A gear box and method of use thereof

Abstract

The application relates to a gear box and a use method thereof, and relates to the technical field of transmission equipment. In order to solve the problem that the number and position of gears inside the gear box are relatively fixed, the transmission stage number of the gear box is fixed, and the adjustability of the gear box is low, the gear box comprises a box body and a base, the box body is connected to the top wall of the base; the box body comprises a first shell and a second shell, the base comprises a first base plate for connecting the first shell and a second base plate for connecting the second shell, main gears are rotationally connected in the first shell and the second shell; a lengthening plate is arranged between the first base plate and the second base plate, a connecting shell is arranged on the lengthening plate, the connecting shell is located between the first shell and the second shell, a secondary gear is rotationally connected in the connecting shell, and the secondary gear is engaged with the main gears; plug-in plates are arranged at the two ends of the lengthening plate, plug-in grooves are formed in the ends of the first base plate and the second base plate; and the lengthening plate is detachably connected with the first base plate and the second base plate. The application has the effect of improving the adjustability of the gear box.

Description

Technical Field

[0001] This application relates to the field of transmission equipment technology, and in particular to a gearbox and its usage method. Background Technology

[0002] Gearboxes are common transmission devices in the field of mechanical equipment, which can adjust the output speed of the drive motor according to the needs of the machine.

[0003] The gearbox in the related technology includes a housing with several gears of different sizes rotatably connected inside, and adjacent gears meshing with each other. Two rotating shafts are rotatably connected to the outer side walls of both sides of the housing. The two drive shafts pass through the side walls of the housing and are respectively connected to the corresponding gears inside the housing. The drive shafts are coaxial with the connected gears. In use, one rotating shaft is connected to the output of the drive motor, and the other rotating shaft is connected to the rotating shaft of the machine to be driven. After the drive motor is started, it drives the drive shaft connected to the drive motor, which drives the gears inside the housing to mesh and rotate. Because the gears inside the housing have different sizes and numbers of teeth, the output speed of the rotating shaft connected to the machine to be driven will change, thereby realizing the adjustment of the speed of the drive motor.

[0004] Regarding the aforementioned technologies, the inventors believe that once the gearbox is manufactured, the number and position of its internal gears are relatively fixed, resulting in a fixed number of transmission stages and low adjustability of the gearbox. Summary of the Invention

[0005] To improve the adjustability of a gearbox, this application provides a gearbox and a method of using it.

[0006] The gearbox and its usage method provided in this application adopt the following technical solution:

[0007] A gearbox includes a housing and a base, the housing being connected to the top wall of the base; the housing includes a first shell and a second shell, the base includes a first base plate for connecting to the first shell and a second base plate for connecting to the second shell, both the first and second shells having a main gear rotatably connected therein; an extension plate is provided between the first and second base plates, the extension plate having a connecting shell located between the first and second shells, the connecting shell having a secondary gear rotatably connected therein, the secondary gear meshing with the main gear; insertion plates are provided on the end walls on both sides of the extension plate, and insertion slots for inserting the insertion plates are formed on the end walls of the first and second base plates; the extension plate is detachably connected to the first and second base plates.

[0008] By adopting the above technical solution, when the speed of the gearbox needs to be adjusted, the first base plate and the second base plate are moved away from each other, and the extension plate is moved between the first base plate and the second base plate. At the same time, the extension plate drives the connecting shell to move between the first shell and the second shell. Then, the first base plate and the second base plate are moved towards each other, so that the plug-in plate is inserted into the plug-in slot. At the same time, the secondary gear in the connecting shell meshes with the main gear in the first shell and the second shell. Finally, the extension plate is connected to the first base plate and the second base plate. The plug-in slot and the plug-in plate cooperate to guide the connection between the extension plate and the first base plate and the second base plate. The detachable connection between the first shell and the second shell, the detachable connection between the first base plate and the second base plate, and the setting of the extension plate, the connecting shell, and the secondary gear make the number of gears in the gearbox adjustable, and further make the transmission stage of the gearbox adjustable, thereby improving the adjustability of the gearbox.

[0009] Preferably, the extended plate is provided with connecting blocks on both sides, and the connecting blocks are semi-cylindrical; the first substrate and the second substrate are provided with splicing blocks that are attached to the connecting blocks, and the splicing blocks are semi-cylindrical; the connecting blocks and the splicing blocks are fitted with the same connecting sleeve.

[0010] By adopting the above technical solution, after the plug-in plate is inserted into the plug-in slot, the connecting blocks are respectively attached to the corresponding splicing blocks. Then, several connecting sleeves are moved and respectively fitted onto one pair of connecting blocks and splicing blocks. The inner sidewall of the connecting sleeve limits the relative position of the connecting blocks and splicing blocks, thereby realizing the connection between the extension plate and the first substrate and the second substrate. The cooperation of the connecting blocks, splicing blocks and connecting sleeves improves the speed of connecting the extension plate to the first substrate and the second substrate.

[0011] Preferably, the lower end of the connecting sleeve is provided with a limiting block, the side walls of the connecting block and the splicing block are provided with a sliding groove for the limiting block to pass through, and the side walls at the lower end of the connecting block and the splicing block are provided with an arc-shaped groove for the limiting block to be inserted, and the inner side wall of the arc-shaped groove is in contact with the side wall of the limiting block.

[0012] By adopting the above technical solution, after the connecting sleeve is fitted onto the connecting block and the splicing block, the connecting sleeve simultaneously drives the limiting block to pass through the slide groove and insert into the arc groove. Rotating the connecting sleeve causes the limiting block to be further inserted into the arc groove and away from the slide groove. The inner sidewall of the arc groove can limit the limiting block, reducing the situation where the limiting block comes out of the slide groove and causes the connecting sleeve to detach from the connecting block and the splicing block.

[0013] Preferably, the top wall of the inner sidewall of the arc-shaped groove is provided with a slot, a limiting rod is inserted into the slot, and a spring is connected between the limiting rod and the bottom wall of the slot; an arc-shaped head is provided at the end of the limiting rod away from the spring, and the arc-shaped head extends out of the slot.

[0014] By adopting the above technical solution, when the limiting block moves in the arc-shaped groove, the limiting block will contact the side wall of the arc-shaped head. Under the guidance of the arc-shaped head, the limiting block pushes the limiting rod into the slot and compresses the spring. After the limiting block passes the position of the limiting rod, the elastic force of the spring returning to its original state causes the limiting rod to reset. At this time, the limiting block is located between the limiting rod and the inner side wall of the arc-shaped groove, and the arc-shaped head can limit the position of the limiting block in the arc-shaped groove.

[0015] Preferably, the first substrate has a rack near the end wall of the second substrate, and the rack is inserted into the second substrate; the top wall of the second substrate has a toothed disc, one side of which passes through the top wall of the second substrate and meshes with the rack; a mounting plate is provided on one side of the second substrate, and a driving member for driving the toothed disc to rotate is provided on the mounting plate.

[0016] By adopting the above technical solution, when the first substrate and the second substrate need to move towards each other or separate, the driving component can be activated to drive the gear disk to rotate. The gear disk drives the meshing rack to move, which in turn drives the first substrate to move, so as to realize the movement of the first substrate and the second substrate towards each other or separate. This reduces the need for operators to manually pull the first substrate and the second substrate, and improves the convenience of operation.

[0017] Preferably, the bottom walls of the first substrate and the second substrate are provided with rollers, and each of the first substrate and the second substrate has a mounting groove for mounting the rollers. The mounting grooves are respectively connected to the top wall, bottom wall and side wall of the corresponding first substrate and the second substrate. The roller includes a wheel body and a mounting part. The wheel body is rotatably connected to the mounting part, and the mounting part is rotatably connected to the inner side wall of the mounting groove. The top walls of the first substrate and the second substrate are provided with positioning components for positioning the mounting part, and the mounting grooves are provided with limiting members for limiting the mounting part.

[0018] By adopting the above technical solution, when the gearbox is working, the roller is completely located in the mounting groove, and the positioning component positions the mounting part, thereby positioning the roller. Before moving the first substrate, the positioning component is removed from the roller, the gearbox is lifted and the mounting part of the roller is rotated, so that the wheel rotates to one side of the bottom wall of the first substrate and the second substrate. Then, the limiting component is used to limit the mounting part, reducing the accidental rotation of the wheel caused by the mounting part. When the first substrate and the second substrate move towards each other or separate, the wheel rolls relative to the working platform, which can reduce the friction between the first substrate and the second substrate and the working platform.

[0019] Preferably, each positioning component includes a positioning rod, a positioning sleeve, an elastic element, and a baffle. A plurality of positioning sleeves are fixedly installed on the top walls of corresponding first and second substrates. The baffle is located at one end of the positioning sleeve. The positioning rod is inserted into and passes through the positioning sleeve. The elastic element is located between the baffle and the positioning rod. The end of the positioning rod away from the elastic element extends from above the mounting groove. The side of the positioning rod near the mounting part is provided with a sloping wall. The side of the mounting part near the positioning rod is provided with a positioning buckle for the positioning rod to be inserted.

[0020] By adopting the above technical solution, after the first substrate and the second substrate are moved, the limiting member on the mounting part is removed, and the mounting part of the roller is rotated to drive the wheel into the mounting groove. During the rotation of the mounting part, the positioning buckle will abut against the inclined wall. Under the guidance of the inclined wall, the positioning buckle will push the positioning rod to move closer to the elastic member and compress the elastic member. After the positioning buckle moves past the position of the positioning rod, the elastic force of the elastic member returning to its original state will push the positioning rod through the positioning buckle to position the roller in the mounting groove. The cooperation of the positioning rod, positioning sleeve, elastic member and baffle improves the speed of positioning the roller by the positioning assembly.

[0021] Preferably, the limiting member includes a limiting plate, and the mounting plate has a limiting groove on the side away from the wheel body. The inner sidewall of the mounting groove has a mating groove that communicates with the top wall of the corresponding first base plate and second base plate. The limiting plate can be inserted into the limiting groove and the mating groove.

[0022] By adopting the above technical solution, when the wheel rotates to one side of the bottom wall of the first and second base plates, the limiting groove aligns with the mating groove. The movable limiting plate is inserted into the limiting groove and the mating groove. The inner side wall of the mating groove limits the limiting plate, and the limiting plate limits the limiting groove, thereby limiting the mounting part and further limiting the roller. The cooperation of the limiting plate, the limiting groove, and the mating groove improves the speed of limiting the roller.

[0023] A method of using a gearbox: Move the positioning rod to remove the positioning rod's limitation on the positioning buckle, lift the gearbox and rotate the mounting part of the roller, so that the wheel rotates to one side of the bottom wall of the first base plate and the second base plate, and move the limiting plate into the limiting groove and the mating groove;

[0024] The drive unit is activated to rotate the gear disk, which in turn moves the meshing rack, causing the first substrate to move away from the second substrate. After the first substrate has moved to the appropriate position, the drive unit is turned off.

[0025] The extension plate is moved between the first substrate and the second substrate, and the driving component is driven to move the first substrate closer to the second substrate, so that the plug-in plate is inserted into the plug-in slot; at the same time, all connecting blocks and corresponding splicing blocks are aligned.

[0026] The movable connecting sleeve is inserted and fitted onto the connecting block and the splicing block, while simultaneously driving the limiting block to pass through the slide groove and insert into the arc groove. Rotating the connecting sleeve drives the limiting block to move along the length of the arc groove. The limiting block contacts the arc head and pushes the limiting rod into the slot, so that the position of the limiting block beyond the limiting rod is between the limiting rod and the inner wall of the arc groove.

[0027] Remove the limiting plate from the limiting groove and the mating groove. Rotate the mounting part of the roller to drive the wheel body into the mounting groove. The mounting part drives the positioning buckle to abut against the inclined wall and pushes the positioning rod to move closer to the baffle. After the positioning buckle moves past the position of the positioning rod, the elastic element pushes the positioning rod through the positioning buckle to position the roller in the mounting groove.

[0028] By adopting the above technical solution

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. The detachable connection between the first housing and the second housing, the detachable connection between the first base plate and the second base plate, and the arrangement of the extension plate, the connecting shell and the auxiliary gear, make the number of gears in the gearbox adjustable, and further make the transmission stage of the gearbox adjustable, thereby improving the adjustability of the gearbox.

[0031] 2. The combination of connecting blocks, splicing blocks, and connecting sleeves improves the speed of connecting the extended plate to the first substrate and the second substrate.

[0032] 3. The combination of rack, gear plate and drive unit reduces the need for operators to manually pull the first and second base plates, improving the convenience of operation. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a gearbox in an embodiment of this application.

[0034] Figure 2 This is a cross-sectional schematic diagram used in the embodiments of this application to illustrate the positional relationship between the plug slot and the plug plate.

[0035] Figure 3 This is a cross-sectional schematic diagram used in the embodiments of this application to illustrate the positional relationship between the spring and the limiting rod.

[0036] Figure 4 This is a structural schematic diagram in the embodiments of this application used to illustrate the positional relationship between the limiting groove and the mating groove.

[0037] Figure 5 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0038] Figure 6 yes Figure 4 Enlarged diagram of part B

[0039] Explanation of reference numerals in the attached drawings: 1. First housing; 11. Second housing; 12. Main gear; 2. First base plate; 21. Second base plate; 211. Gear disc; 212. Driving component; 22. Insertion groove; 23. Splicing block; 231. Slide groove; 232. Arc groove; 233. Slot; 234. Limiting rod; 235. Spring; 236. Arc head; 24. Rack; 25. Mounting groove; 251. Mating groove; 3. Extension plate; 31. Insertion plate; 32. Connecting shell; 321. Secondary gear; 33. Connecting block; 4. Connecting sleeve; 41. Limiting block; 5. Roller; 51. Wheel body; 52. Mounting part; 521. Positioning buckle; 522. Limiting groove; 6. Positioning assembly; 61. Positioning rod; 611. Sloping wall; 62. Positioning sleeve; 63. Elastic component; 64. Baffle; 7. Limiting plate. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0041] This application discloses a gearbox. (Refer to...) Figure 1 and Figure 2 The gearbox includes a housing and a base. The housing is bolted to the top wall of the base. The housing includes a first shell 1 and a second shell 11. The base includes a first base plate 2 and a second base plate 21. A main gear 12 is rotatably connected to both the first shell 1 and the second shell 11 via bearings. An extension plate 3 is connected between the first base plate 2 and the second base plate 21. A connecting shell 32 is bolted to the top wall of the extension plate 3. The connecting shell 32 is located between the first shell 1 and the second shell 11 and is attached to the end walls of the first shell 1 and the second shell 11. A secondary gear 321 is rotatably connected to the connecting shell 32 via bearings. The secondary gear 321 meshes with the main gear 12 in the first shell 1 and the second shell 11.

[0042] Reference Figure 1 ,and Figure 3 The end walls on both sides of the extension plate 3 are integrally formed with plug-in plates 31. The end walls of the first substrate 2 and the second substrate 21 are provided with plug-in grooves 22, and the two plug-in plates 31 are respectively inserted into one of the plug-in grooves 22. The top walls on both sides of the extension plate 3 are welded with connecting blocks 33, and the top walls of the first substrate 2 and the second substrate 21 are welded with splicing blocks 23. Both the connecting blocks 33 and the splicing blocks 23 are semi-cylindrical. The splicing blocks 23 are attached to the connecting blocks 33, and the outer walls of the connecting blocks 33 and the splicing blocks 23 are fitted with the same connecting sleeve 4.

[0043] When the speed of the gearbox needs to be adjusted, the first base plate 2 and the second base plate 21 are moved away from each other, and the extension plate 3 is moved between the first base plate 2 and the second base plate 21. At the same time, the extension plate 3 drives the connecting shell 32 to move between the first shell 1 and the second shell 11. Then the first base plate 2 and the second base plate 21 are moved towards each other, so that the plug plate 31 is inserted into the plug slot 22. At the same time, the secondary gear 321 in the connecting shell 32 meshes with the main gear 12 in the first shell 1 and the second shell 11. At this time, the connecting block 33 is attached to the corresponding splicing block 23. Then, several connecting sleeves 4 are moved and respectively fitted onto one pair of connecting blocks 33 and splicing blocks 23, so that the connection between the extension plate 3 and the first base plate 2 and the second base plate 21 can be realized.

[0044] Reference Figure 3 The lower end wall of the connecting sleeve 4 is connected to the limiting block 41 by welding. The side walls of the connecting block 33 and the splicing block 23 are provided with a sliding groove 231. The side walls at the lower end of the connecting block 33 and the splicing block 23 are provided with an arc groove 232. The top wall of the inner side wall of the arc groove 232 is provided with a slot 233. A limiting rod 234 is inserted into the slot 233. A spring 235 is glued between the limiting rod 234 and the bottom wall of the slot 233. An arc head 236 is provided at the end of the limiting rod 234 away from the spring 235.

[0045] After the connecting sleeve 4 is fitted onto the connecting block 33 and the splicing block 23, the connecting sleeve 4 simultaneously drives the limiting block 41 to pass through the sliding groove 231 and insert into the arc groove 232. Rotating the connecting sleeve 4 causes the limiting block 41 to move towards the arc head 236 within the arc groove 232. After the limiting block 41 contacts the side wall of the arc head 236, it will push the limiting rod 234 into the slot 233 and compress the spring 235 under the guidance of the arc head 236. After the limiting block 41 passes the position of the limiting rod 234, the elastic force of the spring 235 to return to its original state causes the limiting rod 234 to reset. At this time, the limiting block 41 is located between the limiting rod 234 and the inner side wall of the arc groove 232. The inner wall of the arc groove 232 can limit the position of the limiting block 41, reducing the possibility that the limiting block 41 will come out of the groove 231 and cause the connecting sleeve 4 to detach from the connecting block 33 and the splicing block 23; the cooperation of the limiting rod 234, the arc head 236 and the spring 235 can limit the position of the limiting block 41 in the arc groove 232.

[0046] Reference Figure 1A rack 24 is welded to the end wall of the first substrate 2 near the second substrate 21. The end of the rack 24 away from the first substrate 2 is inserted into the second substrate 21. A mounting plate is welded to one side of the second substrate 21. A drive unit 212, which is a motor, is connected to the top wall of the mounting plate by screws. A gear disk 211 is connected to the drive shaft of the drive unit 212 by a keyway. One side of the gear disk 211 passes through the top wall of the second substrate 21 and meshes with the rack 24. When it is necessary to move the first substrate 2 and the second substrate 21 toward each other or away from each other, the drive unit 212 can be activated to drive the gear disk 211 to rotate, which will drive the meshing rack 24 to move, and further drive the first substrate 2 to move, so as to realize the movement of the first substrate 2 and the second substrate 21 toward each other or away from each other, thus improving the convenience of operation.

[0047] Reference Figure 1 , Figure 5 and Figure 6 Mounting grooves 25 are provided on the first substrate 2 and the second substrate 21. The mounting grooves 25 are respectively connected to the top wall, bottom wall and side wall of the corresponding first substrate 2 and the second substrate 21. A roller 5 is rotatably connected to the inner side wall of the mounting groove 25 by a pin. The roller 5 includes a wheel body 51 and a mounting part 52. The wheel body 51 is rotatably connected to the mounting part 52, and the mounting part 52 is rotatably connected to the inner side wall of the mounting groove 25. A positioning component 6 for positioning the mounting part 52 is provided on the top wall of the first substrate 2 and the second substrate 21. A limiting member for limiting the mounting part 52 is provided in the mounting groove 25.

[0048] Reference Figure 5 Each positioning component 6 includes a positioning rod 61, a positioning sleeve 62, an elastic element 63, and a baffle 64. Several positioning sleeves 62 are welded to the top walls of the corresponding first substrate 2 and second substrate 21. The baffle 64 is located at one end of the positioning sleeve 62 and is welded to the top walls of the corresponding first substrate 2 and second substrate 21. The positioning rod 61 is inserted into and passes through the positioning sleeve 62. The elastic element 63 is glued between the baffle 64 and the positioning rod 61. The positioning rod 61 has a sloping wall 611 on the side near the mounting part 52. The mounting part 52 has a positioning buckle 521 welded to the side near the positioning rod 61. The positioning rod 61 passes through the positioning buckle 521 and positions the inner wall of the positioning buckle 521, thereby positioning the mounting part 52 and fixing the position of the roller 5 in the mounting groove 25.

[0049] Reference Figure 1 and Figure 6 The limiting component includes a limiting plate 7. A limiting groove 522 is provided on the side of the mounting part 52 away from the wheel body 51. A mating groove 251 is provided on the inner side wall of the mounting groove 25. The mating groove 251 communicates with the top wall of the corresponding first substrate 2 and second substrate 21. The limiting plate 7 can be inserted into the limiting groove 522 and the mating groove 251.

[0050] Before moving the first substrate 2, the positioning rod 61 is moved to remove the positioning of the positioning buckle 521. The gearbox is lifted and the mounting part 52 of the roller 5 is rotated, causing the wheel 51 to rotate to the bottom wall side of the first substrate 2 and the second substrate 21. The moving limiting plate 7 is inserted into the limiting groove 522 and the mating groove 251. The inner side wall of the mating groove 251 limits the limiting plate 7, and the limiting plate 7 limits the limiting groove 522, thereby limiting the mounting part 52 and reducing the accidental rotation of the wheel 51 caused by the mounting part 52. When the first substrate 2 and the second substrate 21 move towards each other or move away from each other, the wheel 51 can reduce the friction between the first substrate 2 and the second substrate 21 and the working platform.

[0051] After the first substrate 2 and the second substrate 21 are moved, the limiting plate 7 is removed from the limiting groove 522 and the mating groove 251. The mounting part 52 of the roller 5 is rotated to drive the wheel body 51 into the mounting groove 25. During the rotation of the mounting part 52, the positioning buckle 521 will abut against the inclined wall 611. Under the guidance of the inclined wall 611, the positioning buckle 521 will push the positioning rod 61 to move closer to the elastic member 63 and compress the elastic member 63. After the positioning buckle 521 moves past the position of the positioning rod 61, the elastic force of the elastic member 63 to restore its original state will push the positioning rod 61 through the positioning buckle 521 to position the roller 5 in the mounting groove 25.

[0052] A method of using a gearbox: Move the positioning rod 61 to remove the positioning rod 61 from the positioning buckle 521, lift the gearbox and rotate the mounting part 52 of the roller 5, so that the wheel body 51 rotates to one side of the bottom wall of the first base plate 2 and the second base plate 21, and move the limiting plate 7 into the limiting groove 522 and the mating groove 251.

[0053] The start drive unit 212 drives the toothed disk 211 to rotate, which in turn drives the meshing rack 24 to move, causing the first substrate 2 to move away from the second substrate 21. After the first substrate 2 moves to the appropriate position, the drive unit 212 is turned off.

[0054] Move the extension plate 3 between the first substrate 2 and the second substrate 21, activate the drive unit 212 to move the first substrate 2 closer to the second substrate 21, and insert the plug plate 31 into the plug slot 22; at the same time, all connecting blocks 33 and corresponding splicing blocks 23 are aligned.

[0055] The movable connecting sleeve 4 is inserted and fitted onto the connecting block 33 and the splicing block 23, while simultaneously driving the limiting block 41 to pass through the sliding groove 231 and insert into the arc groove 232. Rotating the connecting sleeve 4 causes the limiting block 41 to move along the length direction of the arc groove 232. The limiting block 41 contacts the arc head 236 and pushes the limiting rod 234 into the slot 233, so that the limiting block 41 passes the limiting rod 234 and is located between the limiting rod 234 and the inner wall of the arc groove 232.

[0056] Remove the limiting plate 7 from the limiting groove 522 and the mating groove 251. Rotate the mounting part 52 of the roller 5 to drive the wheel body 51 into the mounting groove 25. The mounting part 52 drives the positioning buckle 521 to abut against the inclined wall 611 and pushes the positioning rod 61 to move closer to the baffle 64. After the positioning buckle 521 moves past the position of the positioning rod 61, the elastic element 63 pushes the positioning rod 61 through the positioning buckle 521 to position the roller 5 in the mounting groove 25.

[0057] The implementation principle of a gearbox according to an embodiment of this application is as follows:

[0058] The first substrate 2 and the second substrate 21 are moved away from each other. The extension plate 3 is moved between the first substrate 2 and the second substrate 21, and at the same time, the extension plate 3 drives the connecting shell 32 to move directly between the first shell 1 and the second shell 11. Then, the first substrate 2 and the second substrate 21 are moved towards each other, so that the plug plate 31 is inserted into the plug slot 22, and at the same time, the secondary gear 321 in the connecting shell 32 meshes with the main gear 12 in the first shell 1 and the second shell 11. At this time, the connecting block 33 is attached to the corresponding splicing block 23. Then, several connecting sleeves 4 are moved and respectively fitted onto one pair of connecting blocks 33 and splicing blocks 23 to realize the connection between the extension plate 3 and the first substrate 2 and the second substrate 21. The detachable connection of the first shell 1 and the second shell 11, the detachable connection of the first substrate 2 and the second substrate 21, and the setting of the extension plate 3, the connecting shell 32, and the secondary gear 321 make the number of gears in the gearbox adjustable, and further make the transmission stage of the gearbox adjustable, thereby improving the adjustability of the gearbox.

[0059] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gearbox, comprising a housing and a base, wherein the housing is connected to the top wall of the base; characterized in that: The housing includes a first shell (1) and a second shell (11). The base includes a first base plate (2) for connecting to the first shell (1) and a second base plate (21) for connecting to the second shell (11). A main gear (12) is rotatably connected inside both the first shell (1) and the second shell (11). An extension plate (3) is provided between the first base plate (2) and the second base plate (21). A connecting shell (32) is provided on the extension plate (3). The connecting shell (32) is located between the first shell (1) and the second shell (11). A secondary gear (321) is rotatably connected inside the connecting shell (32). The secondary gear (321) meshes with the main gear (12). Insertion plates (31) are provided on the end walls on both sides of the extension plate (3). Insertion slots (22) for inserting the insertion plates (31) are opened on the end walls of the first base plate (2) and the second base plate (21). The extension plate (3) is detachably connected to the first base plate (2) and the second base plate (21). The extension plate (3) is provided with connecting blocks (33) on both sides, and the connecting blocks (33) are semi-cylindrical; the first substrate (2) and the second substrate (21) are provided with splicing blocks (23) that are attached to the connecting blocks (33), and the splicing blocks (23) are semi-cylindrical; the connecting blocks (33) and the splicing blocks (23) are fitted with the same connecting sleeve (4); The lower end of the connecting sleeve (4) is provided with a limiting block (41). The side walls of the connecting block (33) and the splicing block (23) are provided with a sliding groove (231) for the limiting block (41) to pass through. The side walls of the lower end of the connecting block (33) and the splicing block (23) are provided with an arc-shaped groove (232) for the limiting block (41) to be inserted. The inner side wall of the arc-shaped groove (232) is in contact with the side wall of the limiting block (41). A slot (233) is provided on the top wall of the inner sidewall of the arc-shaped groove (232). A limiting rod (234) is inserted into the slot (233). A spring (235) is connected between the limiting rod (234) and the bottom wall of the slot (233). An arc-shaped head (236) is provided at the end of the limiting rod (234) away from the spring (235). The arc-shaped head (236) extends out of the slot (233). A rack (24) is provided on the end wall of the first substrate (2) near the second substrate (21), and the rack (24) is inserted into the second substrate (21); a toothed disc (211) is provided on the top wall of the second substrate (21), and one side of the toothed disc (211) passes through the top wall of the second substrate (21) and meshes with the rack (24); a mounting plate is provided on one side of the second substrate (21), and a driving member (212) for driving the toothed disc (211) to rotate is provided on the mounting plate.

2. A gearbox according to claim 1, characterized in that: Rollers (5) are provided on the bottom walls of the first substrate (2) and the second substrate (21). Mounting grooves (25) for mounting the rollers (5) are provided on both the first substrate (2) and the second substrate (21). Several mounting grooves (25) are respectively connected to the top wall, bottom wall and side wall of the corresponding first substrate (2) and the second substrate (21). The roller (5) includes a wheel body (51) and a mounting part (52). The wheel body (51) is rotatably connected to the mounting part (52). The mounting part (52) is rotatably connected to the inner side wall of the mounting groove (25). A positioning component (6) for positioning the mounting part (52) is provided on the top wall of the first substrate (2) and the second substrate (21). A limiting member for limiting the mounting part (52) is provided in the mounting groove (25).

3. A gearbox according to claim 2, characterized in that: Each of the positioning components (6) includes a positioning rod (61), a positioning sleeve (62), an elastic element (63), and a baffle (64). A plurality of the positioning sleeves (62) are fixedly installed on the top walls of the corresponding first substrate (2) and second substrate (21). The baffle (64) is located at one end of the positioning sleeve (62). The positioning rod (61) is inserted into and passes through the positioning sleeve (62). The elastic element (63) is located between the baffle (64) and the positioning rod (61). The end of the positioning rod (61) away from the elastic element (63) extends from above the mounting groove (25). The side of the positioning rod (61) near the mounting part (52) is provided with a sloping wall (611). The side of the mounting part (52) near the positioning rod (61) is provided with a positioning buckle (521) for the positioning rod (61) to be inserted.

4. A gearbox according to claim 3, characterized in that: The limiting component includes a limiting plate (7). The mounting part (52) has a limiting groove (522) on the side away from the wheel body (51). The inner side wall of the mounting groove (25) has a mating groove (251) that communicates with the top wall of the corresponding first substrate (2) and second substrate (21). The limiting plate (7) can be inserted into the limiting groove (522) and the mating groove (251).

5. A method of using the gearbox according to claim 4, characterized in that: Move the positioning rod (61) to remove the positioning rod (61) from the positioning buckle (521), lift the gearbox and rotate the mounting part (52) of the roller (5) so that the wheel (51) rotates to the bottom wall side of the first base plate (2) and the second base plate (21), and move the limiting plate (7) into the limiting groove (522) and the mating groove (251); Start the drive unit (212) to drive the gear plate (211) to rotate, which in turn drives the meshing rack (24) to move, causing the first substrate (2) to move away from the second substrate (21). After the first substrate (2) moves to the appropriate position, turn off the drive unit (212). Move the extension plate (3) between the first substrate (2) and the second substrate (21), drive the drive unit (212) to move the first substrate (2) closer to the second substrate (21), and insert the plug plate (31) into the plug slot (22); at the same time, all connecting blocks (33) and the corresponding splicing blocks (23) are aligned. The movable connecting sleeve (4) is inserted and sleeved on the connecting block (33) and splicing block (23), and at the same time, it drives the limiting block (41) to pass through the slide groove (231) and insert into the arc groove (232). Rotating the connecting sleeve (4) drives the limiting block (41) to move along the length direction of the arc groove (232); the limiting block (41) contacts the arc head (236) and pushes the limiting rod (234) to insert into the slot (233), so that the position of the limiting block (41) is between the limiting rod (234) and the inner wall of the arc groove (232); Remove the limiting plate (7) from the limiting groove (522) and the mating groove (251), rotate the mounting part (52) of the roller (5) to drive the wheel body (51) into the mounting groove (25), the mounting part (52) drives the positioning buckle (521) to abut against the inclined wall (611), and pushes the positioning rod (61) to move closer to the baffle (64); after the positioning buckle (521) moves past the position of the positioning rod (61), the elastic element (63) pushes the positioning rod (61) through the positioning buckle (521) to position the roller (5) in the mounting groove (25).

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