CN216327527U

CN216327527U - Adjustable synchronous grinding device

Info

Publication number: CN216327527U
Application number: CN202121777575.6U
Authority: CN
Inventors: 陈显贵
Original assignee: Taicang Delta Precision Technology Co ltd
Current assignee: Taicang Delta Precision Technology Co ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-04-19
Anticipated expiration: 2031-08-02

Abstract

The utility model discloses an adjustable synchronous grinding device, which comprises: the grinding device comprises a workbench, a workpiece clamping device, a synchronous grinding device and a grinding driving device, wherein the workpiece clamping device, the synchronous grinding device and the grinding driving device are all arranged on the workbench, the workpiece clamping device is arranged on one side of the synchronous grinding device and is movably connected with the workbench, the grinding driving device is arranged on one side of the synchronous grinding device and is arranged opposite to the workpiece clamping device, and the synchronous grinding device is matched with the workpiece clamping device and the grinding driving device simultaneously. According to the utility model, the workpiece clamping device is used for clamping a product to be processed, and then the polishing driving device is used for driving the synchronous polishing device to polish the product, so that the polishing efficiency is improved, the processing stability and safety are effectively improved, the synchronous polishing device drives the polishing wire to polish the inner hole of the product, the uniformity of polishing the inner hole can be ensured, and the product polishing quality is improved.

Description

Adjustable synchronous grinding device

Technical Field

The utility model belongs to the technical field of metal processing, and particularly relates to an adjustable synchronous grinding device.

Background

Grinding is a necessary process in many metal parts machining processes, however, some metal parts with center holes are easy to grind on the outer surface, and grinding of the inner center hole is a difficult problem in the grinding process. Traditional grinding relies on the manual work to carry out manual grinding to it, and nevertheless artifical grinding efficiency is slower, and its quality can't guarantee, and everybody grinds the quality also different, and it can't satisfy customer's needs.

And the existing grinding equipment has only one grinding head, and only one end of the product can be ground once, so that the grinding is required to be carried out on two ends of the product twice, the processing efficiency is low, meanwhile, the grinding degrees of the two ends are inconsistent due to the two-time asynchronous grinding, errors exist at the two ends of a precise part, the production quality of the precise part is influenced, and the existing grinding equipment is still required to be improved.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the defects, the utility model aims to provide the adjustable synchronous grinding device which is simple in structure, reasonable in design, easy to produce and high in automation degree, a product to be processed is clamped by the workpiece clamping device, then the synchronous grinding device is driven by the grinding driving device to grind the product, the grinding efficiency is improved, the processing stability and safety are effectively improved, the synchronous grinding device drives the grinding wires to grind the inner hole of the product, the grinding consistency of the inner hole can be ensured, and the grinding quality of the product is improved.

The technical scheme is as follows: in order to achieve the above object, the present invention provides an adjustable synchronous grinding apparatus, comprising: the workpiece clamping device is arranged on one side of the synchronous grinding device and is movably connected with the workbench, the grinding driving device is arranged on one side of the synchronous grinding device and is arranged opposite to the workpiece clamping device, and the synchronous grinding device is simultaneously matched with the workpiece clamping device and the grinding driving device. According to the adjustable synchronous grinding device, a product to be processed is clamped through the workpiece clamping device, then the grinding driving device drives the synchronous grinding device to grind the product, so that the grinding efficiency is improved, the processing stability and safety are effectively improved, the synchronous grinding device drives the grinding wires to grind the inner hole of the product, the grinding consistency of the inner hole can be ensured, the grinding quality of the product is improved, and the product can better meet the production requirement

The workpiece clamping device comprises a clamping mounting plate and a workpiece clamping assembly, a mounting seat is arranged below the clamping mounting plate, the clamping mounting plate is connected with a bearing of the mounting seat through a rotating shaft, the mounting seat is connected with a first sliding rail on the workbench through a sliding plate, a second sliding rail is arranged on the clamping mounting plate, and the workpiece clamping assembly is arranged on the clamping mounting plate and is movably connected with the second sliding rail. The arrangement of the first sliding rail and the second sliding rail enables the workpiece clamping device to adjust the position of the workpiece clamping device on the workbench according to the actual requirements of production and processing, and meanwhile, the workpiece clamping assembly is movably connected with the second sliding rail to achieve adjustment of the transverse position, so that the workpiece clamping device can better meet the product grinding requirements.

Further, work piece centre gripping subassembly includes first grip block, second grip block, fixed block and adjusting screw, first grip block, second grip block and fixed block are all located on the second slide rail, just first grip block and second grip block set up relatively, adjusting screw passes behind the fixed block and is connected with the second grip block, just all be equipped with the centre gripping recess that is used for the centre gripping to treat the processing product on first grip block and the second grip block. The setting of centre gripping recess, great improvement the stability of product centre gripping, avoid it to appear sliding or skew in the course of working.

In addition, still include the dial plate subassembly, the dial plate subassembly includes dial plate and school zero mechanism, the dial plate is located between centre gripping mounting panel and the mount pad, just dial plate and centre gripping mounting panel coaxial coupling, one side of dial plate is located to the school zero mechanism, and both mutually support. The arrangement of the dial component enables the dial component to display the rotating angle of the workpiece clamping device and guarantees the accuracy of data of the workpiece clamping device.

Preferably, a first helical gear is arranged below the dial, a mounting groove plate is arranged below the first helical gear, a friction disc is arranged in the mounting groove plate, and a bearing is arranged below the friction disc; the zero calibration mechanism comprises a second bevel gear and a first driving rod, the second bevel gear is arranged at one end of the first driving rod, the second bevel gear is arranged at one side of the first bevel gear, the second bevel gear and the first bevel gear are meshed,

still including the separating mechanism who is used for separating calibrated scale and centre gripping mounting panel, separating mechanism includes second actuating lever and cam, the one end of second actuating lever is located to the cam, just the cam locate with the below of bearing, both mutually support.

Preferably, the synchronous grinding device comprises a group of supporting seats, a connecting cross rod and a group of grinding devices, the supporting seats are arranged on the workbench relatively, sliding grooves are formed in the connecting cross rod, the grinding devices are arranged on the connecting cross rod and movably connected with the connecting cross rod, the lower portions of the grinding devices are connected with the supporting seats, and grinding wires are arranged between the two grinding devices.

Further preferably, the polishing device comprises a polishing mounting seat, a rotating shaft, a driving wheel and a polishing clamping head, wherein the polishing mounting seat is Y-shaped and comprises a base and a group of connecting lugs, the base is arranged on the connecting cross rod in a penetrating mode, the connecting lugs are arranged above the base, the rotating shaft is arranged in the two connecting lugs and connected with the connecting lugs through bearings, the driving wheel is arranged on the rotating shaft and arranged between the two connecting lugs, the polishing clamping head is arranged at one end of the rotating shaft, the driving wheel is connected with the polishing driving device through a belt, and the polishing wire is arranged in an inner hole of a workpiece and clamped and fixed at two ends through the corresponding polishing clamping head (334).

Furthermore, the polishing driving device comprises a driving motor, a driving wheel and a double-drive driven mechanism, the driving motor is arranged on the workbench, the driving wheel is arranged at the output end of the driving motor, the double-drive driven mechanism is arranged between the polishing device and the polishing driving device, and the double-drive driven mechanism is connected with the driving wheel through a belt.

Preferably, two driven follower include a set of drive supporting seat, actuating lever, first follow driving wheel and a set of first drive wheel, the drive supporting seat is located on the workstation, the actuating lever is located on the drive supporting seat, first follow driving wheel is located on the actuating lever, first drive wheel is located on the actuating lever to locate first both sides from the driving wheel, first follow driving wheel passes through the belt and is connected with the drive wheel, first drive wheel passes through the belt and is connected with the drive wheel.

The technical scheme shows that the utility model has the following beneficial effects:

1. according to the adjustable synchronous grinding device, a product to be processed is clamped through the workpiece clamping device, then the grinding driving device drives the synchronous grinding device to grind the product, so that the grinding efficiency is improved, the processing stability and safety are effectively improved, the synchronous grinding device drives the grinding wires to grind the inner hole of the product, the grinding consistency of the inner hole can be ensured, the grinding quality of the product is improved, and the production requirement is better met.

2. The workpiece clamping device comprises a clamping mounting plate and a workpiece clamping assembly, wherein the mounting seat is connected with a first sliding rail on a workbench through a sliding plate, a second sliding rail is arranged on the clamping mounting plate, and the workpiece clamping assembly is arranged on the clamping mounting plate and is movably connected with the second sliding rail. The arrangement of the first sliding rail and the second sliding rail enables the workpiece clamping device to adjust the position of the workpiece clamping device on the workbench according to the actual requirements of production and processing, and meanwhile, the workpiece clamping assembly is movably connected with the second sliding rail to achieve adjustment of the transverse position, so that the workpiece clamping device can better meet the product grinding requirements.

3. According to the double-drive grinding device, the grinding driving device and the double-drive driven mechanism are matched with the synchronous grinding device, so that the double-drive driven mechanism can drive the two synchronous grinding devices simultaneously, the grinding efficiency is greatly improved, meanwhile, the synchronous driving also ensures the grinding consistency of two ends of a product, and the product processing quality is improved.

4. According to the utility model, the first clamping block and the second clamping block are respectively provided with a clamping groove for clamping a product to be processed. The setting of centre gripping recess, great improvement the stability of product centre gripping, avoid it to appear sliding or skew in the course of working.

5. According to the utility model, the arrangement of the dial assembly can display the rotation angle of the workpiece clamping device, and the zero calibration mechanism can calibrate the rotation angle of the workpiece clamping device, so that the data accuracy is effectively ensured.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a synchronous polishing apparatus according to the present invention;

FIG. 3 is a schematic view of a workpiece clamping device according to the present invention;

FIG. 4 is a partial schematic view of a retaining groove of the present invention;

FIG. 5 is a schematic structural view of a polishing driving device according to the present invention;

figure 6 is a schematic view of the mounting of the dial assembly of the present invention.

Detailed Description

The utility model is further elucidated with reference to the drawings and the embodiments.

Examples

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

An adjustable synchronous grinding device as shown in the figure is characterized in that: the method comprises the following steps: the workpiece clamping device 2, the synchronous grinding device 3 and the grinding driving device 4 are arranged on the workbench 1, the workpiece clamping device 2 is arranged on one side of the synchronous grinding device 3, the workpiece clamping device 2 comprises a clamping mounting plate 21 and a workpiece clamping component 22, a mounting seat 24 is arranged below the clamping mounting plate 21, the clamping mounting plate 21 is connected with a bearing of the mounting seat 24 through a rotating shaft, the mounting seat 24 is connected with a first slide rail 11 on the workbench 1 through a sliding plate, a second slide rail 23 is arranged on the clamping mounting plate 21, and the workpiece clamping component 22 is arranged on the clamping mounting plate 21 and movably connected with the second slide rail 23; the polishing driving device 4 is arranged on one side of the synchronous grinding device 3 and is arranged opposite to the workpiece clamping device 2, and the synchronous grinding device 3 is matched with the workpiece clamping device 2 and the polishing driving device 4 simultaneously.

In this embodiment the workpiece clamping assembly 22 includes a first clamping block 221, a second clamping block 222, a fixing block 223 and an adjusting screw 224, the first clamping block 221, the second clamping block 222 and the fixing block 223 are all disposed on the second slide rail 23, the first clamping block 221 and the second clamping block 222 are oppositely disposed, the adjusting screw 224 passes through the fixing block 223 and then is connected with the second clamping block 222, and clamping grooves 225 for clamping a product to be processed are disposed on the first clamping block 221 and the second clamping block 222.

In this embodiment, the synchronous grinding device 3 includes a set of supporting seat 31, a connecting cross bar 32 and a set of grinding device 33, the supporting seat 31 is relatively disposed on the worktable 1, the connecting cross bar 32 is provided with a sliding groove, the grinding device 33 is disposed on the connecting cross bar 32, the two are movably connected, the lower portion of the grinding device 33 is connected with the supporting seat 31, and a grinding wire is disposed between the two grinding devices 33.

In this embodiment, the polishing device 33 includes a polishing mounting base 331, a rotating shaft 332, a driving wheel 333 and a polishing clamping head 334, wherein the polishing mounting base 331 is Y-shaped and includes a base 3311 and a set of connecting lugs 3312, the base 3311 is threaded on the connecting cross bar 32, the connecting lugs 3312 are disposed above the base 3311, the rotating shaft 332 is threaded in the two connecting lugs 3312 and is connected to the connecting lugs 3312 through a bearing, the driving wheel 333 is disposed on the rotating shaft 332 and is disposed between the two connecting lugs 3312, the polishing clamping head 334 is disposed at one end of the rotating shaft 332, the driving wheel 333 is connected to the polishing driving device 4 through a belt, and the two ends of the polishing wire are clamped and fixed by the corresponding polishing clamping head 334 after penetrating through the inner hole of the workpiece.

In this embodiment, the polishing driving device 4 includes a driving motor 41, a driving wheel 42 and a dual-driving driven mechanism 43, the driving motor 41 is disposed on the working table 1, the driving wheel 42 is disposed at an output end of the driving motor 41, the dual-driving driven mechanism 43 is disposed between the polishing device 33 and the polishing driving device 4, and the dual-driving driven mechanism 43 is connected with the driving wheel 333 through a belt.

In this embodiment, the dual-drive driven mechanism 43 includes a set of driving support base 431, a driving rod 432, a first driven wheel 433 and a set of first driving wheel 434, the driving support base 431 is disposed on the workbench 1, the driving rod 432 is disposed on the driving support base 431, the first driven wheel 433 is disposed on the driving rod 432, the first driving wheel 434 is disposed on the driving rod 432 and is disposed on two sides of the first driven wheel 433, the first driven wheel 433 is connected with the driving wheel 333 through a belt, and the first driving wheel 434 is connected with the driving wheel 333 through a belt.

Example 2

Still include dial plate assembly 5 in this embodiment, dial plate assembly 5 includes calibrated scale 51 and zero calibration mechanism 52, calibrated scale 51 is located between centre gripping mounting panel 21 and mount pad 24, just calibrated scale 51 and centre gripping mounting panel 21 coaxial coupling, zero calibration mechanism 52 locates one side of calibrated scale 51, and both mutually support.

In the embodiment, a first bevel gear 53 is arranged below the dial plate 51, a mounting grooved plate 54 is arranged below the first bevel gear 53, a friction plate 55 is arranged in the mounting grooved plate 54, and a bearing 56 is arranged below the friction plate 55; the zero calibration mechanism 52 comprises a second bevel gear 521 and a first driving rod 522, the first driving rod 522 is disposed in the housing through a bearing seat, the second bevel gear 521 is disposed at one end of the first driving rod 522, the second bevel gear 521 is disposed at one side of the first bevel gear 53, the two bevel gears are meshed,

still including the separating mechanism 6 that is used for separating dial 51 and centre gripping mounting panel 21, separating mechanism 6 includes second actuating lever 61 and cam 62, second actuating lever 61 passes through the bearing mount pad and locates in the casing, the one end of second actuating lever 61 is located to cam 62, just cam 62 locate with the below of bearing 56, both mutually support.

The working principle of the adjustable synchronous grinding device in the embodiment is as follows:

1): firstly, a workpiece is placed on the workpiece clamping assembly 22, and the distance between the first clamping block 221 and the second clamping block 222 is adjusted through the adjusting screw 224 until the workpiece is clamped;

2): the synchronous grinding device 3 is adjusted to a proper position, namely the grinding device 33 moves to a proper position along the connecting cross rod 32 and then is connected with the supporting seat 31;

3): the grinding driving device 4 drives the synchronous grinding device 3 to grind the workpiece, that is, the driving motor 41 drives the driving wheel 42 to rotate, the first driven wheel 433 of the dual-drive driven mechanism 43 is driven by the driving wheel 42 to move together with the driving wheel, in the process, the first driving wheel 434 also rotates together with the first driven wheel 433, and the driving wheel 333 is driven to rotate by a belt when the first driving wheel 434 rotates;

4): the driving wheel 333 drives the rotating shaft 332 to rotate together in the rotating process, the two grinding clamping heads 334 drive the grinding wire to rotate continuously under the driving of the rotating shaft 332, and the inner hole of the workpiece is ground in the continuous rotating process of the grinding wire;

5): during the above operation, the workpiece holding device 2 can also be angularly adjusted as required, i.e. the workpiece holding device 2 is rotated and then calibrated by means of the dial assembly 5.

The specific working mode of the dial assembly 5 in this embodiment is as follows:

after the worker rotates the workpiece holding device 2, the worker checks whether the scales displayed on the dial 51 are accurate, and if not, the worker adjusts the scales through the zero calibration mechanism 52; in the working process, when the second driving rod 61 in the separating mechanism 6 rotates, the cam 62 lifts the bearing 56 and the friction disc 55, the dial 51 and the spindle are linked through the friction disc 55, when the cam 62 is put down, the dial 51 and the spindle are not linked, then the second bevel gear 521 is driven by the first driving rod 522 to drive the first bevel gear 53 to rotate through twisting the knob on the first driving rod 522, and the dial 51 is driven by the first bevel gear 53 to rotate along with the first bevel gear to a specified position, so that zero calibration is performed on the dial 51.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. The utility model provides a synchronous grinder of adjustable which characterized in that: the method comprises the following steps: workstation (1), work piece clamping device (2), synchronous grinder (3) and the drive arrangement (4) of polishing are all located on workstation (1), one side of synchronous grinder (3) is located in work piece clamping device (2) to do the portable connection with workstation (1), one side of synchronous grinder (3) is located in drive arrangement (4) of polishing to set up relatively with work piece clamping device (2), just synchronous grinder (3) cooperate with work piece clamping device (2) and drive arrangement (4) of polishing simultaneously.

2. The adjustable synchronous grinding apparatus of claim 1, wherein: workpiece clamping device (2) are including centre gripping mounting panel (21) and work piece centre gripping subassembly (22), the below of centre gripping mounting panel (21) is equipped with mount pad (24), centre gripping mounting panel (21) are connected through the bearing of pivot with mount pad (24), mount pad (24) are connected through sliding plate and first slide rail (11) on workstation (1), just be equipped with second slide rail (23) on centre gripping mounting panel (21), work piece centre gripping subassembly (22) are located on centre gripping mounting panel (21) to do the movable with second slide rail (23) and be connected.

3. The adjustable synchronous grinding apparatus of claim 2, wherein: the workpiece clamping assembly (22) comprises a first clamping block (221), a second clamping block (222), a fixing block (223) and an adjusting screw (224), wherein the first clamping block (221), the second clamping block (222) and the fixing block (223) are arranged on the second sliding rail (23), the first clamping block (221) and the second clamping block (222) are arranged oppositely, the adjusting screw (224) penetrates through the fixing block (223) and then is connected with the second clamping block (222), and a clamping groove (225) used for clamping a product to be processed is formed in the first clamping block (221) and the second clamping block (222).

4. The adjustable synchronous grinding apparatus of claim 2, wherein: still include dial plate subassembly (5), dial plate subassembly (5) include calibrated scale (51) and zero calibration mechanism (52), between centre gripping mounting panel (21) and mount pad (24) are located to calibrated scale (51), just calibrated scale (51) and centre gripping mounting panel (21) coaxial coupling, zero calibration mechanism (52) are located one side of calibrated scale (51), and both mutually support.

5. The adjustable synchronous grinding apparatus of claim 4, wherein: a first helical gear (53) is arranged below the dial (51), a mounting grooved plate (54) is arranged below the first helical gear (53), a friction disc (55) is arranged in the mounting grooved plate (54), and a bearing (56) is arranged below the friction disc (55); the zero calibration mechanism (52) comprises a second bevel gear (521) and a first driving rod (522), the second bevel gear (521) is arranged at one end of the first driving rod (522), the second bevel gear (521) is arranged at one side of the first bevel gear (53), and the second bevel gear and the first bevel gear are meshed,

still including separating mechanism (6) that is used for separating calibrated scale (51) and centre gripping mounting panel (21), separating mechanism (6) include second actuating lever (61) and cam (62), the one end of second actuating lever (61) is located in cam (62), just cam (62) locate with bearing (56) below, both mutually support.

6. The adjustable synchronous grinding apparatus of claim 2, wherein: the synchronous grinding device (3) comprises a group of supporting seats (31), a connecting cross rod (32) and a group of grinding devices (33), the supporting seats (31) are arranged on the workbench (1) relatively, sliding grooves are formed in the connecting cross rod (32), the grinding devices (33) are arranged on the connecting cross rod (32) and movably connected with each other, the lower portions of the grinding devices (33) are connected with the supporting seats (31), and grinding wires are arranged between the two grinding devices (33).

7. The adjustable synchronous grinding apparatus of claim 6, wherein: the polishing device (33) comprises a polishing mounting seat (331), a rotating shaft (332), a driving wheel (333) and a grinding and clamping head (334), wherein the polishing mounting seat (331) is Y-shaped and comprises a base (3311) and a group of connecting lugs (3312), the base (3311) is arranged on the connecting cross bar (32) in a penetrating way, the connecting lugs (3312) are arranged above the base (3311), the rotating shaft (332) is arranged in the two connecting lugs (3312) in a penetrating way, and is connected with the connecting lug (3312) through a bearing, the driving wheel (333) is arranged on the rotating shaft (332), and is arranged between the two connecting lugs (3312), the grinding and clamping head (334) is arranged at one end of the rotating shaft (332), the driving wheel (333) is connected with the grinding driving device (4) through a belt, the two ends of the grinding wire penetrate through the inner hole of the workpiece and are clamped and fixed through the corresponding grinding clamping heads (334).

8. The adjustable synchronous grinding apparatus of claim 6, wherein: grinding driving device (4) include driving motor (41), action wheel (42) and two driven follower (43), driving motor (41) are located on workstation (1), the output of driving motor (41) is located in action wheel (42), two driven follower (43) are located between grinding device (33) and the grinding driving device (4), just two driven follower (43) are connected with drive wheel (333) through the belt.

9. The adjustable synchronous grinding apparatus of claim 8, wherein: two driven follower (43) are including a set of drive supporting seat (431), actuating lever (432), first follow driving wheel (433) and a set of first drive wheel (434), workstation (1) is located in drive supporting seat (431), on drive supporting seat (431) was located in actuating lever (432), first follow driving wheel (433) was located on actuating lever (432), on actuating lever (432) was located in first drive wheel (434) to locate first both sides of following driving wheel (433), first follow driving wheel (433) and be connected with drive wheel (333) through the belt, first drive wheel (434) is connected with drive wheel (333) through the belt.