CN219962903U - Lifting device capable of automatically moving scanning bed longitudinally - Google Patents

Abstract

The utility model discloses a lifting device capable of automatically moving a scanning bed along a longitudinal direction. The lifting device comprises a bottom plate, a shearing fork group, a long rack, a double-layer gear and a lathe bed rack. According to the utility model, when the first height interval is lifted, the lathe bed can move longitudinally at the same time; when the second height section is lifted, the lathe bed is stationary along the longitudinal direction; when the second height section descends, the lathe bed is stationary along the longitudinal direction; when the first height section descends, the bed moves in the longitudinal direction in the opposite direction. The utility model can automatically generate longitudinal displacement when the scanning bed is vertically lifted by the gear rack transmission, so as to enlarge the overhaul space of the scanning bed and shorten the suspension length of the bed board.

Description

Lifting device capable of automatically moving scanning bed longitudinally

Technical Field

The utility model relates to a lifting device capable of automatically moving a scanning bed along a longitudinal direction, and belongs to the technical field of medical appliances.

Background

The scanning bed used in the static CT system needs to realize lifting movement in the vertical direction (namely Y direction) and horizontal movement in the longitudinal direction (namely Z direction). The lifting device of the scissor fork structure can realize the lifting function of the scanning bed, but the lifting device of the structure is relatively close to the scanning frame, has a narrow space and is inconvenient to maintain. If the maintenance space is increased, the bed frame is designed to be far away from the scanning frame, and the bed frame needs to be designed to be longer, so that the distance that the bed board extends out of the scanning bed is longer. Because the suspending distance of the bed board is long, the rigidity is reduced, and the deformation of the light plane is too large, so that the quality of the scanning image of the static CT system can be seriously affected.

In the chinese patent application No. 201910756104.8, a vertical lift scanning bed is disclosed that can increase the scanning range and maintenance space. According to the technical scheme, the lifting and longitudinal movement of the scanning bed are driven through the spring device and the bottom driving device. Compared with the existing CT scanning bed, the vertical lifting scanning bed can vertically lift in a scanning area, so that a patient can be conveniently positioned, and outside the scanning area, the bed frame automatically moves backwards when the patient falls down, so that the maintenance space is increased, and interference is avoided.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide the lifting device capable of automatically moving the scanning bed along the longitudinal direction, so that the scanning bed can automatically generate longitudinal displacement while vertically lifting through the transmission of the gear rack.

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

a lifting device capable of automatically moving a scanning bed along a longitudinal direction comprises a bottom plate, a first scissor group, a second scissor group, a long rack, a double-layer gear and a lathe bed rack,

the first shearing fork group and the second shearing fork group are connected to the bottom plate along the vertical direction;

the first shearing fork group and the second shearing fork group are hinged from the middle part and are of an X-shaped structure;

the top end of the first shearing fork group is connected with the long toothed bar, and the long toothed bar is longitudinally arranged and extends towards the top end of the second shearing fork group;

the double-layer gear comprises an upper layer gear and a lower layer gear, and the upper layer gear and the lower layer gear are arranged in layers along the vertical direction and are mutually fixed and can rotate around the gear shaft together;

the diameter of the upper layer gear is smaller than that of the lower layer gear, and the transmission ratio is determined according to design requirements;

the double-layer gear is arranged at the top end of the second scissor fork group, and the gear shaft is arranged along the vertical direction;

the lathe bed rack is fixed on the inner side of the lathe bed and is longitudinally arranged, and the position of the lathe bed rack is close to the double-layer gear;

the long rack is meshed with the upper layer gear, and the lathe bed rack is meshed with the lower layer gear.

Wherein preferably, the lifting device further comprises a bed slider;

the top end of the first shear fork group is connected with the lathe bed sliding block, and the lathe bed sliding block can rotate around the top end of the first shear fork group; wherein one or a plurality of the lathe bed sliding blocks are fixed with the long racks which are not movable and/or rotatable.

Wherein preferably, the lifting device further comprises a limiting clamp;

the top end of the second shear fork group is connected with the lathe bed sliding block, and the lathe bed sliding block can rotate around the top end of the second shear fork group; wherein, one or a plurality of the lathe bed sliders are provided with the double-layer gear and/or the limiting clamp;

the gear axis of the double-layer gear is arranged along the vertical direction.

Wherein, preferably, the lifting device also comprises a lathe bed guide rail and a lathe bed limiting block,

the lathe bed guide rail is fixed on the inner side of the lathe bed and is longitudinally arranged;

the lathe bed guide rail is embedded into the lathe bed sliding block, and the lathe bed sliding block can slide back and forth along the lathe bed guide rail;

the lathe bed limiting blocks are fixed on the inner side of the lathe bed and are positioned at two ends of the lathe bed guide rail.

Wherein preferably, the lifting device further comprises a lathe bed limiting groove; the lathe bed limiting groove is fixed on the inner side of the lathe bed and can be mutually fixedly connected with the limiting clamp, so that the lathe bed sliding block connected with the limiting clamp is fixed with the lathe bed.

Wherein preferably, the lifting device further comprises a bearing seat and a bottom plate sliding block;

the bearing seat is connected with the lower end of the first shearing fork group and can rotate around the lower end of the first shearing fork group;

the bottom plate sliding block is connected with the lower end of the second shearing fork group and can rotate around the lower end of the second shearing fork group.

Wherein preferably, the lifting device further comprises a bottom plate guide rail;

the bottom plate sliding block is arranged on the bottom plate guide rail and can slide back and forth along the bottom plate guide rail.

Wherein, preferably, the bearing seats are symmetrically fixed at one end of the bottom plate, and the axes are arranged along the horizontal direction;

the bottom plate guide rail is symmetrically fixed at the other end of the bottom plate and is longitudinally arranged.

Wherein preferably, the lifting device further comprises a lifting mechanism;

the lifting mechanism is connected between the lower arm of the first scissor group and the upper arm of the second scissor group, and can change the included angle between the lower arm of the first scissor group and the upper arm of the second scissor group so as to raise or lower the lathe bed.

Compared with the prior art, the lifting device capable of automatically moving the scanning bed along the longitudinal direction can realize that the bed body moves along the longitudinal direction at the same time when lifting in a first height interval; when the second height section is lifted, the lathe bed is stationary along the longitudinal direction; when the second height section descends, the lathe bed is stationary along the longitudinal direction; when the first height section descends, the bed moves in the longitudinal direction in the opposite direction. When the scanning bed rises, the bed board extending into the scanning hole can be shortened. When the scanning bed descends, the maintenance space is larger.

Drawings

FIG. 1 is a schematic diagram of a lifting device capable of automatically moving a scanning bed in a longitudinal direction according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the lifting frame in FIG. 1;

FIG. 3 is a schematic view of the bed attachment of FIG. 1;

FIG. 4 is a schematic diagram of the double-layer gear, the long rack and the machine tool rack in FIG. 1;

FIG. 5 is a schematic view showing a positional relationship between a double-layer gear, a long rack and a lathe bed rack along the Z direction in FIG. 4;

FIG. 6 is a schematic view of the double-layer gear, the long rack and the machine tool rack in the Z direction in FIG. 4;

fig. 7 is a schematic diagram of a displacement relationship between a vertical direction and a longitudinal direction of the lifting device provided by the utility model.

Detailed Description

The technical contents of the present utility model will be described in detail with reference to the accompanying drawings and specific examples.

As shown in fig. 1 to 3, the lifting device capable of automatically moving the scanning bed in the longitudinal direction according to the embodiment of the present utility model includes a lifting frame 100, a lifting mechanism 400 and a bed accessory 200 for lifting and longitudinally moving the scanning bed 300. The lifting frame 100 comprises a bottom plate 1, a bearing seat 2, a first scissor group 3, a second scissor group 4, a bottom plate guide rail 5, a bottom plate sliding block 6, a lathe bed sliding block 7, a limiting clamp 13, a long rack 14, a double-layer gear 15 and a hinged bearing 16. The lifting mechanism 400 is connected to the lifting frame 100, and has various driving modes, and the embodiment takes screw driving as an example, and comprises a screw fixing seat 8, a motor 9, a transmission part 10, a lifting screw 11 and a screw lifting seat 12. The bed accessory 200 is fixed on the bed 300, and the bed accessory 200 comprises a bed rack 21, a bed guide rail 22, a bed limit groove 23 and a bed limit block 24.

The bottom plate 1 is a rectangular metal plate, and is longitudinally arranged in the length direction. One end of the bottom plate 1 is symmetrically fixed with two bearing seats 2 relative to the longitudinal direction, and the rotation axis of the bearing is arranged along the horizontal direction. The other end of the bottom plate 1 is symmetrically provided with two bottom plate guide rails 5 relative to the longitudinal direction, and the length direction of the bottom plate guide rails 5 is arranged along the longitudinal direction.

The bottom plate slide block 6 is arranged on the bottom plate guide rail 5, and the bottom plate guide rail 5 is arranged under the bottom plate guide rail 5. The floor slider 6 is reciprocally slidable in the longitudinal direction on the floor rail 5.

The fork sets comprise a first fork set 3 and a second fork set 4. The first scissor set 3 is formed by symmetrically welding two first scissor set scissor plates 31. The first fork group fork plate 31 is a long irregular polygon. The two first fork plates 31 are arranged face to face with a support beam welded therebetween.

The second scissors group 4 has the same structure as the first scissors group 3, and is formed by welding two second scissors group scissors plates 41.

It should be noted that, in this embodiment, only the case where the first fork group 3 and the second fork group 4 are formed by connecting (e.g. welding) two fork plates is shown, but the number of the fork plates of each fork group may be one or more.

The first scissors group 3 and the second scissors group 4 are mutually hinged from the middle part and are in an X-shaped structure. After the shearing fork group is hinged, the shearing fork plates of the shearing fork group are parallel to each other, and a hinged bearing 16 is arranged at the hinged position. The first and second sets of scissors 3, 4 are rotatable about the hinge bearing 16, changing the angle between the sets of scissors.

The lower end of the first shearing fork group 3 is connected with the bearing seat 2 and can rotate around the bearing seat 2. The lower end of the second shearing fork group 4 is connected with the bottom plate sliding block 6 and can rotate around the bottom plate sliding block 6. The scissors group is vertically arranged, the part of the scissors plate lower than the hinge bearing 16 is a lower arm, and the part of the scissors plate higher than the hinge bearing 16 is an upper arm.

The lower arms of the first scissors group 3 are connected with a screw rod fixing seat 8 and can rotate mutually. The top end of the upper arm of the shearing fork plate of the first shearing fork group 3 is connected with a lathe bed slide block 7, and the upper arm are rotatable with each other. One or a plurality of the machine body sliding blocks 7 are fixedly provided with long racks 14, the installation direction is arranged along the longitudinal direction, and the long racks extend towards the top end direction of the upper arm of the shearing fork plate of the second shearing fork group 4. The long rack 14 is not movable and/or rotatable relative to the bed slide 7 of its mounting base. The long rack 14 includes a toothed portion and a toothless portion. Wherein the toothed portion is arranged near one end of the second scissor set 4, and the length of the toothed portion is determined according to design requirements.

The upper arms of the shearing fork plates of the second shearing fork group 4 are connected with a screw rod lifting seat 12 and can rotate mutually. The top end of the upper arm of the shearing fork plate of the second shearing fork group 4 is connected with a lathe bed slide block 7, and the upper arm are rotatable with each other. One or a plurality of the machine body sliders 7 are fixedly provided with a limiting clamp 13 and a double-layer gear 15.

The mounting shaft of the double-layer gear 15 is arranged in the vertical direction. The double-layer gear 15 includes two concentric gears (an upper gear 151 and a lower gear 152) having different diameters, which are layered in the vertical direction and fixed to each other so as to be rotatable together about a gear shaft. The diameter of the upper gear 151 is smaller than the diameter of the lower gear 152. The displacement of the long rack 14 in the vertical direction near to the end of the double-layer gear 15 may be limited by a step structure formed by the diameter difference between the upper-layer gear 151 and the lower-layer gear 152, or may be limited by a structure such as a chute, a sliding pin, etc. on the machine body 300 or the second scissor set 4. The transmission ratio of the two gears of the double-layer gear 15 is determined according to design requirements, and in this embodiment, the transmission ratio is taken as a as an example.

A motor 9, a transmission part 10 and a lifting screw 11 are sequentially fixed on the screw rod fixing seat 8. The other end of the lifting screw rod 11 penetrates into the screw rod lifting seat 12. The motor 9 drives the lifting screw rod 11 to rotate forwards/reversely through the transmission part 10, so that the relative position of the screw rod fixing seat 8 and the screw rod lifting seat 12 can be changed.

The lathe bed rack 21 is fixed inside the lathe bed 300, and the length direction is along vertical arrangement, and the mounted position is close to the one end that has double-deck gear 15, matches with the mounted position of the lower floor's gear 151 of double-deck gear 15. The mounting surface of the bed rack 21 is attached to the inner wall plate of the bed 300, and the tooth surface of the rack faces the double-layer gear 15. The length of the lathe bed rack 21 is determined according to the design requirement. The width dimension of the lathe bed rack 21 is matched with the thickness of the lower layer gear of the double-layer gear 15.

The bed guide 22 is fixed to both sides of the inner side of the bed 300, and is longitudinally arranged in the longitudinal direction. The mounting surface of the bed rail 22 is bonded to the inner wall plate of the bed 300.

The bed guide rail 22 and the bed rack 21 are both installed inside the bed 300 and parallel to each other. In the vertical direction, the bed guide rail 22 is on the upper part, the bed rack 21 is on the lower part, and a space is reserved in the middle for the long rack 14 to penetrate. Because of the different installation planes of the inner side of the lathe bed 300 in a stepped manner, the long rack 14 is meshed with the upper layer gear 151, and the lathe bed rack 21 is meshed with the lower layer gear 152, so that interference is avoided.

The bed limiting grooves 23 are fixed on an inner side wall plate of the bed 300 in the vertical direction, and a plurality of the bed limiting grooves 23 are arranged at intervals in the longitudinal direction and have the same height in the vertical direction. The position of the lathe bed limit groove 23 corresponds to the installation position of the limit clamp 13. The number and the arrangement pitch of the bed limiting grooves 23 are determined according to design requirements, and in this embodiment, the arrangement number two and the arrangement pitch L1 are taken as examples.

The bed limiting block 24 is fixed on the bed 300, and the installation position can be at two ends, two sides or one side of the bed guide rail 22, or can be replaced by a supporting beam of the bed 300. In the present embodiment, the bed stopper 24 is mounted at two ends of the bed rail 22.

After the bed 300 and the lifting frame 100 are assembled, each bed guide rail 22 is embedded into the corresponding two bed sliders 7 and can slide relative to each other. The limiting clamp 13 and the lathe bed limiting groove 23 can be mutually fixed.

After the bed 300 and the lifting frame 100 are assembled, the long racks 14, the bed guide rail 22 and the bed rack 21 are mutually parallel, and are arranged along the vertical direction, and the bed guide rail 22, the long racks 14 and the bed rack 21 are sequentially arranged from top to bottom.

As shown in fig. 4, the long rack 14 is supported by different mounting planes inside the bed 300, and is engaged with the upper gear 151 of the double-layer gear 15, and the bed rack 21 is engaged with the lower gear 152 of the double-layer gear 15.

As shown in fig. 5, one positional relationship between the double-layer gear 15 and the long rack 14 and the bed rack 21 is: (1) no gap exists between the upper gear 151 and the lower gear 152; (2) the width of the long rack 14 is equal to the thickness of the upper layer gear 151; (3) the long rack 14 is flush with the upper gear 151 in the vertical direction; (4) the width of the lathe bed rack 21 is equal to the thickness of the lower layer gear 152; (5) the bed rack 21 is vertically flush with the lower gear 152.

As shown in fig. 6, the further positional relationship between the double-layer gear 15 and the long rack 14 and the bed rack 21 is: (1) the upper gear 151 and the lower gear 152 are spaced apart from each other, but are still fixed to each other and coaxially rotated; (2) the width of the long rack 14 is smaller than the thickness of the upper layer gear 151; (3) the long rack 14 is not flush with the upper gear 151 in the vertical direction; (4) the width of the lathe bed rack 21 is equal to the thickness of the lower layer gear 152; (5) the bed rack 21 is not flush with the lower gear 152 in the vertical direction.

It should be noted that, in the present embodiment, only two positional relationships, as shown in fig. 5 and 6, of the double-layer gear 15, the long rack 14, and the bed rack 21 are shown, and other positional relationships not shown may be combined, which are all within the scope of the present utility model.

In one embodiment of the utility model, as shown in fig. 7, the base plate 1 is fixed to the ground. When the bed 300 is at the lowest position, the vertical height of the bed 300 from the floor 1 is H1. At this time, the bed stopper 24 keeps the bed slider 7 from being separated from the bed guide rail 22. The two shearing fork groups are mutually hinged to be X-shaped, the bottom end of the first shearing fork group 3 is connected with the bearing seat 2, and the position of the first shearing fork group relative to the bottom plate 1 is fixed. The bottom end of the second scissor set 4 is longitudinally slidable on the floor rail 5, but the vertical height is not changeable. The top end of the first scissor set 3 is longitudinally slidable on the bed rail 22 and can change the vertical height and longitudinal position. The top end of the second scissor set 4 can slide on the bed guide 22 along the longitudinal direction, the height of the vertical direction can be changed, and the longitudinal position cannot be changed.

The motor 9 rotates, drives the lifting screw rod 11 to rotate through the transmission of the transmission component 10 so as to push the screw rod lifting seat 12 to move, so that the included angle between the first shearing fork group 3 and the second shearing fork group 4 is adjusted, and lifting movement is realized.

Along with lifting of the lifting device, the included angle between the lower arm of the fork plate of the first fork group 3 and the upper arm of the fork plate of the second fork group 4 is gradually increased, and the distance between the top ends of the upper arms of the two fork groups is gradually reduced because the two fork groups are mutually hinged to be in an X shape. Since the long rack 14 is connected to the bed slider 7 at the top end of the first scissor set 3 only and is parallel to the bed rail 22, the long rack 14 is pushed to move longitudinally. The long rack 14 is displaced from the top end of the second scissor set 4. And because the double-layer gear 15 is vertically arranged on the bed slide block 7 at the top end of the second scissor group 4, the long rack 14 and the double-layer gear 15 are displaced. Through the meshing relationship of the gear and the rack, the long rack 14 drives the upper layer gear 151 of the double-layer gear 15 to rotate around the mounting shaft, and the lower layer gear 152 of the rotating double-layer gear 15 drives the lathe bed rack 21 and the lathe bed 300 to longitudinally displace.

When the limit clamp 13 moves from the bed limit groove 23 near one end of the bed 300 to the bed limit groove 23 far from one end of the bed 300 with respect to the bed 300, the movement distance of the bed rack 21 in the longitudinal direction with respect to the base plate 1 is L3, and the movement distance of the second scissor set 4 on the base plate guide rail 5 is L2. Where l2=l1, l3=a·l2, a is a gear ratio example of the double-layer gear 15. At this time, the bed 300 is lifted to a vertical height H2 by the lifting device, and is displaced by H2-H1. Thus, with the long rack 14, the bed rack 21, and the double-layer gear 15, the bed 300 is vertically lifted while being moved in the longitudinal direction. Furthermore, based on the transmission ratio of the double-layer gear 15, the travel of the bed can be made larger than the moving distance of the lower end of the scissor group.

When the lathe bed 300 is lifted to the vertical height H2, the limiting clamp 13 is fixedly connected with the lathe bed limiting groove 23, so that the top end of the second scissor set 4 is fixedly connected with the lathe bed 300. The long rack 14 and the lathe bed rack 21 are disengaged from the double-layer gear 15 according to the design size, and the lathe bed 300 loses power of longitudinal movement.

Because the lower end of the first scissor group 3 is connected with the bearing seat 2, the top ends of the lathe bed 300 and the second scissor group 4 are connected with the lathe bed limiting groove 23 through the limiting clamp 13, and the relative positions are static, the lifting device continues to lift, the lathe bed 300 does not move along the longitudinal direction any more, and only continues to lift along the vertical direction. The lifting device can lift the bed 300 to a height H3 at the highest.

When the lifting device descends, the motion relation of the whole device is opposite to that of the lifting device.

In summary, according to the lifting device capable of automatically moving the scanning bed in the longitudinal direction provided by the utility model, the bed 300 simultaneously moves in the longitudinal direction during lifting in the first height section (H1-H2) through the devices such as the hinged support, the lifting mechanism, the longitudinal rack and the gear; when the second height section (H2-H3) is lifted, the lathe bed 300 is stationary along the longitudinal direction; when the second height section (H3-H2) descends, the bed 300 is stationary in the longitudinal direction; when the first height section (H2-H1) descends, the bed 300 moves in the opposite direction of the longitudinal direction. The lifting device is driven by the gear and the rack, so that the scanning bed can automatically generate longitudinal displacement when being lifted vertically, the overhaul space of the scanning bed is enlarged, and the suspension length of the bed board is shortened. In addition, the lifting device drives the longitudinal movement of the lathe bed by using a gear and rack structure, and the power source is the driving power for lifting/lowering the lifting frame, so that no additional power source is required.

It should be noted that the above embodiments are only examples, and the technical solutions of the embodiments may be combined, which are all within the protection scope of the present utility model.

In addition, the positional or positional relationship indicated by the terms "thickness", "depth", "upper", "lower", "horizontal", etc. are based on the positional or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The lifting device capable of automatically moving the scanning bed along the longitudinal direction provided by the utility model is described in detail above. Any obvious modifications to the present utility model, without departing from the spirit thereof, would constitute an infringement of the patent rights of the utility model and would take on corresponding legal liabilities.

Claims (9)

1. A lifting device capable of automatically moving a scanning bed along a longitudinal direction is characterized by comprising a bottom plate (1), a first scissor group (3), a second scissor group (4), a long rack (14), a double-layer gear (15) and a lathe bed rack (21),

the first shearing fork group (3) and the second shearing fork group (4) are connected to the bottom plate (1) along the vertical direction;

the first shearing fork group (3) and the second shearing fork group (4) are hinged from the middle part and are of an X-shaped structure;

the top end of the first shearing fork group (3) is connected with the long toothed bar (14), and the long toothed bar (14) is longitudinally arranged and extends towards the top end of the second shearing fork group (4);

the double-layer gear (15) comprises an upper layer gear (151) and a lower layer gear (152), and the upper layer gear and the lower layer gear are arranged in layers along the vertical direction and are mutually fixed and can rotate around a gear shaft together;

the diameter of the upper gear (151) is smaller than that of the lower gear (152), and the transmission ratio is determined according to the design requirement;

the double-layer gear (15) is arranged at the top end of the second scissor fork group (4), and the gear shaft is arranged along the vertical direction;

the lathe bed rack (21) is fixed on the inner side of the lathe bed (300) and is longitudinally arranged, and the position of the lathe bed rack is close to the double-layer gear (15);

the long racks (14) are meshed with the upper layer gear (151), and the lathe bed racks (21) are meshed with the lower layer gear (152).

2. Lifting device capable of automatically moving a scanning bed in a longitudinal direction according to claim 1, characterized by further comprising a bed slide (7);

the top end of the first scissor group (3) is connected with the lathe bed sliding block (7), and the lathe bed sliding block (7) can rotate around the top end of the first scissor group (3); wherein one or a plurality of the machine tool body sliders (7) are fixed with the long racks (14) which are not movable and/or rotatable with each other.

3. Lifting device capable of automatically moving a scanning bed in a longitudinal direction according to claim 2, characterized by further comprising a limit clamp (13);

the top end of the second scissor group (4) is connected with the lathe bed sliding block (7), and the lathe bed sliding block (7) can rotate around the top end of the second scissor group (4); wherein, one or a plurality of the lathe bed sliding blocks (7) are provided with the double-layer gear (15) and/or the limiting clamp (13);

the gear axis of the double-layer gear (15) is arranged along the vertical direction.

4. A lifting device capable of automatically moving a scanning bed in a longitudinal direction according to claim 3, further comprising a bed guide (22) and a bed stopper (24),

the bed guide rail (22) is fixed on the inner side of the bed (300) and is longitudinally arranged;

the lathe bed guide rail (22) is embedded into the lathe bed sliding block (7), and the lathe bed sliding block (7) can slide back and forth along the lathe bed guide rail (22);

the bed limiting blocks (24) are fixed on the inner side of the bed (300) and are positioned at two ends of the bed guide rail (22).

5. The lifting device capable of automatically moving the scanning bed in the longitudinal direction according to claim 4, further comprising a bed limiting groove (23),

the lathe bed limiting groove (23) is fixed on the inner side of the lathe bed (300) and can be mutually fixedly connected with the limiting clamp (13), so that the lathe bed sliding block (7) connected with the limiting clamp (13) is fixed with the lathe bed (300).

6. The lifting device capable of automatically moving the scanning bed along the longitudinal direction according to claim 5, further comprising a bearing seat (2) and a bottom plate sliding block (6),

the bearing seat (2) is connected with the lower end of the first scissor group (3) and can rotate around the lower end of the first scissor group (3);

the bottom plate sliding block (6) is connected with the lower end of the second shearing fork group (4) and can rotate around the lower end of the second shearing fork group (4).

7. Lifting device capable of automatically moving a scanning bed in a longitudinal direction according to claim 6, characterized by further comprising a floor rail (5);

the bottom plate sliding block (6) is arranged on the bottom plate guide rail (5) and can slide back and forth along the bottom plate guide rail (5).

8. The elevating device capable of automatically moving the scanning bed in the longitudinal direction according to claim 7, wherein:

the bearing seats (2) are symmetrically fixed at one end of the bottom plate (1), and the axes are arranged along the horizontal direction;

the bottom plate guide rail (5) is symmetrically fixed at the other end of the bottom plate (1) and is longitudinally arranged.

9. The lifting device capable of automatically moving the scanning bed in the longitudinal direction according to claim 8, further comprising a lifting mechanism (400),

the lifting mechanism (400) is connected between the lower arm of the first scissor group (3) and the upper arm of the second scissor group (4), and the included angle between the lower arm of the first scissor group (3) and the upper arm of the second scissor group (4) can be changed so as to raise or lower the lathe bed (300).