Retractable herringbone derrick

Abstract

The utility model provides a retractable herringbone derrick which comprises tower columns, bases connected to the bottoms of the tower columns and derrick heads connected to the tops of the tower columns, and the derrick heads are hinged to the tops of the two tower columns to form a herringbone structure; the tower column comprises a first column section and a second column section, the lower end of the first column section is inserted into the second column section and connected with the second column section in a sliding mode, the inner side of the first column section is fixedly connected with a ratchet bar in the axial direction, the inner side of the second column section is provided with a rack groove and a locking mechanism, and the first column section is fixed through the locking mechanism. According to the retractable herringbone derrick provided by the invention, the reliability and the safety of the herringbone derrick in the stretching and retracting process can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of pole-mounting technology, specifically to a retractable A-frame pole-mounting system. Background Technology

[0002] A-frame gantry cranes are construction tools widely used in erection and support operations in various fields such as power, telecommunications, and construction. Traditional A-frame gantry cranes typically have a fixed length, which cannot be flexibly adjusted according to operational needs, thus limiting their application range.

[0003] To address this issue, telescopic A-frame poles have emerged on the market to adapt to different working heights and scenarios. For example, Chinese patent application CN221031797U discloses an A-frame pole for emergency repairs and pole erection work on collapsed power transmission and distribution towers. This pole features a first pole body and a second pole body, with a lower end of the first pole body fitted onto a connecting part and fixed by a pin. The lower end of the first pole body connects to the connecting part, and the lower end of the second pole body is inserted along the upper end of the first pole body, allowing it to extend and retract along the axis of the first pole body, thus realizing the telescopic mechanism of the A-frame pole.

[0004] However, the pin connection method is relatively simple, and its ability to withstand impacts and vibrations during transportation or under extreme working conditions is poor. This may cause the pin to fall off or break, which can easily affect the safety and efficiency of the operation. Utility Model Content

[0005] The purpose of this invention is to provide a retractable A-frame pole that can effectively improve the reliability and safety of the A-frame pole's extension and retraction process.

[0006] This application is achieved through the following technical solution, specifically:

[0007] A retractable A-frame mast includes a tower column, a base connected to the bottom of the tower column, and a mast head connected to the top of the tower column. The mast head is hinged to the tops of the two tower columns to form an A-frame structure. The tower column includes a first column section and a second column section. The lower end of the first column section is inserted into and slidably connected to the second column section. A ratchet rack is fixedly connected axially to the inner side of the first column section. A rack groove and a locking mechanism are provided on the inner side of the second column section. The first column section is fixed by the locking mechanism.

[0008] In this design, the sliding connection between the first and second columns enables flexible adjustment of the A-frame pole length, overcoming the limitations of the fixed length of traditional A-frame poles and allowing it to adapt to more diverse working heights and scenarios. Compared to pin connections and other mating connection methods, the ratchet and locking mechanism uses the interaction of multiple components to disperse and resist external forces, resulting in relatively smaller forces on individual components and a corresponding reduction in the risk of ratchet detachment or breakage. This provides a reliable and stable connection between the columns of the A-frame pole, improving its ability to withstand impacts and vibrations during transportation or under extreme conditions, and significantly enhancing the safety and efficiency of pole erection or support operations.

[0009] As an improvement to the locking mechanism in this application, the locking mechanism is disposed at the top of the rack groove. The locking mechanism includes mounting seats disposed on both sides of the rack groove and a pawl hinged between the mounting seats via a hinge shaft. The pawl is engaged with the rack in the first state.

[0010] Furthermore, the pawl is away from the ratchet rack in the second state.

[0011] As an improvement to the pawl in this application, the tail of the pawl extends into a strip-shaped operating part, and the locking mechanism also includes a spring reset mechanism mounted on the pawl.

[0012] Furthermore, the spring reset mechanism includes a clock spring mounted axially along the hinge axis.

[0013] Based on the above improvements, the upper part of the second column is further provided with a sealing element that is compatible with the first column.

[0014] As an improvement to the base in this application, the base is rotatably connected to the bottom of the second column section via a hinge.

[0015] The beneficial effects of this application are as follows:

[0016] This application's solution achieves flexible adjustment of the A-frame pole length through the sliding connection of the first and second columns, overcoming the limitations of the fixed length of traditional A-frame poles and enabling it to adapt to more diverse working heights and scenarios. Compared to mating connection methods such as pin connections, the ratchet and locking mechanism's fixing method disperses and resists external forces through the interaction of multiple components, resulting in relatively smaller forces on individual components and a corresponding reduction in the risk of ratchet detachment or breakage. This provides a reliable and stable connection between the columns of the A-frame pole, improving its ability to withstand impacts and vibrations during transportation or under extreme working conditions, and significantly enhancing the safety and efficiency of pole erection or support operations.

[0017] In addition to the technical problems solved by this utility model, the technical features constituting the technical solution, and the advantages brought about by the technical features of these technical solutions as described above, other technical problems that this utility model can solve, other technical features contained in the technical solution, and the advantages brought about by these technical features will be further explained in detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a retractable A-frame pole according to an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the inner structure of a retractable A-frame pole in an embodiment of this application;

[0020] Figure 3 This is a partial enlarged view of point a of a retractable A-frame pole in an embodiment of this application.

[0021] Figure 4 This is a schematic cross-sectional view of a retractable A-frame support at point a in an embodiment of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Tower column; 2. Base; 3. Pole head; 11. First column section; 12. Second column section; 13. Ratchet; 14. Locking mechanism; 141. Mounting seat; 142. Hinge shaft; 143. Pawl; 144. Spring. Detailed Implementation

[0024] The following will be combined with the appendix Figures 1-4 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Figure 1 A schematic diagram of a retractable A-frame gantry is shown, addressing the problems existing in the prior art, such as... Figure 1 As shown, this application embodiment provides a retractable A-frame pole, including: a tower column 1, a base 2 connected to the bottom of the tower column 1, and a pole head 3 connected to the top of the tower column 1. The pole head 3 is hinged to the top of the two tower columns 1 to form an A-frame structure.

[0026] The tower column 1 includes a first column section 11 and a second column section 12. The lower end of the first column section 11 is inserted into the second column section 12 and slidably connected thereto. A ratchet rack 13 is fixedly connected to the inner side of the first column section 11 along the axial direction. A rack groove and a locking mechanism 14 are provided on the inner side of the second column section 12. The first column section 11 is fixed by the locking mechanism 14.

[0027] Specifically, the ratchet rack 13 is axially fixedly connected to the inner side of the first column section 11, preferably by welding. The tooth shape of the ratchet rack 13 matches the locking mechanism 14. Preferably, the tooth shape of the ratchet rack 13 is any one of an asymmetrical trapezoid, an asymmetrical triangle, or an asymmetrical arc, such as... Figure 2 The ratchet rack 13 shown adopts an asymmetrical arc-shaped tooth profile. This asymmetrical tooth profile allows the ratchet rack 13 to slide unidirectionally when locked by the locking mechanism 14, extending the first segment 11, while it can only slide in the opposite direction, shortening the first segment 11, when the locking mechanism 14 is open. Furthermore, the asymmetrical trapezoidal tooth profile is characterized by inclined sides, which provides good guidance and sufficient strength when the ratchet rack 13 is fixed by the locking mechanism 14, ensuring the reliability of the herringbone strut.

[0028] The inner side of the second column section 12 is provided with a rack groove. The size of the rack groove should match the size of the ratchet 13 to ensure that the ratchet 13 can slide smoothly into the rack groove and will not dislodge during sliding. The locking mechanism 14 is used to engage with the rack groove of the ratchet 13 when the first column section 11 slides upward and extends, thereby fixing the position of the first column section 11. When the first column section 11 needs to be shortened, the locking mechanism 14 is controlled to separate from the ratchet 13, allowing the first column section 11 to slide downward. After adjusting to the required length, it is relocked to ensure that the A-frame rod remains stable during use.

[0029] It should be noted that, in order for the first column section 11 to slide axially within the second column section 12 and extend outwards from the second column section 12, the size of the first column section 11 should be slightly smaller than that of the second column section 12, meaning there is a certain gap at the connection between the first column section 11 and the second column section 12. However, during the sliding process, excessively fast sliding speed may affect the safety of the operator. To improve the safety of the A-frame pole, in one implementation, the upper part of the second column section 12 is provided with a sealing element that is compatible with the first column section 11.

[0030] Optionally, the pole head 3 is provided with hooks, mounting holes, or slots for fixing pulley blocks and other auxiliary equipment. The pole head 3 is hinged to the top of the first column section 11, and the hooks on the pole head 3 can also facilitate the operator to adjust the extension and retraction of the first column section 11.

[0031] This embodiment of the application achieves flexible adjustment of the A-frame pole length through the sliding connection of the first column section 11 and the second column section 12, overcoming the limitation of the fixed length of traditional A-frame poles and enabling it to adapt to more different working heights and scenarios. Compared with mating connection methods such as pin connections, the fixing method of the ratchet rack 13 and locking mechanism 14 disperses and resists external forces through the interaction of multiple components, making the force on a single component relatively small, and correspondingly reducing the risk of the locking mechanism 14 falling off or breaking. This provides a reliable and stable connection effect for each column section of the A-frame pole, improves the A-frame pole's ability to withstand impact and vibration during transportation or under extreme working conditions, and significantly improves the safety and efficiency of pole erection or support operations.

[0032] Figure 2 A schematic diagram of the inner structure of a retractable A-frame pole is shown. Figure 3 A magnified view of a portion of point a on a retractable A-frame support pole is shown. (See attached image.) Figures 2-3 As shown, in one implementation, the locking mechanism 14 is disposed on the top of the rack groove. The locking mechanism 14 includes mounting seats 141 disposed on both sides of the rack groove and a pawl 143 hinged between the mounting seats 141 via a hinge shaft 142. The pawl 143 is engaged with the ratchet rack 13 in the first state.

[0033] Specifically, the pawl 143 is connected to the second column 12 via a hinge shaft 142, allowing the pawl 143 to swing within a certain range. When the pawl 143 is in the first state, it engages with one tooth groove of the ratchet rack 13. When the first column 11 slides upward and extends, the pawl 143 swings along the irregular tooth shape of the ratchet, intermittently engaging with different tooth grooves of the ratchet rack 13, thus achieving intermittent adjustment of the extension degree of the first column 11. This method allows the first column 11 to be extended and its position relative to the second column 12 to be fixed without controlling the pawl 143 when the A-frame needs to be extended, achieving stable locking and flexible adjustment of the length of the retractable A-frame.

[0034] In one implementation, the pawl 143 is separated from the ratchet rack 13 in the second state.

[0035] Specifically, in the second state, the pawl 143 rotates around the hinge axis 142, causing its end portion to move away from the ratchet rack 13 and no longer engage with the teeth of the ratchet rack 13. In this state, the first column section 11 of the tower can slide freely relative to the second column section 12, facilitating the shortening of the first column section 11. When adjusted to the desired position, the pawl 143 is manually or mechanically switched from the second state to the first state, causing it to re-engage with the teeth of the ratchet rack 13, thus fixing the relative position of the first column section 11 and the second column section 12.

[0036] To further improve the practicality of flexibly adjusting the length of the A-frame pole, in one implementation, the tail of the pawl 143 extends into a strip-shaped operating part, and the locking mechanism 14 also includes a spring reset mechanism mounted on the pawl 143.

[0037] Specifically, the strip-shaped operating part is used to facilitate manual operation of the pawl 143 by the operator to switch between the first and second states. The spring reset mechanism provides a stable locking force and elastic potential energy for the pawl 143. When the length of the tower column 1 needs to be adjusted, the operator presses the strip-shaped operating part of the pawl 143, causing the pawl 143 to rotate around the hinge axis 142 to the second state, i.e., away from the ratchet rack 13. When the length adjustment is completed and the head of the pawl 143 is aligned with the tooth groove of the ratchet rack 13, the operator releases the strip-shaped operating part, allowing the pawl 143 to quickly engage with the tooth groove of the ratchet rack 13 under the action of the spring reset mechanism, thereby fixing the length of the tower column 1 again.

[0038] Figure 4 This is a schematic cross-sectional view of a retractable A-frame support at point a in an embodiment of this application, as shown below. Figure 4 As shown, preferably, the spring reset mechanism includes a spring 144 mounted axially along the hinge shaft 142. The spring 144 ensures that the pawl 143 can automatically maintain engagement with the ratchet rack 13 when no external force is applied, which helps to improve the stability and reliability of the locking mechanism 14.

[0039] In one implementation, the base 2 is rotatably connected to the bottom of the second column 12 via a hinge.

[0040] In this embodiment, the base 2 and the second column section 12 are connected by a hinge, so that the tower column 1 can rotate freely in at least one dimension. As a result, the user can flexibly adjust the angle and position of the retractable A-frame pole according to the actual operation requirements, so as to better adapt to the diverse and complex assembly operation scenarios.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set", "equipped with", "connected", and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A retractable A-frame pole, comprising: Tower column (1), base (2) connected to the bottom of the tower column (1), and pole head (3) connected to the top of the tower column (1). The pole head (3) is hinged to the top of the two tower columns (1) to form a herringbone structure. The tower column (1) is characterized in that it includes a first column section (11) and a second column section (12), the lower end of the first column section (11) is inserted into the second column section (12) and slidably connected thereto, a ratchet rack (13) is fixedly connected to the inner side of the first column section (11) along the axial direction, and a rack groove and a locking mechanism (14) are provided on the inner side of the second column section (12), and the first column section (11) is fixed by the locking mechanism (14); The locking mechanism (14) is located at the top of the rack groove. The locking mechanism (14) includes a mounting base (141) located on both sides of the rack groove and a pawl (143) hinged between the mounting base (141) via a hinge shaft (142). The pawl (143) engages with the ratchet rack (13) in the first state.

2. The retractable A-frame pole as described in claim 1, characterized in that, The pawl (143) is away from the ratchet (13) in the second state.

3. The retractable A-frame pole as described in claim 1, characterized in that, The pawl (143) extends a strip-shaped operating part from its tail end, and the locking mechanism (14) also includes a spring reset mechanism mounted on the pawl (143).

4. The retractable A-frame pole as described in claim 3, characterized in that, The spring return mechanism includes a clock spring (144) mounted axially along the hinge axis (142).

5. The retractable A-frame pole as described in any one of claims 1 to 4, characterized in that, The upper part of the second column (12) is provided with a sealing element that is compatible with the first column (11).

6. The retractable A-frame pole as described in claim 1, characterized in that, The base (2) is rotatably connected to the bottom of the second column (12) via a hinge.

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