Connecting rod lifting device

Abstract

The connecting rod lifting device comprises a bottom frame, a lower connecting rod, an upper connecting rod, a tray frame and a pull rod, the bottom frame is assembled on an installation table top, one end of the lower connecting rod is hinged to the bottom frame, one end of the upper connecting rod is hinged to the tray frame, and the pull rod is hinged to the other end of the lower connecting rod and the other end of the upper connecting rod. The lifting device can work in various narrow and inconvenient spaces, the appearance structure of the lifting device is regular, positioning is rapid, positioning errors are reduced, and the positioning frequency is reduced at the same time; the structural design is simple, the manufacturing cost is low, the occupied space is small, and the installation mode is flexible; the self-adaptive adjustability is relatively high, the mechanism is simpler, more reliable and safer, and a self-locking function is achieved in the lifting process; the structural design has self-stability, limiting devices in the horizontal direction and the vertical direction are arranged, and the lifting stroke is stable and gentle; interfaces with high applicability are provided on two sides, and driving in different modes can be realized by replacing a rocking handle or a motor.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting devices, and particularly relates to a link lifting device. Background Art

[0002] Lifting mechanisms are widely used in fields such as construction, industrial production, and logistics warehousing. With the development of machining technology, new requirements have been put forward in the technical field of lifting mechanisms in terms of efficiency improvement, safety, and adaptation to different working environments. Currently, lifting mechanisms mainly include hydraulic, pneumatic, and electric cylinders, including traction lifting structures, hydraulic drive lifting structures, scissor lift structures, etc.

[0003] Among them, lifting mechanisms powered by hydraulic pressure are mostly used in open positions such as heavy machinery, workshops, or outdoors; lifting mechanisms powered by electric cylinders occupy relatively less space than those powered by hydraulic systems, but still require a large installation space, and the electric cylinder system is complex and the usage cost is high. At the same time, the mechanical structure of traditional lifting mechanisms determines that their installation methods are complex, they occupy a large amount of space, and there are many usage restrictions. Therefore, when a lifting mechanism is needed on small machinery or the power supply is inconvenient to connect during the processing process and the space is highly restricted, there is an urgent need for an alternative mechanical structure.

[0004] The patent document with the publication number of CN103466505A discloses a fixed manual lifting platform, which is not only simple in structure and operation, but also can adjust the platform height manually. A fixed manual lifting platform includes a base, a working platform, and a scissor lift mechanism; the scissor lift mechanism is composed of upper and lower layers of scissor assemblies. There are two groups of scissor assemblies, and each group includes an inner support rod and an outer support rod connected in an X shape. Between the two groups of scissor assemblies at the connection of the upper and lower layers of scissor assemblies, they are all connected by a transverse connecting rod. The fixed manual lifting platform also includes a linear transmission mechanism. A hand-cranking mechanism is connected to the driving member of the linear transmission mechanism, and the driven member of the linear transmission mechanism is connected to one of the transverse connecting rods. The two transverse connecting rods can be driven to approach or move away from each other through the linear transmission mechanism, thereby driving the lifting of the working platform. However, this lifting platform lacks vertical and horizontal limiting structures and is not suitable for being driven by connecting to other power sources for rotation.

[0005] The patent document with the publication number CN117773529A discloses a crank - connecting - rod - driven high - precision part press - fitting machine tool, including a frame; a base is provided on the frame; a workbench is movably arranged in a lifting manner at the bottom of the base; a guiding track is arranged on the base in the height direction; a lifting seat is slidably arranged on the guiding track; the lifting seat is connected with a lifting seat; a crank - connecting - rod driving mechanism is provided on the base; the crank - connecting - rod driving mechanism is hinged with the lifting seat; an adjustable - stroke mechanism is provided on the base; the adjustable - stroke mechanism is arranged between the lifting seat and the workbench; a triggering mechanism for triggering the adjustable - stroke mechanism to work is provided on the base. By setting the adjustable - stroke mechanism and the triggering mechanism, driven by the triggering mechanism, the distance between the workbench and the lifting seat is changed through the action of the adjustable - stroke mechanism, so that the stroke of the workbench can be changed, and the use range of the press - fitting machine tool is expanded. However, this patent is for a machine tool and cannot perform lifting operations on other non - processing parts. Summary of the Invention

[0006] To solve the above - mentioned technical problems, the present invention provides a connecting - rod lifting device.

[0007] The present invention is achieved through the following technical solutions.

[0008] A connecting - rod lifting device provided by the present invention includes a bottom frame, a lower connecting rod, an upper connecting rod, a tray frame and a pull rod. The bottom frame is assembled on an installation tabletop. One end of the lower connecting rod is hinged to the bottom frame. One end of the upper connecting rod is hinged to the tray frame. The pull rod is respectively hinged to the other ends of the lower connecting rod and the upper connecting rod.

[0009] Preferably, a fixing plate A is arranged on the bottom frame. A chute A and a lifting guiding column are arranged on the fixing plate A. The lifting guiding column passes through the fixing plate A through the chute A and is slidably connected. A chute B is arranged on the bottom frame. A hole A is arranged on one side of the chute B. The lower connecting rod is placed in the chute B and is hinged to the bottom frame through the hole A. The support rod A of the bottom frame is parallel to the pull rod.

[0010] Preferably, a chute C and a double - headed screw are arranged on the lifting guiding column. The double - headed screw passes through the lifting guiding column through the chute C.

[0011] Preferably, a connecting head is arranged at one end of the double - headed screw. The double - headed screw is connected to a crank through the connecting head. A through - hole and a handle are arranged on the crank. The crank is connected to the connecting head through the through - hole. The handle is rotatably connected to the crank.

[0012] Preferably, a rotating part is arranged on the double - headed screw, and a limiting block is arranged on the rotating part.

[0013] Preferably, the thread directions of the two ends of the double - headed screw are opposite.

[0014] Preferably, a connector A is provided on the pull rod, and a trapezoidal threaded hole is provided on the connector A. Both ends of the double-headed screw penetrate through the connector A through the trapezoidal threaded holes and are connected.

[0015] Preferably, the pull rod is hinged to the other ends of the lower connecting rod and the upper connecting rod through a hinge A. A connector B and a guide rod are provided on the pull rod. A guide hole is provided on the connector B. Both ends of the guide rod penetrate through the connector B through the guide holes and are connected.

[0016] Preferably, a shoulder is provided in the middle of the guide rod, and limit nuts are provided at both ends of the guide rod. After the guide rod penetrates through the pull rod, it is connected to the limit nuts.

[0017] Preferably, a fixing plate B is provided on the tray rack, a chute E is provided on the fixing plate B, a chute D is provided on the tray rack, a hole B is provided on one side of the chute D, the upper connecting rod is placed in the chute D, the upper connecting rod is hinged to the tray rack through the hole B, and the support rod B of the tray rack is parallel to the pull rod.

[0018] The beneficial effects of the present utility model are as follows:

[0019] The present utility model can work in various narrow and inconvenient spaces. The lifting device has a regular external structure, can quickly position, reduces the positioning error and the number of positioning times while reducing; the structure design is simple, the manufacturing cost is low, the occupied space is also small, and the installation method is flexible; the adaptive adjustment is relatively high, the mechanism is simpler, more reliable and safer, and has a self-locking function during the lifting process; the structure design has its own stability, is provided with limiting devices in both horizontal and vertical directions, and the lifting stroke is stable and gentle; high-applicability interfaces are provided on both sides, and different driving methods can be realized by replacing the crank or the motor.

[0020] Under the condition that the structure of the present utility model is simple and reliable and the manufacturing and processing are convenient, the object can be quickly lifted by placing a driving source externally under the object to be lifted. The input interface has high applicability, and different driving methods can be realized by replacing the crank or the motor, improving the applicable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural view of the present utility model;

[0022] Figure 2 is an exploded view of the present utility model;

[0023] Figure 3 is a schematic view of the crank installation of the present utility model;

[0024] Figure 4 is a schematic view of the present utility model in the descending state;

[0025] In the figure: 1 - chassis, 11 - fixing plate A, 12 - chute A, 13 - chute B, 14 - hole A, 15 - support rod A, 2 - lower connecting rod, 3 - upper connecting rod, 4 - tray rack, 41 - fixing plate B, 42 - chute E, 43 - chute D, 44 - hole B, 45 - support rod B, 5 - pull rod, 51 - connecting piece A, 52 - hinge piece A, 53 - connecting piece B, 6 - guide rod, 61 - shoulder, 7 - lifting guide post, 71 - chute C, 8 - double-headed screw, 81 - rotating part, 82 - limit block, 83 - connecting head, 9 - crank, 91 - through hole, 92 - grip, 10 - limit nut. Specific embodiments

[0026] The technical solution of the present invention will be further described below, but the scope of protection is not limited thereto.

[0027] Embodiment:

[0028] As Figures 1 to 4 shown, a link lifting device includes a chassis 1, a lower connecting rod 2, an upper connecting rod 3, a tray rack 4 and a pull rod 5. The chassis 1 is assembled on the installation tabletop. One end of the lower connecting rod 2 is hinged to the chassis 1. One end of the upper connecting rod 3 is hinged to the tray rack 4. The pull rod 5 is respectively hinged to the other ends of the lower connecting rod 2 and the upper connecting rod 3.

[0029] A fixing plate A 11 is provided on the chassis 1. A chute A 12 and a lifting guide post 7 are provided on the fixing plate A 11. The lifting guide post 7 passes through the fixing plate A 11 through the chute A 12 and is slidably connected. A chute B 13 is provided on the chassis 1. A hole A 14 is provided on one side of the chute B 13. The lower connecting rod 2 is placed in the chute B 13. The lower connecting rod 2 is hinged to the chassis 1 through the hole A 14. The support rod A 15 of the chassis 1 is parallel to the pull rod 5.

[0030] A chute C 71 and a double-headed screw 8 are provided on the lifting guide post 7. The double-headed screw 8 passes through the lifting guide post 7 through the chute C 71. The lifting guide post 7 and the double-headed screw 8 form a sliding pair for guiding the double-headed screw 8 to rise and fall in the chute C 71 of the lifting guide post 7.

[0031] A connecting head 83 is provided at one end of the double-headed screw 8. The cross section of the connecting head 83 is rectangular. The double-headed screw 8 is connected to the crank 9 through the connecting head 83. A through hole 91 and a grip 92 are provided on the crank 9. The shape of the through hole 91 corresponds to that of the connecting head 83. The crank 9 is connected to the connecting head 83 through the through hole 91. The grip 92 is rotatably connected to the crank 9. The double-headed screw 8 can also be connected to an external driving device such as a driving motor at this end.

[0032] A rotating part 81 is provided on the double-headed screw rod 8, and a limiting block 82 is provided on the rotating part 81. The rotating part 81 penetrates through the lifting guide post 7 and is rotatably connected. The limiting block 82 is located on both sides of the lifting guide post 7 and is used to fix the position of the double-headed screw rod 8 on the lifting guide post 7.

[0033] The thread directions of the two ends of the double-headed screw rod 8 are opposite, which is used to enable the two side pull rods 5 to move inward or outward simultaneously. The double-headed screw rod 8 passes through the lifting guide post 7 to form a sliding pair, which is used to guide the double-headed screw rod 8 to rise and fall in the groove of the lifting guide post 7.

[0034] A connecting piece A51 is provided on the pull rod 5, and a trapezoidal threaded hole is provided on the connecting piece A51. The two ends of the double-headed screw rod 8 respectively pass through the trapezoidal threaded hole to penetrate and connect with the connecting piece A51, and the double-headed screw rod 8 and the pull rod 5 form a threaded pair.

[0035] The pull rod 5 is hinged to the other ends of the lower connecting rod 2 and the upper connecting rod 3 through a hinge piece A52. A connecting piece B52 and a guide rod 6 are provided on the pull rod 5. A guide hole is provided on the connecting piece B52, and the two ends of the guide rod 6 respectively pass through the guide hole to penetrate and connect with the connecting piece B52.

[0036] A shoulder 61 is provided in the middle of the guide rod 6. The shoulder 61 plays a limiting role on the two side pull rods 5. Limiting nuts 10 are provided at both ends of the guide rod 6. After the guide rod 6 penetrates through the pull rod 5, it is connected to the limiting nuts 10. The limiting nuts 10 are used to constrain the lifting to always be within the effective stroke. The two ends of the guide rod 6 pass through the guide holes of the pull rod 5 to form a sliding pair.

[0037] A fixing plate B41 is provided on the tray rack 4, and a chute E42 is provided on the fixing plate B41. The lifting guide post 7 passes through the fixing plate B41 through the chute E42 and is slidably connected. A chute D43 is provided on the tray rack 4. A hole B44 is provided on one side of the chute D43. The upper connecting rod 3 is placed in the chute D43, and the upper connecting rod 3 is hinged to the tray rack 4 through the hole B44. The support rod B45 of the tray rack 4 is parallel to the pull rod 5.

[0038] A using method of the connecting rod lifting device includes the following steps:

[0039] Pre-place the connecting rod lifting device under the equipment to be lifted and adjust the position so that the tray rack 4 of the lifting device can better fit the bottom of the equipment to be lifted during the lifting process;

[0040] The connecting rod lifting device performs the lifting action: Slip the through hole 91 of the crank 9 onto the connecting part 83 at one end of the double-headed screw 8, and rotate the crank 9 to drive the double-headed screw 8 to rotate. The two pull rods 5 move outward simultaneously under the rotation of the threaded engagement with the double-headed screw 8. During the outward movement of the pull rod 5, the lower connecting rod 2 and the upper connecting rod 3 are driven to rotate, and the angle formed on the outer sides of the connected lower connecting rod 2 and upper connecting rod 3 continuously increases, causing the lower connecting rod 2 to lift the pull rod 5 and the upper connecting rod 3 to lift the tray rack 4. During the lifting process, the double-headed screw 8 slides upward in the chute C71 of the lifting guide post 7, and the pull rod 5 slides outward under the action of the guide rod 6. When the pull rod 5 contacts the limit nut 10 during the lifting process of the tray rack 4 and is thus limited, at this time the tray rack 4 is lifted to the highest position, thereby realizing the lifting function of the connecting rod lifting device;

[0041] The connecting rod lifting device performs the lowering action: Rotate the grip 92 of the crank 9 in the opposite direction of the upward movement. The two pull rods 5 move inward simultaneously under the rotation of the threaded engagement with the double-headed screw 8. During the inward movement of the pull rod 5, the lower connecting rod 2 and the upper connecting rod 3 are driven to rotate, and the angle formed on the outer sides of the connected lower connecting rod 2 and upper connecting rod 3 continuously decreases, causing the lower connecting rod 2 to pull the pull rod 5 downward and the upper connecting rod 3 to pull the tray rack 4 downward. During the lowering process, the double-headed screw 8 slides downward in the guide groove of the lifting guide post, and the pull rod 5 slides inward under the action of the guide rod 6. When the tray rack 4 descends to the lowest position when the shaft shoulder between the pull rod 5 and the guide rod 6 comes into contact, thus realizing the lowering function of the connecting rod lifting device.

Claims

1. A connecting rod lifting device, characterized in that: It includes a chassis (1), a lower connecting rod (2), an upper connecting rod (3), a tray rack (4) and a pull rod (5). The chassis (1) is assembled on the installation tabletop. One end of the lower connecting rod (2) is hinged to the chassis (1). One end of the upper connecting rod (3) is hinged to the tray rack (4). The pull rod (5) is respectively hinged to the other ends of the lower connecting rod (2) and the upper connecting rod (3). A fixing plate A (11) is arranged on the chassis (1). A chute A (12) and a lifting guide post (7) are arranged on the fixing plate A (11). The lifting guide post (7) passes through the fixing plate A (11) through the chute A (12) and is slidably connected. A chute B (13) is arranged on the chassis (1). A hole A (14) is arranged on one side of the chute B (13). The lower connecting rod (2) is placed in the chute B (13). The lower connecting rod (2) is hinged to the chassis (1) through the hole A (14). The support rod A (15) of the chassis (1) is parallel to the pull rod (5). A chute C (71) and a double-headed screw rod (8) are arranged on the lifting guide post (7). The double-headed screw rod (8) passes through the lifting guide post (7) through the chute C (71). A connecting piece A (51) is arranged on the pull rod (5). A trapezoidal threaded hole is arranged on the connecting piece A (51). The two ends of the double-headed screw rod (8) respectively pass through the trapezoidal threaded hole and are connected to the connecting piece A (51).

2. The link lifting device according to claim 1, wherein: A connecting head (83) is arranged at one end of the double-headed screw rod (8). The double-headed screw rod (8) is connected to a crank (9) through the connecting head (83). A through hole (91) and a grip (92) are arranged on the crank (9). The crank (9) is connected to the connecting head (83) through the through hole (91). The grip (92) is rotatably connected to the crank (9).

3. The link lifting device according to claim 1, characterized in that: A rotating part (81) is arranged on the double-headed screw rod (8). A limiting block (82) is arranged on the rotating part (81).

4. A link lifting device according to claim 1, characterized in that: The thread directions of the two ends of the double-headed screw rod (8) are opposite.

5. A link lifting device according to claim 1, characterized in that: The pull rod (5) is hinged to the other ends of the lower connecting rod (2) and the upper connecting rod (3) through a hinge piece A (52). A connecting piece B (53) and a guide rod (6) are arranged on the pull rod (5). A guide hole is arranged on the connecting piece B (53). The two ends of the guide rod (6) respectively pass through the guide hole and are connected to the connecting piece B (53).

6. The link lifting device according to claim 5, characterized in that: A shoulder (61) is arranged in the middle of the guide rod (6). Limiting nuts (10) are arranged at both ends of the guide rod (6). After passing through the pull rod (5), the guide rod (6) is connected to the limiting nuts (10).

7. The link lifting device according to claim 1, characterized in that: A fixing plate B (41) is arranged on the tray rack (4). A chute E (42) is arranged on the tray rack (4). A chute D (43) is arranged on the fixing plate B (41). A hole B (44) is arranged on one side of the chute D (43). The upper connecting rod (3) is placed in the chute D (43). The upper connecting rod (3) is hinged to the tray rack (4) through the hole B (44). The support rod B (45) of the tray rack (4) is parallel to the pull rod (5).

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