Lifting devices and cranes

Abstract

The present invention provides a lifting device and a crane, wherein the lifting device comprises a connecting part, a bearing part, and a transmission part. The connecting part is used to connect with a counterweight bracket of the crane; the bearing part is used to bear a worker; the transmission part is used to control the bearing part to rise to a first target position so as to be close to a climbing starting point of the counterweight bracket; and the transmission part is also used to control the bearing part to descend to a second target position so as to be close to the ground or in contact with the ground. Through the lifting device, the worker can easily reach above the crane arm; and, without being affected by the site and the shape of the crane itself, the worker can quickly return to the ground, thereby reducing the climbing intensity.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to a lifting device and a crane provided with the lifting device. Background Art

[0002] The side of the crane frame is generally provided with a passage for workers to climb to the top of the boom. However, with the increase in lifting tonnage and the size of the boom, the sides of many crane turntables, especially the upper sides of the frames of super-large tonnage cranes, are easily blocked by the boom, and there is not enough space for workers (such as operators) to go up and down. Especially for cranes with super lifting, they are in the shape of an inverted triangle that is wide at the top and narrow at the bottom, and workers cannot go up and down from the side of the frame. If an additional independent ladder is configured, workers will need to climb the ladder, which consumes a lot of physical strength and has a poor experience. In addition, a special transfer vehicle is required to transport the ladder. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a lifting device and a crane provided with the lifting device, through which a worker can easily reach the crane arm and quickly return to the ground.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A lifting device, comprising:

[0006] A connecting portion, used for connecting to a counterweight bracket of a crane;

[0007] A carrying part, used for carrying staff;

[0008] The transmission part is used to control the bearing part to rise to a first target position so as to be close to the climbing starting point of the counterweight bracket; and to control the bearing part to descend to a second target position so as to be close to the ground or in contact with the ground.

[0009] Optionally, in the above lifting device, the transmission part includes a base and a telescopic mechanism, wherein:

[0010] The bearing portion is disposed on the base;

[0011] The two ends of the telescopic mechanism are respectively connected to the connecting part and the base, and are used to control the base to rise so that the bearing part approaches or reaches the height of the tray of the counterweight bracket, and to control the base to descend so that the bearing part approaches the ground or contacts the ground.

[0012] Optionally, in the above-mentioned lifting device, the telescopic mechanism includes a scissors strut and a power element for driving the scissors strut to extend and retract.

[0013] Optionally, in the above lifting device, it also includes:

[0014] A locking member for keeping the telescopic mechanism in a retracted state;

[0015] And / or, an elastic mechanism for automatically contracting the telescopic mechanism.

[0016] Optionally, in the above lifting device, the connecting portion is fixedly connected to the bottom of the tray of the counterweight bracket;

[0017] Alternatively, the connection portion is fixedly connected to a side surface of a tray of the counterweight bracket.

[0018] Optionally, in the above-mentioned lifting device, the transmission part further includes a secondary lifting mechanism for driving the bearing part to vertically lift and lower relative to the base.

[0019] Optionally, in the above lifting device, the secondary lifting mechanism includes:

[0020] A first rod body, vertically fixed to the base, and the bearing part can be vertically lifted and lowered along the first rod body;

[0021] The second rod body is telescopically sleeved in the first rod body and driven to rise and fall by the driving device;

[0022] a pulley rotatably disposed on the second rod body;

[0023] A flexible member has one end connected to the first rod body and the other end connected to the bearing portion after passing around the pulley.

[0024] Optionally, in the above lifting device, a connecting ear is provided on a side surface of the bearing portion, and the connecting ear is provided with a limiting hole sleeved outside the first rod body.

[0025] A crane is provided with a counterweight bracket for supporting a counterweight block, characterized in that the counterweight bracket is provided with the lifting device described above.

[0026] Optionally, in the above crane, the counterweight bracket comprises:

[0027] A tray is fixedly connected to the connecting portion of the lifting device;

[0028] A hanging rack is arranged above the tray and is provided with a ladder;

[0029] The hanging lug is arranged on the side of the hanging bracket and is used for connecting with the crane frame.

[0030] When the lifting device is installed on the counterweight bracket of the crane, the transmission part and the bearing part in the lifting device can easily send the staff to the counterweight bracket, and then reach the position of the boom, and also can easily return the staff from the crane to the ground. The above process is not affected by the width of the boom. Therefore, the lifting device can be applied not only to ordinary cranes, but also to super-large tonnage cranes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a schematic diagram of the unfolded structure of the scissors support in the lifting device provided in the first specific embodiment of the present invention;

[0033] Figure 2 It is a schematic diagram of the contraction structure of the scissors support in the lifting device provided in the first specific embodiment of the present invention;

[0034] Figure 3 It is a front view of the installation structure of the lifting device provided in the first specific embodiment of the present invention on the counterweight bracket;

[0035] Figure 4 A top view of the installation structure of the lifting device on the counterweight bracket provided in the first specific embodiment of the present invention;

[0036] Figure 5 It is a left view of the installation structure of the lifting device provided in the first specific embodiment of the present invention on the counterweight bracket;

[0037] Figure 6 and Figure 7 It is an axonometric diagram of the installation structure of the lifting device on the counterweight bracket provided in the first specific embodiment of the present invention at different angles;

[0038] Figure 8 It is a front view of the installation structure of the lifting device provided in the second specific embodiment of the present invention on the counterweight bracket;

[0039] Fig. 9 A top view of the installation structure of the lifting device on the counterweight bracket provided in the second specific embodiment of the present invention;

[0040] Fig.10 It is a left view of the installation structure of the lifting device on the counterweight bracket provided in the second specific embodiment of the present invention;

[0041] Fig.11 and Fig.12 It is an axonometric view of the installation structure of the lifting device on the counterweight bracket provided in the second specific embodiment of the present invention at different angles.

[0042] in:

[0043] 101-connecting part, 102-base, 103-telescopic mechanism, 104-power element,

[0044] 105-locking member, 106-elastic mechanism,

[0045] 201-bearing part, 202-transition plane, 203-ladder,

[0046] 301-Secondary lifting mechanism,

[0047] 311-first rod body, 312-second rod body, 313-flexible member, 314-pulley,

[0048] 401-Counterweight bracket,

[0049] 411-tray, 412-hanging rack, 413-hanging ear. DETAILED DESCRIPTION

[0050] The invention discloses a lifting device and a crane provided with the lifting device. Through the lifting device, a worker can conveniently reach the crane arm and can also conveniently return to the ground quickly.

[0051] 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.

[0052] See also Figures 1 to 12 The lifting device provided by the embodiment of the present invention includes a connecting part 101, a bearing part 201, and a transmission part. The connecting part 101 is used to connect with the counterweight bracket 401 of the crane; the bearing part 201 is used to carry the staff; the transmission part is used to control the bearing part 201 to rise to the first target position, close to the climbing starting point of the counterweight bracket 401; and the transmission part is also used to control the bearing part 201 to descend to the second target position, close to the ground or in contact with the ground.

[0053] It should be noted that the counterweight bracket 401 generally includes a tray 411, a hanger 412 and a hanger 413. The above-mentioned "climbing starting point" specifically refers to:

[0054] When the height of the hanger 412 is relatively low, the worker can easily climb the hanger 412 and then reach the crane arm, which means that the worker only needs to be sent to the tray 411 through the lifting device. At this time, the above-mentioned "climbing starting point" is the position where the tray 411 is located;

[0055] When the height of the rack 412 is high and it is difficult for the staff to climb over the rack 412 by themselves, the staff needs to be directly sent to the rack 412 by a lifting device. At this time, the above-mentioned “climbing starting point” is the top position of the rack 412.

[0056] It can be seen that when the lifting device is installed on the counterweight bracket 401 of the crane, the transmission part and the bearing part 201 in the lifting device can easily send the staff to the counterweight bracket 401, and then reach the position of the boom, and it is also convenient for the staff to return to the ground from the crane. The above process is not affected by the width of the boom. Therefore, the lifting device can be applied not only to ordinary cranes, but also to super-large tonnage cranes.

[0057] See also Figure 3 and Figure 5 In a specific implementation, the connection part 101 in the lifting device can be its top frame, that is, the lifting device is fixedly connected to the counterweight bracket 401 of the crane through its own top frame. Figures 3 to 7 The lifting device can be fixedly mounted on the rear side of the crane counterweight bracket 401 through its top frame; or, see Figures 8 to 12 , the lifting device can be fixedly installed below the counterweight bracket 401 of the crane through its top frame. However, it is not limited to this. In other specific embodiments, the connecting part 101 in the lifting device can also be a plate-mounted structure, or a support structure directly fixedly connected to the bottom of the counterweight bracket 401. Moreover, in the specific implementation, the connection between the top frame and the counterweight bracket 401 can be a welding connection, or it can be a locking connection through bolts, nuts or other connecting accessories. Therefore, the present application does not specifically limit the specific structural form of the connecting part 101 and its specific connection structure with the counterweight bracket 401, and the technical personnel can make specific designs according to actual needs.

[0058] Moreover, in specific implementation, there are many ways to implement the bearing part 201 in the lifting device, for example, it can be made into Figure 6 The hanging basket structure with handrails, fences and pedals shown in the figure, or in other specific embodiments, it can also be made into a load-bearing structure with only handrails and pedals, or other structures that can facilitate the staff to take. The present invention does not make specific limitations on its specific structural design, as long as it can achieve the purpose of carrying the staff to lift.

[0059] For specific implementation, see Figure 1 and Figure 2 The transmission part of the lifting device includes a base 102 and a telescopic mechanism 103.

[0060] The bearing portion 201 is fixedly connected to the base 102;

[0061] The two ends of the telescopic mechanism 103 are respectively connected to the connecting part 101 and the base 102, and are used to control the base 102 to rise so that the bearing part 201 is close to or reaches the height of the tray 411 of the counterweight bracket 401, and to control the base 102 to descend so that the bearing part 201 is close to the ground or in contact with the ground.

[0062] When the staff needs to climb to the vicinity of the crane arm, the telescopic mechanism 103 extends to allow the base 102 to descend with the load-bearing portion 201 to a position in contact with the ground, or to a position close to the ground, so that the staff can board the load-bearing portion 201; then, the telescopic mechanism 103 retracts to allow the base 102 to rise to the vicinity of the counterweight bracket 401, that is, the load-bearing portion 201 approaches or reaches the height of the counterweight bracket 401. At this time, the staff can transfer from the load-bearing portion 201 to the counterweight bracket 401, and then reach the vicinity of the crane arm.

[0063] When the staff needs to get off the crane, they first wait on the counterweight bracket 401. If the base 102 stops near the counterweight bracket 401, they go to the bearing part 201 and then control the base 102 to descend to a position in contact with the ground, or to a position close to the ground, so as to facilitate the staff to land.

[0064] Specifically, the telescopic mechanism 103 preferably adopts a scissors brace, and a power element 104 (such as a hydraulic cylinder) for driving the scissors brace to extend and retract. Furthermore, the lifting device is also provided with: a locking member 105 for keeping the telescopic mechanism 103 in a retracted state; and / or an elastic mechanism 106 (such as a tension spring) for automatically retracting the telescopic mechanism 103. When the power element 104 drives the telescopic mechanism 103 to extend to control the base 102 with the bearing part 201 to descend close to the ground, the elastic mechanism 106 is stretched; when the power element 104 drives the telescopic mechanism 103 to contract to control the base 102 with the bearing part 201 to rise, the elastic mechanism 106 contracts under the action of its own restoring force, at this time, the telescopic mechanism 103 can be automatically kept in a retracted state through the elastic mechanism 106, and the telescopic mechanism 103 can be locked in a retracted state through the locking member 105 to prevent its accidental expansion from affecting the normal travel of the jack. However, it is not limited to this. In other specific embodiments, other devices that can control the lifting and lowering of the load-bearing part 201 can also be used to replace the telescopic mechanism 103, such as a hydraulic cylinder, a winch mechanism, etc., as long as it can achieve manned lifting and convenient storage without affecting the normal operation of the crane.

[0065] In a specific implementation, the connecting portion 101 can be fixedly connected to the side of the tray 411 of the counterweight bracket 401, such as Figure 6 The connecting portion 101 may also be fixedly connected to the bottom of the tray 411 of the counterweight bracket 401, as shown in FIG. Fig.10 and Fig.11 As shown in . As long as the bearing part 201 is always outside the counterweight bracket 401 and does not affect the workers getting on and off. Generally, the connecting part 101 can be fixedly connected to the crane counterweight bracket 402 by fastener assembly. However, it is not limited to this. In other specific embodiments, the fixed connection between the two can also be achieved by welding.

[0066] In summary, the first specific embodiment of the present invention further provides a crane, which is provided with a counterweight bracket 401 for supporting a counterweight block, and the above-mentioned lifting device is provided on a side of the counterweight bracket 401 away from the boom.

[0067] Specifically, the counterweight bracket 401 includes a tray 411, a hanger 412, and a lug 413. Among them: the connecting portion 101 in the lifting device is fixedly connected to the tray 411; the hanger 412 is arranged above the tray 411 and is provided with a ladder 203; the lug 413 is arranged on the side of the hanger 412 for connecting with the crane frame.

[0068] In specific implementation, the connection part 101 can be fixedly arranged below the tray 411, but the bearing part 201 should be located outside the tray 411, and the bearing part 201 is not interfered by the counterweight bracket 401 during the lifting process (similar to Fig. 9 Alternatively, the connection portion 101 may be fixedly connected to the side of the tray 411 away from the boom, and a transition plane 202 is also provided on the connection portion 101 to facilitate the staff to safely walk to the hanger 412, climb over the hanger 412 through the ladder 203, and then reach the location of the boom. For details, see Figure 6 and Figure 7 .

[0069] When the staff needs to climb onto the boom, they first reach the tray 411 through the lifting device, then climb to the hanger 412 through the ladder 203, and then reach the location of the boom.

[0070] Second specific embodiment

[0071] See also Figures 8 to 12The second specific embodiment of the present invention provides a lifting device and a crane equipped with the lifting device. The difference between the lifting device and the lifting device in the first specific embodiment is that in addition to the above-mentioned base 102 and telescopic mechanism 103, the transmission part of the lifting device also includes a secondary lifting mechanism 301 for driving the bearing part 201 to vertically lift and lower relative to the base 102.

[0072] Specifically, the secondary lifting mechanism 301 includes a first rod 311, a second rod 312, a pulley 314, and a flexible member 313 (such as a transmission chain or a wire rope), wherein:

[0073] The first rod 311 is vertically fixed to the base 102, and the bearing part 201 can be vertically lifted and lowered along the first rod 311;

[0074] The second rod body 312 is telescopically mounted inside the first rod body 311 and is driven to rise and fall by the driving device;

[0075] The pulley 314 is rotatably disposed on the second rod body 312;

[0076] One end of the flexible member 313 is connected to the first rod 311 , and the other end of the flexible member 313 is connected to the bearing portion 201 after passing through the pulley 314 .

[0077] When the second rod 312 rises vertically relative to the first rod 311, the end of the flexible member 313 connected to the first rod 311 is fixed, and the other end is lifted vertically with the carrying part 201. When the carrying part 201 rises to the vicinity of the top of the hanging bracket 412, the staff can easily reach the hanging bracket 412 and then reach the vicinity of the crane arm; when the carrying part 201 falls to the vicinity of the tray 411, the telescopic mechanism 103 mentioned above is continuously controlled to descend, and the staff can be sent back to the ground.

[0078] In specific implementation, a hydraulic cylinder can be used as a driving device to drive the second rod body 312 to rise and fall vertically, wherein: the cylinder body of the hydraulic cylinder is the first rod body 311, or is coaxially installed in the first rod body 311; the piston rod of the hydraulic cylinder is the second rod body 312, or is coaxially fixed to the second rod body 312.

[0079] Alternatively, in other specific embodiments, a screw mechanism and a motor can also be used as a driving device to drive the second rod body 312 to rise and fall vertically, wherein the screw in the screw mechanism is the first rod body 311, or is coaxially installed in the first rod body 311; the screw nut in the screw mechanism is fixedly connected to the second rod body 312; and the motor is used to drive the screw to rotate.

[0080] It can be seen that both of the above two specific embodiments can realize the vertical lifting of the second rod 312 relative to the first rod 311. However, it is not limited to this, and other driving methods may also be used in other specific embodiments to control the secondary lifting of the bearing part 201. The present invention does not make specific limitations on this.

[0081] For specific implementation, see Figure 8 and Fig.11 One or more connecting ears 211 are arranged on the side of the bearing part 201. Each connecting ear 21 is provided with a limiting hole for being sleeved outside the first rod body 311 to horizontally position the bearing part 201, thereby preventing the bearing part 201 from shaking at will, which is beneficial to ensuring the construction safety of the workers.

[0082] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0083] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0084] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An elevating device, characterized in that, it includes: a connecting part (101) connected to the counterweight bracket (401) of the crane; the connecting part (101) is fixedly connected to the bottom of the tray (411) of the counterweight bracket (401); or, the connecting part (101) is fixedly connected to the side of the tray (411) of the counterweight bracket (401) away from the boom; a bearing part (201) for bearing the staff; a transmission part for controlling the bearing part (201) to rise to a first target position to approach the climbing starting point of the counterweight bracket (401); and for controlling the bearing part (201) to descend to a second target position to approach the ground or contact the ground; the transmission part includes a base (102) and a telescopic mechanism (103), wherein: the bearing part (201) is located on the side of the base (102) away from the boom, and the base (102) is located below the connecting part (101); the upper end of the telescopic mechanism (103) is connected to the connecting part (101), and the lower end is connected to the base (102), for controlling the base (102) to rise to make the bearing part (201) approach or reach the height where the tray (411) of the counterweight bracket (401) is located, and for controlling the base (102) to descend to make the bearing part (201) approach the ground or contact the ground; it further includes a secondary elevating mechanism (301) for driving the bearing part (201) to vertically elevate relative to the base (102), capable of controlling the bearing part (201) to rise from near the tray (411) to near the top of the hanging bracket (412) of the counterweight bracket (401); the secondary elevating mechanism (301) includes: a first rod body (311) vertically and fixedly connected to the base (102), and the bearing part (201) can vertically elevate along the first rod body (311); a second rod body (312) telescopically sleeved in the first rod body (311) and driven to elevate by a driving device; a pulley (314) rotatably arranged on the second rod body (312); a flexible member (313) with one end connected to the first rod body (311) and the other end connected to the bearing part (201) after bypassing the pulley (314).

2. The elevating device according to claim 1, characterized in that, the telescopic mechanism (103) includes a scissors brace and a power element (104) for driving the scissors brace to expand and contract.

3. The elevating device according to claim 1, characterized in that, it further includes: a locking member (105) for keeping the telescopic mechanism (103) in a contracted state; and / or, an elastic mechanism (106) for automatically contracting the telescopic mechanism (103).

4. The elevating device according to claim 1, characterized in that, a connecting ear (211) is arranged on the side of the bearing part (201), and the connecting ear (211) is provided with a limiting hole sleeved outside the first rod body (311).

5. A crane, provided with a counterweight bracket (401) for supporting a counterweight block, It is characterized in that The counterweight bracket (401) is provided with a lifting device as described in any one of claims 1 to 4.

6. The crane according to claim 5, It is characterized in that The counterweight bracket (401) comprises: A tray (411) is fixedly connected to the connecting portion (101) in the lifting device; A hanging rack (412) is arranged above the tray (411) and is provided with a ladder (203); The hanging lug (413) is arranged on the side of the hanging bracket (412) and is used for connecting with the crane frame.

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