Variable speed control device for honing machine

Abstract

The utility model relates to the technical field of honing machines, in particular to a variable speed control device for a honing machine, which comprises a first transmission case and a second transmission case which are connected with each other, a gear shifting and speed changing component is arranged in the first transmission case, and a speed reducing component is arranged in the second transmission case; the gear shifting and speed changing assembly comprises a first transmission shaft, a second transmission shaft and a third transmission shaft which are parallel to one another, and one end of the first transmission shaft can penetrate through the first transmission box to be connected with a rotating shaft of an external motor; a first gear assembly is arranged on the first transmission shaft; a second gear assembly is arranged on the second transmission shaft; the gear shifting mechanism further comprises a gear shifting handle assembly, and the gear shifting handle assembly comprises a first shifting fork capable of acting on the first gear assembly and a second shifting fork capable of acting on the second gear assembly. The device is simple in structure and convenient to control, and the torque and the rotating speed of the gear box of the honing machine can meet the requirements for the rotating speed and the torque of most honing apertures.

Description

Technical Field

[0001] The utility model relates to the technical field of honing machines, in particular to a speed control device for honing machines. Background Art

[0002] A honing machine is a grinding machine that uses a honing head to hone the workpiece surface. It is mainly used to hone the holes of workpieces in the manufacturing industries of automobiles, tractors, hydraulic parts, bearings, aviation, etc. In the prior art, the gearbox of the honing machine is mainly used to change the transmission ratio of the honing machine spindle motor, and the stepless speed regulation of the frequency converter is used to adapt to different working requirements.

[0003] However, the torque and speed of the gearbox of the traditional honing machine cannot meet the speed and torque requirements of all honing apertures. If a high-power motor is used, energy will be greatly wasted. If the motor is smaller, the torque will be insufficient for honing large holes. The use of a frequency converter for speed regulation has the problem of a small speed regulation range.

[0004] Therefore, a new technical solution is urgently needed to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned problems of the prior art and provide a speed control device for a honing machine to solve the technical problem that the torque and speed of the gearbox of the traditional honing machine cannot meet the speed and torque requirements of all honing apertures.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A speed control device for a honing machine comprises a first transmission box and a second transmission box connected to each other, wherein the first transmission box is provided with a gear shifting assembly, and the second transmission box is provided with a speed reduction assembly;

[0008] The gear shifting assembly comprises a first transmission shaft, a second transmission shaft and a third transmission shaft which are parallel to each other, one end of the first transmission shaft can pass through the first transmission box and be connected to the external motor shaft; a first gear assembly is arranged on the first transmission shaft, the first gear assembly can move axially relative to the first transmission shaft, and can rotate synchronously with the first transmission shaft in the circumferential direction;

[0009] The second transmission shaft is provided with a second gear assembly, and the second gear assembly can move axially relative to the second transmission shaft and can rotate synchronously with the second transmission shaft in the circumferential direction;

[0010] The third transmission shaft is provided with a first gear, a second gear, a third gear and a fourth gear;

[0011] The gear shift handle assembly further comprises a first shift fork capable of acting on the first gear assembly and a second shift fork capable of acting on the second gear assembly; the first shift fork can drive the first gear assembly to mesh with the first gear or the second gear, and the second shift fork can drive the second gear assembly to mesh with the third gear or the fourth gear;

[0012] The deceleration assembly comprises a fourth transmission shaft and a fifth transmission shaft which are parallel to each other, a fifth gear and a sixth gear are arranged on the fourth transmission shaft, a seventh gear which can mesh with the sixth gear is arranged on the fifth transmission shaft, and one end of the fifth transmission shaft passes through the second transmission box and is connected to an external synchronous pulley;

[0013] One end of the second transmission shaft extends into the second transmission box, and an eighth gear that can mesh with the fifth gear is provided at the end.

[0014] Further, the outer diameter of the first gear is greater than the outer diameter of the third gear, the outer diameter of the third gear is greater than the outer diameter of the second gear, and the outer diameter of the second gear is greater than the outer diameter of the fourth gear.

[0015] Furthermore, the first transmission shaft is a spline shaft, and the first gear assembly includes a first spline sleeve corresponding thereto, and a ninth gear and a tenth gear arranged on an outer wall of the first spline sleeve.

[0016] Furthermore, an outer diameter of the tenth gear is greater than an outer diameter of the ninth gear.

[0017] Furthermore, the outer wall of the first spline sleeve is also provided with a first shift fork slot into which the first shift fork can be movably inserted.

[0018] Furthermore, the second transmission shaft is a spline shaft, and the second gear assembly includes a second spline sleeve corresponding thereto, and an eleventh gear and a twelfth gear arranged on an outer wall of the second spline sleeve.

[0019] Further, the outer diameter of the twelfth gear is greater than the outer diameter of the eleventh gear.

[0020] Furthermore, the outer wall of the second spline sleeve is also provided with a second shift fork slot into which the second shift fork can be movably inserted.

[0021] Furthermore, the shift handle assembly further comprises a first guide rod and a second guide rod which are arranged in parallel in the first transmission case, the first guide rod is movably sleeved with a first shift fork sleeve, the first shift fork sleeve is connected to the first shift fork; the second guide rod is movably sleeved with a second shift fork sleeve, the second shift fork sleeve is connected to the second shift fork;

[0022] A first fork tooth path and a second fork tooth path are respectively arranged on the top of the first fork sleeve and the bottom of the second fork sleeve. The first fork tooth path is driven by meshing with a first tooth path gear, and the second fork tooth path is driven by meshing with a second tooth path gear.

[0023] Furthermore, the first tooth path gear is connected to one end of the handle shaft, and the other end of the handle shaft is provided with a first handle;

[0024] The second tooth path gear is connected to one end of the handle rotating cylinder, and the other end of the handle rotating cylinder is provided with a second handle;

[0025] The handle rotating cylinder is movably sleeved on the outer side of the handle rotating shaft.

[0026] The utility model provides a speed control device for a honing machine, which adopts a first transmission box and a second transmission box that are connected to each other to achieve modular assembly, with a compact structure and convenient operation. Manual gear shifting is achieved through a gear shifting and speed change assembly to achieve the purpose of large-scale adjustment of the four-speed speed, and then the speed is transmitted to the outside through a reduction assembly. It can also cooperate with a frequency converter to fine-tune each gear position. After deceleration, the torque is large and the motor power is small. The input shaft and the output shaft can be continuously variable and shifted, so that the transmission ratio can be flexibly adjusted to meet different work requirements. This device is not only simple in structure and easy to control, but also can make the torque and speed of the honing machine gearbox meet the speed and torque requirements of most honing apertures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a speed control device for a honing machine according to the utility model from a first perspective;

[0028] Figure 2 This is a schematic structural diagram of a speed control device for a honing machine from a second viewing angle according to the utility model;

[0029] Figure 3 This is an exploded view from a first perspective of a speed control device for a honing machine according to the utility model;

[0030] Figure 4 This is an exploded view from a second perspective of a speed control device for a honing machine according to the utility model;

[0031] Figure 5 This is a schematic diagram of the connection between the gear shifting and speed changing assembly and the speed reduction assembly in the speed change control device for a honing machine described in the utility model;

[0032] Figure 6 It is a structural schematic diagram of a gear shifting and speed changing assembly in a speed change control device for a honing machine according to the utility model;

[0033] Figure 7 This is a schematic diagram of the application of a speed control device for a honing machine according to the utility model.

[0034] Graphic marking:

[0035] 1-first transmission box, 101-first box body, 102-first box cover, 103-first transmission shaft through hole, 104-second transmission shaft first through hole, 105-handle through hole;

[0036] 2-second transmission box, 201-second box body, 202-second box cover, 203-fifth transmission shaft through hole, 204-second transmission shaft second through hole;

[0037] 3-shift speed change assembly, 301-first transmission shaft, 302-second transmission shaft, 303-third transmission shaft, 304-first gear assembly, 305-second gear assembly, 306-first gear, 307-second gear, 308-third gear, 309-fourth gear, 310-shift handle assembly, 311-first spline sleeve, 312-ninth gear, 313-tenth gear, 314-first shift fork slot, 315-second spline sleeve, 316-eleventh gear, 317 - twelfth gear, 318- second fork slot, 319- first fork, 320- second fork, 321- eighth gear, 322- first guide rod, 323- second guide rod, 324- guide rod slot, 325- first fork sleeve, 326- second fork sleeve, 327- first fork tooth path, 328- second fork tooth path, 329- handle shaft, 330- first handle, 331- handle cylinder, 332- second handle, 333- first tooth path gear, 334- second tooth path gear;

[0038] 4-reduction assembly, 401-fourth transmission shaft, 402-fifth transmission shaft, 403-fifth gear, 404-sixth gear, 405-seventh gear;

[0039] 5- synchronous pulley;

[0040] 6-Ball bearing;

[0041] 7- Honing machine spindle;

[0042] 8-Bearing mounting slot. DETAILED DESCRIPTION

[0043] The utility model is further described in detail below based on the accompanying drawings and embodiments. The described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] like Figure 1 and Figure 2 As shown, the present solution provides a speed control device for a honing machine, comprising a first transmission box 1 and a second transmission box 2 connected to each other, wherein the first transmission box 1 is provided with a gear shifting assembly 3, and the second transmission box 2 is provided with a speed reduction assembly 4;

[0045] Among them, Figure 5 and Figure 6 As shown, the gear shifting assembly 3 includes a first transmission shaft 301, a second transmission shaft 302 and a third transmission shaft 303 which are parallel to each other. One end of the first transmission shaft 301 can pass through the first transmission box 1 to be connected to the external motor shaft. A first gear assembly 304 is provided on the first transmission shaft 301. The first gear assembly 304 can move axially relative to the first transmission shaft 301 and can rotate synchronously with the first transmission shaft 301 in the circumferential direction.

[0046] The second transmission shaft 302 is provided with a second gear assembly 305, and the second gear assembly 305 can move axially relative to the second transmission shaft 302, and can rotate synchronously with the second transmission shaft 302 in the circumferential direction;

[0047] The third transmission shaft 303 is provided with a first gear 306, a second gear 307, a third gear 308 and a fourth gear 309;

[0048] like Figure 6 As shown, the shift handle assembly 310 is also included, and the shift handle assembly 310 includes a first shift fork 319 that can act on the first gear assembly 304, and a second shift fork 320 that can act on the second gear assembly 305; the first shift fork 319 can drive the first gear assembly 304 to mesh with the first gear 306 or the second gear 307, and the second shift fork 320 can drive the second gear assembly 305 to mesh with the third gear 308 or the fourth gear 309;

[0049] The deceleration assembly 4 includes a fourth transmission shaft 401 and a fifth transmission shaft 402 which are parallel to each other, a fifth gear 403 and a sixth gear 404 are arranged on the fourth transmission shaft 401, a seventh gear 405 which can mesh with the sixth gear 404 is arranged on the fifth transmission shaft 402, and one end of the fifth transmission shaft 402 passes through the second transmission box 2 and is connected to the external synchronous pulley 5;

[0050] One end of the second transmission shaft 302 extends into the second transmission box 2 , and an eighth gear 321 capable of meshing with the fifth gear 403 is provided at the end.

[0051] It should be noted that, in this embodiment, the outer diameter of the fifth gear 403 is greater than the outer diameter of the sixth gear 404 , and the outer diameter of the seventh gear 405 is greater than the outer diameter of the eighth gear 321 .

[0052] Working principle:

[0053] like Figure 5 to Figure 7 As shown, according to the processing requirements of the honing workpiece, the first shift fork 319 in the shift handle assembly 3 is used to switch the meshing of the first gear assembly 304 with the first gear 306 or the second gear 307 to achieve a first-stage transmission;

[0054] The second shift fork 320 in the shift handle assembly 3 switches the meshing of the second gear assembly 305 with the third gear 308 or the fourth gear 309 to achieve secondary transmission;

[0055] The third gear transmission is realized by the meshing of the eighth gear 321 and the fifth gear 403;

[0056] The meshing of the sixth gear 404 and the seventh gear 405 realizes a four-stage transmission.

[0057] Finally, the regulated speed is brought to the synchronous pulley 5 via the fifth transmission shaft 402, and then the speed is transmitted to the honing machine main shaft 7 located below via the belt through the synchronous pulley 5.

[0058] It should be noted that the operation of the above-mentioned primary transmission and secondary transmission can realize four-speed switching, thereby better realizing the speed regulation and control of the final output.

[0059] In addition, if Figure 3 and Figure 4 As shown, in this embodiment, the first transmission box 1 includes a first box body 101 and a first box cover 102 that match each other. The first box cover 102 is provided with a first transmission shaft through hole 103 through which the end of the first transmission shaft 301 can extend.

[0060] The structure of the first transmission case 1 can realize accurate assembly of the gear shifting assembly 3 in the case.

[0061] It should be further explained that, in order to facilitate the free rotation of the first transmission shaft 301, the second transmission shaft 302 and the third transmission shaft 303, in this embodiment, ball bearings 6 are respectively provided on the ends of the first transmission shaft 301, the second transmission shaft 302 and the third transmission shaft 303, and each ball bearing 6 is respectively embedded in a bearing mounting groove 8 opened on the first box body 101 and the first box cover 102.

[0062] Among them, the first box body 101 is also provided with a handle through hole 105 for the shift handle assembly 3 to act on, and a second transfer shaft first through hole 104 for the second transfer shaft 302 to pass through, so that the second transfer shaft 302 can extend into the second transmission box 2 along the second transfer shaft first through hole 104.

[0063] like Figure 3 and Figure 4 As shown, in this embodiment, the second transmission box 2 includes a second box body 201 and a second box cover 202 that match each other, and the second box cover 202 is provided with a fifth transmission shaft through hole 203 for the end of the fifth transmission shaft 402 to extend out, and the second box body 201 is provided with a second transmission shaft second through hole 204 for the second transmission shaft 302 to pass through.

[0064] The structure of the second transmission box 2 can realize accurate assembly of the reduction assembly 4 in the box.

[0065] It should be further explained that, in order to facilitate the free rotation of the fourth transmission shaft 401 and the fifth transmission shaft 402, in this embodiment, ball bearings 6 are respectively provided at both ends of the fourth transmission shaft 401, and each ball bearing 6 is respectively embedded in a bearing mounting groove 8 opened on the second box body 201 and the second box cover 202.

[0066] A ball bearing 6 is disposed between the middle section of the fifth transmission shaft 402 and the inner wall of the fifth transmission shaft through hole 203 .

[0067] like Figure 5 As shown, in this embodiment, the outer diameter of the first gear 306 is greater than the outer diameter of the third gear 308 , the outer diameter of the third gear 308 is greater than the outer diameter of the second gear 307 , and the outer diameter of the second gear 307 is greater than the outer diameter of the fourth gear 309 .

[0068] Specifically, in this embodiment, the first gear 306, the second gear 307, the third gear 308 and the fourth gear 309 are arranged from the first box body 101 side to the first box cover 102 side, and the size constraints of each gear can facilitate the first gear assembly 304 located on the first transmission shaft 301 and the second gear assembly 305 located on the second transmission shaft 302 to be adjusted separately, thereby forming meshing.

[0069] In this embodiment, the first transmission shaft 301 is a spline shaft, and the first gear assembly 304 includes a first spline sleeve 311 corresponding thereto, and a ninth gear 312 and a tenth gear 313 arranged on the outer wall of the first spline sleeve 311; through the axial movement of the first spline sleeve 311 relative to the first transmission shaft 301, the ninth gear 312 can be meshed with the first gear 306, or the tenth gear 313 can be meshed with the second gear 307.

[0070] The outer diameter of the tenth gear 313 is greater than the outer diameter of the ninth gear 312 .

[0071] On the other hand, a first fork slot 314 into which the first fork 319 can be movably inserted is further provided on the outer wall of the first spline sleeve 311 .

[0072] In this embodiment, the second transmission shaft 302 is a spline shaft, and the second gear assembly 305 includes a second spline sleeve 315 corresponding thereto, and an eleventh gear 316 and a twelfth gear 317 arranged on the outer wall of the second spline sleeve 315; through the axial movement of the second spline sleeve 315 relative to the second transmission shaft 302, the eleventh gear 316 can be meshed with the sixth gear 404, or the twelfth gear 317 can be meshed with the fourth gear 309.

[0073] The outer diameter of the twelfth gear 317 is greater than the outer diameter of the eleventh gear 316 .

[0074] On the other hand, the outer wall of the second spline sleeve 315 is further provided with a second fork slot 318 into which the second fork 320 can be movably inserted.

[0075] It should be noted that in this embodiment, the first transmission shaft 301 and the second transmission shaft 302 are spline shafts, which are a type of mechanical transmission. They have the same functions as flat keys, semicircular keys, and oblique keys, and are all used to transmit mechanical torque. There are longitudinal keyways on the surface of the shaft, and the rotating parts sleeved on the shaft also have corresponding keyways, which can keep rotating synchronously with the shaft. While rotating, some can also slide longitudinally on the shaft, such as the gear shift gear of the gearbox.

[0076] like Figure 6 As shown, the shift handle assembly 310 in this embodiment further includes a first guide rod 322 and a second guide rod 323 which are arranged in parallel in the first transmission case 1, and the two ends of the first guide rod 322 and the second guide rod 323 are respectively sleeved through guide rod grooves 324 provided on the inner walls of the first case body 101 and the first case cover 102 to achieve fixation; a first shift fork sleeve 325 is movably sleeved on the first guide rod 322, and the first shift fork sleeve 325 is connected to the first shift fork 319; a second shift fork sleeve 326 is movably sleeved on the second guide rod 323, and the second shift fork sleeve 326 is connected to the second shift fork 320;

[0077] A first fork tooth path 327 and a second fork tooth path 328 are respectively provided at the top of the first fork sleeve 325 and the bottom of the second fork sleeve 326 . The first fork tooth path 327 is driven by a first tooth path gear 333 , and the second fork tooth path 328 is driven by a second tooth path gear 334 .

[0078] The first toothed gear 333 is connected to one end of the handle shaft 329, and the other end of the handle shaft 329 is provided with a first handle 330;

[0079] The second toothed gear 334 is connected to one end of the handle cylinder 331 , and the other end of the handle cylinder 331 is provided with a second handle 332 ;

[0080] The handle cylinder 331 is movably sleeved on the outer side of the handle shaft 329 .

[0081] In this embodiment, the first handle 330 is rotated to control the ninth gear 312 to mesh with the first gear 306, or the tenth gear 313 to mesh with the second gear 307; and the second handle 332 is used to control the eleventh gear 316 to mesh with the third gear 308, or the twelfth gear 317 to mesh with the fourth gear 309, so as to achieve four-gear adjustment control of the main shaft of the honing machine. The four gears include:

[0082] In the first gear, the ninth gear 312 is meshed with the first gear 306 , and the eleventh gear 316 is meshed with the third gear 308 ;

[0083] In the second gear, the ninth gear 312 is meshed with the first gear 306, and the twelfth gear 317 is meshed with the fourth gear 309;

[0084] In the third gear, the tenth gear 313 is meshed with the second gear 307 , and the eleventh gear 316 is meshed with the third gear 308 ;

[0085] In the fourth gear, the tenth gear 313 meshes with the second gear 307 , and the twelfth gear 317 meshes with the fourth gear 309 .

[0086] This device firstly realizes large-scale speed adjustment by manual shifting of four gears, and then the frequency converter makes fine adjustments at each gear. After deceleration, the torque is large and the motor power is small. Through the design of frequency converter plus manual shifting, the input shaft and output shaft can be continuously variable and shifted, so that the transmission ratio can be flexibly adjusted to meet different work requirements.

[0087] At the same time, in actual use, a gear position mark is also provided on the handle, through which the meshing position of the gears can be easily observed.

[0088] The above description is only for illustrating the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A speed control device for a honing machine, characterized in that: It comprises a first transmission box (1) and a second transmission box (2) which are connected to each other, wherein the first transmission box (1) is provided with a gear shifting assembly (3), and the second transmission box (2) is provided with a speed reduction assembly (4); The gear shifting assembly (3) comprises a first transmission shaft (301), a second transmission shaft (302) and a third transmission shaft (303) which are parallel to each other; one end of the first transmission shaft (301) can pass through the first transmission box (1) for connection with an external motor shaft; a first gear assembly (304) is provided on the first transmission shaft (301); the first gear assembly (304) can move axially relative to the first transmission shaft (301) and can rotate synchronously with the first transmission shaft (301) in the circumferential direction; A second gear assembly (305) is provided on the second transmission shaft (302), and the second gear assembly (305) can move axially relative to the second transmission shaft (302) and can rotate synchronously with the second transmission shaft (302) in the circumferential direction; The third transmission shaft (303) is provided with a first gear (306), a second gear (307), a third gear (308) and a fourth gear (309); The invention also comprises a shift handle assembly (310), wherein the shift handle assembly (310) comprises a first shift fork (319) capable of acting on the first gear assembly (304), and a second shift fork (320) capable of acting on the second gear assembly (305); the first shift fork (319) can drive the first gear assembly (304) to mesh with the first gear (306) or the second gear (307), and the second shift fork (320) can drive the second gear assembly (305) to mesh with the third gear (308) or the fourth gear (309); The deceleration assembly (4) comprises a fourth transmission shaft (401) and a fifth transmission shaft (402) which are parallel to each other; a fifth gear (403) and a sixth gear (404) are arranged on the fourth transmission shaft (401); a seventh gear (405) which can mesh with the sixth gear (404) is arranged on the fifth transmission shaft (402); one end of the fifth transmission shaft (402) passes through the second transmission box (2) and is connected to an external synchronous pulley (5); One end of the second transmission shaft (302) extends into the second transmission box (2), and an eighth gear (321) capable of meshing with the fifth gear (403) is provided at the end.

2. A speed control device for a honing machine according to claim 1, characterized in that: The outer diameter of the first gear (306) is greater than the outer diameter of the third gear (308), the outer diameter of the third gear (308) is greater than the outer diameter of the second gear (307), and the outer diameter of the second gear (307) is greater than the outer diameter of the fourth gear (309).

3. A speed control device for a honing machine according to claim 1 or 2, characterized in that: The first transmission shaft (301) is a spline shaft, and the first gear assembly (304) comprises a first spline sleeve (311) corresponding thereto, and a ninth gear (312) and a tenth gear (313) arranged on the outer wall of the first spline sleeve (311).

4. A speed control device for a honing machine according to claim 3, characterized in that: The outer diameter of the tenth gear (313) is greater than the outer diameter of the ninth gear (312).

5. The speed control device for a honing machine according to claim 3, characterized in that: The outer wall of the first spline sleeve (311) is also provided with a first shift fork slot (314) into which the first shift fork (319) can be movably inserted.

6. A speed control device for a honing machine according to claim 1 or 2, characterized in that: The second transmission shaft (302) is a spline shaft, and the second gear assembly (305) comprises a second spline sleeve (315) corresponding thereto, and an eleventh gear (316) and a twelfth gear (317) arranged on the outer wall of the second spline sleeve (315).

7. A speed control device for a honing machine according to claim 6, characterized in that: The outer diameter of the twelfth gear (317) is greater than the outer diameter of the eleventh gear (316).

8. A speed control device for a honing machine according to claim 6, characterized in that: The outer wall of the second spline sleeve (315) is also provided with a second shift fork slot (318) capable of being movably inserted into the second shift fork (320).

9. A speed control device for a honing machine according to claim 1, characterized in that: The shift handle assembly (310) further comprises a first guide rod (322) and a second guide rod (323) which are arranged in parallel with each other in the first transmission case (1); a first shift fork sleeve (325) is movably sleeved on the first guide rod (322), and the first shift fork sleeve (325) is connected to the first shift fork (319); a second shift fork sleeve (326) is movably sleeved on the second guide rod (323), and the second shift fork sleeve (326) is connected to the second shift fork (320); A first shift fork tooth path (327) and a second shift fork tooth path (328) are respectively arranged at the top of the first shift fork sleeve (325) and the bottom of the second shift fork sleeve (326); the first shift fork tooth path (327) is driven by meshing with a first tooth path gear (333), and the second shift fork tooth path (328) is driven by meshing with a second tooth path gear (334).

10. A speed control device for a honing machine according to claim 9, characterized in that: The first tooth path gear (333) is connected to one end of the handle rotating shaft (329), and the other end of the handle rotating shaft (329) is provided with a first handle (330); The second tooth path gear (334) is connected to one end of the handle rotating cylinder (331), and the other end of the handle rotating cylinder (331) is provided with a second handle (332); The handle rotating cylinder (331) is movably sleeved on the outer side of the handle rotating shaft (329).

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