Expansion cabin parking expansion device for semitrailer

Abstract

The utility model discloses an expansion cabin parking expansion device for a semitrailer, belongs to the technical field of semitrailers, and aims to solve the problems that the bottom surface of a clamping block is easy to wear, so that an expansion cabin inclines leftwards and rightwards, the normal use of the expansion cabin is influenced, and a gap between the clamping block and a clamping groove is enlarged, so that the expansion cabin is not easy to deform when the semitrailer runs. In order to solve the problems that in the prior art, an expansion cabin slightly swings left and right in the driving direction of the semitrailer in the semitrailer, and noise is generated in the semitrailer, the expansion cabin is arranged in the semitrailer, the two opposite side faces of the outer side wall of the expansion cabin are each provided with two clamping grooves, and the two opposite side faces of the inner side wall of the semitrailer are each fixedly provided with two clamping blocks; according to the utility model, the expansion cabin is prevented from inclining leftwards and rightwards to influence the normal use of the expansion cabin, meanwhile, the clamping block can be effectively limited, and the situation that the expansion cabin slightly swings leftwards and rightwards in the driving direction of the semitrailer in the semitrailer to generate noise due to the fact that a gap between the contact surfaces of the clamping block and the clamping groove is enlarged is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of semitrailer, concretely relates to an expansion seat cabin parking expansion device for semitrailer. BACKGROUND

[0002] The existing semitrailer has the problem of insufficient space when in use, and cannot meet the various space requirements of the driver's life, so a parking expansion device is added behind the semitrailer to increase the use space of the semitrailer.

[0003] The existing expansion seat cabin parking expansion device for semitrailer generally moves the expansion seat cabin and the head of the semitrailer by engaging the block and the groove, and moves the expansion seat cabin by the corresponding driving structure to achieve expansion. However, since the bottom surface of the engaging block is in contact and friction with the bottom surface of the engaging groove when moving, and the weights of the objects placed on both sides of the expansion seat cabin are inconsistent, the degree of wear of the bottom surfaces of the engaging blocks on both sides is obviously different after long-term use, so that the expansion seat cabin tilts left and right after expansion, affecting the normal use of the expansion seat cabin. At the same time, the contact surface of the engaging block and the engaging groove is also worn, and the gap between the contact surfaces of the engaging block and the engaging groove becomes larger over time. Since there is a gap between the expansion seat cabin and the head of the semitrailer, the expansion seat cabin will slightly swing left and right in the direction of travel of the semitrailer when the semitrailer is running, producing noise.

[0004] Therefore, there is a need for an expansion seat cabin parking expansion device for semitrailer to solve the problem of easy wear of the bottom surface of the engaging block, which causes the expansion seat cabin to tilt left and right, affecting the normal use of the expansion seat cabin, and the gap between the contact surfaces of the engaging block and the engaging groove becomes larger, causing the expansion seat cabin to slightly swing left and right in the direction of travel of the semitrailer when the semitrailer is running, producing noise. SUMMARY

[0005] The utility model aims to provide an expansion seat cabin parking expansion device for semitrailer to solve the problem raised in the background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an expansion seat cabin parking expansion device for semitrailer, comprising a semitrailer, the semitrailer is internally provided with an expansion seat cabin, two engaging grooves are respectively formed in the opposite sides of the outer side wall of the expansion seat cabin, two engaging blocks are respectively fixed on the opposite sides of the inner side wall of the semitrailer, the engaging blocks are movably engaged with the engaging grooves, side grooves are respectively formed in the opposite sides of the outer side wall of the expansion seat cabin, a first rack is fixed on the inner side wall bottom surface of the side groove, two first gears are respectively fixed on the opposite sides of the inner side wall of the semitrailer, and the first gears are engaged with the first rack.

[0007] It needs to be explained in the scheme that the bottom surface of the inside wall of the expansion cabin is fixed with two side frames on one side, the top and bottom of the side of the two side frames are respectively fixed with a bed plate, the top edge of the bed plate is fixed with a fence, the top of the side of the two side frames is respectively fixed with a C-shaped frame, and the two C-shaped frames are movably clamped with a table plate.

[0008] Further, it is worth mentioning that the side of the side frame is provided with a first limiting groove, the first limiting groove is movably clamped with a clamping strip, the side of the clamping strip is provided with a second limiting hole, the side of the inside wall of the second limiting hole is provided with a first limiting hole, the first limiting hole is movably clamped with a limiting column, one end of the limiting column is fixed with a moving rod, the moving rod passes through the first limiting hole and the second limiting hole, and one end of the moving rod is fixed with the side of the table plate.

[0009] Further, it is worth mentioning that the limiting column and the first limiting hole are respectively coated with a rubber coating.

[0010] As a preferred embodiment, the inside wall of the first limiting groove is provided with two second limiting grooves on opposite sides, the outer wall of the clamping strip is fixed with two positioning blocks on opposite sides, and the positioning blocks are movably clamped in the second limiting grooves.

[0011] As a preferred embodiment, the top of the fence is fixed with a first stop block at both ends, the top of the first stop block is fixed with a butt joint column, and the top of the table plate is fixed with two butt joint holes.

[0012] As a preferred embodiment, the first limiting groove is fixed with two second stop blocks inside.

[0013] As a preferred embodiment, the outer wall of the semitrailer is fixed with a rainproof cloth on one side, and the rainproof cloth wraps the expansion cabin.

[0014] As a preferred embodiment, the bottom surface of the inside wall of the semitrailer is provided with a second bottom groove on both sides, a first bottom groove is formed in the middle of the bottom surface of the inside wall of the semitrailer, a double-shaft motor is fixed to the bottom surface of the inside wall of the first bottom groove, the two output ends of the double-shaft motor are respectively connected to pass through the second bottom groove, the two output ends of the double-shaft motor are respectively fixed with a second gear, and the bottom surface of the expansion cabin is respectively fixed with a second rack.

[0015] Compared with the prior art, the expansion cabin parking expansion device for the semitrailer provided by the utility model has at least the following beneficial effects:

[0016] (1) Through the first gear and the first rack arranged, when the expansion cabin moves, the first gear can rotate through the first rack, which facilitates supporting the clamping block, and avoids the situation that when the clamping block and the clamping groove are used to limit the expansion cabin, the bottom surfaces of the two clamping blocks are abraded to different degrees, and the expansion cabin after expansion is inclined left and right during the driving of the semitrailer, the first gear and the first rack can limit the clamping block, and avoid that the side surface of the clamping block in contact with the clamping groove is abraded seriously, and the gap between the side surfaces is enlarged, and when the semitrailer drives on a bumpy road, the expansion cabin slightly swings left and right in the driving direction of the semitrailer in the semitrailer, through the meshing of the first gear and the first rack, the teeth of the first gear and the first rack can block the slight left and right swinging force, through the first gear and the first rack, the abrasion rate between the clamping block and the clamping groove can be reduced, so that the expansion cabin is prevented from being inclined left and right, and the normal use of the expansion cabin is affected, and meanwhile, the clamping block can be effectively limited, and the gap of the contact surface between the clamping block and the clamping groove is prevented from being enlarged, so that the expansion cabin slightly swings left and right in the driving direction of the semitrailer in the semitrailer, and noise is generated.

[0017] (2) Through the C-shaped frame arranged, the table plate can be limited, through the clamping strip, the limiting column and the moving rod arranged, when the table plate is moved out of the two C-shaped frames, the table plate can be supported by the two moving rods, through the first limiting groove and the clamping strip arranged, when the table plate is moved out of the two C-shaped frames, the table plate can be moved downward, through the first stopper arranged, one side of the bottom surface of the table plate can be supported, through the butt joint hole and the butt joint column arranged, the position of the table plate can be positioned, through the second stopper arranged, the clamping strip can be supported, so that the table plate can be conveniently folded and stored, and the space utilization rate of the expansion cabin is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a whole structure schematic view of the utility model;

[0019] Figure 2 It is a rain cloth structure schematic view of the utility model;

[0020] Figure 3 It is an expansion cabin structure schematic view of the utility model;

[0021] Figure 4 It is a first bottom groove structure schematic view of the utility model;

[0022] Figure 5 It is a clamping groove structure schematic view of the utility model;

[0023] Figure 6 It is a body side view structure schematic view of the utility model;

[0024] Figure 7 For this utility model Figure 6 A schematic diagram of the partially enlarged structure of the middle part;

[0025] Figure 8 This is a schematic diagram of the side frame structure of the utility model;

[0026] Figure 9 This is a schematic diagram of the second rack structure of the present utility model;

[0027] Figure 10 This is a schematic diagram of the bed board structure of the utility model;

[0028] Figure 11 This is a schematic diagram of the docking hole structure of the utility model;

[0029] Figure 12 For this utility model Figure 11 A schematic diagram of the partially enlarged structure of B in the middle;

[0030] Figure 13 This is a schematic diagram of the structure of the second stopper of the utility model;

[0031] Figure 14 This is a schematic diagram of the cross-sectional structure of the locking strip of the utility model.

[0032] In the picture:

[0033] 100, semi-trailer; 101, expanded cabin; 102, engaging groove; 103, engaging block; 104, side groove; 105, first rack; 106, first gear; 107, rainproof cloth;

[0034] 200, first bottom trough; 201, second bottom trough; 202, dual-axis motor; 203, second gear; 204, second rack;

[0035] 300, side frame; 301, bed board; 302, enclosure; 303, C-shaped frame; 304, table board; 305, docking hole;

[0036] 400, first stopper; 401, docking post; 402, second stopper;

[0037] 500, first limiting groove; 501, second limiting groove; 502, locking strip; 503, positioning block; 504, moving rod; 505, limiting column; 506, first limiting hole; 507, second limiting hole. DETAILED DESCRIPTION

[0038] See also Figures 1-14The utility model provides a kind of extension seat cabin parking expansion device for semitrailer, including semitrailer 100, the semitrailer 100 inside is provided with extension seat cabin 101, two clamping grooves 102 are respectively set in the opposite sides of the outer side wall of extension seat cabin 101, two clamping blocks 103 are respectively fixed on the opposite sides of the inner side wall of semitrailer 100, the clamping block 103 is movably clamped with the clamping groove 102, side groove 104 is respectively set in the opposite sides of the outer side wall of extension seat cabin 101, first rack 105 is fixed on the inner side wall bottom of side groove 104, two first gear 106 are respectively fixed on the opposite sides of the inner side wall of semitrailer 100, and the first gear 106 is engaged with the first rack 105.

[0039] Further as shown in Figure 10 The inner side wall bottom of extension seat cabin 101 is fixed with two side frames 300 on one side, the top and bottom of the side of the two side frames 300 close to each other are respectively fixed with bed plate 301, the top surface edge of bed plate 301 is fixed with fence 302, the top of the side of the two side frames 300 close to each other is respectively fixed with C-shaped frame 303, and table plate 304 is movably clamped between the two C-shaped frames 303.

[0040] By setting C-shaped frame 303, table plate 304 can be clamped between two C-shaped frames 303, so that table plate 304 is convenient to move out.

[0041] Further as shown in Figure 12 And Figure 14 The side of side frame 300 is provided with first limiting slot 500, clamping strip 502 is movably clamped in first limiting slot 500, second limiting hole 507 is formed in one side of clamping strip 502, first limiting hole 506 is formed in one side of the inner side wall of second limiting hole 507, limiting column 505 is movably clamped in first limiting hole 506, one end of limiting column 505 is fixed with moving rod 504, moving rod 504 passes through first limiting hole 506 and second limiting hole 507, and one end of moving rod 504 is fixed with one side of table plate 304.

[0042] By setting first limiting slot 500, clamping strip 502 can be clamped in first limiting slot 500, by setting limiting column 505 and moving rod 504, clamping strip 502 can be connected with table plate 304.

[0043] The scheme has the following working process: in the parked state of the semitrailer 100, when the expansion cabin 101 is stretched, the double-shaft motor 202 is started, the double-shaft motor 202 rotates to drive the two second gears 203 to rotate, the second gears 203 rotate to drive the second racks 204 to move, the second racks 204 move to make the expansion cabin 101 move out of the semitrailer 100, so that the use space of the semitrailer 100 is increased, the use space includes the space between the expansion cabin 101 and the seats of the semitrailer 100, and the space of the expansion cabin 101 itself, when the expansion cabin 101 moves, the first gear 106 rotates through the meshing with the first rack 105, so that the electrically expanded semitrailer 100 in the parked state is realized.

[0044] In the parked state of the semitrailer 100, when the table plate 304 is expanded, first pull the table plate 304, so that the table plate 304 moves out of the two C-shaped frames 303, during this process, the limiting column 505 and the moving rod 504 move with the table plate 304, then move the table plate 304 downward, so that the butt joint hole 305 is clamped on the corresponding butt joint column 401, at this time, the top surface of the first stop block 400 is in contact with the bottom surface of the table plate 304, and the top surface of the second stop block 402 is in contact with the bottom surface of the clamping strip 502, so that the table plate 304 can be moved out from below the top bed plate 301 and stretched, at this time, the table plate 304 is stably fixed, and the driver can cook or dine on the table plate 304. After use, move the table plate 304 upward, so that the butt joint hole 305 is separated from the butt joint column 401, and the moved table plate 304 corresponds to the two C-shaped frames 303, then push the table plate 304, so that the table plate 304 is clamped between the two C-shaped frames 303, because the rubber coating is arranged, when the table plate 304 is clamped between the two C-shaped frames 303, the friction between the rubber coatings can avoid the table plate 304 from moving out when the semitrailer 100 moves.

[0045] Before starting the vehicle, the double-shaft motor 202 is started, so that the double-shaft motor 202 reversely rotates, then drives the second gears 203 to reversely rotate and makes the second racks 204 reversely move, finally makes the expansion cabin 101 retract into the semitrailer 100.

[0046] According to the above working process can be known: by setting the first gear 106 and the first rack 105, so that the expansion cabin 101 moves, the first gear 106 can rotate through the first rack 105, which can support the clamping block 103, and avoid the use of the clamping block 103 and the clamping groove 102 to limit the expansion cabin 101, which can cause the clamping block 103 to be worn differently on both sides, causing the expansion cabin 101 to tilt left and right during the driving process of the semitrailer 100. The use of the first gear 106 and the first rack 105 can limit the clamping block 103, avoiding the clamping block 103 and the clamping groove 102 from being worn on the side, causing the gap between the clamping block 103 and the clamping groove 102 to increase, and causing the expansion cabin 101 to tilt slightly left and right during the driving process of the semitrailer 100. The first gear 106 and the first rack 105 can block the slight left and right tilting force through the meshing of the first gear 106 and the first rack 105. By setting the first gear 106 and the first rack 105, the wear rate between the clamping block 103 and the clamping groove 102 can be reduced, thereby avoiding the expansion cabin 101 from tilting left and right, affecting the normal use of the expansion cabin 101, and effectively limiting the clamping block 103, avoiding the gap between the clamping block 103 and the clamping groove 102 from increasing, causing the expansion cabin 101 to tilt slightly left and right during the driving process of the semitrailer, and producing noise.

[0047] By setting the C-shaped frame 303, the table plate 304 can be limited. By setting the clamping strip 502, the limiting column 505 and the moving rod 504, when the table plate 304 is removed from the two C-shaped frames 303, the table plate 304 can be supported by the two moving rods 504. By setting the first limiting groove 500 and the clamping strip 502, when the table plate 304 is removed from the two C-shaped frames 303, it can be moved downward. By setting the first stop block 400, the bottom side of the table plate 304 can be supported. By setting the butt joint hole 305 and the butt joint column 401, the position of the table plate 304 can be positioned. By setting the second stop block 402, the clamping strip 502 can be supported, so that the table plate 304 can be easily folded and stored, improving the space utilization of the expansion cabin 101.

[0048] Further as shown in Figure 14 The outer side wall of the limiting column 505 and the inner side wall of the first limiting hole 506 are respectively coated with a rubber coating.

[0049] The rubber coating is provided to increase the friction between the limiting column 505 and the first limiting hole 506 , thereby preventing the table top 304 from moving out of the two C-shaped frames 303 when the semi-trailer 100 moves.

[0050] Further as Figure 12 As shown, two second limiting grooves 501 are respectively provided on the two opposite side surfaces of the inner wall of the first limiting groove 500, and two positioning blocks 503 are respectively fixed on the two opposite side surfaces of the outer wall of the locking strip 502, and the positioning blocks 503 are correspondingly and movably engaged in the second limiting groove 501.

[0051] The position of the engaging strip 502 can be further limited by the second limiting groove 501 and the positioning block 503 .

[0052] Further as Figure 11 As shown, first blocks 400 are fixed at both ends of the top of the bottom enclosure 302, a docking column 401 is fixed on the top surface of the first block 400, and two docking holes 305 are fixed on one side of the top surface of the table top 304.

[0053] By setting the first stop block 400, after the table top 304 is unfolded, the first stop block 400 can support one side of the bottom surface of the table top 304. By setting the docking column 401 and the docking hole 305, after the table top 304 is unfolded, the docking column 401 can engage with the docking hole 305, thereby further positioning the table top 304.

[0054] Further as Figure 13 As shown, two second stoppers 402 are fixed inside the first limiting groove 500 .

[0055] By providing the second stopper 402 , after the table top 304 is unfolded, the locking strip 502 can contact the second stopper 402 , thereby supporting the locking strip 502 .

[0056] Further as Figure 2 As shown, a rainproof cloth 107 is fixed to one side of the outer wall of the semi-trailer 100, and the rainproof cloth 107 wraps the expanded cabin 101.

[0057] By providing the rainproof cloth 107 , the expanded cabin 101 can be wrapped by the rainproof cloth 107 , thereby preventing rainwater from entering the semi-trailer 100 .

[0058] in, Figure 2 The tarpaulin 107 is shown in a folded state. When the expansion cabin 101 is unfolded from the semi-trailer 100 , the folded tarpaulin 107 is unfolded along with the expansion cabin 101 .

[0059] Further as Figure 4 andFigure 9 As shown, the second bottom groove 201 is arranged on both sides of the bottom surface of the inner side wall of the semitrailer 100, the first bottom groove 200 is arranged on the middle of the bottom surface of the inner side wall of the semitrailer 100, the double-shaft motor 202 is fixed on the bottom surface of the inner side wall of the first bottom groove 200, the two output ends of the double-shaft motor 202 are respectively connected through the second bottom groove 201, the second gear 203 is fixed on the two output ends of the double-shaft motor 202, the second rack 204 is fixed on both sides of the bottom surface of the expanded cabin 101, the second rack 204 is located in the second bottom groove 201, and the second gear 203 is engaged with the second rack 204.

[0060] The double-shaft motor 202, the second gear 203 and the second rack 204 are arranged, so that the expanded cabin 101 can move.

[0061] In summary, when the expanded cabin 101 is stretched in the parking state of the semitrailer 100, the double-shaft motor 202 is started, the double-shaft motor 202 rotates to drive the two second gears 203 to rotate, the second gears 203 rotate to drive the second rack 204 to move, the second rack 204 moves to make the expanded cabin 101 move out of the semitrailer 100, so that the use space of the semitrailer 100 is increased, the use space includes the space between the expanded cabin 101 and the seat of the semitrailer 100 and the space of the expanded cabin 101 itself, and when the expanded cabin 101 moves, the first gear 106 rotates through the engagement with the first rack 105, so that the semitrailer 100 is expanded in the parking state.

[0062] When the table plate 304 is unfolded in the parking state of the semitrailer 100, the table plate 304 is first pulled out of the two C-shaped frames 303, in this process, the limiting column 505 and the moving rod 504 move with the table plate 304, then the table plate 304 is moved downward, so that the connecting hole 305 is clamped on the corresponding connecting column 401, at this time, the top surface of the first stop block 400 is in contact with the bottom surface of the table plate 304, and the top surface of the second stop block 402 is in contact with the bottom surface of the clamping strip 502, so that the table plate 304 can be moved out from below the bed plate 301 at the top and unfolded, at this time, the table plate 304 is stably fixed, and the driver can cook or have a meal on the table plate 304. After use, the table plate 304 is moved upward, so that the connecting hole 305 is separated from the connecting column 401, and the table plate 304 after moving upward corresponds to the two C-shaped frames 303, then the table plate 304 is pushed, so that the table plate 304 is clamped between the two C-shaped frames 303, and because the rubber coating is arranged, the friction between the rubber coatings can avoid the table plate 304 from moving out when the semitrailer 100 moves.

[0063] Before starting the vehicle, the double-shaft motor 202 is started to rotate reversely, so as to drive the second gear 203 to rotate reversely and the second rack 204 to move reversely, and finally the extended cabin 101 is retracted into the semitrailer 100.

[0064] The double-shaft motor 202 can be purchased in the market, which is a mature technology in the field and has been fully disclosed, so the description is not repeated here.

[0065] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An extended cab park extension device for a semi-trailer, comprising a semi-trailer (100), characterized in that, The semi-trailer (100) is internally provided with an expansion cabin (101), two clamping grooves (102) are respectively formed in opposite sides of the outer side wall of the expansion cabin (101), two clamping blocks (103) are respectively fixed on opposite sides of the inner side wall of the semi-trailer (100), the clamping blocks (103) are movably clamped in the clamping grooves (102) correspondingly, side grooves (104) are respectively formed in the middle of opposite sides of the outer side wall of the expansion cabin (101), a first rack (105) is fixed on the inner side wall bottom surface of the side groove (104), and two first gears (106) are respectively fixed on opposite sides of the inner side wall of the semi-trailer (100).

2. An extended cab parking expansion device for a semi-trailer according to claim 1, characterized in that: The inner side wall bottom surface of the expansion cabin (101) is fixed with two side frames (300), a bed plate (301) is respectively fixed on the top and bottom of one side of the two side frames (300) close to each other, a fence (302) is fixed on the top surface edge of the bed plate (301), C-shaped frames (303) are respectively fixed on the top of one side of the two side frames (300) close to each other, and a table plate (304) is movably clamped between the two C-shaped frames (303).

3. An extended cab parker expander device for a semi-trailer as defined in claim 2, characterized in that: A first limiting groove (500) is formed in one side of the side frame (300), a clamping strip (502) is movably clamped in the first limiting groove (500), a second limiting hole (507) is formed in one side of the clamping strip (502), a first limiting hole (506) is formed in one side of the inner side wall of the second limiting hole (507), a limiting column (505) is movably clamped in the first limiting hole (506), one end of the limiting column (505) is fixed with a moving rod (504), the moving rod (504) penetrates through the first limiting hole (506) and the second limiting hole (507), and one end of the moving rod (504) is fixed with the table plate (304) on one side.

4. An extended cab parker expander device for a semi-trailer as defined in claim 3, characterized in that: The outer side wall of the limiting column (505) and the inner side wall of the first limiting hole (506) are respectively coated with a rubber coating.

5. An extended cab parker extension device for a semi-trailer as claimed in claim 4, characterized in that: Two second limiting grooves (501) are respectively formed in opposite sides of the inner side wall of the first limiting groove (500), two positioning blocks (503) are respectively fixed on opposite sides of the outer side wall of the clamping strip (502), and the positioning blocks (503) are movably clamped in the second limiting grooves (501) correspondingly.

6. An extended cab parker extension device for a semi-trailer as claimed in claim 5, characterised in that: First stop blocks (400) are respectively fixed at both ends of the top of the fence (302), a butt joint column (401) is fixed on the top surface of the first stop block (400), and two butt joint holes (305) are fixed on one side of the top surface of the table plate (304).

7. An extended cab parker extension device for a semi-trailer as claimed in claim 6, characterized in that: Two second stop blocks (402) are fixed in the first limiting groove (500).

8. An extended cab parker extension device for a semi-trailer as claimed in claim 7, characterized in that: A rainproof cloth (107) is fixed on one side of the outer side wall of the semi-trailer (100), and the rainproof cloth (107) wraps the expansion cabin (101).

9. An extended cab parker extension device for a semi-trailer as claimed in claim 8, characterized in that: The second bottom groove (201) is arranged on both sides of the inner side wall bottom surface of the semitrailer (100), the first bottom groove (200) is arranged on the middle of the inner side wall bottom surface of the semitrailer (100), the double-shaft motor (202) is fixed on the inner side wall bottom surface of the first bottom groove (200), the two output ends of the double-shaft motor (202) are respectively connected through the second bottom groove (201), the second gear (203) is fixed on the two output ends of the double-shaft motor (202) respectively, the second rack (204) is fixed on both sides of the bottom surface of the expanded cabin (101) respectively, the second rack (204) is located in the second bottom groove (201), and the second gear (203) is engaged with the second rack (204) correspondingly.

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