阅读说明：本技术 一种调平夹具及其控制方法 (leveling clamp and control method thereof ) 是由 谢运开 陈善猛 安波 杜卫东 于 2019-10-28 设计创作，主要内容包括：本发明提供一种调平夹具及其控制方法,所述的调平夹具包括第一升降单元,所述第一升降单元包括第一升降单元支撑座、调节螺母、调节螺杆；第二升降单元,所述第二升降单元包括第二升降单元支撑座、调节螺杆。第一调节单元,所述第一调节单元与所述第一升降单元调节螺母和第二升降单元调节螺杆的周向配合；第二调节单元,所述第二调节单元与所述第一升降单元调节螺杆的周向配合。当第一调节单元发生运动时,带动调节螺母转动,当第二调节单元发生运动时,带动调节螺杆转动,进而通过调节第一调节单元或者第二调节单元运动,带动调节螺母或者调节螺杆运动,最终使得调节螺杆做直线进给运动,调整与调节螺杆接触工件的高度。(The invention provides leveling clamps and a control method thereof, wherein the leveling clamps comprise a lifting unit, the lifting unit comprises a lifting unit supporting seat, an adjusting nut and an adjusting screw, the second lifting unit comprises a second lifting unit supporting seat and an adjusting screw, a adjusting unit, the adjusting unit is matched with the lifting unit adjusting nut and the second lifting unit adjusting screw in the circumferential direction, the second adjusting unit is matched with the lifting unit adjusting screw in the circumferential direction, when the adjusting unit moves, the adjusting nut is driven to rotate, when the second adjusting unit moves, the adjusting screw is driven to rotate, and further the adjusting unit or the second adjusting unit is adjusted to move, the adjusting nut or the adjusting screw is driven to move, so that the adjusting screw is driven to do linear feeding movement, and the height of a workpiece contacted with the adjusting screw is adjusted.)

1, leveling anchor clamps, characterized by, include:

the lifting device comprises an lifting unit, a lifting unit, a second lifting unit, a third lifting unit, a fourth lifting unit, a fifth lifting unit, a sixth lifting unit and a sixth lifting unit, wherein the lifting unit comprises a lifting unit supporting seat, an adjusting nut and an adjusting screw rod, the circumferential direction of the adjusting nut is matched with the lifting unit supporting seat, the adjusting screw rod respectively penetrates through the lifting unit supporting seat and the adjusting nut, and the circumferential direction of the adjusting screw rod is matched with the adjusting nut;

an th adjustment unit, the th adjustment unit mating with the th lifting unit adjustment nut and a second lifting unit adjustment screw circumferentially;

a second adjusting unit which is matched with the circumference of the lifting unit adjusting screw rod.

2. The leveling fixture according to claim 1, wherein the leveling fixture comprises two th lifting units, the end of the second adjusting unit is engaged with the circumference of the adjusting screw of th th lifting unit, and the other end of the second adjusting unit is engaged with the circumference of the adjusting screw of the other th th lifting unit.

3. The leveling jig of claim 2, wherein a direction defining a connection line between the two th lifting units is a th direction, and a direction defining an extension direction of the second adjusting unit is a second direction, the second direction is tangential to the adjusting screws of the two th lifting units, respectively, and the second direction intersects with or is out of plane with the th direction.

4. The leveling fixture of claim 3, further comprising a third adjustment unit, the third adjustment unit cooperating with the second adjustment unit, and a circumference of the third adjustment unit being tangential to the second direction.

5. The leveling fixture according to claim 1, wherein the adjusting nut of the adjusting unit comprises a screw hole for matching the adjusting screw, the adjusting nut is provided with threads in the circumferential direction and the hole, the adjusting nut is in threaded connection with the lifting unit supporting seat in the circumferential direction, the adjusting screw is in threaded connection with the screw hole of the adjusting nut, the adjusting screw of the second adjusting unit is in threaded connection with the second lifting unit supporting seat in the circumferential direction, and the adjusting screw is in threaded connection with the second lifting unit supporting seat in the circumferential direction.

6. The leveling fixture according to claim 2, wherein the th lifting unit adjusting nut is provided with a th gear near the 0 end of the th adjusting unit, the second lifting unit adjusting screw is provided with a fifth gear near the end of the th adjusting unit, the th lifting unit adjusting screw is provided with a second gear near the end of the second adjusting unit, the th lifting unit adjusting nut and the second lifting unit adjusting screw are engaged with the th adjusting unit through gears, and the th lifting unit adjusting screw is also engaged with the second adjusting unit through gears.

7. The leveling fixture according to claim 1, wherein the leveling fixture comprises two th lifting units, the th adjusting unit comprises two adjusting arms, the extending directions of the two adjusting arms are parallel, the two adjusting arms are respectively matched with the same side of the th lifting unit adjusting nuts, and moving arms are matched with the opposite side of the second lifting unit adjusting screw.

8. The leveling jig according to claim 7, wherein the th adjusting unit further comprises a moving arm connected to the two adjusting arms, respectively, and extending directions of the moving arms are parallel to the extending directions of the two adjusting arms, respectively, and both sides of the moving arm are engaged with the fourth adjusting unit and the second lifting unit, respectively.

9. The leveling jig of claim 8, further comprising a fourth adjusting unit and a second lifting unit, the fourth adjusting unit and the second lifting unit being disposed at both sides of the moving arm, and a circumferential direction of the fourth adjusting unit and the second lifting unit and the adjusting unit being tangential to an extending direction of the moving arm.

10, leveling clamp control method, characterized by comprising:

providing a leveling fixture as claimed in at least any one of claims 1 to 9 at ;

the th lifting unit is rotated in the same direction, the adjusting nuts of the two leveling fixtures are rotated in the same direction, and the adjusting screws of at least two leveling fixtures move in the same direction along the axis direction of the adjusting screws;

the th lifting unit is rotated in different directions to adjust the screw rods of the two leveling fixtures, and the adjusting screw rods of at least two leveling fixtures move reversely along the axis direction of the adjusting screw rods;

adjusting nuts and adjusting screws of the two leveling fixtures of the th lifting unit are respectively adjusted in the same direction, and adjusting screws of the two leveling fixtures of the th lifting unit and the second lifting unit move in opposite directions along the axis direction of the adjusting screws;

adjusting screws of two adjacent leveling fixtures are respectively adjusted in a reverse direction, and the adjusting screws of the two adjacent leveling fixtures move in a reverse direction along the axis direction of the adjusting screws.

Technical Field

The invention relates to the field of tool fixtures, in particular to leveling fixtures and a control method thereof.

Background

In the process of machine manufacturing and machining, a casting part is often required to be clamped and fixed so as to facilitate the machining procedures of milling, drilling, boring, turning and the like, when a non-standard part is required to be machined, the workpiece is often required to be clamped, leveled and adjusted in tool, and the posture and precision of the workpiece are not convenient to adjust after the clamping of the conventional clamp is completed, so that the machining and the production are not convenient.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide leveling fixtures and a control method thereof, which are used for solving the problem that the fixtures in the prior art are inconvenient for leveling workpieces.

In order to achieve the above and other related objects, the invention provides leveling fixtures, which comprise a th lifting unit, a 3526 th lifting unit, a second lifting unit, a th adjusting unit, a th adjusting unit, a th lifting unit adjusting nut and an th lifting unit adjusting screw, wherein the th lifting unit comprises a th lifting unit supporting seat, an adjusting nut and an adjusting screw, the circumferential direction of the adjusting nut is matched with the th lifting unit supporting seat, the adjusting screw respectively penetrates through the th lifting unit supporting seat and the adjusting nut, and the circumferential direction of the adjusting screw is matched with the adjusting nut, the second lifting unit comprises a second lifting unit supporting seat and an adjusting screw, the adjusting screw penetrates through the second lifting unit supporting seat, the circumferential direction of the adjusting screw is matched with the second lifting unit supporting seat, the th adjusting unit is matched with the th lifting unit adjusting nut and the circumferential direction of the second lifting unit adjusting screw, and.

Optionally, the leveling fixture comprises two th lifting units, wherein the end of the second adjusting unit is matched with the circumferential direction of the adjusting screw rod of the st lifting unit , and the other end of the second adjusting unit is matched with the circumferential direction of the adjusting screw rod of the other st th lifting unit.

Optionally, a direction of a connection line between the two th lifting units is defined as a th direction, an extending direction of the second adjusting unit is defined as a second direction, the second direction is respectively tangent to the adjusting screws of the two th lifting units, and the second direction intersects with or is out of plane with the th direction.

Optionally, the leveling fixture further includes a third adjusting unit, the third adjusting unit is matched with the second adjusting unit, and the circumference of the third adjusting unit is tangential to the second direction.

Optionally, the adjusting nut of the th adjusting unit comprises a screw hole used for being matched with the adjusting screw rod, threads are arranged in the circumferential direction and the hole of the adjusting nut, the circumferential direction of the adjusting nut is in threaded connection with the th lifting unit supporting seat, the adjusting screw rod is in threaded connection with the screw hole of the adjusting nut, threads are arranged in the circumferential direction of the adjusting screw rod of the second adjusting unit, and the circumferential direction of the adjusting screw rod is in threaded connection with the second lifting unit supporting seat.

Optionally, the th lifting unit adjusting nut is close to the 0 end of the th adjusting unit is provided with a th gear, the second lifting unit adjusting screw is close to the end of the th adjusting unit is provided with a fifth gear, the th lifting unit adjusting screw is close to the end of the second adjusting unit is provided with a second gear, the th lifting unit adjusting nut and the second lifting unit adjusting screw with the th adjusting unit pass through gear engagement, and the th lifting unit adjusting screw with the second adjusting unit also passes through gear engagement.

Optionally, the leveling anchor clamps include two lifting unit, adjusting unit includes two regulating arms, two the extending direction of regulating arm is parallel, and two the regulating arm respectively with two lifting unit adjusting nut's homonymy cooperation, and motion arm with the cooperation of second lifting unit adjusting screw heteropleural.

Optionally, the th adjusting unit further includes a moving arm, the moving arm is connected to the two adjusting arms, the extending direction of the moving arm is parallel to the extending direction of the two adjusting arms, and two sides of the moving arm are respectively matched with the fourth adjusting unit and the second lifting unit.

Optionally, the leveling fixture further includes a fourth adjusting unit and a second lifting unit, the fourth adjusting unit and the second lifting unit are disposed on two sides of the moving arm, and the circumferential directions of the fourth adjusting unit and the second lifting unit are tangent to the extending direction of the moving arm through the th adjusting unit.

leveling clamp control method includes providing the leveling clamp, rotating adjusting nuts of two leveling clamps of a th lifting unit in the same direction, enabling adjusting screws of at least two leveling clamps to move in the same direction along the axis direction of the leveling clamps, rotating adjusting screws of two leveling clamps of a th lifting unit in different directions, enabling adjusting screws of at least two leveling clamps to move in opposite directions along the axis direction of the leveling clamps, respectively adjusting the adjusting nuts of two leveling clamps of the th lifting unit in the same direction and the adjusting screws of a second lifting unit, enabling the adjusting screws of two groups of leveling clamps of the th lifting unit and the second lifting unit to move in opposite directions along the axis direction of the leveling clamps, respectively adjusting the adjusting screws of two adjacent leveling clamps in opposite directions, and enabling the adjusting screws of two adjacent leveling clamps to move in opposite directions along the axis direction of the leveling clamps.

As described above, the leveling jig and the control method thereof of the present invention have the following advantageous effects:

when the th adjusting unit moves, the th lifting unit adjusting nut and the second lifting unit adjusting screw are driven to rotate, when the second adjusting unit moves, the th lifting unit adjusting screw is driven to rotate, the th adjusting unit or the second adjusting unit is adjusted to move, the adjusting nut or the adjusting screw is driven to move, finally, the adjusting screw is enabled to do linear feeding movement, and the height of the adjusting screw contacting with a workpiece is adjusted.

Drawings

Fig. 1 is a schematic front view of a leveling fixture according to an embodiment of the present invention.

Fig. 2 is a left side view of the structure of fig. 1.

Fig. 3 is a schematic top view of the structure of fig. 1.

Fig. 4 is a schematic top view of another portion of fig. 1.

Fig. 5 is a schematic structural diagram of a second adjusting unit.

Fig. 6 is a schematic structural view of an th lifting unit.

Fig. 7 is a schematic structural diagram of a third adjusting unit.

Fig. 8 is a schematic structural diagram of a fourth adjusting unit.

Fig. 9 is a schematic structural view of the second lifting unit.

Fig. 10 is a schematic structural diagram of an th regulating unit.

Fig. 11 is a schematic diagram showing the relationship between the same-direction lifting of the th lifting unit and the reverse lifting of the second lifting unit.

Fig. 12 is a schematic diagram showing the motion relationship of the th lifting unit in reverse lifting.

Description of reference numerals

1 case body

11 clamp base

12 clamp cover plate

13 support rod

14 double-head screw

15 locating block

16 pressing plate

2 second regulating unit

20 second adjusting unit adjusting rod

21 second adjusting unit mounting seat

22 th th rack

23 second rack

3 st lifting unit

31 st lifting unit support base

32 adjusting nut

33 adjusting screw

34 th th gear

35 second gear

4 third regulating unit

41 third adjusting shaft

42 third gear

43 third adjusting unit connecting plate

5 fourth regulating Unit

51 fourth adjusting unit adjusting shaft

52 fourth gear

53 fourth regulating unit connecting plate

6 second lifting Unit

61 second lifting unit support base

62 second lifting unit adjusting screw

63 fifth gear

7 th regulating unit

71 third rack

72 adjusting arm

73 arm for exercise

74 fourth rack

75 fifth rack

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It should be noted that, referring to fig. 1 to 12, the drawings provided in the present embodiment are only schematic and only show the components related to the present invention, rather than being drawn according to the number, shape and size of the components in actual implementation, the type, number and proportion of each component may be random changes in actual implementation, and the layout of the components may be more complex.

Referring to fig. 1 to 4 and 6, the leveling clamp provided by the present invention includes an lifting unit 3, the th lifting unit 3 includes a th lifting unit support seat 31, an adjusting nut 32 and an adjusting screw 33, the adjusting nut 32 circumferentially cooperates with the th lifting unit support seat 31, when the adjusting nut 32 rotates, the adjusting nut 32 axially moves relative to the th lifting unit support seat 31 in a linear motion, so as to drive the adjusting screw 33 cooperating with the adjusting nut 32 to linearly move, the adjusting screw 33 respectively penetrates through the th lifting unit support seat 31 and the adjusting nut 32, and the circumferential direction of the adjusting screw 33 cooperates with the adjusting nut 32, when the adjusting screw 33 rotates, the adjusting screw 33 can drive the adjusting screw 33 and the adjusting nut 32 to relatively move, so as to drive the adjusting screw 33 axially move linearly, the th adjusting unit 7, the th adjusting unit 7 circumferentially cooperates with the adjusting nut 32, when the second adjusting unit 2, the second adjusting unit 2 contacts with the adjusting screw 33, so as to drive the adjusting screw 33 to linearly move circumferentially, and drive the adjusting screw 33 to drive the adjusting unit 33 to move linearly, when the adjusting screw 33 circumferentially or drives the adjusting screw 33 to rotate, so as to drive the adjusting unit to feed the adjusting screw 33 to move linearly.

The adjusting clamp further comprises a box body 1 which consists of 6 parts, a clamp base 11 is arranged on a machine tool workbench and shares the functions of part unit installation and workpiece pressing with a clamp cover plate 12 , and a supporting rod 13, a double-thread screw 14, a pressing plate 16 and a V-shaped positioning block 15 are arranged on the clamp cover plate 12 and play a role in pressing and positioning a workpiece.

In the course of the specific implementation,

referring to fig. 3, 5 and 6, the leveling fixture includes two second lifting units 3, an end of the second adjusting unit 2 is circumferentially engaged with an adjusting screw of a second 1 lifting unit 3, another end of the second adjusting unit 2 is circumferentially engaged with an adjusting screw of another third fourth lifting unit 3, specifically, a direction of a connecting line between the two second 5 lifting units 3 is defined as a second direction, an extending direction of the second adjusting unit 2 is defined as a second direction, the second direction is tangent to the adjusting screws of the two second lifting units, and the second direction is intersected with or out of plane with the second direction, when the second adjusting unit 2 rotates, two ends of the second adjusting unit 2 move and then respectively move relative to the adjusting screws of the two second lifting units 3, rotation directions of the adjusting screws of the two second lifting units 3 of the adjusting screws are opposite, and then directions of the adjusting screws of the two adjusting screws are opposite, and thus respectively move relative to the adjusting screw of the adjusting rack of the two lifting units 3, the adjusting unit 20 and the adjusting rack adjusting unit 20 is mounted on two adjusting racks 20 and a mounting base 3621 of the adjusting unit 20, and a mounting base 20 for mounting a workpiece mounting unit 20, a mounting rack mounting unit 20 for mounting a rack 20, a rack mounting unit 20, a rack 21, a rack mounting unit 20, a rack 21, a rack mounting unit 20, a rack 21, a rack mounting unit 20, a rack 21.

Referring to fig. 7, in order to facilitate adjustment of the movement of the second adjusting unit 2, the leveling fixture further includes a third adjusting unit 4, the third adjusting unit 4 is matched with the second adjusting unit 2, and the circumferential direction of the third adjusting unit 4 is tangential to the second direction (i.e. the extending direction of the second adjusting unit), when the third adjusting unit 4 is rotated, the second adjusting unit 2 moves along the plane where the second direction is located, and the second adjusting unit 2 drives the third lifting unit 3 to rotate, in a specific implementation process, the third adjusting unit 4 includes a third adjusting shaft 41, a third gear 42 and a third adjusting unit connecting plate 43, the third adjusting unit connecting plate 43 may be connected with the fixture base 11, the third adjusting shaft 41 and the third adjusting unit connecting plate 43 are rotatably connected in a shaft/hole manner, and the third gear 42 is disposed on the third adjusting shaft 41, and the third adjusting shaft 41 may drive the third gear 42 to rotate, so as to further achieve adjustment and control of the second adjusting unit 2 by the third adjusting unit 4, and in an implementation process, the adjustment accuracy of the lifting unit is achieved by the third adjusting shaft 41 being connected with the adjusting unit.

Referring to fig. 6, the adjusting nut 32 includes a screw hole for engaging with the adjusting screw 33, threads are disposed in the circumferential direction and the hole of the adjusting nut 32, the circumferential direction of the adjusting nut 32 is in threaded connection with the th lifting unit supporting seat 31, and the adjusting screw 33 is in threaded connection with the screw hole of the adjusting nut 32, that is, in an actual use process, when the adjusting nut 32 is rotated, the adjusting nut 32 is in threaded engagement with the th lifting unit supporting seat 31, the adjusting nut 32 can perform a feeding motion relative to the th lifting unit supporting seat 31, and when the adjusting screw 33 is rotated, the adjusting screw 33 is in threaded engagement with the adjusting nut 32, and the adjusting screw 33 can perform a feeding motion relative to the adjusting nut 32, thereby achieving a feeding motion of the top of the adjusting screw and achieving a purpose of adjusting a relative position of a workpiece.

In the specific implementation process, the end of the adjusting nut 32 close to the adjusting unit 7 is provided with a gear 34, the end of the adjusting screw 33 close to the second adjusting unit 2 is provided with a second gear 35, the adjusting nut 32 is meshed with the adjusting unit 7 through a gear, the adjusting screw 33 is meshed with the second adjusting unit 2 through a gear, the adjusting nut 32 is rotated through the adjusting unit 7, the adjusting screw 33 is rotated through the second adjusting unit 2, the feeding motion of the top of the adjusting screw 33 is realized, and the purpose of adjusting the relative position of the workpieces is achieved.

Referring to fig. 10 and 11, in order to adjust the height and the levelness of the workpiece, the leveling fixture includes two th lifting units 3, the th adjusting unit 7 includes two adjusting arms 72, the extending directions of the two adjusting arms 72 are parallel, the two adjusting arms 72 are respectively matched with the same side of the adjusting nut 32, meanwhile, the moving arm 73 is matched with the same side of the adjusting screw 62 of the second lifting unit, when the th adjusting unit 7 moves along the extending direction of the adjusting unit 72, the th adjusting unit 7 drives the two th lifting units 3 to rotate in the same direction, so as to achieve the synchronous lifting or lowering of the two th lifting units 3 and the lowering or lifting of the second lifting unit.

In order to control the motion of the th adjustment unit 7, the th adjustment unit 7 further includes a motion arm 73, the motion arm 73 is respectively connected to the two adjustment arms 72, and the extension direction of the motion arm 73 is respectively parallel to the extension direction of the two adjustment arms, so that the motion arm 73 is driven to perform linear motion, that is, the two adjustment arms 72 are simultaneously driven to move, thereby realizing the adjustment synchronization of the th lifting unit 3 and the adjustment of the second lifting unit 6 opposite to the th lifting unit 3.

In order to facilitate the control of the moving arm 73, the leveling fixture further includes a fourth adjusting unit 5 and a second lifting unit 6, the fourth adjusting unit 5 and the second lifting unit 6 are respectively disposed on two sides of the moving arm 73, and a circumferential direction of the fourth adjusting unit 5 and a circumferential direction of the second lifting unit 6 are respectively tangent to an extending direction of the moving arm 73, a linear feeding motion of the fourth adjusting unit 7 is realized by adjusting the fourth adjusting unit 5, so as to ensure a linearity and a precision of a motion of the adjusting unit 7, in a specific implementation process, a third rack 71 is disposed at a end where the adjusting arm 72 is engaged with the fourth lifting unit 3, a fourth rack 74 and a fifth rack 75 are respectively disposed at positions where the moving arm 73 corresponds to the fourth adjusting unit 5 and the second lifting unit 6, by rotating the fourth adjusting unit 5, the fourth adjusting unit 5 is engaged with the fourth rack 74 to drive the fourth adjusting unit 5 to drive the fourth rack 74 to realize a motion of the moving arm 73, specifically, please refer to fig. 8 and fig. 9, the fourth adjusting unit 5 includes a fourth adjusting unit 52 and a fifth adjusting screw 52, and a fifth adjusting unit 52, and a fifth lifting unit 52 are disposed on a lifting unit 52, and a lifting unit 52, and a lifting unit are connected to realize a lifting unit, and a lifting unit 52, and a lifting unit 52, and a lifting unit, and.

Referring to fig. 11 and 12, the present invention further provides leveling fixture control methods, including:

at least two th lifting units are provided, and in order to maintain the levelness of the workpiece, the implementation process adopts two th lifting units and second lifting units;

the adjusting nuts 32 of the th lifting units of the two leveling clamps and the adjusting screws 62 of the second lifting units rotate in the same direction, the adjusting nuts 32 of the th lifting units are matched with the adjusting screws 33, when the adjusting nuts 32 rotate, the adjusting screws 33 can be driven to move linearly, the adjusting screws 33 of the th lifting units of the two leveling clamps move in the same direction along the axis direction of the two leveling clamps, the adjusting screws 62 of the second lifting units are matched with the supporting seats 61 of the second lifting units, the adjusting screws 62 of the second lifting units of the leveling clamps move in the opposite direction of the adjusting screws 33 of the th lifting units along the axis direction of the two leveling clamps, and therefore synchronous lifting of the th lifting units and synchronous lifting of the second lifting units are achieved;

(two adjusting screws 33 of the leveling clamps rotate in the same direction, the adjusting nuts 32 are matched with the adjusting screws 33, when the adjusting screws 33 rotate, the adjusting screws 33 perform linear motion relative to the adjusting nuts 32, and then the adjusting screws 33 of the two leveling clamps perform the same-direction motion along the axis direction of the adjusting screws, so that the synchronous lifting of the lifting units is realized; the clamp can realize the height adjustment of the workpiece in the transverse direction only by reversely adjusting the adjusting screw of the lifting unit)

Similarly, (the adjusting nuts 32 of two adjacent leveling clamps are respectively adjusted in opposite directions, the adjusting screws 33 of the two adjacent leveling clamps perform opposite movement along the axis direction of the adjusting screws, so that lifting units of are lifted or lowered, and meanwhile, the other lifting units of are lowered or raised, which indicates that only the adjusting nuts of the lifting units are adjusted in the same direction in the clamp, so that the longitudinal height of the workpiece can be adjusted), the adjusting screws 33 of the two adjacent leveling clamps are respectively adjusted in opposite directions, the adjusting screws 33 of the two adjacent leveling clamps perform opposite movement along the axis direction of the adjusting screws, so that lifting units of are lifted or lowered, and meanwhile, the other lifting units of are lowered or raised.

In the specific implementation process, referring to fig. 11, when the fourth adjusting unit 5 rotates, the th adjusting unit 7 can be driven to generate a feeding motion, the th adjusting unit 7 is matched with the same sides of the adjusting nuts 32 of the two th lifting units, and further when the th adjusting unit 7 feeds, the same sides of the two adjusting nuts 32 generate a relative motion in the same direction, and then the two adjusting nuts 32 drive the adjusting screw 33 to simultaneously lift or lower, and simultaneously generate a relative motion with the fifth gear 63 of the second lifting unit 6, so as to drive the adjusting screw 62 to simultaneously lift or lower.

Please refer to fig. 12, when the third adjusting unit 4 rotates, the third adjusting unit 4 can be matched with the second adjusting unit 2, and then two ends of the second adjusting unit 2 are respectively matched with the two adjusting screws 33, because the connection line position relationship between the extending direction of the second adjusting unit 2 and the two th lifting units is intersecting or non-coplanar, the second adjusting unit 2 can drive the two th lifting units to move reversely, so that th lifting units are lifted or lowered, and th lifting units are lowered or lifted.

It will be appreciated by those skilled in the art that modifications and variations can be made to the disclosed embodiments without departing from the spirit and scope of the invention, and therefore, is equivalent to modifications and variations that would be apparent to those skilled in the art without departing from the spirit and scope of the invention as disclosed in the appended claims.