Lifting platform cable lifting device and control method

Abstract

The invention relates to a lifting platform cable lifting device and a control method, a lifting platform comprises a lifting tower and a platform, the lifting tower comprises n layers of tower frames which are in sliding fit in sequence, all the layers of tower frames except the first layer of tower frame are driven by a lifting oil cylinder to do lifting motion, and the platform is fixed to the nth layer of tower frame and used for installing signal receiving and transmitting equipment; the cable lifting device comprises m sections of drag chains arranged on the lifting tower, m is larger than or equal to 2, m * 2 + 1 is equal to n, the two ends of the xth section of drag chain are correspondingly fixed to the (x-1) * 2 + 1 layer and the xx2 + 1 layer of tower frame, x is larger than or equal to 1 and smaller than or equal to m, cables connected with signal receiving and transmitting equipment are sequentially arranged in the m sections of drag chains, and the cable lifting device has the advantages of being simple in structure, good in stability, high in safety, high in practicability and excellent in strong wind resistance. The method has the advantages of simplicity and convenience in control, safety and reliability.

Description

Technical Field

[0001] The invention relates to a lifting device, in particular to a cable lifting device for a lifting platform and a control method thereof. Background Art

[0002] In fields such as aerospace, it is often necessary to lift antennas and other signal transceiver equipment to a certain height through a lifting platform (lifting tower + platform) to meet the signal transceiver requirements. This requires that the various cables connecting the signal transceiver equipment be retracted and released along with the lifting and lowering action of the lifting platform. At present, this field mainly uses cable reels and pulleys on towers to retract and release cables. Not only is the force-bearing structure poor, but the control is also more complicated. The lifting speed needs to be synchronized with the cable reel reel speed. Once the coordination is wrong, it is easy to cause cable abnormalities and even cause equipment damage, which is less safe. In addition, the signal transceiver equipment needs to be lifted to a sufficient height and is greatly affected by wind loads. The existing cable retraction method and structure can no longer meet the stability requirements. Summary of the invention

[0003] The purpose of the present invention is to provide a lifting platform cable lifting device and a control method. The device has the advantages of simple structure, low cost, good stability, high safety, strong practicality and excellent resistance to strong winds; the method has the advantages of easy operation, safety and reliability.

[0004] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a lifting platform cable lifting device, wherein the lifting platform comprises a lifting tower and a platform, the lifting tower comprises n-layer tower frames which slide in sequence, and the tower frames of the other layers except the first layer tower frame are driven by lifting cylinders to perform lifting and lowering movements, the platform is fixed on the n-th layer tower frame and is used to install signal transceiver equipment, the cable lifting device comprises m-segment drag chains arranged on the lifting tower, m≥2, m×2+1=n, the two ends of the x-th segment drag chain are correspondingly fixed on the (x-1)×2+1th layer and the x×2+1th layer tower frames, 1≤x≤m, and the cables connecting the signal transceiver equipment are arranged in sequence in the m-segment drag chains.

[0005] Furthermore, the present invention provides a lifting platform cable lifting device, wherein the n-layer tower frames of the lifting tower are arranged in sequence from the outside to the inside, the first-layer tower frame is at the outermost layer, and the n-th-layer tower frame is at the innermost layer.

[0006] Furthermore, the present invention provides a lifting platform cable lifting device, wherein both ends of the m-segment drag chains are respectively fixed to corresponding towers through adapter frames.

[0007] Furthermore, the present invention provides a lifting platform cable lifting device, wherein the m sections of drag chains are located on the same side of the lifting tower and are arranged layer by layer from outside to inside, the first section of the drag chain is located in the outermost layer, and the mth section of the drag chain is located in the innermost layer.

[0008] Furthermore, the present invention provides a lifting platform cable lifting device, wherein a plurality of U-shaped guard plates distributed at intervals are fixed on the first-layer tower frame of the lifting tower, and the m-segment drag chains are all located at the inner side of the plurality of U-shaped guard plates.

[0009] Furthermore, the present invention provides a lifting platform cable lifting device, wherein a drag chain box located inside a plurality of U-shaped guard plates is fixed on the first-layer tower frame of the lifting tower, and the m-segments of drag chains are all located in the drag chain box.

[0010] Furthermore, the present invention provides a lifting platform cable lifting device, wherein the lifting tower includes 7 layers of tower frames that are slidably matched in sequence, that is, n=7, and the cable lifting device includes 3 sections of drag chains arranged on the lifting tower, that is, m=3.

[0011] Furthermore, the present invention provides a lifting platform cable lifting device, wherein the drag chain is made of steel and / or aluminum, the outer width of the drag chain is 200 mm, the pitch of the drag chain is 45 mm, the section height of the drag chain is 30 mm, and the total length of the three sections of the drag chain is 40 m.

[0012] Furthermore, the present invention provides a lifting platform cable lifting device, wherein the lower half of the first-layer tower of the lifting tower is hinged on the vehicle chassis through an axial rotation, a vertical cylinder is hinged between the middle part of the first-layer tower and the vehicle chassis through a pin shaft, a horizontal locking hole is provided on one side of the upper end of the first-layer tower, and a vertical locking hole is provided at the lower end of the first-layer tower, and a horizontal locking cylinder and a vertical locking cylinder are respectively installed on the vehicle chassis, the piston rod of the horizontal locking cylinder is connected to a horizontal locking pin that cooperates with the horizontal locking hole, and the piston rod of the vertical locking cylinder is connected to a vertical locking pin that cooperates with the vertical locking hole.

[0013] Based on the same concept, the present invention also provides a control method for the above-mentioned lifting platform cable lifting device, comprising the following steps:

[0014] S1. When the lifting platform is in a lying state, the lying lock pin is driven out of the lying lock hole by the lying lock cylinder to unlock the lifting platform in the lying state;

[0015] S2, the lifting platform is driven to rotate around the axis by the vertical cylinder to flip it so that it is erected from a horizontal position to a vertical position. When the lifting platform is erected to a certain position, the vertical locking cylinder drives the vertical locking pin to be inserted into the vertical locking hole to lock the lifting platform in the vertical state;

[0016] S3. The tower frames and platforms on all floors of the lifting tower except the first floor are gradually raised by the lifting cylinder, and each section of the drag chain and cable moves with the rise of the corresponding tower frame;

[0017] S4. When the lifting tower and platform are raised to the correct position, the lifting cylinder stops moving and maintains the state;

[0018] S5. When the lifting platform is withdrawn, the tower frames and platforms on all floors of the lifting tower except the first floor are driven to gradually descend through the lifting cylinder, and each section of the drag chain and cable moves with the descent of the corresponding tower frame;

[0019] S6. When the lifting tower and platform are lowered to their proper positions, the lifting cylinder stops moving and remains in the same state;

[0020] S7, driving the vertical locking pin to be pulled out from the vertical locking hole by the vertical locking cylinder to unlock the lifting platform in the vertical state, and driving the lifting platform to rotate around the axis to flip it by the vertical lifting cylinder, so that it falls from the vertical position to the lying position;

[0021] S8. When the lifting platform is in the lying position, the vertical cylinder is stopped and the lying position locking cylinder drives the lying position locking pin to be inserted into the lying position locking hole to lock the lifting platform in the lying state.

[0022] Compared with the prior art, the present invention provides a lifting platform cable lifting device and control method, which have the following advantages: the lifting platform comprises a lifting tower and a platform, wherein the lifting tower comprises n-layer tower frames which are slidably matched in sequence, and the tower frames of the remaining layers except the first layer tower frame are driven by a lifting cylinder to perform lifting and lowering movements, and the platform is fixed on the n-layer tower frame and used to install a signal transceiver device. The present invention arranges m sections of drag chains on the lifting tower, and fixes the two ends of the x-th section of the drag chain on the (x-1)×2+1th layer and the x×2+1th layer tower frames (11) correspondingly, and arranges the cables connecting the signal transceiver devices in sequence in the m-section of the drag chains, wherein m≥2, m×2+1=n, and 1≤x≤m. Thus, a cable lifting device for a lifting platform is formed, which has a simple structure, low cost, good stability, high safety, strong practicality, and excellent strong wind resistance. During the lifting process, each section of the drag chain will automatically extend and retract as the lifting platform rises and falls. Since the cables are arranged in sequence in each section of the drag chain, the cables will move with each section of the drag chain, ensuring the stability and reliability of the cable connection. Compared with the existing cable reel + pulley on the tower, since each section of the drag chain and the cable moves closely with the movement of the lifting platform, there is no need to set up an additional speed adaptation mechanism, and the cable end plugging / unplugging process before the cable is retracted is eliminated. The sequential arrangement of the cables in the drag chain improves the stress condition of the cables during the lifting process, which not only simplifies the connection structure, but also reduces the control difficulty. The rigidity is increased by setting and fixing the drag chain in sections, reducing the impact of wind load on the drag chain and the cable, and improving stability and reliability.

[0023] The following is a further detailed description of a lifting platform cable lifting device of the present invention in conjunction with the specific embodiments shown in the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the lifting tower in the present invention;

[0025] Figure 2 It is a front view of a lifting platform cable lifting device of the present invention;

[0026] Figure 3 It is a right side view of a lifting platform cable lifting device of the present invention;

[0027] Figure 4 It is a schematic diagram of the arrangement of each section of the drag chain in the present invention;

[0028] Figure 5 Schematic diagram of the extension and retraction of the outer drag chain (first drag chain) of the present invention;

[0029] Figure 6 Schematic diagram of the extension and retraction method of the middle layer drag chain (second section drag chain) of the present invention;

[0030] Figure 7 Schematic diagram of the extension and retraction of the inner layer drag chain (the third section of the drag chain) in the present invention;

[0031] Figure 8 It is a front view of the combined state of the U-shaped guard plate and the drag chain box in the present invention;

[0032] Fig. 9 It is a left view of the combined state of the U-shaped guard plate and the drag chain box in the present invention;

[0033] Fig.10 It is an axonometric view of the drag chain box in the present invention;

[0034] Fig.11 This is a schematic diagram of the arrangement of cables in the present invention;

[0035] Fig.12 It is a schematic diagram of the movement mode of the cable in the present invention;

[0036] in, Figure 2 , Figure 3 , Fig.11 and Fig.12 The lifting platforms shown in the figure are simplified schematic diagrams. DETAILED DESCRIPTION

[0037] First of all, it should be explained that the directional words such as up, down, left, right, front and back described in the present invention are only described according to the drawings for the convenience of understanding, and are not intended to limit the technical solution and the scope of protection of the present invention.

[0038] like Figures 1 to 12The specific implementation of the cable lifting device of a lifting platform of the present invention is shown in the figure. The lifting platform specifically includes a lifting tower 1 and a platform 2, wherein the lifting tower 1 includes n-layer tower frames 11 that slide in sequence. Except for the first-layer tower frame 11, the other layers of tower frames 11 are driven by a lifting cylinder (not shown in the figure) to perform lifting and lowering movements. The platform 2 is fixed on the n-layer tower frame 11 and is used to install a signal transceiver device. M sections of drag chains 3 are arranged on the lifting tower 1, and the two ends of the x-th section of the drag chain 3 are correspondingly fixed on the (x-1)×2+1-th layer and the x×2+1-th layer of the tower frame 11, and the cables 4 connecting the signal transceiver device are arranged in sequence in the m-section of the drag chain 3, wherein m≥2, m×2+1=n, and 1≤x≤m.

[0039] The above arrangement constitutes a lifting platform cable lifting device with simple structure, low cost, good stability, high safety, strong practicality and excellent strong wind resistance. During the lifting process, each section of the drag chain 3 will automatically extend and retract as the lifting platform rises and falls. Since the cable 4 is arranged in sequence in each section of the drag chain 3, the cable 4 will move with each section of the drag chain 3, ensuring the stability and reliability of the connection of the cable 4. Compared with the existing cable reel + pulley on the tower, since each section of the drag chain 3 and the cable 4 moves closely following the movement of the lifting platform, there is no need to set up an additional speed adaptation mechanism, eliminating the cable end plugging / unplugging process before the cable is retracted. The sequential arrangement of the cables in the drag chain improves the stress condition of the cables during the lifting process, which not only simplifies the connection structure, but also reduces the control difficulty. The rigidity is increased by setting and fixing the drag chain 3 in sections, reducing the impact of wind load on the drag chain 3 and the cable 4, and improving stability and reliability. It should be noted that the lifting platform is an existing device in the field, and its structure, principle and lifting method are well known to technicians and will not be repeated here; the signal transceiver equipment in this article refers to equipment such as antennas and lightning protection devices. In practical applications, according to the height requirements of the signal transceiver equipment, the present invention usually designs the lifting platform as a 7-story tower 11, that is, n=7, and correspondingly, 3 sections of drag chains 3 are set, that is, m=3. However, it should be pointed out that the tower 11 of the lifting platform is not limited to 7 floors, and correspondingly, the drag chain 3 is not limited to 3 sections. According to specific actual needs, the tower 11 of the lifting platform can also be designed to have 5 floors or more than 7 floors, and correspondingly, the drag chain 3 can also be designed to have 2 sections or more than 3 sections, which can also achieve the technical purpose of the present invention.

[0040] As a specific embodiment, the present invention makes the n-layer tower frame 11 of the lifting tower 1 be arranged in sequence from the outside to the inside, wherein the first-layer tower frame 11 is at the outermost layer, and the n-layer tower frame 11 is at the innermost layer, so as to facilitate the structural layout and improve stability. To facilitate installation and connection, the present specific embodiment allows the two ends of the m-segment drag chain 3 to be fixed to the corresponding tower frame 11 through the adapter frame 31 respectively. At the same time, the present specific embodiment improves the compactness and stability of the structure by arranging the m-segment drag chain 3 on the same side of the lifting tower 1 and arranging them layer by layer from the outside to the inside, wherein the first-segment drag chain 3 is at the outermost layer, and the m-segment drag chain 3 is at the innermost layer. In order to enhance the structural stability and safety, the present embodiment fixes a plurality of U-shaped guard plates 5 distributed at intervals on the first-layer tower frame 11 of the lifting tower 1, and makes the m-segment drag chains 3 all located inside the plurality of U-shaped guard plates 5; further, the present embodiment also fixes a drag chain box 6 located inside the plurality of U-shaped guard plates 5 on the first-layer tower frame 11 of the lifting tower 1, and makes the m-segment drag chains 3 all located in the drag chain box 6, so as to enhance the protective effect of the drag chain 3. As a specific embodiment, the present invention makes the drag chain 3 made of steel or / and aluminum, and designs the outer width of the drag chain 3 to be 200mm, the pitch of the drag chain 3 to be 45mm, and the section height of the drag chain 3 to be 30mm, so as to ensure that its structural strength meets the use requirements. For the lifting tower 1 and the 3-segment drag chain 3 of the 7-layer tower frame 11, the present invention designs the total length of the 3-segment drag chain 3 to be 40m, so as to ensure that the lifting stroke meets the height requirements of the signal transceiver equipment.

[0041] In practical application, the present invention is to install the lifting platform on the vehicle chassis for use, so as to facilitate movement at any time as needed. Specifically, the lower half of the first-layer tower 11 of the lifting tower 1 is hinged on the vehicle chassis through the shaft 12, the vertical cylinder is hinged between the middle part of the first-layer tower 11 and the vehicle chassis through the pin 13, and a horizontal lock hole 14 is set on one side of the upper end of the first-layer tower 11, and a vertical lock hole 15 is set at the lower end of the first-layer tower 11. Among them, the horizontal locking cylinder and the vertical locking cylinder are respectively installed on the vehicle chassis, the piston rod of the horizontal locking cylinder is connected to the horizontal locking pin matched with the horizontal locking hole 14, and the piston rod of the vertical locking cylinder is connected to the vertical locking pin matched with the vertical locking hole 15. Through the above settings, the lifting platform and the signal transceiver equipment can be quickly transported to the required site through the vehicle chassis. During transportation, the lifting platform is in a lying state (horizontal state) on the chassis of the vehicle, and the lying lock pin is inserted into the lying lock hole 14 to lock the state; after arriving at the site, the lying lock pin is pulled out from the lying lock hole 14, and the lifting platform is changed from the lying state to the vertical state by lifting the vertical cylinder, and the vertical lock pin is inserted into the vertical lock hole 15 to lock the state, and then the lifting platform and the signal transceiver equipment are raised to the required height by the lifting cylinder to perform signal transceiver work. When the lifting platform is in the lying state, the present invention usually arranges the drag chain 3, the cable 4, the U-shaped guard plate 5 and the drag chain box 6 on the lower side of the lifting platform, that is, the lower side of the first-layer tower frame 11 of the lifting tower 1.

[0042] Based on the same concept, the present invention also provides a control method for the above-mentioned lifting platform cable lifting device, comprising the following steps:

[0043] S1. When the lifting platform is in a lying state, the lying lock pin is driven to be pulled out from the lying lock hole 14 by the lying lock cylinder to unlock the lifting platform in the lying state.

[0044] S2, the lifting platform is turned around the axis 12 by the vertical cylinder, so that it is erected from the lying position to the vertical position. When the lifting platform is erected to the right position, the vertical locking cylinder drives the vertical locking pin to insert into the vertical locking hole 15 to lock the lifting platform in the vertical state. Through this step, the lifting platform is turned from the lying position (horizontal state) to the vertical position (vertical state).

[0045] S3, the tower frames 11 and the platform 2 of the lifting tower 1 except the first layer are gradually raised by the lifting cylinder, and the drag chains 3 and cables 4 of each section move with the rise of the corresponding tower frame 11. Among them, a signal transceiver device is installed on the platform 2, and the cable 4 connecting the signal transceiver device will move with the drag chain 3.

[0046] S4, when the lifting tower 1 and the platform 2 are raised to the right position, the lifting cylinder is stopped and kept in the state. Thus, the erection and lifting process of the lifting platform is completed.

[0047] S5. When the lifting platform is withdrawn, the tower frames 11 and the platform 2 on all floors of the lifting tower 1 except the first floor are driven to gradually descend by the lifting cylinder, and each section of the drag chain 3 and the cable 4 moves with the descent of the corresponding tower frame 11.

[0048] S6. When the lifting tower 1 and the platform 2 are lowered to their proper positions, the lifting cylinders are stopped and maintained in the same state.

[0049] S7, the vertical locking cylinder drives the vertical locking pin to be pulled out from the vertical locking hole 15 to unlock the lifting platform in the vertical state, and the vertical lifting cylinder drives the lifting platform to turn around the axis 12 to turn it from the vertical position to the lying position.

[0050] S8, when the lifting platform falls into place, the vertical oil cylinder is stopped and the lying position locking cylinder drives the lying position locking pin to insert the lying position locking hole 14 to lock the lifting platform in the lying position. So far, the withdrawal and falling process of the lifting platform have been completed.

[0051] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the protection scope of the present invention. Without departing from the design concept of the present invention, various modifications made by those skilled in the art based on the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A lifting platform cable lifting device, the lifting platform comprising a lifting tower (1) and a platform (2), the lifting tower (1) comprising n-layer tower frames (11) which are slidably matched in sequence, the tower frames (11) of the remaining layers except the first layer tower frame (11) are driven by a lifting cylinder to perform lifting movement, the platform (2) is fixed on the n-th layer tower frame (11) and is used to install a signal transceiver device, characterized in that: The cable lifting device comprises m sections of drag chains (3) arranged on a lifting tower (1), m≥2, m×2+1=n, two ends of the xth section of the drag chain (3) are correspondingly fixed on the (x-1)×2+1th layer and the x×2+1th layer of the tower frame (11), 1≤x≤m, and cables (4) connecting signal transceiver equipment are arranged in sequence in the m sections of the drag chain (3).

2. A lifting platform cable lifting device according to claim 1, characterized in that: The n-layer tower frames (11) of the lifting tower (1) are arranged in sequence from the outside to the inside, wherein the first-layer tower frame (11) is located at the outermost layer, and the n-layer tower frame (11) is located at the innermost layer.

3. A lifting platform cable lifting device according to claim 2, characterized in that: Both ends of the m-segment drag chain (3) are respectively fixed to corresponding towers (11) via adapter frames (31).

4. A lifting platform cable lifting device according to claim 3, characterized in that: The m sections of drag chains (3) are located on the same side of the lifting tower (1) and are arranged layer by layer from the outside to the inside, wherein the first section of the drag chain (3) is located at the outermost layer and the mth section of the drag chain (3) is located at the innermost layer.

5. The cable lifting device for a lifting platform according to claim 4, characterized in that: A plurality of U-shaped guard plates (5) distributed at intervals are fixed on the first-layer tower frame (11) of the lifting tower (1), and the m-segment drag chains (3) are all located at the inner side of the plurality of U-shaped guard plates (5).

6. The cable lifting device for a lifting platform according to claim 5, characterized in that: A drag chain box (6) located inside a plurality of U-shaped guard plates (5) is fixed on the first-layer tower frame (11) of the lifting tower (1), and the m-segment drag chains (3) are all located in the drag chain box (6).

7. The cable lifting device for a lifting platform according to claim 6, characterized in that: The lifting tower (1) comprises 7 layers of tower frames (11) which are slidably matched in sequence, i.e., n=7, and the cable lifting device comprises 3 sections of drag chains (3) arranged on the lifting tower (1), i.e., m=3.

8. The cable lifting device for a lifting platform according to claim 7, characterized in that: The drag chain (3) is made of steel and / or aluminum, the outer width of the drag chain (3) is 200 mm, the pitch of the drag chain (3) is 45 mm, the section height of the drag chain (3) is 30 mm, and the total length of the three sections of the drag chain (3) is 40 m.

9. The cable lifting device for a lifting platform according to claim 8, characterized in that: The lower half of the first-layer tower frame (11) of the lifting tower (1) is hinged on the vehicle chassis through an axle rotation (12); a vertical cylinder is hinged between the middle part of the first-layer tower frame (11) and the vehicle chassis through a pin shaft (13); a horizontal locking hole (14) is provided on one side of the upper end of the first-layer tower frame (11); a vertical locking hole (15) is provided at the lower end of the first-layer tower frame (11); a horizontal locking cylinder and a vertical locking cylinder are respectively installed on the vehicle chassis; the piston rod of the horizontal locking cylinder is connected to a horizontal locking pin matched with the horizontal locking hole (14); the piston rod of the vertical locking cylinder is connected to a vertical locking pin matched with the vertical locking hole (15).

10. A control method for the lifting platform cable lifting device according to claim 9, characterized in that: The following steps are involved: S1. When the lifting platform is in a lying state, the lying lock pin is driven out of the lying lock hole (14) by the lying lock cylinder to unlock the lifting platform in the lying state; S2, the lifting platform is driven to rotate around the axis (12) by the vertical cylinder to flip it so that it is erected from a horizontal position to a vertical position. When the lifting platform is erected to the right position, the vertical locking cylinder drives the vertical locking pin to be inserted into the vertical locking hole (15) to lock the lifting platform in the vertical state; S3, driving the tower frames (11) and the platform (2) of the lifting tower (1) on all floors except the first floor to gradually rise by means of the lifting cylinder, and each section of the drag chain (3) and the cable (4) moves along with the rise of the corresponding tower frame (11); S4. When the lifting tower (1) and the platform (2) are raised to their proper positions, the lifting cylinder is stopped and maintained in the same state; S5. When the lifting platform is withdrawn, the tower frames (11) and the platform (2) of the lifting tower (1) other than the first layer are driven to gradually descend by the lifting cylinder, and each section of the drag chain (3) and the cable (4) moves along with the descending of the corresponding tower frame (11); S6. When the lifting tower (1) and the platform (2) are lowered to their proper positions, the lifting cylinder is stopped and maintained in the state; S7, the vertical locking cylinder drives the vertical locking pin to be pulled out from the vertical locking hole (15) to unlock the lifting platform in the vertical state, and the vertical lifting cylinder drives the lifting platform to rotate around the axis (12) to flip it so that it falls from the vertical position to the lying position; S8, when the lifting platform is in the lying position, the vertical cylinder is stopped and the lying position locking cylinder drives the lying position locking pin to be inserted into the lying position locking hole (14) to lock the lifting platform in the lying state.

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