Indoor small crane

Abstract

The utility model discloses an indoor small crane which comprises a moving trolley, a mounting frame fixed on the moving trolley and a lifting mechanism arranged on the mounting frame, the lifting mechanism comprises a telescopic mast and a big arm base fixed with the bottom end of the telescopic mast into a whole, and the big arm base is connected with the mounting frame through a rotating shaft; a lifting rope winch is fixed on the mounting frame, a winch disc of the lifting rope winch and one end of a lifting rope are fixed into a whole, and the other end of the lifting rope bypasses a lifting rope fixed pulley block and then is fixedly provided with a lifting piece clamp; the large arm winch, the small arm winch and the lifting rope winch are all electrically connected with a control cabinet with a PLC through wires, and control buttons for controlling the large arm winch, the small arm winch and the lifting rope winch to rotate forwards or backwards are arranged on the control cabinet. Due to the adoption of the structure, the hoisting safety is improved, the mounting efficiency is improved, the labor intensity of workers is reduced, and the labor cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical cranes, and specifically relates to a small indoor crane which can improve hoisting safety, improve installation efficiency, reduce workers' labor intensity and reduce labor costs. Background Art

[0002] At present, indoor fire protection pipe networks, HVAC water pipe networks, air duct networks, fans and other living hardware within 300KG are basically installed under the beams. The indoor height is usually 3 meters to 6 meters. When workers carry out pipe network installation operations in limited spaces, they usually use scaffolding for manual transmission, lifting frame hoists, forklifts, manual hoists and other methods to lift and install.

[0003] When using scaffolding to lift and install parts, the scaffolding is used to manually transfer the parts to be installed at a height of 3-6 meters. Generally, 4-8 people are required to operate on the same platform, and the labor cost is high; the scaffolding shakes violently due to excessive movement and is prone to collapse, causing injuries; workers are prone to falling from heights due to the transmission of external forces and improper use of force, which poses a major safety hazard; it takes a long time, and it takes about 2 hours to install a 6-meter pipe, and the installation efficiency is low.

[0004] When using a lifting frame hoist to lift and install parts, it takes 4-6 people to use the lifting frame hoist to transfer the parts to be installed at a height of 3-6 meters, and the labor cost is high; since the bottom of the lifting frame hoist itself is light, it is easy to tip over and injure people when lifting the parts to be installed; in the process of lifting the parts to be installed, the parts to be installed must be balanced, otherwise the parts to be installed cannot be lifted, and adjusting the balance is time-consuming and labor-intensive; in the process of lifting the parts to be installed, the moving effect is poor and it is easy to tip over. The hanger on the parts to be installed can only be moved and adjusted manually after leaving the lifting frame hoist. The labor intensity of the workers is high and the time is long. It takes about 2 hours to install a 6-meter pipe, and the installation efficiency is low.

[0005] When using a forklift to lift the parts for installation, 3-4 people are needed to lift the parts to be installed at a height of 3-6 meters with a forklift, and the labor cost is high; during the lifting process of the parts to be installed, the parts to be installed must be balanced, otherwise the parts to be installed cannot be lifted, and adjusting the balance is time-consuming and labor-intensive; the hanger on the parts to be installed can only be moved and adjusted manually after leaving the forklift platform, which is labor-intensive and time-consuming. It takes about 2 hours to install a 6-meter pipe, and the installation efficiency is low; the body of the vehicle is heavy and the lifting height is limited.

[0006] When using a manual hoist to lift the parts for installation, 4-6 people are needed to transfer the parts to be installed at a height of 3-6 meters. The labor cost is high; it takes a long time. It takes about 4 hours to install a 6-meter pipe, and the installation efficiency is low.

[0007] In summary: the installation equipment currently used for indoor parts that need to be lifted and installed has the problems of low safety, low installation efficiency, high labor intensity and high labor costs. Utility Model Content

[0008] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a small indoor crane which improves hoisting safety, improves installation efficiency, reduces workers' labor intensity and reduces labor costs.

[0009] The technical solution of the utility model is as follows: an indoor small crane, comprising a mobile trolley, a mounting frame fixed on the mobile trolley, and a lifting mechanism arranged on the mounting frame, wherein: the lifting mechanism comprises a telescopic mast, a large arm base fixed to the bottom end of the telescopic mast as a whole, and the large arm base is connected to the mounting frame through a rotating shaft;

[0010] The telescopic mast comprises a main arm and a small arm located in the inner cavity of the main arm;

[0011] The bottom end of the forearm is provided with a forearm fixed pulley block a integrated therewith, the top of the forearm is provided with a suspension rope fixed pulley block and two forearm traction rope lifting ears, a forearm fixed pulley block b is provided at the rear position of the mounting frame, and the two forearm traction rope lifting ears are respectively provided with a forearm fixed pulley block c and a forearm fixed pulley block d;

[0012] The top of the boom is provided with two boom traction rope lifting ears and directional pulley block a and directional pulley block b integrated therewith, the two boom traction rope lifting ears are respectively provided with boom fixed pulley block a and boom fixed pulley block b, a boom fixed pulley block d integrated therewith is provided on the upper side plate of the outer wall of the boom, a boom fixed pulley block c is provided at the rear position of the mounting frame, and one end of the boom traction rope is fixed to the fixed pulley I in the boom fixed pulley block c on the mounting frame;

[0013] One end of the jib traction rope is fixed to a fixed pulley in the jib fixed pulley block b at the rear position of the mounting frame, and the other end of the jib traction rope is successively passed through the directional pulley block b, the jib fixed pulley block a, the directional pulley block a and another fixed pulley in the jib fixed pulley block b and fixed to the winch disc of the jib winch as a whole, and the jib winch is fixed to the mounting frame;

[0014] The other end of the boom traction rope is successively passed over the jib fixed pulley block c, the fixed pulley II in the boom fixed pulley block c, the boom fixed pulley block a, the fixed pulley III in the boom fixed pulley block c, the boom fixed pulley block d, the fixed pulley IV in the boom fixed pulley block c, the boom fixed pulley block b, the fixed pulley V in the boom fixed pulley block c, the jib fixed pulley block d and the fixed pulley VI in the boom fixed pulley block c, and then fixed to the winch disc of the boom winch, and the boom winch is fixed on the mounting frame;

[0015] The mounting frame is fixed with a suspension rope fixed pulley block a and a suspension rope hoist, the hoisting disc of the suspension rope hoist is fixed as a whole with one end of the suspension rope, and the other end of the suspension rope is fixed with a suspension fixture after passing through the suspension rope fixed pulley block a and the suspension rope fixed pulley block;

[0016] The boom winch, jib winch and rope winch are all electrically connected to a control cabinet with a PLC controller through wires, and the control cabinet is provided with control buttons for controlling forward or reverse rotation of the boom winch, jib winch and rope winch.

[0017] In order to facilitate the controllable running track of the mobile car, in the above scheme, further, the mobile car includes a driving motor, a transmission connected to the driving motor, a transmission device connected to the transmission, a running wheel driven to rotate by the transmission device, a gear lever and a clutch lever connected to the transmission, a brake pedal connected to the brake disc on the running wheel; a steering wheel connected to the reversing shaft of the transmission device;

[0018] The steering wheel, brake pedal, gear lever and clutch lever are all arranged at the rear of the mounting frame;

[0019] The drive motor is electrically connected to the control cabinet.

[0020] In order to ensure the safety of the entire lifting mechanism when not in use, in the above solution, further, a telescopic mast support frame is provided on the mounting frame, and the telescopic mast support frame is located at the front position of the mounting frame.

[0021] In order to ensure low energy consumption during the entire small crane lifting process, in the above scheme, further, a frequency converter is arranged between the control cabinet and the drive motor, and the frequency converter is electrically connected to the control cabinet and the drive motor respectively.

[0022] In order to facilitate the installation stability and operation stability of the boom traction rope lifting eye, directional pulley group a and directional pulley group b, in the above scheme, further, a reinforcement plate a integrated with the top of the boom is fixed, and the boom traction rope lifting eye, directional pulley group a and directional pulley group b are fixed on the reinforcement plate a.

[0023] To facilitate the telescopic properties of the forearm, in the above scheme, further, a guide pulley block is provided between the upper arm or the reinforcement plate a and the forearm.

[0024] In order to facilitate the installation stability and operation stability of the fixed pulley block of the suspension rope and the lifting eye of the traction rope of the forearm, in the above scheme, further, a reinforcement plate b is fixed to the top of the forearm, and the fixed pulley block of the suspension rope and the lifting eye of the traction rope of the forearm are fixed on the reinforcement plate a.

[0025] Due to the structure of the utility model, the weight of the vehicle body is greater than the sum of the weight of the hoisted object and the weight of the telescopic mast. Through the combination of the hoisting rope, the upper arm traction rope and the lower arm traction rope, the indoor installation work of the hoisting is satisfied. Even if the parts to be installed are unbalanced and randomly adjusted to cause shaking during the loading and unloading and hoisting process, it will not affect the operation of the workers, and the stability of the vehicle body and the reliability of hoisting are effectively guaranteed. During the installation process, the people on the elevated frame and the parts to be installed are not on the same elevated plane, which ensures the personal safety of the operator. Only 2-3 people are needed for the installation of the hanging pipe, and the installation speed is faster than the traditional installation method. Taking a 6-meter pipe as an example, the hoisting time is about 60 minutes, which greatly improves safety and work efficiency. It is also possible to walk during the hoisting operation, and the height of the telescopic arm is adjustable. That is, this solution improves the hoisting safety, improves the installation efficiency, reduces the labor intensity of workers and reduces the labor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The contents expressed in the drawings of the specification and the symbols in the drawings are briefly explained:

[0027] Figure 1 This is a schematic diagram of the structure of the utility model when a traction rope of a large arm is installed and viewed from above;

[0028] Figure 2 This is a schematic diagram of the structure of the utility model when the traction rope of the forearm is installed in the top view;

[0029] Figure 3 This is a schematic diagram of the structure of the utility model when viewed from above without installing the traction rope of the forearm, the suspension rope and the traction rope of the upper arm;

[0030] Figure 4 It is a schematic diagram of the structure of the telescopic mast of the utility model when it is at different angles during hoisting;

[0031] Figure 5 It is a structural schematic diagram of the utility model at the base of the big arm;

[0032] Figure 6 It is a structural schematic diagram of the telescopic mast of the utility model;

[0033] Figure 7 It is a schematic diagram of the structure of the top of the big arm of the utility model;

[0034] Figure 8 It is a schematic diagram of the structure of the top of the small arm of the utility model;

[0035] Fig. 9 It is a schematic diagram of the structure of the bottom of the small arm of the utility model;

[0036] In the figure: 1. mobile trolley; 2. mounting frame; 3. lifting mechanism; 4. telescopic mast; 5. boom base; 6. rotating shaft; 7. boom; 8. arm; 9. arm fixed pulley block a; 10. fixed pulley block for lifting rope; 11. lifting lug for traction rope of arm; 12. fixed pulley block b for arm; 13. traction rope of arm; 14. winch for arm; 15. lifting lug for traction rope of boom; 16. fixed pulley block c for arm; 17. traction rope of boom; 18. winch for boom; 19. lifting rope winch; 20. lifting rope; 21. hanging fixture; 22. control cabinet; 23. control button; 24. driving motor; 25. transmission; 26. Transmission device; 27. Traveling wheel; 28. Gear lever; 29. ​​Clutch lever; 30. Brake pedal; 31. Telescopic mast support frame; 32. Frequency converter; 33. Steering wheel; 34. Lighting lamp; 35. Boom fixed pulley block a; 36. Boom fixed pulley block b; 37. Forearm fixed pulley block c; 38. Forearm fixed pulley block d; 39. Boom fixed pulley block d; 40. Rope fixed pulley block a; 41. Reversing fixed pulley block II; 42. Reversing fixed pulley block III; 43. Reinforcement plate a; 44. Directional pulley block; 45. Reinforcement plate b; 46. Directional pulley block a; 47. Directional pulley block b. DETAILED DESCRIPTION

[0037] The present invention is further described in a non-limiting embodiment with reference to the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concept of the present invention.

[0038] like Figures 1 to 9 As shown, an indoor small crane comprises a mobile trolley 1, a mounting frame 2 fixed on the mobile trolley 1, and a lifting mechanism 3 arranged on the mounting frame 2, wherein: the lifting mechanism 3 comprises a telescopic mast 4, a large arm base 5 fixed to the bottom end of the telescopic mast 4 as a whole, and the large arm base 5 is connected to the mounting frame 2 through a rotating shaft 6;

[0039] The telescopic mast 4 comprises a large arm 7 and a small arm 8 located in the inner cavity of the large arm 7;

[0040] The bottom end of the forearm 8 is provided with a forearm fixed pulley block a9 integrated therewith, the top of the forearm 8 is provided with a suspension rope fixed pulley block 10 and two forearm traction rope lifting ears 11, and a forearm fixed pulley block b12 is provided at the rear position of the mounting frame 2, and the two forearm traction rope lifting ears 11 are respectively provided with a forearm fixed pulley block c37 and a forearm fixed pulley block d38;

[0041] The top of the boom 7 is provided with two boom traction rope lifting ears 15 and a directional pulley group a46 and a directional pulley group b47 integrated therewith, and the two boom traction rope lifting ears 15 are respectively provided with a boom fixed pulley group a35 and a boom fixed pulley group b36, and the upper side plate of the outer wall of the boom 7 is provided with a boom fixed pulley group d39 integrated therewith, and a boom fixed pulley group c16 is provided at the rear position of the mounting frame 2, and one end of the boom traction rope 17 is fixed to the fixed pulley I in the boom fixed pulley group c16 on the mounting frame 2;

[0042] One end of the jib traction rope 13 is fixed to a fixed pulley in the jib fixed pulley block b12 at the rear position of the mounting frame 2, and the other end of the jib traction rope 13 is successively passed through the directional pulley block b47, the jib fixed pulley block a9, the directional pulley block a46 and another fixed pulley in the jib fixed pulley block b12 and then fixed to the winch disc of the jib winch 14 as a whole, and the jib winch 14 is fixed to the mounting frame 2;

[0043] The other end of the boom traction rope 17 is successively passed through the jib fixed pulley block c37, the fixed pulley II in the boom fixed pulley block c16, the boom fixed pulley block a35, the fixed pulley III in the boom fixed pulley block c16, the boom fixed pulley block d39, the fixed pulley IV in the boom fixed pulley block c16, the boom fixed pulley block b36, the fixed pulley V in the boom fixed pulley block c16, the jib fixed pulley block d38 and the fixed pulley VI in the boom fixed pulley block c16, and then fixed to the winch disc of the boom hoist 18, and the boom hoist 18 is fixed to the mounting frame 2;

[0044] The mounting frame 2 is fixed with a suspension rope fixed pulley block a40 and a suspension rope hoist 19, the hoisting disc of the suspension rope hoist 19 is fixed as one body with one end of the suspension rope 20, and the other end of the suspension rope 20 is fixed with a suspension fixture 21 after passing through the suspension rope fixed pulley block a40 and the suspension rope fixed pulley block 10;

[0045] The boom winch 18, arm winch 14 and rope winch 19 are all electrically connected to a control cabinet 22 with a PLC controller through wires. The control cabinet 22 is provided with a control button 23 for controlling the forward or reverse rotation of the boom winch 18, arm winch 14 and rope winch 19. In this embodiment, the boom winch 18, arm winch 14 and rope winch 19 are controlled by the control button 23 to rotate forward or reverse, so that the parts to be installed in the hanging fixture 21 are lifted and lowered to the desired position as a whole. In cooperation with 2-3 workers, the parts to be installed can be quickly hoisted. In this embodiment, the fixed pulley in the boom fixed pulley group c16 is shown in the attached Figure 1 From top to bottom, they are fixed pulley I, fixed pulley II, fixed pulley III, fixed pulley IV, fixed pulley V and fixed pulley VI.

[0046] To ensure the stability of the hoisting, in the above embodiment, preferably: a reversing fixed pulley group I is provided between the boom hoist 18 and the boom fixed pulley group c16, a reversing fixed pulley group II 41 is provided between the jib hoist 14 and the jib fixed pulley group b12, and a reversing fixed pulley group III 42 is provided between the rope hoist 19 and the rope fixed pulley group 10;

[0047] The reversing fixed pulley set I, the reversing fixed pulley set II 41 and the reversing fixed pulley set III 42 are all fixed on the mounting frame 2. The reversing fixed pulley set I is not shown in the drawings.

[0048] In order to facilitate the controllable running track of the mobile car 1, in the above embodiment, preferably: the mobile car 1 includes a driving motor 24, a transmission 25 connected to the driving motor 24, a transmission device 26 connected to the transmission 25, a running wheel 27 driven to rotate by the transmission device 26, a gear lever 28 and a clutch lever 29 connected to the transmission 25, a brake pedal 30 connected to the brake disc on the running wheel 27; a steering wheel 33 connected to the reversing shaft of the transmission device 26;

[0049] The steering wheel 33, the gear lever 28 and the clutch lever 29 are all arranged at the rear position of the mounting frame 2;

[0050] The driving motor 24 is electrically connected to the control cabinet 22. In this embodiment, an illuminating lamp 34 is provided on the mounting frame 2.

[0051] To ensure the safety of the entire lifting mechanism 3 when not in use, in the above embodiment, preferably: a telescopic mast support frame 31 is provided on the mounting frame 2, and the telescopic mast support frame 31 is located at the front position of the mounting frame 2.

[0052] In order to ensure low energy consumption during the entire small crane lifting process, in the above embodiment, preferably: a frequency converter 32 is provided between the control cabinet 22 and the drive motor 24, and the frequency converter 32 is electrically connected to the control cabinet 22 and the drive motor 24 respectively.

[0053] In order to facilitate the installation stability and operation stability of the boom traction rope lifting eye 15, directional pulley group a46 and directional pulley group b47, in the above embodiment, preferably: the top of the boom 7 is fixed with a reinforcement plate a43 integrated therewith, and the boom traction rope lifting eye 15, directional pulley group a46 and directional pulley group b47 are fixed on the reinforcement plate a43.

[0054] To facilitate the telescopic properties of the forearm 8, in the above embodiment, preferably: a guide pulley set 44 is provided between the upper arm 7 or the reinforcement plate a43 and the forearm 8.

[0055] In order to facilitate the installation stability and operation stability of the fixed pulley block 10 of the lifting rope and the lifting ear 11 of the traction rope of the forearm, in the above embodiment, preferably: a reinforcement plate b45 is fixed to the top of the forearm 8, and the fixed pulley block 10 of the lifting rope and the lifting ear 11 of the traction rope of the forearm are fixed on the reinforcement plate a43.

[0056] All components in the above embodiments are commercially available products.

[0057] In the description of the present utility model, it should be understood that if the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, if the terms "first", "second", etc. appear, they are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

Claims

1. An indoor small crane, comprising a moving trolley (1), a mounting frame (2) fixed on the moving trolley (1), and a lifting mechanism (3) arranged on the mounting frame (2), characterized in that: The lifting mechanism (3) comprises a telescopic mast (4), a large arm base (5) fixed to the bottom end of the telescopic mast (4) as a whole, and the large arm base (5) is connected to the mounting frame (2) via a rotating shaft (6); The telescopic mast (4) comprises a large arm (7) and a small arm (8) located in the inner cavity of the large arm (7); The bottom end of the forearm (8) is provided with a forearm fixed pulley block a (9) integral therewith, the top end of the forearm (8) is provided with a suspension rope fixed pulley block (10) and two forearm traction rope lifting ears (11), a forearm fixed pulley block b (12) is provided at the rear position of the mounting frame (2), and the two forearm traction rope lifting ears (11) are respectively provided with a forearm fixed pulley block c (37) and a forearm fixed pulley block d (38); The top of the boom (7) is provided with two boom traction rope lifting ears (15) and a directional pulley group a (46) and a directional pulley group b (47) which are integrated therewith, and the two boom traction rope lifting ears (15) are respectively provided with a boom fixed pulley group a (35) and a boom fixed pulley group b (36), and an upper side plate of the outer wall of the boom (7) is provided with a boom fixed pulley group d (39) which is integrated therewith, and a boom fixed pulley group c (16) is provided at the rear position of the mounting frame (2), and one end of the boom traction rope (17) is fixed to a fixed pulley I in the boom fixed pulley group c (16) on the mounting frame (2); One end of the jib traction rope (13) is fixed to a fixed pulley in the jib fixed pulley block b (12) at the rear position of the mounting frame (2), and the other end of the jib traction rope (13) is successively passed through the directional pulley block b (47), the jib fixed pulley block a (9), the directional pulley block a (46) and another fixed pulley in the jib fixed pulley block b (12) and then fixed to the hoisting disc of the jib winch (14) as a whole, and the jib winch (14) is fixed to the mounting frame (2); The other end of the boom traction rope (17) is successively passed through a jib fixed pulley block c (37), a fixed pulley II in a boom fixed pulley block c (16), a boom fixed pulley block a (35), a fixed pulley III in a boom fixed pulley block c (16), a boom fixed pulley block d (39), a fixed pulley IV in a boom fixed pulley block c (16), a boom fixed pulley block b (36), a fixed pulley V in a boom fixed pulley block c (16), a jib fixed pulley block d (38) and a fixed pulley VI in a boom fixed pulley block c (16), and then fixed to a winch disc of a boom winch (18), wherein the boom winch (18) is fixed to a mounting frame (2); A suspension rope fixed pulley block a (40) and a suspension rope hoist (19) are fixed on the mounting frame (2); a hoisting disc of the suspension rope hoist (19) is fixed integrally with one end of a suspension rope (20); and a suspension fixture (21) is fixed to the other end of the suspension rope (20) after passing through the suspension rope fixed pulley block a (40) and the suspension rope fixed pulley block (10); The boom winch (18), the jib winch (14) and the rope winch (19) are all electrically connected to a control cabinet (22) having a PLC controller via wires, and the control cabinet (22) is provided with a control button (23) for controlling the forward or reverse rotation of the boom winch (18), the jib winch (14) and the rope winch (19).

2. The indoor small crane according to claim 1, characterized in that: A reversing fixed pulley block I is arranged between the boom winch (18) and the boom fixed pulley block c (16), a reversing fixed pulley block II (41) is arranged between the jib winch (14) and the jib fixed pulley block b (12), and a reversing fixed pulley block III (42) is arranged between the suspension rope winch (19) and the suspension rope fixed pulley block (10); The reversing fixed pulley block I, the reversing fixed pulley block II and the reversing fixed pulley block III are all fixed on the mounting frame (2).

3. The indoor small crane according to claim 1, characterized in that: The mobile vehicle (1) comprises a driving motor (24), a transmission (25) connected to the driving motor (24), a transmission device (26) connected to the transmission (25), a running wheel (27) driven to rotate by the transmission device (26), a gear lever (28) and a clutch lever (29) connected to the transmission (25), a brake pedal (30) connected to a brake disc on the running wheel (27); and a steering wheel (33) connected to a reversing shaft of the transmission device (26). The steering wheel (33), brake pedal (30), gear lever (28) and clutch lever (29) are all arranged at the rear of the mounting frame (2); The drive motor (24) is electrically connected to the control cabinet (22).

4. The indoor small crane according to any one of claims 1 to 3, characterized in that: A telescopic mast support frame (31) is provided on the mounting frame (2), and the telescopic mast support frame (31) is located at the front of the mounting frame (2).

5. The indoor small crane according to any one of claims 1 to 3, characterized in that: A frequency converter (32) is provided between the control cabinet (22) and the drive motor (24), and the frequency converter (32) is electrically connected to the control cabinet (22) and the drive motor (24) respectively.

6. The indoor small crane according to claim 1, characterized in that: A reinforcing plate a (43) integral with the upper end of the upper arm (7) is fixed, and the upper arm traction rope lifting lug (15), directional pulley block a (46) and directional pulley block b (47) are fixed on the reinforcing plate a (43).

7. The indoor small crane according to claim 1 or 6, characterized in that: A guide pulley group (44) is arranged between the upper arm (7) or the reinforcement plate a (43) and the lower arm (8).

8. The indoor small crane according to claim 1, characterized in that: A reinforcement plate b (45) is fixed to the top of the forearm (8), and the suspension rope fixed pulley block (10) and the forearm traction rope lifting lug (11) are fixed on the reinforcement plate a (43).

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