阅读说明：本技术 一种差速器五轴自动变位变距拧紧装置 (Five-axis automatic displacement variable-pitch tightening device for differential mechanism ) 是由 潘俊 刘冲 杨秋生 于 2021-07-08 设计创作，主要内容包括：本发明公开了一种差速器五轴自动变位变距拧紧装置,本发明涉及汽车零部件装配技术领域,包括升降机构、变位机构、变距机构和拧紧轴,升降机构包括升降组件、底板和背板,升降组件设于背板端面上,底板垂直于背板且与升降组件连接,在底板上具有第一通孔；变位机构设于底板上,变位机构包括驱动组件和位于第一通孔处的变位组件；变距机构设于变位组件上端面；拧紧轴竖直设置在变位组件内并与变位组件连接,且下端穿设于第一通孔。拧紧轴被固定于变位机构上,变位机构可对拧紧轴与差速器之间的拧紧进行定位,无需人为手持拧紧轴进行定位,变距机构可驱动拧紧轴进行变距,以适用于不同尺寸的差速器的拧紧,使用起来比较简单,操作方便。(The invention discloses a five-axis automatic displacement and variable-pitch tightening device for a differential, which relates to the technical field of automobile part assembly and comprises a lifting mechanism, a displacement mechanism, a variable-pitch mechanism and a tightening shaft, wherein the lifting mechanism comprises a lifting assembly, a bottom plate and a back plate, the lifting assembly is arranged on the end surface of the back plate, the bottom plate is perpendicular to the back plate and is connected with the lifting assembly, and a first through hole is formed in the bottom plate; the position changing mechanism is arranged on the bottom plate and comprises a driving assembly and a position changing assembly positioned at the first through hole; the variable pitch mechanism is arranged on the upper end surface of the displacement component; the tightening shaft is vertically arranged in the displacement assembly and connected with the displacement assembly, and the lower end of the tightening shaft penetrates through the first through hole. The tightening shaft is fixed on the shifting mechanism, the shifting mechanism can position the tightening between the tightening shaft and the differential mechanism, the tightening shaft does not need to be manually held for positioning, the distance changing mechanism can drive the tightening shaft to change the distance so as to be suitable for tightening differentials with different sizes, and the device is simple to use and convenient to operate.)

1. The utility model provides a five automatic displacement tightening devices of differential mechanism which characterized in that includes:

the lifting mechanism (1) comprises a lifting component (11), a bottom plate (12) and a back plate (13), the lifting component (11) is arranged on the end face of the back plate (13), the bottom plate (12) is perpendicular to the back plate (13) and is connected with the lifting component (11), and a first through hole (121) is formed in the bottom plate (12);

the displacement mechanism (2) is arranged on the bottom plate (12), the displacement mechanism (2) comprises a driving component (21) and a displacement component (22) positioned at the first through hole (121), and the driving component (21) can drive the displacement component (22) to rotate;

the distance changing mechanism (3) is arranged on the upper end surface of the displacement component (22);

the tightening shaft (4) is vertically arranged in the displacement component (22) and is connected with the displacement component (22), the lower end of the tightening shaft penetrates through the first through hole (121), and the distance changing mechanism (3) can drive the tightening shaft (4) to move relative to the displacement component (22).

2. The five-axis automatic shifting and pitch-changing tightening device for a differential according to claim 1, characterized in that: the lifting assembly (11) comprises a first guide rail (111) which is vertically arranged and arranged on the front end face of the back plate (13), a sliding plate (112) is arranged on the first guide rail (111), an electric cylinder (113) is vertically arranged on the upper portion of the front end face of the back plate (13), and the electric cylinder (113) is connected with the front end face of the back plate (13) through a first mounting seat (114); the lower end of the electric cylinder (113) is connected with a connecting seat (115) arranged on the front end surface of the sliding plate (112); the bottom plate (12) is perpendicular to the sliding plate (112), one end of the bottom plate (12) is connected with the lower portion of the sliding plate (112), and the other sides of the bottom plate (12) are connected with the baffle plates (116).

3. The five-axis automatic shifting and pitch-changing tightening device for the differential according to claim 2, characterized in that:

the driving assembly (21) comprises a second mounting seat (211), a displacement motor (212) and a displacement gear (213), the second mounting seat (211) is arranged on the bottom plate (12), the displacement motor (212) is connected to the second mounting seat (211), and the displacement gear (213) is arranged on an output shaft of the displacement motor (212);

the shifting assembly (22) comprises a shifting gear ring (221), a shifting pad (222) and a connecting plate (223), the shifting gear ring (221) is rotatably connected to the bottom plate (12) and located at the position of the first through hole (121), the shifting gear ring (221) is meshed with the shifting gear (213), the shifting pad (222) is fixedly connected to the upper end face of the shifting gear ring (221), the connecting plate (223) is fixedly connected to the upper end face of the shifting pad (222), second through holes (224) are formed in the shifting pad (222) and the connecting plate (223), and the tightening shaft (4) penetrates through the second through hole (224) and the shifting gear ring (221) and is connected with the connecting plate (223).

4. The five-axis automatic shifting and pitch-changing tightening device for a differential according to claim 3, characterized in that: the steel ball type shifting mechanism is characterized in that an annular ring block (121) is arranged on the bottom plate (12), a first through groove (122) arranged around the ring block (121) is formed in the outer side of the ring block (121), a steel ball (123) is rotationally arranged in the first through groove (122), and the outer wall of the ring block (121) is sleeved with the shifting gear ring (221).

5. The five-axis automatic shifting and pitch-changing tightening device for a differential according to claim 4, wherein: the variable-pitch mechanism (3) comprises a third mounting seat (31), a variable-pitch motor (32), a variable-pitch gear (33), a variable-pitch disc (34), a fixed seat (35), a guide wheel (36), an arc-shaped variable-pitch rack (37), a mounting block (38) and a second guide rail (39), wherein the third mounting seat (31) is fixedly connected to a connecting plate (223), the variable-pitch motor (32) is connected to the third mounting seat (31), the variable-pitch gear (33) is arranged on an output shaft of the variable-pitch motor (32), the fixed seat (35) is provided with a plurality of wheels which are arranged on the upper end surface of the connecting plate (223) at intervals around the central axis of the connecting plate (223), the guide wheels (36) correspond to the fixed seats (35) one by one and are rotatably arranged on the upper part of the fixed seat (35), the guide wheels (36) are respectively provided with a wheel groove, the outer side of the variable-pitch disc (34) is movably clamped in the wheel grooves of the guide wheel (36), and the variable-pitch rack (37) is fixedly connected to the variable-pitch disc (34) and is meshed with the variable-pitch gear (33), the variable-pitch disc (34) is annular, the tightening shafts (4) are arranged into five parts and are sequentially arranged on the variable-pitch disc (34), the two second through holes (224), the ring block (121) and the first through hole (121), the middle parts of the tightening shafts (4) are horizontally provided with the installation block (38), the bottom of the installation block (38) is fixedly connected with a sliding block (391), the second guide rail (39) is arranged on the connecting plate (223) and is arranged in a one-to-one correspondence with the sliding block (391), the upper end face of the installation plate is provided with bolts (392), the variable-pitch disc (34) is provided with arc-shaped second through grooves (393) in one-to-one correspondence with the bolts (392), and the bolts (392) are arranged in the second through grooves (393) in a penetrating mode and can move along the second through grooves (393).

6. The five-axis automatic shifting and pitch-changing tightening device for a differential according to claim 5, characterized in that: the bottom of bottom plate (12) is connected with five and compresses tightly bracing piece (51) vertically, and the bottom that compresses tightly the supporting rod respectively connects in one compresses tightly seat (52), compresses tightly and has seted up five breach (53) on seat (52), and five screw shaft (4) wear to locate five breach (53) respectively, and the bottom that compresses tightly seat (52) is connected with a pillar (54), and the cover is equipped with a spring (55) on pillar (54).

7. The five-axis automatic shifting and pitch-changing tightening device for a differential according to claim 6, wherein: the positioning device is characterized in that a limiting mechanism (6) is arranged on the bottom plate (12), the limiting mechanism (6) is located on the outer side of the displacement mechanism (2), and the displacement assembly (22) can be fixed by the limiting mechanism (6).

8. The five-axis automatic shifting and pitch-changing tightening device for a differential according to claim 7, characterized in that: stop gear (6) include fourth mount pad (61), cylinder (62) and spacing section of thick bamboo (63), bottom plate (12) up end is located in fourth mount pad (61), cylinder (62) fixed connection is in fourth mount pad (61) top, spacing section of thick bamboo (63) set up to two and interval arrangement in connecting plate (223) up end, the top of two spacing sections of thick bamboo (63) all is provided with recess (64), the free end of cylinder (62) can cooperate with recess (64) at spacing section of thick bamboo (63) top.

9. The five-axis automatic shifting and pitch-changing tightening device for a differential according to claim 8, wherein: the bottom plate (12) is provided with a limiting strip (124), and the limiting strip (124) is rotatably connected with a limiting block (125).

Technical Field

The invention relates to the technical field of automobile part assembly, in particular to a five-axis automatic tightening device for a differential mechanism.

Background

The differential is an important part in the assembly of automobile parts, in the production process of the differential, after all parts are assembled, bolts on a differential shell need to be screwed, so that the overall assembly is formed, at present, the screwing operation of bolts of the differential is mainly performed by manually holding a screwing shaft by hands, although the mode is feasible, in the screwing process, the reliability of the bolt screwing and the stress torque of the bolts are very critical, the uniformity of the screwing torque cannot be achieved by manual operation, and the stress torque of the bolts is different in size, so that the reliability is poor.

In order to solve this problem, many manufacturers use a tightening machine capable of performing automatic tightening to perform bolt tightening, however, the existing tightening machine can only perform bolt tightening on the differential of the same type, and when the position of the bolt on the differential is changed, a new tightening machine must be purchased, which increases the manufacturing cost. To address this problem, many manufacturers have developed variable pitch tightening machines.

The utility model discloses a title is "a machine of screwing up of variable distance" is disclosed in CN204771470U, it includes frame, elevating system and sideslip mechanism, the sideslip mechanism facial make-up is equipped with the tool, the elevating system facial make-up is equipped with the axle device of screwing up that is located the tool top, screw up the axle device and include servo lead screw subassembly and lifting support, and screw up an installation board, circumference displacement board and five screws up the axle of installing on screwing up the axle installation board, servo lead screw subassembly and screw up the axle installation board and install on lifting support, the displacement arc wall has been seted up on the circumference displacement board, sliding sleeve is equipped with the first guide pulley that the axle was established that screws up in the displacement arc wall, circumference displacement board facial make-up is equipped with the second guide pulley, servo lead screw subassembly sets firmly the connecting plate in strip type groove, the second guide pulley sliding sleeve is located the strip type inslot of connecting plate, better solution equipment can only the single problem of using. However, the tightening machine does not set the tightening position between the tightening shaft and the differential, and the tightening shaft needs to be held by a worker for positioning, so that the tightening machine is complicated to use, and the labor intensity of the worker is increased.

Disclosure of Invention

The invention aims to provide a five-axis automatic displacement and distance-changing screwing device for a differential mechanism, which can solve the problem that the screwing positioning between a screwing shaft and the differential mechanism is not set, and the screwing shaft needs to be held by a worker for positioning, so that the problem is complicated.

The invention aims to realize the five-axis automatic displacement and distance change screwing device of the differential mechanism by adopting the technical scheme, and the five-axis automatic displacement and distance change screwing device comprises a lifting mechanism, a displacement mechanism, a distance change mechanism and a screwing shaft, wherein the lifting mechanism comprises a lifting assembly, a bottom plate and a back plate, the lifting assembly is arranged on the end surface of the back plate, the bottom plate is perpendicular to the back plate and is connected with the lifting assembly, a first through hole is formed in the bottom plate, and the lifting assembly can drive the bottom plate to move relative to the back plate; the deflection mechanism is arranged on the bottom plate and comprises a driving assembly and a deflection assembly positioned at the first through hole, and the driving assembly can drive the deflection assembly to rotate so as to realize deflection positioning; the variable pitch mechanism is arranged on the upper end surface of the displacement component; the tightening shaft is vertically arranged in the displacement assembly and connected with the displacement assembly, the lower end of the tightening shaft penetrates through the first through hole, and the distance changing mechanism can drive the tightening shaft to move relative to the displacement assembly so as to realize distance changing.

The lifting assembly comprises a first guide rail which is vertically arranged and arranged on the front end face of the back plate, a sliding plate is arranged on the first guide rail, an electric cylinder is vertically arranged on the upper portion of the front end face of the back plate, and the electric cylinder is connected with the front end face of the back plate through a first mounting seat; the lower end of the electric cylinder is connected with a connecting seat arranged on the front end surface of the sliding plate so as to drive the sliding plate to move; the bottom plate perpendicular to slide setting and the one end of bottom plate and the sub-unit connection of slide all are connected with the baffle in other sides of bottom plate, and the electric jar can drive the bottom plate and remove.

Furthermore, the driving assembly comprises a second mounting seat, a deflection motor and a deflection gear, the second mounting seat is arranged on the bottom plate, the deflection motor is connected to the second mounting seat, the deflection gear is arranged on an output shaft of the deflection motor, and the deflection motor drives the deflection gear to rotate; the shifting assembly comprises a shifting gear ring, a transferring pad disc and a connecting plate, the shifting gear ring is rotatably connected to the bottom plate and located at the first through hole, the shifting gear ring is meshed with the shifting gear, the shifting motor rotates to drive the shifting gear ring to rotate, the transferring pad disc is fixedly connected to the upper end face of the shifting gear ring, the connecting plate is fixedly connected to the upper end face of the transferring pad disc, second through holes are formed in the transferring pad disc and the connecting plate, and the screwing shaft penetrates through the second through holes and the shifting gear ring and is connected with the connecting plate.

Preferably, the bottom plate is provided with an annular ring block, a first through groove arranged around the ring block is formed in the outer side of the ring block, steel balls are arranged in the first through groove in a rotating mode, the shifting gear ring is sleeved on the outer wall of the ring block, and the steel balls are abraded with the ring block in the rotating process of the shifting gear ring.

Further, the pitch-varying mechanism comprises a third mounting seat, a pitch-varying motor, a pitch-varying gear, a pitch-varying disc, a fixed seat, a guide wheel, an arc-shaped pitch-varying rack, a mounting block and a second guide rail, the third mounting seat is fixedly connected to the connecting plate, the pitch-varying motor is connected to the third mounting seat, the pitch-varying gear is arranged on an output shaft of the pitch-varying motor, the fixed seats are arranged on the upper end surface of the connecting plate at intervals around the central axis of the connecting plate, the guide wheels and the fixed seats are in one-to-one correspondence and rotatably arranged on the upper portion of the fixed seats, wheel grooves are formed in the guide wheels, the outer sides of the pitch-varying discs are movably clamped in the wheel grooves of the guide wheels to limit the positions of the pitch-varying disc, the pitch-varying rack is fixedly connected to the pitch-varying disc and meshed with the pitch-varying gear, the pitch-varying gear rotates to drive the pitch-varying rack to rotate, the pitch-varying disc is annular, and the tightening shafts are arranged in five shapes and sequentially penetrate through the pitch-varying disc and the two second through holes, The equal level in middle part of each screwing shaft is provided with the installation piece, the equal fixedly connected with slider in bottom of installation piece, and the second guide rail sets up in the connecting plate and arranges with the slider one-to-one, and the up end of mounting panel all is provided with the bolt, sets up on the displacement dish with the bolt one-to-one be curved second and leads to the groove, the bolt is worn to locate the second through-groove and can be followed the second through-groove and remove.

Preferably, the bottom of the bottom plate is vertically connected with five pressing support rods, the bottom of each pressing support rod is connected with a pressing seat, five notches are formed in the pressing seat, five tightening shafts are respectively arranged in the five notches in a penetrating mode to limit the tightening shafts to swing, bending deflection of the tightening shafts in the tightening process is avoided, and the like.

Preferably, the bottom plate is provided with a limiting mechanism, the limiting mechanism is located on the outer side of the displacement mechanism, and the limiting mechanism can fix the displacement assembly.

Specifically, stop gear includes fourth mount pad, cylinder and a spacing section of thick bamboo, and the bottom plate up end is located to the fourth mount pad, and cylinder fixed connection is in fourth mount pad top, and a spacing section of thick bamboo sets up to two and interval arrangement in connecting plate up end, and the top of two spacing sections of thick bamboo all is provided with the recess, and the free end of cylinder can cooperate with the recess at a spacing section of thick bamboo top to fix the connecting plate.

Preferably, the bottom plate is provided with a limiting strip, and the limiting strip is rotatably connected with a limiting block to limit the rotation of the connecting plate.

The five-axis automatic displacement and distance-changing screwing device for the differential mechanism, provided by the embodiment of the invention, has at least the following beneficial effects: the tightening shaft is fixed on the displacement mechanism through the matching use of the lifting mechanism, the displacement mechanism, the pitch-changing mechanism and the tightening shaft, the displacement mechanism can position the tightening between the tightening shaft and the differential mechanism, the tightening shaft does not need to be manually held for positioning, the pitch-changing mechanism can drive the tightening shaft to change the pitch, so that the differential mechanism is suitable for tightening differentials with different sizes, and the tightening mechanism is simple to use and convenient to operate.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention is further illustrated with reference to the following figures and examples:

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

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic structural diagram of the lifting mechanism of the present invention;

FIG. 4 is a schematic structural diagram of the lift mechanism of the present invention;

FIG. 5 is a top view of the lift mechanism of the present invention;

fig. 6 is a schematic structural view of a tightening shaft of the present invention;

FIG. 7 is a schematic view of the drive assembly and pitch motor of the present invention;

FIG. 8 is a schematic structural view of a spacing mechanism of the present invention;

FIG. 9 is a schematic view of the indexing mechanism and pitch mechanism of the present invention;

FIG. 10 is a schematic view of the indexing tooth plate and ring block of the present invention;

FIG. 11 is a schematic view of the ring block of the present invention;

fig. 12 is a schematic structural view of a tightening shaft of the present invention with a mounting block removed;

fig. 13 is a schematic structural view of the pitch change mechanism and the tightening shaft of the present invention.

Reference numerals: the lifting mechanism 1, the lifting component 11, the bottom plate 12, the back plate 13, the first through hole 121, the displacement mechanism 2, the driving component 21, the displacement component 22, the pitch varying mechanism 3, the tightening shaft 4, the first guide rail 111, the sliding plate 112, the electric cylinder 113, the first mounting seat 114, the connecting seat 115, the baffle 116, the second mounting seat 211, the displacement motor 212, the displacement gear 213, the displacement gear ring 221, the transfer pad disc 222, the connecting plate 223, the second through hole 224, the ring block 121, the first through groove 122, the steel ball 123, the third mounting seat 31, the pitch varying motor 32, the pitch varying gear 33, the pitch varying disc 34, the fixing seat 35, the guide wheel 36, the pitch varying rack 37, the mounting block 38, the second guide rail 39, the sliding block 391, the bolt 392, the second through groove 393, the pressing support rod 51, the pressing seat 52, the notch 53, the support column 54, the spring 55, the limit mechanism 6, the fourth mounting seat 61, the air cylinder 62, the limit cylinder 63, the groove 64, the limit bar 124, the limit strip 124, the stop rod 33, and the stop rod, A stop block 125.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, greater than, less than, exceeding, etc. are understood as excluding the present numbers, and the above, below, inside, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 and 2, the five-axis automatic shifting and pitch-changing tightening device for the differential according to the invention comprises a lifting mechanism 1, a shifting mechanism 2, a pitch-changing mechanism 3 and a tightening shaft 4, wherein the lifting mechanism 1 comprises a lifting component 11, a bottom plate 12 and a back plate 13, the lifting component 11 is arranged on the end surface of the back plate 13, the bottom plate 12 is perpendicular to the back plate and is connected with the lifting component 11, a first through hole 121 is formed in the bottom plate 12, and the lifting component 11 can drive the bottom plate 12 to move relative to the back plate 13; the displacement mechanism 2 is arranged on the bottom plate 12, the displacement mechanism 2 comprises a driving component 21 and a displacement component 22 positioned at the first through hole 121, and the driving component 21 can drive the displacement component 22 to rotate so as to realize displacement positioning; the pitch-changing mechanism 3 is arranged on the upper end surface of the position-changing component 22; the tightening shaft 4 is vertically arranged in the displacement component 22 and connected with the displacement component 22, the lower end of the tightening shaft is arranged in the first through hole 121 in a penetrating mode, and the distance changing mechanism 3 can drive the tightening shaft 4 to move relative to the displacement component 22 so as to achieve distance changing.

Through the cooperation use between elevating system 1, shifter 2, displacement mechanism 3 and tightening shaft 4, tightening shaft 4 is fixed in shifter 2, and shifter 2 can fix a position the tightening between tightening shaft 4 and the differential mechanism, need not the manual hand and fix a position tightening shaft 4, and displacement mechanism 3 can drive tightening shaft 4 and carry out the displacement to be applicable to the tightening of the differential mechanism of different sizes, and it is simple to use, convenient operation.

Referring to fig. 3, further, the lifting assembly 11 includes a first guide rail 111 disposed vertically on the front end surface of the back plate 13, a sliding plate 112 is disposed on the first guide rail 111, an electric cylinder 113 is disposed vertically on the upper portion of the front end surface of the back plate 13, and the electric cylinder 113 is connected to the front end surface of the back plate 13 through a first mounting seat 114; the lower end of the electric cylinder 113 is connected with a connecting seat 115 arranged on the front end surface of the sliding plate 112 so as to drive the sliding plate 112 to move; the bottom plate 12 is perpendicular to the sliding plate 112, one end of the bottom plate 12 is connected with the lower part of the sliding plate 112, the other sides of the bottom plate 12 are connected with the baffle 116, and the electric cylinder 113 can drive the bottom plate 12 to move.

In some embodiments, the first guide rail 111 and the electric cylinder 113 in the lifting mechanism 1 may be directly replaced by other devices having a lifting function, such as a linear module.

Referring to fig. 4, 7 and 9, the driving assembly 21 includes a second mounting base 211, a shift motor 212 and a shift gear 213, the second mounting base 211 is disposed on the bottom plate 12, the shift motor 212 is connected to the second mounting base 211, the shift gear 213 is disposed on an output shaft of the shift motor 212, and the shift motor 212 drives the shift gear 213 to rotate; the shifting assembly 22 comprises a shifting gear ring 221, a transfer pad 222 and a connecting plate 223, the shifting gear ring 221 is rotatably connected to the bottom plate 12 and located at the first through hole 121, the shifting gear ring 221 is meshed with the shifting gear 213, the shifting motor 212 rotates to drive the shifting gear ring 221 to rotate, the transfer pad 222 is fixedly connected to the upper end face of the shifting gear ring 221, the connecting plate 223 is fixedly connected to the upper end face of the transfer pad 222, second through holes 224 are respectively formed in the transfer pad 222 and the connecting plate 223, and the tightening shaft 4 penetrates through the second through holes 224 and the shifting gear ring 221 and is connected with the connecting plate 223.

When the bottom of the tightening shaft 4 does not correspond to the corresponding bolt 392 of the differential, the shifting motor 212 is started to drive the shifting gear 213 to rotate to drive the shifting fluted disc to rotate, so as to drive the tightening shaft 4 to rotate by a corresponding angle and then stop, so as to position the tightening shaft 4.

Referring to fig. 10 and 11, preferably, the bottom plate 12 is provided with an annular ring block 121, a first through groove 122 disposed around the ring block 121 is disposed on an outer side of the ring block 121, a steel ball 123 is rotatably disposed in the first through groove 122, the indexing ring gear 221 is sleeved on an outer wall of the ring block 121, and the steel ball 123 reduces wear between the indexing ring gear 221 and the ring block 121 in a rotating process.

Referring to fig. 5, 6, 9 and 13, further, the pitch change mechanism 3 includes a third mounting seat 31, a pitch change motor 32, a pitch change gear 33, a pitch change disc 34, a fixed seat 35, a guide wheel 36, an arc-shaped pitch change rack 37, a mounting block 38 and a second guide rail 39, the third mounting seat 31 is fixedly connected to a connecting plate 223, the pitch change motor 32 is connected to the third mounting seat 31, the pitch change gear 33 is disposed on an output shaft of the pitch change motor 32, the fixed seat 35 is disposed as a plurality of spaced apart from a central axis of the connecting plate 223, the guide wheels 36 are in one-to-one correspondence with the fixed seats 35 and rotatably disposed on upper portions of the fixed seats 35, the guide wheels 36 each have a wheel groove, an outer side of the pitch change disc 34 is movably clamped in the wheel groove of the guide wheel 36 to limit a position of the pitch change disc 34, the pitch change rack 37 is fixedly connected to the pitch change disc 34 and engaged with the pitch change gear 33, the pitch change rack 37 is rotated by the pitch change gear 33, the variable-pitch disc 34 is annular, the tightening shafts 4 are five and are sequentially arranged in the variable-pitch disc 34, the two second through holes 224, the ring block 121 and the first through hole 121, the middle portion of each tightening shaft 4 is horizontally provided with the mounting block 38, the bottom of the mounting block 38 is fixedly connected with the sliding block 391, the second guide rails 39 are arranged on the connecting plate 223 and are arranged in a one-to-one correspondence with the sliding block 391, the upper end surface of the mounting plate is provided with the bolts 392, the variable-pitch disc 34 is provided with the arc-shaped second through grooves 393 in one-to-one correspondence with the bolts 392, one ends of the second through grooves 393 are close to the inner side of the variable-pitch disc 34, one ends of the second through grooves 393 are close to the outer side of the variable-pitch disc 34, and the bolts 392 are arranged in the second through grooves 393 and can move along the second through grooves 393.

When the differential gears of different sizes are encountered, the pitch varying motor 32 is started to drive the pitch varying gear 33 to rotate and drive the pitch varying rack 37 to rotate, so as to drive the shifting disk to rotate, and the bolt 392 on the mounting block 38 drives the tightening shaft 4 to move inwards or outwards through the second through groove 393 so as to adapt to the tightening of the differential gears of different sizes.

Specifically, the mounting block 38 includes a first clamping block and a second clamping block, the first clamping block and the second clamping block are sequentially sleeved on the tightening shaft 4, the second clamping block is slidably connected to the second guide rail 39, and the first clamping block clamps the second clamping block and the tightening shaft 4.

Referring to fig. 6 and 12, preferably, five pressing support rods 51 are vertically connected to the bottom of the base plate 12, the bottom of each pressing support rod is connected to a pressing base 52, five notches 53 are formed in the pressing base 52, five tightening shafts 4 are respectively inserted into the five notches 53 to limit the tightening shafts 4 from shaking, so as to prevent the tightening shafts 4 from bending and deviating during the tightening process, and a support 54 is connected to the bottom of the pressing base 52, and a spring 55 is sleeved on the support 54 for further support.

Referring to fig. 1, 2, 4 and 5, preferably, the bottom plate 12 is provided with a limiting mechanism 6, the limiting mechanism 6 is located outside the displacement mechanism 2, and the limiting mechanism 6 can fix the displacement assembly 22.

Referring to fig. 8, specifically, the limiting mechanism 6 includes a fourth mounting seat 61, a cylinder 62 and a limiting cylinder 63, the fourth mounting seat 61 is disposed on the upper end surface of the bottom plate 12, the cylinder 62 is fixedly connected to the top of the fourth mounting seat 61, the limiting cylinders 63 are disposed in two and spaced on the upper end surface of the connecting plate 223, the tops of the two limiting cylinders 63 are both provided with a groove 64, and the free end of the cylinder 62 can be matched with the groove 64 on the top of the limiting cylinder 63 to fix the connecting plate 223. When in use, the free end of the air cylinder 62 extends and is inserted into the groove 64 of the corresponding limiting cylinder 63 for fixing.

In some embodiments, the limiting mechanism 6 is not limited to the embodiment of the present invention, and other mechanisms, such as bolt fastening, may be used instead.

Preferably, the bottom plate 12 is provided with a limiting strip 124, and a limiting block 125 is rotatably connected to the limiting strip 124 to limit the rotation of the connecting plate 223.

One mode of operation of the present invention is as follows: the differential gear to be screwed is placed on a corresponding workbench, the lifting mechanism 1 controls the bottom plate 12 to move to a proper position, the pitch varying gear 33 is driven to rotate by starting the pitch varying motor 32 so that the pitch varying disc 34 rotates, the size of the bolt 392 on the mounting block 38 is adjusted through the second through groove 393 on the pitch varying disc 34, after the size is adjusted to a proper size, the shift varying motor 212 is started to drive the shift varying gear 213 to rotate so that the screwing shaft 4 rotates to a corresponding position, the limiting mechanism 6 is used for limiting and fixing the shift varying gear 213, and the screwing shaft 4 is used for screwing the bolt 392 of the differential gear.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.