A height-adjustable small gantry crane

Abstract

The utility model relates to the technical field of gantry cranes, specifically a height-adjustable small gantry crane, comprising a horizontal frame, a vertical frame, and a universal wheel. A hoisting member is arranged on the horizontal frame, and the vertical frame comprises a base, and a vertical inner rod is arranged on the base. The inner rod is slidably connected with a sleeve, and the base is respectively provided with a slide groove on the left and right sides of the inner rod, and a sliding member is slidably connected inside the slide groove, and one end of a support rod is rotatably connected to the sliding member, and the other end of the support rod is rotatably connected with the sleeve, and a limit plate is protruded outwardly at the lower end of the sleeve, and a plurality of first through holes are opened on the limit plate in the circumferential direction of the rotation axis of the sleeve and the support rod, and a second through hole is correspondingly opened on the support rod. The utility model can adjust the height of the horizontal frame through the inner rod and the sleeve, and then adjust the overall height of the small gantry crane, and the relative fixation of the limit plate and the support rod is achieved by docking the first through hole with the second through hole, so as to prevent the sleeve from sliding down and deviating from the preset sliding position during the lifting of goods.

Description

Technical Field

[0001] The utility model relates to the technical field of gantry cranes, in particular to a small gantry crane with adjustable height. Background Art

[0002] As a lifting tool, a gantry crane is a bridge-type crane with a horizontal bridge frame set on two legs to form a portal shape. It is mainly used for handling and installation operations in open-air storage yards, docks, power stations, ports and railway freight stations. Conventional gantry cranes are limited in their mobile position and are large in size. They are not suitable for some occasions with small loads and limited working space. With the advancement of technology, small gantry cranes with smaller size, strong mobility and smaller loads have gradually appeared on the market. They are used for handling equipment inside small factories, loading and unloading goods in warehouses, lifting and repairing equipment, and transporting materials.

[0003] However, most of the small gantry cranes currently adopt a fixed-height structural design, and the overall height of the equipment cannot be adjusted. Small gantry cranes with a low overall height are not suitable for most lifting occasions, and small gantry cranes with a high overall height are extremely inconvenient to transport. As a result, small gantry cranes cannot adapt to the needs of operations at different heights, have a limited scope of use, poor flexibility, and low practicality. Utility Model Content

[0004] The purpose of the utility model is to provide a height-adjustable small gantry crane in view of the deficiencies in the prior art, thereby solving the problems that the overall height of small and medium-sized gantry cranes in the prior art cannot be adjusted, the scope of use is limited, and the practicality is not high.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A height-adjustable small gantry crane comprises a transversely arranged cross frame, two vertical frames arranged vertically below the cross frame, and universal wheels connected to the bottom of the vertical frames. The cross frame is provided with a lifting part, and the vertical frame comprises a base connected to the top of the universal wheel, and a vertical inner rod is provided on the base. A sleeve is slidably connected to the outer side of the inner rod, and the top of the sleeve is connected to the cross frame. The base is provided with slide grooves on the left and right sides of the inner rod respectively, and a sliding member is slidably connected inside the slide groove. One end of the support rod is rotatably connected to the sliding member, and the other end of the support rod is rotatably connected to the sleeve. A limit plate is protruding outward from the lower end of the sleeve, and a plurality of first through holes are opened on the limit plate in the circumferential direction of the rotation axis of the sleeve and the support rod, and a second through hole is correspondingly opened on the support rod, and the relative fixation of the limit plate and the support rod is achieved by docking the first through hole with the second through hole.

[0007] Furthermore, a third through hole is provided on the limit plate, a seventh through hole coaxial with the third through hole is provided on the sleeve, and correspondingly, a plurality of fourth through holes are provided on the inner rod. The relative fixation of the inner rod and the sleeve can be achieved by docking the third through hole, the fourth through hole and the seventh through hole.

[0008] Furthermore, a plurality of fifth through holes are provided on the slide groove, and a sixth through hole is provided on the sliding member correspondingly, and the slide groove and the sliding member are relatively fixed by docking the fifth through holes with the sixth through holes.

[0009] Furthermore, a rack is provided inside the sliding groove, and a sliding spring piece for pre-positioning the sliding position of the sliding member is connected to the lower part of the sliding member.

[0010] Furthermore, the sliding elastic sheet includes a protrusion abutting against the rack, and a clamping portion for clamping and fixing the sliding elastic sheet on the sliding member.

[0011] Furthermore, when the sleeve is in contact with the base, the support rod is parallel to the base, and the support rod is not higher than the upper surface of the slide groove.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model provides a vertical inner rod and a sleeve slidably sleeved on the outer side of the inner rod, and the height of the cross frame can be freely adjusted according to the use requirements, thereby adjusting the overall height of the small gantry crane, thereby improving the overall flexibility and practicality of the equipment; support rods are respectively connected to the left and right sides of the sleeve, and the two ends of the support rod are respectively rotatably connected to the sleeve and the rotating member, and at the same time, a plurality of first through holes for positioning are opened on the limit plate, and a second through hole is correspondingly opened on the support rod, and the relative fixation of the limit plate and the support rod is achieved by docking the first through hole with the second through hole, while improving the stability of the equipment, preventing the sleeve from sliding down and deviating from the preset sliding position during the process of lifting goods, thereby effectively ensuring the personal safety of the staff, and the docking of different first through holes with the second through holes can limit the sleeves in multiple sliding positions, and the staff can arbitrarily select a suitable height for locking, so as to flexibly match a variety of different lifting requirements.

[0014] In addition, a third through hole is provided on the limit plate and a seventh through hole coaxial with the third through hole is provided on the sleeve, and a plurality of fourth through holes are provided on the inner rod correspondingly, and the relative fixation of the sleeve and the inner rod can be achieved by docking the third through hole and the seventh through hole with different fourth through holes; a plurality of fifth through holes are provided on the slide groove, and a sixth through hole is provided on the sliding member correspondingly, and the relative fixation of the slide groove and the sliding member can be achieved by docking the sixth through hole with different fifth through holes, thereby further effectively limiting the sleeves at a plurality of different sliding positions.

[0015] In addition, through the cooperation between the rack inside the slide groove and the sliding spring piece under the sliding part, temporary supporting force is provided for the support rod in the inclined state and the sleeve after sliding upward, effectively preventing the sleeve connected to the support rod from automatically sliding down due to its own gravity, making it convenient for the staff to independently complete the positioning action of the sleeve, improving the convenience of the positioning action, and at the same time making it convenient for the staff to quickly and accurately penetrate the bolts through the fifth through hole and the sixth through hole, thereby realizing the relative fixation of the sliding part and the slide groove.

[0016] At the same time, when the small gantry crane is not working or is being moved and transported, the support rod can be completely stored in the slide slot, which is convenient for moving, transporting and storing the small gantry crane and minimizing the size of the small gantry crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of a height-adjustable small gantry crane in an initial state provided by the utility model;

[0018] Figure 2 A schematic diagram of the overall structure of a height-adjustable small gantry crane provided by the utility model after the height adjustment is completed;

[0019] Figure 3 A front cross-sectional view of a height-adjustable small gantry crane provided by the utility model in an initial state;

[0020] Figure 4 A front sectional view of a height-adjustable small gantry crane provided by the utility model after the height adjustment is completed;

[0021] Figure 5 for Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0022] Figure 6 A schematic diagram of the structure of a vertical frame of a height-adjustable small gantry crane provided by the utility model;

[0023] Figure 7 A schematic diagram of the structure of a base and an inner rod in a height-adjustable small gantry crane provided by the utility model;

[0024] Figure 8 The utility model provides a structural schematic diagram of a sliding member and a sliding spring in a height-adjustable small gantry crane.

[0025] Wherein, the accompanying drawings are marked as follows:

[0026] 1. Horizontal frame; 11. Lifting piece; 2. Vertical frame; 21. Base; 22. Inner rod; 221. Fourth through hole; 23. Sleeve; 231. Seventh through hole; 24. Slide groove; 241. Fifth through hole; 242. Rack; 25. Sliding piece; 251. Sixth through hole; 252. Sliding spring; 2521. Protrusion; 2522. Clamping part; 26. Limiting plate; 261. First through hole; 262. Third through hole; 27. Support rod; 3. Universal wheel. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0031] For easier understanding, see Figures 1 to 7The present embodiment provides a height-adjustable small gantry crane, which includes a horizontal frame 1, a vertical frame 2, and a universal wheel 3 from top to bottom. The front and rear ends of the horizontal frame 1 are detachably connected to the vertical frame 2 through adapters, and the left and right ends of the vertical frame 2 are detachably connected to the universal wheel 3. The horizontal frame 1 is provided with a lifting part 11 for lifting goods. The main body of the small gantry crane is made of aluminum alloy, which ensures that the overall strength of the equipment is sufficient while making the overall weight of the equipment lighter. The vertical frame 2 includes a base 21, and the bottom of the left and right ends of the base 21 are respectively connected to the universal wheel 3. An inner rod 22 extends vertically upward from the middle of the base 21, and a sleeve 23 is provided on the outer side of the inner rod 22. The sleeve 23 is a hollow structure. The outer wall of the inner rod 22 is slidably connected to the inner wall of the sleeve 23, and the upper end of the sleeve 23 is connected to the horizontal frame 1. The base 21 is provided with a slide groove 24 on the left and right sides of the inner rod 22, and a sliding member 25 is slidably connected inside the slide groove 24. The upper part of the sliding member 25 is rotatably connected to one end of the support rod 27, and the other end of the support rod 27 is rotatably connected to the lower end of the side of the sleeve 23. A stop plate 26 is protruded outwardly at the lower end of the front face of the sleeve 23, and the stop plate 26 is fixedly connected to the sleeve 23. Four horizontal first through holes 261 are respectively opened on the left and right sides of the stop plate 26 in the circumferential direction of the rotation axis of the sleeve 23 and the support rod 27, and a second through hole is correspondingly opened on the support rod 27. After the bolt passes through the first through hole 261 and the second through hole in sequence, a nut is sleeved on the end of the bolt rod, so that the stop plate 26 and the support rod 27 can be relatively fixed, that is, the angle between the support rod 27 and the base 21 is locked.

[0032] In the initial state, the bottom wall of the sleeve 23 is in contact with the upper wall of the base 21, the inner rod 22 is completely hidden and wrapped in the sleeve 23, and the support rod 27 and the base 21 are in a state of parallelism. When it is necessary to adjust the overall height of the vertical frame 2, the sleeve 23 is slid vertically upward to separate the bottom wall of the sleeve 23 from the upper wall of the base 21, and the inner rod 22 is gradually exposed as the sleeve 23 slides; since the two side ends of the support rod 27 are respectively slidably connected to the lower end of the sleeve 23 and the sliding member 25, when the sleeve 23 slides upward, the support rods 27 respectively connected to the left and right sides of the sleeve 23 and the sliding member 25 rotatably connected to the support rod 27 are driven to move, and the sliding member 25 gradually approaches the inner rod 22, and the angle between the support rod 27 and the base 21 gradually increases. ; When the overall height of the vertical frame 2 reaches the preset value, stop sliding the sleeve 23 upward. At this time, a first through hole 261 on the left side of the limiting plate 26 is coaxial with the second through hole on the left support rod 27. After the bolt passes through the first through hole 261 and the second through hole in sequence, a nut is sleeved on the end of the bolt rod to achieve relative fixation of the left support rod 27 and the limiting plate 26. Repeat the above operation to achieve relative fixation of the right support rod 27 and the limiting plate 26, thereby limiting the sliding position of the sleeve 23, and completing the adjustment of the overall height of the vertical frame 2.

[0033] For easier understanding, please continue to refer to Figures 1 to 7 A third horizontal through hole 262 is provided in the middle of the front side of the limiting plate 26, a seventh through hole 231 coaxial with the third through hole 262 is provided on the back side of the sleeve 23, and four fourth through holes 221 are provided on the inner rod 22 correspondingly. A bolt is sequentially passed through the third through hole 262 of the limiting plate 26, the fourth through hole 221 of the inner rod 22, and the seventh through hole 231 of the sleeve 23, and then a nut is sleeved on the end of the bolt rod, so that the sleeve 23 and the inner rod 22 can be relatively fixed. Since the limiting plate 26 is fixedly arranged on the lower end of the front side of the sleeve 23, the limiting plate 26, the sleeve 23, and the inner rod 22 are relatively fixed, and the sliding position of the sleeve 23 is further limited.

[0034] For easier understanding, please continue to refer to Figures 1 to 7 Four fifth horizontal through holes 241 are respectively formed on the left and right slide grooves 24, and a sixth through hole 251 is correspondingly formed on the sliding member 25. Bolts are sequentially penetrated through the fifth through hole 241, the sixth through hole 251 on the front side of the slide groove 24, and the fifth through hole 241 on the back side of the slide groove 24, and then a nut is sleeved on the end of the bolt rod, so that the sliding member 25 and the slide groove 24 can be relatively fixed, and the sliding position of the sliding member 25 can be limited.

[0035] For easier understanding, see Figures 6 to 8A rack 242 is provided inside the slide groove 24, and a sliding spring 252 is fixedly connected to the lower part of the sliding member 25. The sliding spring 252 includes an arc-shaped protrusion 2521 abutting against the rack 242 and a clamping portion 2522 for clamping and fixing on the sliding member 25. The sliding spring 252 is used to pre-position the sliding position of the sliding member 25. The protrusion 2521 of the sliding spring 252 can undergo a large elastic deformation when loaded, converting mechanical work or kinetic energy into deformation energy, and the deformation of the sliding spring 252 will disappear and return to its original state after unloading. The sliding process of the sliding spring 252 on the rack 242 is an intermittent loading and unloading process. In the initial state, when the protrusion 2521 of the sliding spring piece 252 abuts against the tooth root of the rack 242, the protrusion 2521 of the sliding spring piece 252 is in an unloaded (unstressed) state; during the sliding process of the sliding member 25, the protrusion 2521 of the sliding spring piece 252 slides from the tooth root of the rack 242 to the tooth top, that is, when the protrusion 2521 of the sliding spring piece 252 abuts against the tooth top of the rack 242, the sliding spring piece 252 is in a loaded state, and the protrusion 2521 will shrink and deform inward; until the sliding spring piece 252 slides from the tooth top to the tooth root, that is, when the protrusion 2521 of the sliding spring piece 252 abuts against the tooth root of the rack 242 again, the sliding spring piece 252 is unloaded, and the protrusion 2521 returns to the original arc shape. The sliding spring piece 252 is preferably made of hardware material and has good resilience. When the staff positions the sleeve 23 by means of bolts, the sleeve 23 will often automatically slide downward due to its own gravity, deviating from the preset sliding position, thereby driving the support rod 27 and the sliding member 25 to move. Therefore, the positioning action of the sleeve 23 requires the cooperation of multiple people to complete, and the staff cannot complete the positioning action of the sleeve 23 alone, which is extremely inconvenient. Through the mutual cooperation between the sliding spring piece 252 and the rack 242, it can ensure that the sliding member 25 has a pre-positioning function when the sliding function is normal, that is, when the protrusion 2521 of the sliding spring piece 252 abuts against the root of the rack 242, it can play a preliminary role in limiting the sliding position of the sliding member 25 at this time, providing temporary support force for the support rod 27 in an inclined state and the sleeve 23 after sliding upward, effectively preventing the sleeve 23 connected to the support rod 27 from automatically sliding down due to its own gravity, making it convenient for the staff to independently complete the positioning action of the sleeve 23, and improving the convenience of the positioning action. At the same time, the fifth through hole 241 on the slide groove 24 is opened just above the root of the rack 242, and the corresponding sixth through hole 251 in the middle of the sliding member 25 is opened just above the protrusion 2521 of the sliding spring 252, that is, when the protrusion 2521 of the sliding spring 252 is located at the root of the rack 242, the fifth through hole 241 and the sixth through hole 251 are coaxial, which is convenient for the staff to quickly and accurately penetrate the bolts through the fifth through hole 241 and the sixth through hole 251, so as to achieve the relative fixation of the sliding member 25 and the slide groove 24.

[0036] Furthermore, in the initial state, the bottom wall of the sleeve 23 abuts against the upper wall of the middle part of the base 21. At this time, the support rod 27 and the base 21 are in a parallel state, and the outer side wall of the support rod 27 is not higher than the upper surface of the slide groove 24, that is, the support rod 27 can be completely received in the slide groove 24, which is convenient for moving, transporting and storing the vertical frame 2, thereby minimizing the volume of the small gantry crane.

[0037] The use of the utility model:

[0038] After assembling a horizontal frame 1, two vertical frames 2 and four universal wheels 3 into a complete small gantry crane, the small gantry crane is moved to the work site through the universal wheels 3; when the overall height of the small gantry crane needs to be adjusted, the staff slides the sleeve 23 of the vertical frame 2 on one side upwards. Since the sleeves 23 of the vertical frames 2 on both sides are connected to the horizontal frame 1, when the sleeve 23 on one side slides upwards, the horizontal frame 1 and the sleeve 23 on the other side are driven to slide upwards together; when the sleeve 23 slides to the preset position, that is, the horizontal frame 1 reaches the preset After the height is adjusted, the sliding position of the sliding member 25 is pre-positioned by the cooperation of the sliding spring piece 252 and the rack 242, thereby providing temporary support for the support rod 27 and the sleeve 23. During this period, the staff relatively fixes the sleeve 23 and the inner rod 22, the limit plate 26 and the support rod 27, the sliding member 25 and the slide groove 24 respectively by bolt connection, so as to limit the sliding position of the sleeve 23, and then lock the current height of the small gantry crane, thereby completing the adjustment of the overall height of the small gantry crane.

[0039] Although the present invention has been described using the above preferred embodiments, it is not intended to limit the scope of protection of the present invention. Any person skilled in the art may make various changes and modifications to the above embodiments without departing from the spirit and scope of the present invention, and the changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A height-adjustable small gantry crane, comprising a horizontally arranged horizontal frame (1), two vertical frames (2) arranged vertically below the horizontal frame (1), and universal wheels (3) connected below the vertical frames (2), wherein a hoisting member (11) is provided on the horizontal frame (1), and characterized in that: The vertical frame (2) comprises a base (21) connected to the top of the universal wheel (3), a vertical inner rod (22) is provided on the base (21), a sleeve (23) is slidably connected to the outer side of the inner rod (22), the top of the sleeve (23) is connected to the horizontal frame (1), and the base (21) is provided with a slide groove (24) on the left and right sides of the inner rod (22), a sliding member (25) is slidably connected inside the slide groove (24), and a support rod (27) is rotatably connected to the sliding member (25). One end of the support rod (27) is rotatably connected to the sleeve (23); a limit plate (26) is protruding outward from the lower end of the sleeve (23); the limit plate (26) is provided with a plurality of first through holes (261) in the circumferential direction of the rotation axis of the sleeve (23) and the support rod (27); and a second through hole is correspondingly provided on the support rod (27); and the relative fixation of the limit plate (26) and the support rod (27) is achieved by docking the first through holes (261) with the second through holes.

2. The height-adjustable small gantry crane according to claim 1, characterized in that: The limiting plate (26) is provided with a third through hole (262), the sleeve (23) is provided with a seventh through hole (231) coaxial with the third through hole (262), and a plurality of fourth through holes (221) are correspondingly provided on the inner rod (22), and the inner rod (22) and the sleeve (23) can be relatively fixed by docking the third through hole (262), the fourth through hole (221) and the seventh through hole (231).

3. The height-adjustable small gantry crane according to claim 1, characterized in that: The slide groove (24) is provided with a plurality of fifth through holes (241), and a sixth through hole (251) is correspondingly provided on the sliding member (25), and the slide groove (24) and the sliding member (25) are relatively fixed by docking the fifth through holes (241) with the sixth through holes (251).

4. The height-adjustable small gantry crane according to claim 1 or 3, characterized in that: A rack (242) is provided inside the sliding groove (24), and a sliding spring (252) for pre-positioning the sliding position of the sliding member (25) is connected to the lower part of the sliding member (25).

5. The height-adjustable small gantry crane according to claim 4, characterized in that: The sliding elastic sheet (252) comprises a protruding portion (2521) abutting against the rack (242), and a clamping portion (2522) used to clamp and fix the sliding elastic sheet (252) on the sliding member (25).

6. The height-adjustable small gantry crane according to claim 1, characterized in that: When the sleeve (23) is in contact with the base (21), the support rod (27) is parallel to the base (21), and the support rod (27) is not higher than the upper surface of the slide groove (24).

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