A multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component

Abstract

The present invention relates to the technical field of display of a three-dimensional visualization platform, and specifically to a display angle adjustment component of a multi-dimensional dynamic three-dimensional visualization platform. Limiting balls located in an inner cavity of a limiting frame are arranged at both end portions of an elastic band. The outer diameter of the limiting ball is greater than the inner diameter of a ball groove. The thickness of a through port on the ball groove is equal to the thickness of the elastic band. The limiting ball is pressed into the ball groove. The beneficial effect is as follows: by designing an existing curtain to have a sleeve ring, one end of the curtain is fixed by the sleeve ring. During the rotation adjustment process, the other end of the curtain is pulled, and the elastic band is used to adapt to the extension or deformation caused by the pulling. The cooperation of the limiting frame and the limiting ball is used to limit the extension length, thereby adapting to different rotation angles of the curtain. The rotatable display component is cooperated to achieve mutual angle cooperation, so that the three-dimensional model is accurately and clearly projected on the curtain.

Description

Technical Field

[0001] The invention relates to the technical field of display of a three-dimensional visualization platform, and in particular to a display angle adjustment component of a multi-dimensional dynamic three-dimensional visualization platform. Background Art

[0002] With the advancement of three-dimensional technology, in the prior art, when conducting industrial or architectural design, a three-dimensional model is usually first established in a computer, and then the established model is displayed using a camera, a display screen and other devices, so as to facilitate intuitive display.

[0003] Existing display methods mostly use display screens, but the display screens are large in size and occupy a large area. The size of the equipment causes a waste of the display environment. At the same time, it is difficult to move and transport, and it is not easy to adjust the angle, and the cost is high. Therefore, common exhibition venues mostly use curtains instead of existing display screens, and use cameras to project multi-dimensional dynamic three-dimensional models on the curtains for display, which reduces costs, is easy to store, and reduces the floor space. Existing patent: CN201821531934.8 A novel external projection three-dimensional visual display device includes a bottom plate, a projection screen is provided on the top of the bottom plate, a rotating shaft is rotatably installed on the top of the bottom plate, a support frame is fixedly connected to the top of the rotating shaft, a cross plate is fixedly connected to the top of the support frame, a push rod motor is provided on the support frame, the top of the cross plate is hinged with two symmetrically arranged adjusting rods, the output shaft of the push rod motor is fixedly connected with a cross bar, the cross bar is located above the cross plate, and the top of the cross bar is hinged with two symmetrically arranged linkage rods, one end of the adjusting rod is hinged with a fixed block, a horizontally arranged pin is rotatably installed on the fixed block, and one end of the pin is fixedly connected with a clamping plate.

[0004] However, the screen projection method still cannot solve the problem of structural angle adjustment, especially the coordination of the screen angle and the camera angle. During the rotation and adjustment of the screen, the screen will be stretched, thereby increasing the gap on the screen, causing the projected model to be distorted and the display effect to be poor. Summary of the invention

[0005] The object of the present invention is to provide a multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component includes an adjustment component, the adjustment component includes a storage rack and a circular rail, the storage rack is provided with a motor-driven storage roller, the storage roller is rotatably wound with a display platform, the circular rail is provided with a rotatable and adjustable display component, the display component includes a rotating block and a camera, the camera is facing the display platform,

[0008] The display platform includes a display curtain, an elastic band, a ring and a limiting ball. The ring is fixedly sleeved on the storage roller, and the outer wall of the ring is connected with the elastic band. The other end of the elastic band is connected to the display curtain, and the other end of the display curtain is connected to the moving component. Both ends of the storage frame are provided with limiting frames, and the limiting frame is penetrated by a ball groove. The elastic band slides and extends along the ball groove, and limiting balls located in the inner cavity of the limiting frame are provided at both side ends of the elastic band. The outer diameter of the limiting ball is greater than the inner diameter of the ball groove. The thickness of the through port on the ball groove is equal to the thickness of the elastic band, and the limiting ball is pressed into the ball groove.

[0009] Preferably, the storage rack is provided with an inner shaft driven by a motor, the storage roller is fixedly sleeved on the inner shaft, a pressing groove is provided on the outer wall of the storage roller, a pressing rod is inserted in the pressing groove to press the ring onto the inner wall of the pressing groove, the end of the pressing rod is fixedly sleeved on the inner shaft, and the outer diameter of the pressing rod is smaller than the inner diameter of the pressing groove.

[0010] Preferably, the display assembly is rotatably mounted on a rotating frame, an extension arm is provided on the outer wall of the rotating frame, the upper end of the circular rail is fixedly mounted on the top beam through a connecting rod, a rotating groove is provided on the circular rail, the extension arm is rotatably mounted on the rotating groove, a connecting block is provided at the lower end of the circular rail, and the storage rack is mounted on the connecting block.

[0011] Preferably, a ground rail is provided at the lower end of the connecting block, a moving component is installed on the ground rail for transverse sliding, the moving component includes a moving frame, a roller is provided at the lower end of the moving frame, the roller is located in the ground rail, a lifting rod is provided at the upper end of the moving frame, a connecting roller is provided at the upper end of the lifting rod, and the connecting roller is fixedly connected to one end of the display curtain.

[0012] Preferably, an inner frame is provided on the inner side of the rotating frame, the inner frame is driven by a rotating motor, and the upper end of the rotating motor is fixed on the top beam, the display assembly is installed on the rotating frame, the rotating block is rotatably installed on the inner side of the rotating frame, and the rotating block is provided with driven teeth, the inner side of the rotating frame is provided with linkage teeth meshing with the driven teeth, and the rotating frame is provided with a driving device for driving the linkage teeth to rotate.

[0013] Preferably, the driving device includes a tooth plate, one side of the tooth plate is vertically slidably inserted in a side groove extending vertically on the inner side of the rotating frame, the other side of the tooth plate is provided with a rack meshing with the linkage teeth, the lower end of the rotating frame is provided with a side frame, the lower end of the tooth plate is slidably inserted in the side frame, and the lower end of the tooth plate is provided with a bottom block, and the lower end of the side frame is provided with a screw rod threadedly installed, the upper end of the screw rod is connected to the bottom block, and the lower end of the screw rod is driven by a driving member.

[0014] Preferably, a second spring is sleeved on the screw rod, the upper end of the second spring abuts against the bottom block, and the lower end of the second spring abuts against the inner wall of the side frame.

[0015] Preferably, a positioning rotating block is provided on the front and rear side walls of the rotating block, a semicircular positioning arc groove is provided on the rotating frame, the positioning rotating block is slidably installed in the positioning arc groove, a storage arc plate coaxially distributed with the driven tooth is provided on the rotating frame, and the end of the camera can be rotated to the inner side of the lower end of the storage arc plate.

[0016] Preferably, a crossbeam is vertically arranged at the upper end of the rotating frame, and a pull rope passing through the storage arc plate and the crossbeam is arranged on the rotating block, and the end of the pull rope extends to the upper end of the crossbeam and is fixedly connected to the lifting frame.

[0017] Preferably, a first spring is provided at the lower end of the lifting frame, the first spring is pressed between the cross beam and the lifting frame, and positioning rods sliding through the cross beam are provided on both sides of the lifting frame.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention designs the existing curtain to have a ring, and uses the ring to fix one end of the curtain. During the rotation and adjustment process, the other end of the curtain is pulled, and the elastic band is used to adapt to the extension or deformation caused by the pulling. The cooperation of the limit frame and the limit ball is used to limit the extension length, thereby adapting to different rotation angles of the curtain, and cooperating with the rotatable display component to achieve mutual angle coordination, so that the three-dimensional model can be accurately and clearly projected on the curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 for Figure 1 A magnified view of the structure at center;

[0022] Figure 3 for Figure 1 A magnified view of the structure at B in the middle;

[0023] Figure 4 It is a schematic diagram of the installation structure of the display screen of the present invention on the storage rack;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the display platform of the present invention;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the rotating frame of the present invention;

[0026] Figure 7 It is a schematic diagram of a three-dimensional structure in which a display assembly of the present invention is rotatably mounted on a rotating frame;

[0027] Figure 8 It is a schematic diagram of the rotating frame structure of the present invention.

[0028] In the figure: 1, ground rail; 2, top beam; 3, connecting rod; 4, circular rail; 5, rotating frame; 6, connecting block; 7, extension arm; 8, rotating groove; 9, rotating motor; 10, inner frame; 11, display component; 12, lifting frame; 13, pull rope; 14, first spring; 15, positioning rod; 16, tooth plate; 17, side frame; 18, mobile frame; 19, roller; 20, lifting rod; 21, connecting roller; 22, screw rod; 23, driving member; 2 4. Bottom block; 25. Second spring; 26. Linking gear; 27. Driven gear; 28. Side groove; 29. ​​Positioning rotating block; 30. Positioning arc groove; 31. Rotating block; 32. Camera; 33. Crossbeam; 34. Storage arc plate; 35. Display curtain; 36. Elastic band; 37. Storage roller; 38. Ring; 39. Limiting ball; 40. Inner shaft; 41. Pressing groove; 42. Pressing rod; 43. Ball groove; 44. Limiting rack; 45. Storage rack. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figures 1 to 8 , the present invention provides a technical solution:

[0031] A multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component includes an adjustment component, the adjustment component includes a storage rack 45 and a circular track 4, the storage rack 45 is provided with a motor-driven storage roller 37, a display platform is rotatably wrapped around the storage roller 37, and a rotatable and adjustable display component 11 is provided on the circular track 4, the display component 11 includes a rotating block 31 and a camera 32, and the camera 32 is facing the display platform.

[0032] The position of the display platform is defined by the storage rack 45 , and the position of the display assembly 11 is defined by the circular rail 4 .

[0033] The display platform includes a display curtain 35, an elastic band 36, a ring 38 and a limiting ball 39. The ring 38 is fixedly sleeved on the storage roller 37. The storage frame 45 is provided with an inner shaft 40 driven by a motor. The storage roller 37 is fixedly sleeved on the inner shaft 40. A pressing groove 41 is provided on the outer wall of the storage roller 37. A pressing rod 42 is inserted in the pressing groove 41 to press the ring 38 onto the inner wall of the pressing groove 41. The end of the pressing rod 42 is fixedly sleeved on the inner shaft 40. The outer diameter of the pressing rod 42 is smaller than the inner diameter of the pressing groove 41.

[0034] By fixing and pressing the pressing rod 42 in the pressing groove 41, the position of the ring 38 is limited to prevent the ring 38 from rotating, so that one end of the display curtain 35 is fixedly installed on the storage roller 37. As the storage roller 37 rotates, the display curtain 35 can be rotatably wound and stored on the storage roller 37, so as to achieve convenient storage and reduce the problem of occupying space.

[0035] An elastic band 36 is connected to the outer wall of the ring 38, and the other end of the elastic band 36 is connected to the display curtain 35, and the other end of the display curtain 35 is connected to the moving component. The lower end of the connecting block 6 is provided with a ground rail 1, and a moving component is installed on the ground rail 1 for transverse sliding. The moving component includes a moving frame 18, and a roller 19 is provided at the lower end of the moving frame 18. The roller 19 is located in the ground rail 1, and a lifting rod 20 is provided at the upper end of the moving frame 18. The upper end of the lifting rod 20 is provided with a connecting roller 21, and the connecting roller 21 is fixedly connected to one end of the display curtain 35.

[0036] The position of the moving frame 18 is limited by setting the ground rail 1 to ensure the lateral and smooth sliding of the moving frame 18. Then, with the traction of the moving frame 18 and the connecting roller 21, the display curtain 35 is unfolded. The lifting height of the lifting rod 20 is adjusted to control the extension angle of the display curtain 35, thereby achieving the purpose of angle adjustment.

[0037] A limiting frame 44 is provided at both ends of the storage rack 45. A ball groove 43 is penetrated on the limiting frame 44. The elastic band 36 slides and extends along the ball groove 43, and limiting balls 39 located in the inner cavity of the limiting frame 44 are provided at the two side ends of the elastic band 36. The outer diameter of the limiting ball 39 is larger than the inner diameter of the ball groove 43. The thickness of the through port on the ball groove 43 is equal to the thickness of the elastic band 36, and the limiting ball 39 is pressed into the ball groove 43.

[0038] During the lifting and lowering adjustment of the lifting rod 20 , since the position of the movable frame 18 is fixed, the vertical adjustment will cause the display curtain 35 to be stretched and deformed. The deformation and stretching range of the display curtain 35 is limited by the cooperation of the limiting frame 44 and the limiting ball 39 .

[0039] The display assembly 11 is rotatably mounted on the rotating frame 5, and an extension arm 7 is provided on the outer wall of the rotating frame 5. The upper end of the circular rail 4 is fixedly mounted on the top beam 2 through a connecting rod 3. A rotating groove 8 is provided on the circular rail 4, and the extension arm 7 is rotatably mounted on the rotating groove 8. A connecting block 6 is provided at the lower end of the circular rail 4, and a storage rack 45 is installed on the connecting block 6. An inner frame 10 is provided on the inner side of the rotating frame 5, and the inner frame 10 is driven by a rotating motor 9, and the upper end of the rotating motor 9 is fixed on the top beam 2. The display assembly 11 is installed on the rotating frame 5, and a rotating block 31 is rotatably mounted on the inner side of the rotating frame 5, and a driven tooth 27 is provided on the rotating block 31. A linkage tooth 26 meshing with the driven tooth 27 is provided on the inner side of the rotating frame 5, and a driving device for driving the linkage tooth 26 to rotate is provided on the rotating frame 5.

[0040] The driving device drives the linkage gear 26 and the driven gear 27 to adjust the up and down angles of the camera 32, thereby ensuring that the model is accurately projected on the display curtain 35. The inner frame 10 and the rotating motor 9 are used to drive the rotating frame 5 to move as a whole, so that the camera 32 moves in a circle along the upper end of the display curtain 35, so as to fully display the circumferential angle of the model.

[0041] During actual use, first, by utilizing the cooperation of the pressure rod 42, the pressure groove 41 and the collar 38, one end of the display curtain 35 is fixedly installed in the storage roller 37, and the other end of the display curtain 35 is connected to the lifting rod 20 and the moving frame 18. The display curtain 35 is unfolded by utilizing the lateral movement of the moving frame 18, and the height of the lifting rod 20 is adjusted to achieve the angle adjustment of the display curtain 35. The driving device drives the linkage gear 26 and the driven gear 27, thereby achieving the adjustment of the up and down angles of the camera 32, thereby ensuring that the model is accurately projected on the display curtain 35.

[0042] After projection, in order to fully display the front and back and even circumferential angles of the model, the inner frame 10 and the rotating motor 9 are used to drive the rotating frame 5 to move as a whole, so that the camera 32 moves in a circle along the upper end of the display curtain 35, thereby facilitating the full display of the circumferential angles of the model.

[0043] Embodiment 2: On the basis of Embodiment 1, in order to realize convenient adjustment of the upper and lower angles of the camera 32, the driving device includes a tooth plate 16, one side of the tooth plate 16 is vertically slidably inserted in the side groove 28 extending vertically on the inner side of the rotating frame 5, and the other side of the tooth plate 16 is provided with a rack meshing with the linkage tooth 26, and the lower end of the rotating frame 5 is provided with a side frame 17, the lower end of the tooth plate 16 is slidably inserted in the side frame 17, and the lower end of the tooth plate 16 is provided with a bottom block 24, and the lower end of the side frame 17 is provided with a screw rod 22 which is threadedly installed, the upper end of the screw rod 22 is connected to the bottom block 24, and the lower end of the screw rod 22 is driven by the driving member 23, and a second spring 25 is sleeved on the screw rod 22, the upper end of the second spring 25 is against the bottom block 24, and the lower end of the second spring 25 is against the inner wall of the side frame 17.

[0044] By setting the cooperation between the lead screw 22 and the tooth plate 16, the driving member 23 is extended to a position at the same height as the display curtain 35, so as to facilitate manual adjustment. The lead screw 22 drives the thread of the tooth plate 16 to adjust the upper and lower heights of the tooth plate 16. During the up and down movement of the tooth plate 16, the linkage tooth 26 is driven to rotate, so that the driven tooth 27 drives the rotating block 31 to adjust the upper and lower angles. By setting the second spring 25, the tooth plate 16 is elastically supported to maintain the stability of the adjusted angle.

[0045] Embodiment 3: Based on Embodiment 2, a positioning rotating block 29 is provided on the front and rear side walls of the rotating block 31 , a semicircular positioning arc groove 30 is provided on the rotating frame 5 , and the positioning rotating block 29 is slidably installed in the positioning arc groove 30 .

[0046] By arranging the cooperation between the positioning rotating block 29 and the positioning arc groove 30, the stable rotation of the rotating block 31 is ensured.

[0047] The rotating frame 5 is provided with a storage arc plate 34 which is coaxially distributed with the driven gear 27. The end of the camera 32 can be rotated to the lower end of the storage arc plate 34. A crossbeam 33 is arranged vertically and horizontally on the upper end of the rotating frame 5. The rotating block 31 is provided with a pull rope 13 which passes through the storage arc plate 34 and the crossbeam 33. The end of the pull rope 13 extends to the upper end of the crossbeam 33 and is fixedly connected to the lifting frame 12.

[0048] When not in use, the rotating block 31 is rotated to make the camera 32 deflect upward and be located in the storage arc plate 34, so as to protect the camera 32. The pull rope 13 is used to elastically pull the camera 32, so as to further ensure the stability of the angle adjustment of the camera 32.

[0049] A first spring 14 is disposed at the lower end of the lifting frame 12 . The first spring 14 is pressed between the cross beam 33 and the lifting frame 12 . Positioning rods 15 that slide through the cross beam 33 are disposed on both sides of the lifting frame 12 .

[0050] By setting the first spring 14, the elastic installation of the lifting frame 12 is achieved, so that the upper end of the pull rope 13 is elastically pulled. When the camera 32 deflects downward, the first spring 14 is compressed, and the pull rope 13 is in a state of elastic traction. The toothed plate 16 drives the camera 32 to move downward, and the other end of the camera 32 has a tendency to move upward, so that the stability of the camera 32 is achieved, thereby avoiding shaking during the rotation process and affecting the display accuracy.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component, comprising an adjustment component, the adjustment component comprising a storage rack (45) and a circular rail (4), the storage rack (45) being provided with a motor-driven storage roller (37), the storage roller (37) being rotatably wound with a display platform, the circular rail (4) being provided with a rotatable and adjustable display component (11), the display component (11) comprising a rotating block (31) and a camera (32), the camera (32) being directly facing the display platform, characterized in that: The display platform comprises a display screen (35), an elastic band (36), a sleeve (38) and a limiting ball (39); the sleeve (38) is fixedly sleeved on the storage roller (37); the outer wall of the sleeve (38) is connected with the elastic band (36); the other end of the elastic band (36) is connected to the display screen (35); the other end of the display screen (35) is connected to the moving component; both ends of the storage rack (45) are provided with limiting racks (44); a ball groove (43) is penetrated by the limiting rack (44); the elastic band (36) slides and extends through the ball groove (43); and limiting balls (39) located in the inner cavity of the limiting rack (44) are provided at both side ends of the elastic band (36); the outer diameter of the limiting ball (39) is greater than the inner diameter of the ball groove (43); the thickness of the through port on the ball groove (43) is equal to the thickness of the elastic band (36); and the limiting ball (39) is pressed into the ball groove (43); The storage rack (45) is provided with an inner shaft (40) driven by a motor, the storage roller (37) is fixedly sleeved on the inner shaft (40), the outer wall of the storage roller (37) is provided with a pressing groove (41), a pressing rod (42) is inserted into the pressing groove (41) for pressing the ring (38) on the inner wall of the pressing groove (41), the end of the pressing rod (42) is fixedly sleeved on the inner shaft (40), the outer diameter of the pressing rod (42) is smaller than the inner diameter of the pressing groove (41), the display assembly (11) is rotatably mounted on the rotating rack (5), the outer wall of the rotating rack (5) is provided with an extension arm (7), the upper end of the circular rail (4) is fixedly mounted via a connecting rod (3) The invention relates to a device for mounting a storage device on a top beam (2). The circular rail (4) is provided with a rotation groove (8). The extension arm (7) is rotatably mounted on the rotation groove (8). The lower end of the circular rail (4) is provided with a connection block (6). The storage rack (45) is mounted on the connection block (6). The lower end of the connection block (6) is provided with a ground rail (1). A moving assembly is laterally slidably mounted on the ground rail (1). The moving assembly comprises a moving frame (18). The lower end of the moving frame (18) is provided with a roller (19). The roller (19) is located in the ground rail (1). The upper end of the moving frame (18) is provided with a lifting rod (20). The upper end of the lifting rod (20) is provided with a connecting rod. The roller (21) is fixedly connected to one end of the display curtain (35); an inner frame (10) is arranged on the inner side of the rotating frame (5); the inner frame (10) is driven by a rotating motor (9); the upper end of the rotating motor (9) is fixed on the top beam (2); the display assembly (11) is mounted on the rotating frame (5); the rotating block (31) is rotatably mounted on the inner side of the rotating frame (5); a driven tooth (27) is arranged on the rotating block (31); a linkage tooth (26) meshing with the driven tooth (27) is arranged on the inner side of the rotating frame (5); and a driving device for driving the linkage tooth (26) to rotate is arranged on the rotating frame (5). The driving device comprises a tooth plate (16), one side of the tooth plate (16) is vertically slidably inserted into a side groove (28) extending vertically inside the rotating frame (5), the other side of the tooth plate (16) is provided with a rack meshingly connected with the linkage tooth (26), the lower end of the rotating frame (5) is provided with a side frame (17), the lower end of the tooth plate (16) is slidably inserted into the side frame (17), and the lower end of the tooth plate (16) is provided with a bottom block (24), the lower end of the side frame (17) is provided with a screw rod (22) rotatably installed by a thread, the upper end of the screw rod (22) is connected to the bottom block (24), and the lower end of the screw rod (22) is driven by a driving member (23).

2. The multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component according to claim 1, characterized in that: A second spring (25) is sleeved on the screw rod (22), the upper end of the second spring (25) abuts against the bottom block (24), and the lower end of the second spring (25) abuts against the inner wall of the side frame (17).

3. The multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component according to claim 1, characterized in that: A positioning rotating block (29) is arranged on the front and rear side walls of the rotating block (31); a semicircular positioning arc groove (30) is arranged on the rotating frame (5); the positioning rotating block (29) is slidably installed in the positioning arc groove (30); a storage arc plate (34) coaxially distributed with the driven gear (27) is arranged on the rotating frame (5); and the end of the camera (32) can be rotated to the inner side of the lower end of the storage arc plate (34).

4. The multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component according to claim 3, characterized in that: A crossbeam (33) is arranged transversely and vertically at the upper end of the rotating frame (5), and a pull rope (13) is arranged on the rotating block (31) and passes through the storage arc plate (34) and the crossbeam (33), and the end of the pull rope (13) extends to the upper end of the crossbeam (33) and is fixedly connected to the lifting frame (12).

5. The multi-dimensional dynamic three-dimensional visualization platform display angle adjustment component according to claim 4, characterized in that: A first spring (14) is provided at the lower end of the lifting frame (12), and the first spring (14) is pressed between the cross beam (33) and the lifting frame (12). Positioning rods (15) that slide through the cross beam (33) are provided on both sides of the lifting frame (12).

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