Supporting frame for civil engineering structural design

Abstract

The utility model discloses a support frame for civil engineering structural design, which is characterized by comprising a folding mechanism, the folding mechanism comprises a bottom plate, a stand column and an outer frame, a first hinge seat is arranged between the bottom plate and the stand column, a lifting column is arranged at one end of the stand column, and a second hinge seat and a bearing mechanism are arranged between the lifting column and the outer frame. The bearing mechanism comprises an inner frame arranged on the outer frame plate, the inner frame is of a rectangular frame structure, the two side faces of the inner frame make contact with the two side faces in the outer frame respectively, and the two ends of the inner frame are fixedly connected with main shafts. By arranging the first hinge seat and the second hinge seat, when carrying is needed, the outer frame can be overturned and folded to be in contact with the cross rod through the second hinge seat, at the moment, the outer frame is fixed to the cross rod through the positioning seat, and the device has the advantages that folding storage of the whole device is achieved, the folding state is stable and cannot be loosened, carrying is convenient, and carrying is convenient. And multi-person cooperation is not needed.

Description

Technical Field

[0001] This utility model belongs to the field of civil engineering design technology, and specifically relates to a support frame for civil engineering structural design. Background Technology

[0002] Civil engineering is a general term for the science and technology of constructing various land-based engineering facilities. It refers to all technical work, including surveying, planning, design, construction, installation, and maintenance, for the construction, renovation, or expansion of buildings, structures, and related supporting facilities, excluding residential buildings. Before civil engineering construction, structural design and drafting are often required. Support frames are frequently used in drafting and design to help workers better present the plans. Civil engineering structural design needs to comprehensively consider knowledge from multiple disciplines such as engineering mechanics, structural engineering, materials science, and building technology to achieve the design goals of safety, economy, and functionality. When conducting civil engineering structural design, it is necessary to ensure… The design process involves defining the project's functional requirements, usage requirements, and budget constraints; analyzing land conditions, topography, and environmental impacts; developing preliminary structural plans, including the selection of building form, layout, and main structural systems; conducting load analysis, including estimation and analysis of static and dynamic loads; designing and verifying major structural components such as beams, columns, and frames to ensure they can withstand the expected loads and guarantee safety; and preparing detailed structural drawings, including floor plans, sections, and detailed construction drawings, determining connection details and construction techniques, and considering the actual operation and efficiency during construction. To ensure that the drawings accurately represent the construction site, it is generally necessary to set up a support frame on-site for drawing.

[0003] A novel support frame for civil engineering structure design is proposed according to patent publication number CN214759802U, which relates to the field of civil engineering design technology. The support frame includes a horizontally positioned base, a vertically positioned hollow support column fixedly connected to the side of the base away from the ground, and an open end of the support column away from the base. A lifting and adjusting mechanism is located inside the support column, with a detachable fastener at the end of the mechanism away from the support column and a drawing board connected to the end of the fastener away from the support column via a ball joint. An annular groove is formed on the side of the base away from the ground, within which an adjusting component is slidably connected, with the end of the adjusting component away from the base hinged to the drawing board. Thus, this utility model, through the cooperation of the above mechanisms and components, can accommodate workers of different heights and allows for angle adjustment of the drawing board to meet the comfort needs of the workers, thereby expanding the application range of the support frame. However, this structural design only provides a single height adjustment function. In actual on-site engineering drawing, construction sites are often uneven, making it difficult to ensure the drawing board remains level when setting up the support frame, thus affecting the accuracy of the drawing. Furthermore, the support frame is large and occupies a lot of space, making it difficult to transport outdoors, often requiring multiple people to move the device to the construction site. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a foldable and space-saving support frame for civil engineering structure design.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a support frame for civil engineering structure design, comprising: a folding mechanism, wherein the folding structure includes a base plate, a column and an outer frame, the base plate and the outer frame are respectively located at both ends of the column, the base plate is a rectangular plate structure, the column is a cylindrical structure, the outer frame is a U-shaped plate structure, a first hinge seat is provided between the base plate and the column, the column is rotatably engaged with the base plate through the first hinge seat, a lifting column is provided at one end of the column, a second hinge seat is provided between the lifting column and the outer frame, the lifting column is rotatably engaged with the outer frame through the second hinge seat;

[0006] The supporting mechanism includes an inner frame mounted on an outer frame plate. The inner frame is a rectangular frame structure. The two sides of the inner frame are in contact with the two inner sides of the outer frame, respectively. A main shaft is fixedly connected to both ends of the inner frame. The main shaft passes through the outer frame, and the inner frame rotates with the outer frame through the main shaft.

[0007] Preferably, a fastening threaded groove is provided on the circumferential side of one end of the main shaft, and an adjusting threaded knob is screwed onto the fastening threaded groove. The adjusting threaded knob is in a pressing fit with the outer frame. A second rotating plate is provided inside the second hinge seat, and a second movable shaft is fixedly connected to the second rotating plate. The second rotating plate is hinged to the second hinge seat through the second movable shaft. A second positioning threaded knob is threaded onto the circumferential side of one end of the second movable shaft. A directional rotating shaft is provided on the lower surface of the second hinge seat, and a storage rotating shaft is provided on the upper surface of the second rotating plate. The storage rotating shaft is inserted into the lower surface of the outer frame. The outer frame is in a movable fit with the second rotating plate through the storage rotating shaft, and the second hinge seat is in a movable fit with the lifting column through the directional rotating shaft.

[0008] Preferably, a drafting board mounting groove is provided on the upper surface of the inner frame, and an extension plate is fixedly installed on the front surface of the inner frame.

[0009] Preferably, one side of the outer frame is provided with a magnetic groove and a magnetic block, the magnetic groove has a drawing tool storage slot inside, and the magnetic block is magnetically engaged with the magnetic groove.

[0010] Preferably, one end of the magnetic block is fixedly connected to an encapsulation block, and the encapsulation block is fitted into the drawing tool storage slot.

[0011] Preferably, the column has a telescopic cavity, the lifting column is located in the telescopic cavity, the lifting column slides with the column through the telescopic cavity, the column has a locking screw hole on its peripheral side, the locking screw hole is threaded with a locking screw, and one end of the locking screw is pressed with the lifting column.

[0012] Preferably, a first rotating plate is fixedly connected to the lower surface of the column, and a first movable shaft is fixedly connected to both sides of the first rotating plate. The first rotating plate is hinged to a first hinge seat through the first movable shaft. A first positioning threaded knob is screwed to the circumferential side of the first movable shaft, and the first positioning threaded knob is press-fitted with the first hinge seat.

[0013] Preferably, a plurality of inclined seats are fixedly installed on the upper surface of the base plate, and a rod groove is opened on one surface of the inclined seat, and an anchor rod is inserted into the rod groove.

[0014] Preferably, a connecting protrusion is fixedly installed on one surface of the outer frame, and there are two connecting protrusions. A connecting hole is opened on one surface of the connecting protrusion, and the connecting hole passes through the connecting protrusion.

[0015] Preferably, a crossbar is fixedly installed on the column, and a positioning hole is formed on the front surface of the crossbar. The positioning hole penetrates the crossbar, and the shape and position of the positioning hole are adapted to the connecting protrusion. A positioning seat is fixedly installed on the upper surface of the crossbar. An inner cavity is formed inside the positioning seat, and the inner cavity is connected to the connecting hole. A compression spring is fixedly connected inside the inner cavity. One end of the compression spring is fixedly connected to a plug-in post, and the plug-in post slides in fit with the inner cavity. A sliding groove is formed on one side of the positioning seat, and the sliding groove is connected to the inner cavity. A sliding block is installed inside the sliding groove, and the sliding block slides in fit with the sliding groove. One end of the sliding block is connected to the plug-in post.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This utility model, by setting a first hinge seat and a second hinge seat, allows for adjustment of the exposed length of the lifting column when it needs to be moved. The outer frame is then flipped and folded to contact the crossbar via the second hinge seat. At this point, the positioning seat is used to fix the outer frame to the crossbar, thereby achieving the folding and storage of the entire device. The folded state is stable and will not loosen, making it easy to move without the need for multiple people to cooperate. When needed, the design drawing board can be inserted into the inner frame through the drawing board mounting slot, and the drawing angle can be adjusted via the spindle to adapt to the drawing habits of different users.

[0018] 2. By setting an extension plate, the inner frame of this utility model can also be used as a support for computer equipment, which is convenient for on-site data calculation. At the same time, the tools required for drawing can be stored in the drawing tool storage slot, eliminating the need to carry them separately. The magnetic structure is used for sealing, which improves the safety of storage. Attached Figure Description

[0019] Figure 1 This is a front-view three-dimensional structural diagram of the present invention;

[0020] Figure 2 This is a front view of the present invention;

[0021] Figure 3 This is a bottom-view three-dimensional structural diagram of the present invention;

[0022] Figure 4 This is a schematic diagram of the specific structure of the outer frame of this utility model;

[0023] Figure 5 This is a schematic diagram of the internal structure of the positioning seat of this utility model;

[0024] Figure 6 This is a schematic diagram of the specific structure of the second hinge seat of this utility model.

[0025] In the diagram: 1. Column; 2. Lifting column; 3. Telescopic cavity; 4. Crossbar; 5. Positioning hole; 6. Positioning seat; 7. Locking screw; 8. First rotating plate; 9. First hinge seat; 10. Inclined seat; 11. Base plate; 12. Anchor rod; 13. Rod groove; 14. First movable shaft; 15. First positioning threaded knob; 16. Second hinge seat; 17. Magnetic block; 18. Encapsulation block; 19. Outer frame; 20. Inner frame; 2 1. Drafting board mounting slot; 22. Connecting protrusion; 23. Storage shaft; 24. Adjusting shaft; 25. Second rotating plate; 26. Second movable shaft; 27. Second positioning threaded knob; 28. Inner cavity; 29. ​​Insertion post; 30. Slide groove; 31. Sliding block; 32. Compression spring; 33. Outer extension plate; 34. Magnetic groove; 35. Connecting hole; 36. Main spindle; 37. Adjusting threaded knob; 38. Drafting tool storage slot. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1:

[0028] Please see Figures 1-6 As shown, a support frame for civil engineering structural design includes:

[0029] The folding mechanism includes a base plate 11, a column 1, and an outer frame 19. The base plate 11 and the outer frame 19 are located at both ends of the column 1. The base plate 11 is a rectangular plate structure, the column 1 is a cylindrical structure, and the outer frame 19 is a U-shaped plate structure. A first hinge seat 9 is provided between the base plate 11 and the column 1. The column 1 is rotatably engaged with the base plate 11 through the first hinge seat 9. A lifting column 2 is provided at one end of the column 1. A second hinge seat 16 is provided between the lifting column 2 and the outer frame 19. The lifting column 2 is rotatably engaged with the outer frame 19 through the second hinge seat 16.

[0030] The load-bearing mechanism includes an inner frame 20 mounted on the outer frame plate 19. The inner frame 20 is a rectangular frame structure. The two sides of the inner frame 20 are in contact with the two inner sides of the outer frame 19, respectively. Both ends of the inner frame 20 are fixedly connected to a main shaft 36, which passes through the outer frame 19. The inner frame 20 rotates with the outer frame 19 through the main shaft 36.

[0031] Specifically, a fastening threaded groove is provided on the circumferential side of one end of the main shaft 36, and an adjusting threaded knob 37 is screwed onto the fastening threaded groove. The adjusting threaded knob 37 is press-fitted with the outer frame 19. A second rotating plate 25 is provided inside the second hinge seat 16. A second movable shaft 26 is fixedly connected to the second rotating plate 25. The second rotating plate 25 is hinged to the second hinge seat 16 through the second movable shaft 26. A second positioning threaded knob 27 is threaded onto the circumferential side of one end of the second movable shaft 26. A directional rotating shaft 24 is provided on the lower surface of the second hinge seat 16. A storage rotating shaft 23 is provided on the upper surface of the second rotating plate 25. The storage rotating shaft 23 is inserted into the lower surface of the outer frame 19. The outer frame 19 is movably fitted with the second rotating plate 25 through the storage rotating shaft 23. The second hinge seat 16 is movably fitted with the lifting column 2 through the directional rotating shaft 24.

[0032] Specifically, the upper surface of the inner frame 20 is provided with a drafting board mounting groove 21, and the front surface of the inner frame 20 is fixedly mounted with an extension plate 33.

[0033] As can be seen from the above, this device, by setting up a column 1 and a lifting column 2, can adjust the exposed length of the lifting column 2 through the sliding cooperation between the lifting column 2 and the telescopic cavity 3. A second hinge seat 16 is set between the outer frame 19 and the lifting shaft 2. At the same time, a storage shaft 23 and a directional shaft 24 are respectively installed at both ends of the second hinge seat 16. The outer frame 19 can form a certain angle with the lifting column 2 through the second hinge seat 16, and can rotate in all directions through the storage shaft 23 and the directional shaft 24. An inner frame 20 with a main shaft 36 is installed on the outer frame 19. The inner frame 20 can rotate inside the outer frame 19 through the main shaft 36.

[0034] Example 2:

[0035] The folding mechanism includes a base plate 11, a column 1, and an outer frame 19. The base plate 11 and the outer frame 19 are located at opposite ends of the column 1. The base plate 11 is a rectangular plate structure, the column 1 is a cylindrical structure, and the outer frame 19 is a U-shaped plate structure. A first hinge seat 9 is provided between the base plate 11 and the column 1, and the column 1 is rotatably engaged with the base plate 11 through the first hinge seat 9. A lifting column 2 is provided at one end of the column 1, and a second hinge seat 16 is provided between the lifting column 2 and the outer frame 19, and the lifting column 2 is rotatably engaged with the outer frame 19 through the second hinge seat 16. The bearing mechanism includes an inner frame 20 provided on the outer frame plate 19. The inner frame 20 is a rectangular frame structure, and its two sides are in contact with the two inner sides of the outer frame 19. A main shaft 36 is fixedly connected to both ends of the inner frame 20, and the main shaft 36 passes through the outer frame 19. The inner frame 20 is rotatably engaged with the outer frame 19 through the main shaft 36.

[0036] See Figures 1-6As shown, a magnetic groove 34 and a magnetic block 17 are provided on one side of the outer frame 19. A drawing tool storage slot 38 is provided inside the magnetic groove 34, and the magnetic block 17 is magnetically engaged with the magnetic groove 34.

[0037] Specifically, one end of the magnetic block 17 is fixedly connected to the encapsulation block 18, and the encapsulation block 18 is fitted into the drawing tool storage slot 38.

[0038] Specifically, the column 1 has a telescopic cavity 3, the lifting column 2 is located in the telescopic cavity 3, the lifting column 2 slides with the column 1 through the telescopic cavity 3, the column 1 has a locking screw hole on its side, the locking screw hole is threaded with a locking screw 7, one end of the locking screw 7 is pressed with the lifting column 2.

[0039] Specifically, a first rotating plate 8 is fixedly connected to the lower surface of the column 1, and a first movable shaft 14 is fixedly connected to both sides of the first rotating plate 8. The first rotating plate 8 is hinged to the first hinge seat 9 through the first movable shaft 14. A first positioning threaded knob 15 is screwed to the circumferential side of the first movable shaft 14, and the first positioning threaded knob 15 is pressed into the first hinge seat 9.

[0040] Specifically, several inclined seats 10 are fixedly installed on the upper surface of the base plate 11. One surface of the inclined seat 10 is provided with a rod groove 13, and an anchor rod 12 is inserted into the rod groove 13.

[0041] As can be seen from the above, this device has a magnetic groove 34 and a drawing tool storage groove 38 on the side of the outer frame 19. The magnetic block 17 can attract the magnetic groove 34, and the encapsulation block 18 can seal the drawing tool storage groove 38.

[0042] Example 3:

[0043] See Figures 1-6 As shown, a connecting protrusion 22 is fixedly installed on one surface of the outer frame 19. There are two connecting protrusions 22. A connecting hole 35 is opened on one surface of the connecting protrusion 22, and the connecting hole 35 passes through the connecting protrusion 22.

[0044] Specifically, a crossbar 4 is fixedly installed on the column 1. A positioning hole 5 is opened on the front surface of the crossbar 4. The positioning hole 5 passes through the crossbar 4. The shape and position of the positioning hole 5 are adapted to the connecting protrusion 22. A positioning seat 6 is fixedly installed on the upper surface of the crossbar 4. An inner cavity 28 is opened inside the positioning seat 6. The inner cavity 28 is connected to the connecting hole 35. A compression spring 32 is fixedly connected inside the inner cavity 28. One end of the compression spring 32 is fixedly connected to a plug-in post 29. The plug-in post 29 slides with the inner cavity 28. A sliding groove 30 is opened on one side of the positioning seat 6. The sliding groove 30 is connected to the inner cavity 28. A sliding block 31 is installed inside the sliding groove 30. The sliding block 31 slides with the sliding groove 30. One end of the sliding block 31 is connected to the plug-in post 29.

[0045] As can be seen from the above, by setting a crossbar 4 with a positioning hole 5 and a connecting protrusion 22 with a connecting hole 35, the outer frame plate 20 can be flipped and folded to a state in contact with the crossbar 4 through the second hinge seat 16. At this time, the connecting protrusion 22 can be inserted into the positioning hole 5. Before insertion, the sliding block 31 can be moved to make the insertion post 29 retract into the inner cavity 28. After the connecting protrusion 22 is inserted into the positioning hole 5, the sliding block 31 is released. Under the action of the compression spring 32, the insertion post 29 can be inserted into the connecting hole 35.

[0046] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0047] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A support frame for civil engineering structural design, characterized in that, include: The folding mechanism includes a base plate (11), a column (1), and an outer frame (19). The base plate (11) and the outer frame (19) are located at opposite ends of the column (1). The base plate (11) is a rectangular plate structure, the column (1) is a cylindrical structure, and the outer frame (19) is a U-shaped plate structure. A first hinge seat (9) is provided between the base plate (11) and the column (1). The column (1) is rotatably connected to the base plate (11) through the first hinge seat (9). A lifting column (2) is provided at one end of the column (1). The lifting column (2) is connected to the outer frame (1). A second hinge seat (16) is provided between 9), and the lifting column (2) is rotatably engaged with the outer frame (19) through the second hinge seat (16); the bearing mechanism includes an inner frame (20) provided on the outer frame plate (19), the inner frame (20) is a rectangular frame structure, the two sides of the inner frame (20) are respectively in contact with the two sides inside the outer frame (19), and the two ends of the inner frame (20) are fixedly connected with a main shaft (36), the main shaft (36) passes through the outer frame (19), and the inner frame (20) is rotatably engaged with the outer frame (19) through the main shaft (36).

2. The support frame for civil engineering structural design according to claim 1, characterized in that: The main shaft (36) has a fastening threaded groove on one end of its circumferential side. An adjusting threaded knob (37) is screwed onto the fastening threaded groove. The adjusting threaded knob (37) is press-fitted with the outer frame (19). A second rotating plate (25) is provided inside the second hinge seat (16). A second movable shaft (26) is fixedly connected to the second rotating plate (25). The second rotating plate (25) is hinged to the second hinge seat (16) through the second movable shaft (26). One end of the circumferential side is threaded with a second positioning threaded knob (27), the lower surface of the second hinge seat (16) is provided with a directional rotating shaft (24), the upper surface of the second rotating plate (25) is provided with a storage rotating shaft (23), the storage rotating shaft (23) is inserted into the lower surface of the outer frame (19), the outer frame (19) is movably engaged with the second rotating plate (25) through the storage rotating shaft (23), and the second hinge seat (16) is movably engaged with the lifting column (2) through the directional rotating shaft (24).

3. The support frame for civil engineering structural design according to claim 1, characterized in that: The upper surface of the inner frame (20) is provided with a drawing board mounting groove (21), and the front surface of the inner frame (20) is fixedly installed with an extension plate (33).

4. A support frame for civil engineering structural design according to claim 1, characterized in that: The outer frame (19) has a magnetic groove (34) and a magnetic block (17) on one side. The magnetic groove (34) has a drawing tool storage slot (38) inside. The magnetic block (17) is magnetically engaged with the magnetic groove (34).

5. A support frame for civil engineering structural design according to claim 4, characterized in that: One end of the magnetic block (17) is fixedly connected to an encapsulation block (18), and the encapsulation block (18) is fitted into the drawing tool storage slot (38).

6. A support frame for civil engineering structural design according to claim 1, characterized in that: The column (1) has a telescopic cavity (3) and the lifting column (2) is located in the telescopic cavity (3). The lifting column (2) slides with the column (1) through the telescopic cavity (3). The column (1) has a locking screw hole on its circumferential side and a locking screw (7) is threaded into the locking screw hole. One end of the locking screw (7) is pressed against the lifting column (2).

7. A support frame for civil engineering structural design according to claim 1, characterized in that: The lower surface of the column (1) is fixedly connected to a first rotating plate (8). The first rotating plate (8) is fixedly connected to a first movable shaft (14) on both sides. The first rotating plate (8) is hinged to the first hinge seat (9) through the first movable shaft (14). The first movable shaft (14) is screwed to the circumferential side with a first positioning threaded knob (15). The first positioning threaded knob (15) is pressed into the first hinge seat (9).

8. A support frame for civil engineering structural design according to claim 1, characterized in that: A number of inclined seats (10) are fixedly installed on the upper surface of the base plate (11). One surface of the inclined seat (10) is provided with a rod groove (13), and an anchor rod (12) is inserted into the rod groove (13).

9. A support frame for civil engineering structural design according to claim 1, characterized in that: The outer frame (19) has a connecting protrusion (22) fixedly installed on one surface. There are two connecting protrusions (22). A connecting hole (35) is opened on one surface of the connecting protrusion (22). The connecting hole (35) passes through the connecting protrusion (22).

10. A support frame for civil engineering structural design according to claim 9, characterized in that: A crossbar (4) is fixedly installed on the column (1). A positioning hole (5) is provided on the front surface of the crossbar (4). The positioning hole (5) passes through the crossbar (4). The shape and position of the positioning hole (5) are adapted to the connecting protrusion (22). A positioning seat (6) is fixedly installed on the upper surface of the crossbar (4). An inner cavity (28) is provided inside the positioning seat (6). The inner cavity (28) is connected to the connecting hole (35). The inner cavity (28) is fixedly connected inside. There is a compression spring (32), one end of which is fixedly connected to a plug post (29). The plug post (29) is slidably engaged with the inner cavity (28). A sliding groove (30) is provided on one side of the positioning seat (6). The sliding groove (30) is connected to the inner cavity (28). A sliding block (31) is installed inside the sliding groove (30). The sliding block (31) is slidably engaged with the sliding groove (30). One end of the sliding block (31) is connected to the plug post (29).

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