US 2023/0347465 A1Published application

Unloading device and unloading method for gantry-type machining center beam guide rail

AssigneeJilin University

InventorsChuanhai Chen, Zhifeng Liu, Jingyan Guo, Shang Chen, Tongtong Jin, Baobao Qi, Zhaojun Yang, Junqi Long, Zhijie Li, Chunlei Hua, Liang Zhang, Haoming Yan

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Abstract

An unloading device and an unloading method for a gantry-type machining center beam guide rail is disclosed, which is used to be installed on a sliding plate assembly, comprising a first booster mechanism and a second booster mechanism. When a worm rotates and drives a worm gear to rotate, an axial displacement can be generated by the worm gear along a worm gear shaft to push the retaining sleeve assembly, and an unloading force generated acts on a first mounting bracket. An unloading bolt of the second booster mechanism is connected with a press plate through threads, the unloading bolt is rotated to generate an axial displacement, and a second sliding block is pressed tightly against an unloading guide rail vertical surface by a second mounting bracket to generate an unloading force.

Claims10

Dependent claims

An unloading device for a gantry-type machining center beam guide rail, which is used to be installed on a sliding plate assembly (1), wherein the sliding plate assembly (1) is slidably connected with a beam guide rail (2) of a gantry-type machining center, and the beam guide rail (2) has an upper guide rail surface (21), lower guide rail surfaces (22), an unloading guide rail horizontal surface (23), an unloading guide rail vertical surface (24) and pretightening guide rail surfaces (25);

the unloading device comprises:
a first booster mechanism (3), wherein the first booster mechanism (3) comprises a worm (31), a worm gear gland (32), a worm gear shaft (33), a worm gear (34), a retaining sleeve assembly (35), a first mounting bracket (36) and a first sliding block (37), the worm (31) is horizontally and rotationally connected with the sliding plate assembly (1), the worm gear gland (32) is fixed on the sliding plate assembly (1), a screw hole is formed in the worm gear gland (32), the top end of the worm gear shaft (33) is connected in the screw hole through threads, the worm gear (34) is fixed on the worm gear shaft (33) and is engaged with helical teeth of the worm, a shaft hole is formed in the first mounting bracket (36), the bottom end of the worm gear shaft (33) is slidably connected in the shaft hole, the retaining sleeve assembly (35) is sheathed on the edge of the bottom end of the worm gear shaft (33), the bottom end of the retaining sleeve assembly (35) is butted with the first mounting bracket (36), the first sliding block (37) is installed on the bottom end of the first mounting bracket (36), and the bottom end of the first sliding block (37) is slidably connected with the unloading guide rail horizontal surface (23);
a second booster mechanism (4), wherein the second booster mechanism (4) comprises an unloading bolt (41), a second mounting bracket (42) and a second sliding block (43), an unloading press plate (10) is fixed on one side of the sliding plate assembly (1), the unloading bolt (41) is horizontally connected with the unloading press plate (10) through threads, a through hole is formed in the second mounting bracket (42), a shaft lever (5) is coaxially fixed on one end of the unloading bolt (41), the shaft lever (5) is rotationally connected in the through hole, one end of the unloading bolt (41) is butted with the second mounting bracket (42), the second sliding block (43) is fixedly connected with one side of the second mounting bracket (42) away from the unloading bolt (41), and the second sliding block (43) is slidably connected with the unloading guide rail vertical surface (24).

An unloading method for a gantry-type machining center beam guide rail, comprising the following steps:

step 1:
dividing the guide rail surfaces on the beam guide rail (2) into the upper guide rail surface (21), the lower guide rail surfaces (22), the unloading guide rail horizontal surface (23), the unloading guide rail vertical surface (24) and the pretightening guide rail surfaces (25) according to the actual engineering, wherein a guide rail surface which bears a load only playing a pretightening role and has no resistance to an overturning trend of the sliding plate assembly is regarded as a pretightening guide rail surface, and the upper guide rail surface (21), the lower guide rail surfaces (22), the unloading guide rail horizontal surface (23) and the unloading guide rail vertical surface (24) are regarded as main load-bearing guide rail surfaces, and establishing a stress balance equation for each main load-bearing guide rail surface;
∑
F
X
=
0
∑
F
Y
=
0
∑
M
=
0
(1)
step 2:
introducing a rotation angle α formed by the overturning effect of the sliding plate assembly (1), an included angle β between a connecting line from a rotation center to a corresponding unloading application point of the unloading guide rail vertical surface (24) and the horizontal direction, a vertical deformation δ of a plastic laminated surface, and coordinates of the rotation center, and obtaining deformation compatibility equations based on a stressed area S of each main load-bearing guide rail surface;
δ
=
cos
β
α
l
(2)
F
=
cos
β
α
l
k
S
(3)
assuming that the distance between the rotation center and the application point of a resultant force F on each main load-bearing guide rail surface is l, and the stiffness of a contact surface is k;
step 3:
taking the horizontal and vertical coordinates of the application point of the resultant force on each guide rail surface as boundaries to divide the surface into a plurality of rectangular regions, overturning the sliding plate assembly (1) in a direction opposite to the position of the beam, judging the increasing and decreasing trend of the pressure of each guide rail surface compared with that when the sliding plate assembly (1) is not overturned, analyzing the pressure variation trend of each guide rail surface when the rotation center is located in each rectangular region, selecting each rectangular region with the variation trend conforming to the actual situation as a possible distribution region of the rotation center, establishing a geometric equation for each possible distribution region, and establishing a mathematical model based on the deformation compatibility equations and the balance equations.
∑
F
X
=
0
∑
F
Y
=
0
∑
M
=
0
sin
β
1
⋅
l
1
+
λ
1
⋅
sin
β
2
⋅
l
2
=
a
1
cos
β
1
⋅
l
1
+
ψ
1
⋅
cos
β
2
⋅
l
2
=
b
1
⋮
sin
β
n
−
3
⋅
l
n
−
3
+
λ
n
−
2
⋅
sin
β
n
−
2
⋅
l
n
−
2
=
a
n
−
3
cos
β
n
−
3
⋅
l
n
−
3
+
ψ
n
−
2
⋅
cos
β
n
−
2
⋅
l
n
−
2
=
b
n
−
3
(4)
.

152 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/346,876Filed 5 Jul 2023
Priority: CN 202210792404.35 Jul 2022
Published: 2 Nov 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B23Q 1/012
Frames, beds, pillars or like members; Arrangement of ways: portals
B23Q 41/08
Combinations or associations of metal-working machines not directed to a particular result according to classes B21, B23, or B24: features…
B23Q 11/0014
Arrangements compensating weight or flexion on parts of the machine: using static reinforcing elements, e.g. pre-stressed ties
B23Q 2210/00
Machine tools incorporating a specific component