movable frame 51 can be height-adjusted and fixed on the stand 2 in the same manner as the first movable frame 31 .

[0036] Several groups of locking holes 22 are evenly spaced along the height extension direction of the stand 2, and the second mounting screw 36 is connected to the locking hole 22 through a threaded structure. Specifically, according to different experimental requirements, a suitable locking hole 22 can be selected, and the second mounting screw 36 can be screwed into the locking hole 22, thereby fixing the position of the first movable frame 31 and increasing the stability and firmness of the mounting mechanism 3.

[0037] The surface of the rotating rod 56 is provided with a first thread 561 and a second thread 562, the thread directions of the first thread 561 and the second thread 562 are opposite, and the first thread 561 and the second thread 562 are respectively connected to the inner sides of the two groups of clamping blocks 55 through the thread structure. Specifically, by rotating the second knob 57, the rotating rod 56 can drive the two groups of clamping blocks 55 to move inward or outward at the same time, so as to achieve the clamping or loosening of the clamping mechanism 5, thereby conveniently fixing or replacing the experimental equipment or products.

[0038] The inner bottom of the outer box 1 is provided with a wiring mechanism 6, which includes a plurality of wire troughs 71 and a plurality of wire covers 72. The plurality of wire troughs 71 are fixedly connected to the inner bottom of the outer box 1 at equal intervals, and the plurality of wire covers 72 are fixedly connected to the tops of the plurality of wire troughs 71 by bolts. Specifically, through the functions of the plurality of wire troughs 71 and the plurality of wire covers 72, various wires or signal wires in the mobile test box can be arranged in order in the wire troughs 71, and the wire covers 72 are used to cover and protect them, so as to avoid confusion and damage of the wires or signal wires, and at the same time improve the aesthetics and neatness of the mobile test box.

[0039] The top of the wire trough 71 and the bottom of the wire cover 72 are both concave arc structures. Specifically, this allows the wire trough 71 and the wire cover 72 to fit the shape of the wire more closely, achieves stable pressure holding of the wire, avoids affecting the normal operation of the wire or signal line, and increases the contact area between the wire trough 71 and the wire cover 72, thereby improving the stability and firmness of the wire cover 72.

[0040] The display screen 7 is fixedly connected to the inner bottom of the outer box body 1. Specifically, by setting auxiliary functions of the dome light source 4, the display screen 7 and other components, suitable lighting and display effects can be provided according to different experimental requirements, thereby increasing the practicality and aesthetics of the mobile test box. The dome light source 4 can be used for diffusion. The dome light source 4 is an economical light source with uniform lighting. The large angle of the dome light source 4 can help to image curved, bright and uneven surfaces. The dome light source 4 can completely eliminate shadows and improve the detection effect through multiple reflections on the hemispherical inner wall.

[0041] Specifically, the mobile test box is composed of an outer box body 1, a stand 2, several groups of mounting mechanisms 3, a dome light source 4, a clamping mechanism 5 and a display screen 7. In this way, the basic structure and function of the mobile test box can be realized, and a convenient experimental environment can be provided for experimental needs in different fields and at different levels. By setting flexible connections and adjustment methods among the components such as the outer box body 1, the stand 2, several groups of mounting mechanisms 3, the dome light source 4, and the clamping mechanism 5, appropriate installation and fixation can be performed according to the size, shape, height, width, etc. of different experimental equipment or products, thereby increasing the scope of use and efficiency of the mobile test box.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mobile test box, characterized in that: It comprises an outer box (1), a stand (2), a plurality of mounting mechanisms (3), a dome light source (4), a clamping mechanism (5) and a display screen (7); The bottom of the outer box (1) is fixedly connected to four groups of legs (11) in a regular matrix, the upper edges of both sides of the outer box (1) are fixedly connected to handles (15), the front opening of the outer box (1) is flipped and connected to a box cover (16) through a hinge, and the front side of the outer box (1) is fixedly connected to a magnetic buckle seat (17); The supporting legs (11) are provided with universal wheels (12); A magnetic buckle (18) is fixedly connected to the inner side of the box cover (16); The stand (2) is arranged on the inner side of the outer box (1); the bottom of the stand (2) is fixedly connected to a mounting base (21); the mounting base (21) is fixedly connected to the inner bottom of the outer box (1) by bolts; a locking hole (22) is provided in the surface of the stand (2); A plurality of groups of the mounting mechanisms (3) are movably arranged on the stand (2), the mounting mechanisms (3) comprising a first movable frame (31), two groups of connecting rods (32), a crossbeam (33), two groups of bottom brackets (34), a first knob (35) and a second mounting screw (36), wherein: The first movable frame (31) is movably mounted on the stand (2); Two groups of connecting rods (32) are laterally fixedly inserted and connected in the first movable frame (31); The crossbeam (33) is fixedly connected to the two groups of connecting rods (32), and two groups of transverse grooves (331) are formed through the crossbeam (33); Two sets of bottom brackets (34) are movably connected to the crossbeam (33); The second mounting screw (36) is inserted and connected in the first movable frame (31) via a threaded structure; The first knob (35) and the second mounting screw (36) are connected to the outer side of the first movable frame (31); The dome light source (4) is fixed to one of the mounting mechanisms (3) by means of bolts; The clamping mechanism (5) is movably arranged on the stand (2), and comprises a second movable frame (51), a connecting member (52), a stand (53), two groups of transverse axes (54), two groups of clamping blocks (55), a rotating rod (56) and a second knob (57), wherein: The second movable frame (51) is movably mounted on the stand (2); The connecting member (52) is fixedly connected to the second movable frame (51); The stand (53) is fixedly connected to the connecting member (52); Two sets of transverse shafts (54) are fixedly connected to the inner side of the frame (53); The two groups of clamping blocks (55) are movably arranged on the inner side of the frame (53), and the two groups of clamping blocks (55) are movably sleeved on the outer sides of the two groups of horizontal shafts (54); The rotating rod (56) is inserted and connected in the two groups of clamping blocks (55) and the inner side of the stand (53); The second knob (57) is fixedly connected to the rotating rod (56); The display screen (7) is fixedly connected to the inner bottom of the outer box (1).

2. A mobile test box according to claim 1, characterized in that: A base frame (13) is connected to the bottom of the support leg (11) via a threaded structure, and an anti-skid pad (14) is fixedly connected to the bottom of the base frame (13), and the anti-skid pad (14) extends to the bottom of the universal wheel (12) through rotation.

3. A mobile test box according to claim 1, characterized in that: The box cover (16) is connected to the front opening of the outer box body (1) by turning over, and the magnetic buckle (18) is magnetically connected to the magnetic buckle seat (17) by turning over the box cover (16).

4. A mobile test box according to claim 1, characterized in that: The bottom of the outer box body (1) is provided with a plurality of groups of internal thread holes (19) in a regular annular array, and the internal thread holes (19) are suitable for mounting a mounting base (21).

5. The mobile test box according to claim 1, characterized in that: The inner width and length of the first movable frame (31) are respectively adapted to the width and length of the stand (2).

6. The mobile test box according to claim 1, characterized in that: The base bracket (34) comprises an L-shaped bracket (341), a slider (342), a first mounting screw (343) and a strip-shaped mounting hole (344); the L-shaped bracket (341), the slider (342) and the first mounting screw (343) are fixedly connected in sequence; the strip-shaped mounting hole (344) is opened through along the length extension direction of the L-shaped bracket (341); the slider (342) is slidably connected in the transverse groove (331); the height of the slider (342) matches the height of the transverse groove (331); and the first mounting screw (343) extends to the outside of the transverse groove (331).

7. The mobile test box according to claim 1, characterized in that: A plurality of groups of locking holes (22) are equidistantly formed along the height extension direction of the stand (2), and the second mounting screw rod (36) is connected to the locking hole (22) via a threaded structure.

8. The mobile test box according to claim 1, characterized in that: A first thread (561) and a second thread (562) are provided on the surface of the rotating rod (56); the thread directions of the first thread (561) and the second thread (562) are opposite, and the first thread (561) and the second thread (562) are respectively connected to the inner sides of the two groups of clamping blocks (55) through thread structures.

9. The mobile test box according to claim 1, characterized in that: The inner bottom of the outer box body (1) is provided with a wiring mechanism (6), the wiring mechanism (6) comprising a plurality of sets of wire troughs (71) and a plurality of sets of wire covers (72), the plurality of sets of wire troughs (71) being fixedly connected to the inner bottom of the outer box body (1) at equal intervals, and the plurality of sets of wire covers (72) being fixedly connected to the tops of the plurality of sets of wire troughs (71) by bolts.

10. A mobile test box according to claim 9, characterized in that: The top of the wire slot (71) and the bottom of the wire cover (72) are both concave arc-shaped structures.

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