CN216707436U - Novel dynamic balance test assembly platform device - Google Patents

Abstract

The utility model provides a novel dynamic balance test assembly platform device, which comprises a bracket, a first supporting seat, a second supporting seat, a lifting plate, a lifting mechanism, a transmission mechanism, a first movable clamp and a second movable clamp, the support comprises four frames of the table top, four support columns and a support frame, the support columns are all fixed at the bottom of the four frames of the table top, the supporting frame is fixed in the middle between the four supporting columns, the lifting mechanism and the transmission mechanism are both fixed on the supporting frame, the lifting plate is fixed at the top end of the moving part of the lifting mechanism, and the first supporting seat and the second supporting seat are fixed on the top surface of the lifting plate.

Description

Novel dynamic balance test assembly platform device

Technical Field

The utility model belongs to the field of assembly equipment, and particularly relates to a novel dynamic balance test assembly platform device.

Background

The coupling is a device for connecting two shafts or a shaft and a rotating part, rotating together in the process of transmitting motion and power and not separating under normal conditions. The dynamic balance of the coupler refers to the state of the coupler deviating from the centrifugal force of a transmission shafting at two ends when the coupler operates, and the precision index of the dynamic balance of the coupler is strictly controlled by a high-quality coupler, so that the dynamic balance of the coupler needs to be detected after the coupler is produced, the dynamic balance detection generally comprises the steps of firstly respectively installing clamps at two ends of the coupler, then fixing the clamps on a dynamic balance testing machine for operation testing, and at present, in the process of assembling the clamps, workers need to squat down to assemble the clamps on the coupler, so that the workers are hard, and the assembly efficiency is low.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a novel dynamic balance test assembly platform device, which solves the problems that workers need to squat down when a dynamic balance test fixture is assembled at two ends of a coupler at present and the assembly efficiency is low.

The utility model provides a novel dynamic balance test assembly platform device which comprises a support, a first supporting seat, a second supporting seat, a lifting plate, a lifting mechanism, a transmission mechanism, a first movable clamp, a second movable clamp, a first front sliding block, a first rear sliding block, a second front sliding block, a second rear sliding block, a first guide shaft and a second guide shaft, wherein the support comprises a table top four-side frame, four supporting columns and a supporting frame, the supporting columns are all fixed at the bottom of the table top four-side frame, the supporting frame is fixed at the middle position among the four supporting columns, the lifting mechanism and the transmission mechanism are all fixed on the supporting frame, the lifting plate is fixed at the top end of a moving part of the lifting mechanism, the first supporting seat and the second supporting seat are respectively fixed at two ends of the top surface of the lifting plate, the first guide shaft and the second guide shaft are respectively fixed on two parallel frame edges of the table top four-side frame, the first front sliding block and the first rear sliding block are respectively sleeved at one end of the first guide shaft and one end of the second guide shaft, the second front sliding block and the second rear sliding block are respectively sleeved at the other end of the first guide shaft and the other end of the second guide shaft, the first movable clamp is fixed on the first front sliding block and the first rear sliding block, the second movable clamp is fixed on the second front sliding block and the second rear sliding block, and a connecting line of the first movable clamp and the second movable clamp is parallel to the axial direction of the first guide shaft.

Further, the lifting mechanism includes four worm gear lead screw lifters, a body of each worm gear lead screw lifter is fixed on a corner of the supporting frame, the transmission mechanism includes a first speed reducer, a second speed reducer and five connecting shafts, the worm gear lead screw lifter includes a lifting lead screw, a top end of the lifting lead screw is fixed with the lifting plate, the first speed reducer and the second speed reducer are fixed at positions close to mutually parallel frames of the supporting frame respectively, the first speed reducer includes a three-way output shaft, two opposite output shafts of the first speed reducer are fixed with input shafts of the worm gear lead screw lifters at two sides of the first speed reducer respectively through one of the connecting shafts, the other output shaft of the first speed reducer is fixed with an input shaft of the second speed reducer, the second speed reducer includes two-way output shafts, two opposite output shafts of the second speed reducer are respectively fixed with the input shafts of the turbine screw rod lifters on two sides of the second speed reducer through one connecting shaft.

Furthermore, a hand wheel is fixed at the free end of the input shaft of the first speed reducer.

Furthermore, the first movable clamp comprises a first bottom plate, a first front side plate, a first rear side plate, a first fixing ring, a first upper backing plate, a first lower backing plate and a first clamping cylinder, the first front side plate and the first rear side plate are respectively and vertically fixed at the front end and the rear end of the first bottom plate, two sides of the first fixing ring are simultaneously fixed on the first front side plate and the first rear side plate, a cylinder body of the first clamping cylinder is fixed at the top of the first fixing ring, a piston of the first clamping cylinder penetrates through the first fixing ring and is fixed with the first upper backing plate, and the first lower backing plate is fixed with the lower half part of the inner side surface of the first fixing ring; the second movable clamp comprises a second bottom plate, a second front side plate, a second rear side plate, a second fixing ring, a second upper backing plate, a second lower backing plate and a second clamping cylinder, the second front side plate and the second rear side plate are respectively and vertically fixed at the front end and the rear end of the second bottom plate, the two sides of the second fixing ring are simultaneously fixed on the second front side plate and the second rear side plate, a cylinder body of the second clamping cylinder is fixed at the top of the second fixing ring, a piston of the second clamping cylinder penetrates through the second fixing ring and the second upper backing plate, and the second lower backing plate is fixed with the lower half part of the inner side face of the second fixing ring.

Furthermore, the first supporting seat comprises a first connecting plate, a first triangular plate and a second triangular plate, the first triangular plate and the second triangular plate are vertically fixed on the first connecting plate, the bevel edges of the first triangular plate and the second triangular plate are opposite to each other, and a V-shaped opening is formed between the first triangular plate and the second triangular plate; the second supporting seat comprises a second connecting plate, a third triangular plate and a fourth triangular plate, the third triangular plate and the fourth triangular plate are vertically fixed on the second connecting plate, the third triangular plate and the bevel edge of the fourth triangular plate are opposite to each other, and a V-shaped opening is formed between the third triangular plate and the fourth triangular plate.

Furthermore, the bottom of each support column is provided with a universal wheel.

Furthermore, a first guide rail and a second guide rail which are parallel to each other are fixed on the top surface of the lifting plate, the first guide rail and the second guide rail are close to the front side and the rear side of the top surface of the lifting plate respectively, the axial direction of the first guide rail and the axial direction of the first guide shaft are arranged, a third front sliding block and a third rear sliding block are fixed on the front side and the rear side of the bottom of the first connecting plate respectively, a fourth front sliding block and a fourth rear sliding block are fixed on the front side and the rear side of the bottom of the second connecting plate respectively, the third front sliding block and the third rear sliding block are sleeved at the left ends of the first guide rail and the second guide rail respectively, and the fourth front sliding block and the fourth rear sliding block are sleeved at the right ends of the first guide rail and the second guide rail respectively.

The utility model has the following beneficial effects:

the coupler can be erected on the first supporting seat and the second supporting seat, then the two clamps are respectively fixed on the first movable clamp and the second movable clamp, then the first movable clamp and the second movable clamp are shifted to be drawn close to each other until each clamp is correspondingly abutted against one end of the coupler, then each clamp is fixed with the end part of the coupler correspondingly abutted against the clamp, finally the first movable clamp and the clamp fixed on the first movable clamp are loosened, and the second movable clamp and the clamp fixed on the second movable clamp are loosened.

Drawings

FIG. 1 is a first overall schematic view of a novel dynamic balance test assembly platform assembly of the present invention;

FIG. 2 is a second overall schematic view of a novel dynamic balance test assembly platform apparatus of the present invention;

FIG. 3 is an assembly view of the first support base, the second support base, the lifting mechanism, the lifting plate and the transmission mechanism according to the present invention;

FIG. 4 is a schematic overall view of the novel dynamic balance test assembly platform assembly of the present invention with the coupling removed;

fig. 5 is an assembly view of the lifter, lifter plate and actuator of the present invention.

In the above figures, 100, the bracket; 200. a first support base; 300. a second support seat; 400. a lifting plate; 700. a first movable clip; 800. a second movable clip; 900. a first front slider; 10. a first rear slider; 20. a second front slider; 30. a second rear slider; 40. a first guide shaft; 50. a second guide shaft; 110. four frames; 120. a support pillar; 130. a support frame; 510. a worm screw hoist; 511. a lifting screw rod; 610. a first speed reducer; 620. a second speed reducer; 630. a connecting shaft; 611. a hand wheel; 710. a first base plate; 720. a first front side plate; 730. a first rear side plate; 740. a first retainer ring; 750. a first upper backing plate; 760. a first lower backing plate; 770. a first clamping cylinder; 810. a second base plate; 820. a second front side panel; 830. a second rear side plate; 840. a second retainer ring; 850. a second upper backing plate; 860. a second lower backing plate; 870. a second clamping cylinder; 210. a first connecting plate; 220. a first set square; 230. a second set square; 310. a second connecting plate; 320. a third set square; 330. a fourth set square; 121. a universal wheel; 60. a first guide rail; 70. a second guide rail; 80. a third front slider; 90. a third rear slider; 1. a fourth front slider; 2. a fourth rear slider; 3. a clamp; 4. a coupling is provided.

Detailed Description

The technical solution of the present invention will be further explained with reference to fig. 1-5 and the examples.

The utility model provides a novel dynamic balance test assembly platform device, which comprises a support 100, a first support seat 200, a second support seat 300, a lifting plate 400, a lifting mechanism, a transmission mechanism, a first movable clamp 700, a second movable clamp 800, a first front slide block 900, a first rear slide block 10, a second front slide block 20, a second rear slide block 30, a first guide shaft 40 and a second guide shaft 50, wherein the support 100 comprises a table top four-side frame 110, four support columns 120 and a support frame 130, the support columns 120 are all fixed at the bottom of the table top four-side frame 110, the support frame 130 is fixed at the middle position among the four support columns 120, the lifting mechanism and the transmission mechanism are all fixed on the support frame 130, the lifting plate 400 is fixed at the top end of a moving part of the lifting mechanism, the first support seat 200 and the second support seat 300 are respectively fixed at two ends of the top surface of the lifting plate 400, the first guide shaft 40 and the second guide shaft 50 are respectively fixed on two parallel frame edges of the table top four-side frame 110, the first front sliding block 900 and the first rear sliding block 10 are respectively sleeved at one end of the first guide shaft 40 and one end of the second guide shaft 50, the second front sliding block 20 and the second rear sliding block 30 are respectively sleeved at the other end of the first guide shaft 40 and the other end of the second guide shaft 50, the first movable clamp 700 is fixed on the first front sliding block 900 and the first rear sliding block 10, the second movable clamp 800 is fixed on the second front sliding block 20 and the second rear sliding block 30, and a connecting line of the first movable clamp 700 and the second movable clamp 800 is parallel to the axial direction of the first guide shaft 40.

Firstly, two ends of a coupler 4 are respectively erected on a first supporting seat 200 and a second supporting seat 300, then a clamp 3 is temporarily fixed on a first movable clamp 700 and a second movable clamp 800 respectively, the two clamps 3 are fixed on a movable frame and then are in coaxial relation with the coupler 4, then the first movable clamp 700 is moved towards one end of the coupler 4 until the clamp 3 on the first movable clamp abuts against the coupler 4, the second movable clamp 800 is moved towards the other end of the coupler 4 until the clamp 3 on the second movable clamp abuts against the coupler 4, then the two clamps 3 are respectively fixed at two ends of the coupler 4, and finally the two clamps 3 are respectively loosened from the first movable clamp 700 and the second movable clamp 800.

Because the diameters of the couplers 4 have different scales, when the coupler 4 with a larger diameter is erected on the first supporting seat 200 and the second supporting seat 300, the center of the coupler 4 moves upwards, and in order to match with the height of the center of the clamp 3, the height of the coupler 4 needs to be moved downwards, the height of the coupler 4 is reduced by moving the lifting plate 400 downwards, when the coupler 4 with a smaller diameter is erected on the first supporting seat 200 and the second supporting seat 300, the center of the coupler 4 moves downwards, and in order to match with the height of the center of the clamp 3, the height of the coupler 4 needs to be moved downwards, and the height of the coupler 4 is reduced by lowering the lifting plate 400.

Specifically, the lifting mechanism includes four worm gear lead screw lifters 510, a body of each worm gear lead screw lifter 510 is respectively fixed on a corner of the supporting frame 130, the transmission mechanism includes a first speed reducer 610, a second speed reducer 620 and five connecting shafts 630, the worm gear lead screw lifters 510 includes lifting lead screws 511, top ends of the lifting lead screws 511 are fixed with the lifting plate 400, the first speed reducer 610 and the second speed reducer 620 are respectively fixed on positions close to mutually parallel side frames of the supporting frame 130, the first speed reducer 610 includes three-way output shafts, two opposite output shafts of the first speed reducer 610 are respectively fixed with input shafts of the worm gear lead screw lifters 510 on two sides of the first speed reducer 610 through one connecting shaft 630, the other output shaft of the first speed reducer 610 is fixed with an input shaft of the second speed reducer 620, the second speed reducer 620 includes two-way output shafts, two opposite output shafts of the second speed reducer 620 are respectively fixed with the worm gear lead screws on two sides of the second speed reducer 620 through one connecting shaft 630 The input shaft of the rod elevator 510 is fixed.

When the input shaft of the first speed reducer 610 is manually rotated in the forward direction, the three output shafts of the first speed reducer 610 rotate, so that the lead screws of the worm gear lead screw elevators 510 at the two sides of the first speed reducer 610 start to ascend, the input end of the second speed reducer 620 rotates, so that the lead screws of the worm gear lead screw elevators 510 at the two sides of the second speed reducer 620 start to ascend, and finally the lifting plate 400 ascends; after the input shaft of the first reducer 610 is manually rotated in the reverse direction, the lifting plate 400 moves downward.

To facilitate the effort-saving rotation of the input shaft of the first speed reducer 610, a hand wheel 611 is fixed to a free end of the input shaft of the first speed reducer 610.

Specifically, the first movable clamp 700 includes a first bottom plate 710, a first front side plate 720, a first rear side plate 730, a first retaining ring 740, a first upper backing plate 750, a first lower backing plate 760 and a first clamping cylinder 770, wherein the first front side plate 720 and the first rear side plate 730 are respectively and vertically fixed at the front end and the rear end of the first bottom plate 710, two sides of the first retaining ring 740 are simultaneously fixed on the first front side plate 720 and the first rear side plate 730, the cylinder body of the first clamping cylinder 770 is fixed at the top of the first retaining ring 740, the piston of the first clamping cylinder 770 penetrates through the first retaining ring 740 to be fixed with the first upper backing plate 750, and the first lower backing plate 760 is fixed with the lower half of the inner side surface of the first retaining ring 740; the second movable clamp 800 includes a second base plate 810, a second front plate 820, a second rear plate 830, a second retainer ring 840, a second upper plate 850, a second lower plate 860 and a second clamping cylinder 870, wherein the second front plate 820 and the second rear plate 830 are respectively and vertically fixed at the front and rear ends of the second base plate 810, both sides of the second retainer ring 840 are simultaneously fixed on the second front plate 820 and the second rear plate 830, a cylinder body of the second clamping cylinder 870 is fixed at the top of the second retainer ring 840, a piston of the second clamping cylinder 870 penetrates through the second retainer ring 840 to be fixed with the second upper plate 850, and the second lower plate 860 is fixed with the lower half part of the inner side surface of the second retainer ring 840.

Fixing the clamp 3 on the movable clamp: in an initial state, the piston of the first clamping cylinder 770 is in a shortened state, the distance between the first upper pad 750 and the second lower pad 860 is greater than the height of the clamp 3, the clamp 3 is put between the first upper pad 750 and the second lower pad 860, the hand plate valve is swung to extend the piston of the first clamping cylinder 770, so that the first upper pad 750 descends, and finally the clamp 3 is clamped between the first upper pad 750 and the first lower pad 760; the steps and the principle of fixing the clamp 3 to the second movable clamp 800 are identical to those of fixing the clamp 3 to the first movable clamp 700, and will not be described herein.

The first supporting seat 200 comprises a first connecting plate 210, a first triangular plate 220 and a second triangular plate 230, wherein the first triangular plate 220 and the second triangular plate 230 are vertically fixed on the first connecting plate 210, the inclined edges of the first triangular plate 220 and the second triangular plate 230 are opposite to each other, and a V-shaped opening is formed between the first triangular plate 220 and the second triangular plate 230; the second supporting seat 300 comprises a second connecting plate 310, a third triangular plate 320 and a fourth triangular plate 330, the third triangular plate 320 and the fourth triangular plate 330 are vertically fixed on the second connecting plate 310, the oblique sides of the third triangular plate 320 and the fourth triangular plate 330 are opposite to each other, a V-shaped opening is formed between the third triangular plate 320 and the fourth triangular plate 330, and two ends of the coupling 4 can be respectively erected in the V-shaped openings of the first supporting seat 200 and the second supporting seat 300.

The bottom of each supporting column 120 is provided with a universal wheel 121, and the universal wheels 121 can be conveniently moved.

The top surface of the lifting plate 400 is fixedly provided with a first guide rail 60 and a second guide rail 70 which are parallel to each other, the first guide rail 60 and the second guide rail 70 are respectively close to the front side and the rear side of the top surface of the lifting plate 400, the axial direction of the first guide rail 60 and the axial direction of the first guide shaft 40 are respectively, the front side and the rear side of the bottom of the first connecting plate 210 are respectively fixedly provided with a third front sliding block 80 and a third rear sliding block 90, the front side and the rear side of the bottom of the second connecting plate 310 are respectively fixedly provided with a fourth front sliding block 1 and a fourth rear sliding block 2, the third front sliding block 80 and the third rear sliding block 90 are respectively sleeved at the left ends of the first guide rail 60 and the second guide rail 70, and the fourth front sliding block 1 and the fourth rear sliding block 2 are respectively sleeved at the right ends of the first guide rail 60 and the second guide rail 70.

Since the axial length of the coupling 4 may be different, the distance between the first support 200 and the second support 300 may be adjusted to accommodate different axial lengths of the coupling 4. Specifically, when the axial length of the coupler 4 is small, the first supporting seat 200 and the second supporting seat 300 are manually shifted, and the first supporting seat 200 and the second supporting seat 300 are mutually closed; when the axial length of the coupler 4 is large, the first supporting seat 200 and the second supporting seat 300 are manually shifted, and the first supporting seat 200 and the second supporting seat 300 are far away from each other.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (7)

1. The novel dynamic balance test assembly platform device is characterized by comprising a support (100), a first supporting seat (200), a second supporting seat (300), a lifting plate (400), a lifting mechanism, a transmission mechanism, a first movable clamp (700), a second movable clamp (800), a first front sliding block (900), a first rear sliding block (10), a second front sliding block (20), a second rear sliding block (30), a first guide shaft (40) and a second guide shaft (50), wherein the support (100) comprises a table-board four-side frame (110), four supporting columns (120) and a supporting frame (130), the supporting columns (120) are all fixed at the bottom of the table-board four-side frame (110), the supporting frame (130) is fixed at the middle position among the four supporting columns (120), the lifting mechanism and the transmission mechanism are all fixed on the supporting frame (130), the lifting plate (400) is fixed at the top end of a moving part of the lifting mechanism, the first supporting seat (200) and the second supporting seat (300) are respectively fixed at two ends of the top surface of the lifting plate (400), the first guide shaft (40) and the second guide shaft (50) are respectively fixed on two parallel frame edges of the table top four-side frame (110), the first front sliding block (900) and the first rear sliding block (10) are respectively sleeved at one ends of the first guide shaft (40) and the second guide shaft (50), the second front sliding block (20) and the second rear sliding block (30) are respectively sleeved at the other ends of the first guide shaft (40) and the second guide shaft (50), the first movable clamp (700) is fixed on the first front sliding block (900) and the first rear sliding block (10), and the second movable clamp (800) is fixed on the second front sliding block (20) and the second rear sliding block (30), the connecting line of the first movable clamp (700) and the second movable clamp (800) is parallel to the axial direction of the first guide shaft (40).

2. A novel dynamic balance test assembly platform device according to claim 1, wherein the lifting mechanism comprises four worm screw lifters (510), the body of each worm screw lifter (510) is fixed on a corner of the supporting frame (130), the transmission mechanism comprises a first speed reducer (610), a second speed reducer (620) and five connecting shafts (630), the worm screw lifters (510) comprise lifting screw rods (511), the top ends of the lifting screw rods (511) are fixed with the lifting plate (400), the first speed reducer (610) and the second speed reducer (620) are respectively fixed at positions close to the parallel frames of the supporting frame (130), the first speed reducer (610) comprises three-way output shafts, and two opposite output shafts of the first speed reducer (610) are respectively connected with the worm screws on two sides of the first speed reducer (610) through one connecting shaft (630) The input shaft of the screw rod lifter (510) is fixed, the other output shaft of the first speed reducer (610) is fixed with the input shaft of the second speed reducer (620), the second speed reducer (620) comprises two output shafts in two directions, and the two opposite output shafts of the second speed reducer (620) are respectively fixed with the input shafts of the turbine screw rod lifter (510) on two sides of the second speed reducer (620) through one connecting shaft (630).

3. A novel dynamic balance test assembly platform device according to claim 2, characterized in that a hand wheel (611) is fixed at the free end of the input shaft of the first speed reducer (610).

4. The novel dynamic balance test assembly platform device of claim 1, wherein the first movable clamp (700) comprises a first bottom plate (710), a first front side plate (720), a first rear side plate (730), a first fixed ring (740), a first upper backing plate (750), a first lower backing plate (760) and a first clamping cylinder (770),

the first front side plate (720) and the first rear side plate (730) are respectively and vertically fixed at the front end and the rear end of the first bottom plate (710), two sides of the first fixing ring (740) are simultaneously fixed on the first front side plate (720) and the first rear side plate (730), the cylinder body of the first clamping cylinder (770) is fixed at the top of the first fixing ring (740), the piston of the first clamping cylinder (770) penetrates through the first fixing ring (740) to be fixed with the first upper backing plate (750), and the first lower backing plate (760) is fixed with the lower half part of the inner side surface of the first fixing ring (740); the second movable clamp (800) comprises a second bottom plate (810), a second front side plate (820), a second rear side plate (830), a second fixing ring (840), a second upper backing plate (850), a second lower backing plate (860) and a second clamping cylinder (870), the second front side plate (820) and the second rear side plate (830) are respectively and vertically fixed at the front end and the rear end of the second bottom plate (810), both sides of the second fixing ring (840) are fixed to the second front side plate (820) and the second rear side plate (830) at the same time, the cylinder body of the second clamping cylinder (870) is fixed on the top of the second fixing ring (840), the piston of the second clamping cylinder (870) penetrates the second fixing ring (840) to be fixed with the second upper backing plate (850), the second lower pad (860) is fixed to a lower half of an inner side surface of the second retainer ring (840).

5. The new dynamic balance test assembly platform device as recited in claim 1, wherein the first supporting seat (200) comprises a first connecting plate (210), a first triangular plate (220) and a second triangular plate (230), the first triangular plate (220) and the second triangular plate (230) are vertically fixed on the first connecting plate (210), the inclined sides of the first triangular plate (220) and the second triangular plate (230) are opposite to each other, and a V-shaped opening is formed between the first triangular plate (220) and the second triangular plate (230); second supporting seat (300) includes second connecting plate (310), third set square (320) and fourth set square (330), third set square (320) with fourth set square (330) vertical fixation is in on second connecting plate (310), third set square (320) with the hypotenuse of fourth set square (330) is mutually opposed, third set square (320) with constitute a V type mouth between the fourth set square (330).

6. A novel dynamic balance test assembly platform assembly, as claimed in claim 1, wherein a universal wheel (121) is provided at the bottom of each support column (120).

7. The novel dynamic balance test assembly platform device of claim 5, wherein the top surface of the lifting plate (400) is fixed with a first guide rail (60) and a second guide rail (70) which are parallel to each other, the first guide rail (60) and the second guide rail (70) are respectively close to the front side and the rear side of the top surface of the lifting plate (400), the axial direction of the first guide rail (60) and the axial direction of the first guide shaft (40) are respectively fixed with a third front slider (80) and a third rear slider (90) at the front side and the rear side of the bottom of the first connecting plate (210), the front side and the rear side of the bottom of the second connecting plate (310) are respectively fixed with a fourth front slider (1) and a fourth rear slider (2), and the third front slider (80) and the third rear slider (90) are respectively sleeved at the left ends of the first guide rail (60) and the second guide rail (70), the fourth front sliding block (1) and the fourth rear sliding block (2) are respectively sleeved at the right ends of the first guide rail (60) and the second guide rail (70).

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