Side opening type logging pulley hoisting device

By designing a side-open logging pulley lifting device, the problem of inconvenience in the cable installation and replacement of pulley components in the prior art is solved, and the rapid disassembly and assembly of pulley components and the convenient installation of cables are realized, improving the operating efficiency of logging operations.

CN222877529UActive Publication Date: 2025-05-16CHINA NAT PETROLEUM CORP +1
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Patent Information

Application Number
CN202421949325.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-13
Publication Date
2025-05-16
Estimated Expiration
2034-08-13

AI Technical Summary

Technical Problem

There are inconveniences in the cable installation and replacement of existing pulley assemblies, especially in well logging operations, and cable installation removal and pulley assemblies replacement cannot be achieved.

Method used

A side-open logging pulley lifting device is designed, including pulleys, hoist lug components and side frames. The pulley is vertically rotatably installed on the side frame. The hoist lug components are located above the side frame and can be detached and connected, and a special hoist pin connection is used to achieve rapid disassembly and assembly.

Benefits of technology

It realizes the convenience of cable installation and the rapid replacement of pulley components. Even in the logging state, it can easily replace pulley components and install cables, making the operation simple and fast.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a side open type logging pulley hoisting device which comprises a pulley, a lifting lug assembly and a side frame, and the pulley is vertically and rotatably installed on the side frame. The lifting lug assembly is located above the side frame and detachably connected with the side frame. The utility model has the beneficial effects of simple structure and reasonable design, adopts the side opening type structural design, can laterally open the lifting lug assembly, exposes the position of the pulley for installing the cable, facilitates the installation of the cable, adopts the special lifting lug pin for connection at the side opening part, can realize quick disassembly and assembly, and can ensure that the cable is not damaged even if the cable is loosened in a logging operation state. And the pulley assembly can be replaced, and the operation is convenient and fast.
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Description

Technical Field

[0001] The utility model relates to the technical field of pulley hoisting equipment, in particular to a side-opening well logging pulley hoisting device. Background Art

[0002] The pulley is one of the commonly used ground load-bearing tools in logging operations, which can be used to guide the path of the cable and suspend the load. When installing the cable, the common pulley assembly is often installed by threading or removing the pulley, which has certain limitations, is inconvenient to install, and can only be installed in advance; and when the cable is in operation, it is impossible to install and disassemble the cable and replace the pulley assembly, which brings more inconvenience in actual logging operations. Utility Model Content

[0003] The utility model provides a side-opening well logging pulley hoisting device, aiming to solve the problems in the prior art.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A side-opening logging pulley hoisting device comprises a pulley, a lifting lug assembly and a side frame, wherein the pulley is vertically rotatably mounted on the side frame; the lifting lug assembly is located above the side frame and is detachably connected to the side frame.

[0006] The beneficial effects of the utility model are as follows: the utility model has a simple structure and a reasonable design. It adopts a side-opening structural design, and the lifting ear assembly can be opened laterally to expose the position of the pulley cable installation, which is convenient for cable installation. The side-opening part adopts a special lifting ear pin connection, which can realize quick disassembly and assembly. Even in the logging operation state, the pulley assembly can be replaced by loosening the cable, and the operation is convenient and quick.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the side frame includes two side panels, which are vertically opposite to each other and detachably connected, and the pulley is vertically rotatably installed between the two side panels; the lifting ear assembly is located above the two side panels and is detachably connected to the two side panels respectively.

[0009] The beneficial effect of adopting the above further solution is that the two side panels are detachably connected to the lifting ear assembly and the pulley, respectively, which is convenient for disassembly and assembly, saving time and effort.

[0010] Furthermore, the two side panels are detachably connected via a plurality of quick pins.

[0011] The beneficial effects of adopting the above further solution are simple structure, reasonable design, use of multiple quick pins to achieve quick disassembly and assembly between the two side panels, easy operation, time saving and labor saving.

[0012] Furthermore, a central axis is installed between the two side plates for horizontal rotation, and the pulley is sleeved on the central axis for vertical rotation.

[0013] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the use of the central axis to realize the rotational assembly of the pulley on the two side plates, which is convenient for assembly.

[0014] Furthermore, one end of the central axis passes through one of the side plates and is fixedly sleeved with a limit plate; the other end of the central axis is detachably sleeved with a locking sleeve.

[0015] The beneficial effect of adopting the above further scheme is simple structure and reasonable design. A limiting plate is used to limit one of the side plates, and a locking sleeve is used to lock the central axis to prevent the two side plates from slipping off the central axis respectively, thereby ensuring the stability of the pulley assembly.

[0016] Furthermore, both sides of the lower end of the lifting ear assembly are detachably connected to the two side panels through lifting ear pins.

[0017] The beneficial effects of adopting the above further solution are simple structure and reasonable design. The ear assembly uses two ear pins to achieve detachable connection with the two side panels, which is convenient for assembly and saves time and effort.

[0018] Furthermore, each of the ear pins includes a pin shaft, a limiting mechanism and a locking mechanism, and the pin shaft horizontally passes through the ear assembly and the corresponding side plate; the limiting mechanism is installed at one end of the pin shaft, and the locking mechanism is installed at the other end of the pin shaft.

[0019] The beneficial effect of adopting the above further scheme is that during assembly, the pin shaft is used to penetrate the lifting ear assembly and the corresponding side plate, and the limiting mechanism and the locking mechanism are used to ensure the stability of the assembly of the pin shaft, the lifting ear assembly and the locking mechanism. The structure is simple and the design is reasonable.

[0020] Furthermore, the limiting mechanism is a limiting plate, and the limiting plate is fixedly sleeved on one end of the pin shaft.

[0021] The beneficial effects of adopting the above further solution are simple structure and reasonable design. The limit plate can be used to prevent the corresponding side plate from slipping off the pin shaft, thereby ensuring the stability of the assembly.

[0022] Furthermore, the locking mechanism includes a movable rod and a locking piece, one end of the movable rod is rotatably connected to the other end of the pin shaft, and can be rotated to be parallel or perpendicular to the pin shaft; the locking piece is installed on the other end of the movable rod, and is used to lock the movable rod when the movable rod is rotated to be perpendicular to the pin shaft.

[0023] The beneficial effect of adopting the above further solution is that during the assembly process, when the movable rod rotates to be parallel to the pin shaft, the entire pin shaft can be pulled out from the lifting ear assembly and the side plate, thereby realizing the disassembly of the side plate and the lifting ear assembly;

[0024] When the movable rod is rotated to be perpendicular to the pin shaft, the locking member is used to lock the movable rod to prevent the pin shaft from slipping off the lifting ear assembly and the side plate.

[0025] Furthermore, the movable rod has a structure with one end being thin and the other end being thick, and a slot is provided on one side of the other end of the pin shaft; the locking member includes a positioning sleeve and an elastic member, and the positioning sleeve is slidably mounted on the other end of the movable rod, and its end close to the slot is tapered; the elastic member is slidably mounted on the other end of the pin shaft, and its two ends are respectively abutted against the other end of the pin shaft and the corresponding end of the positioning sleeve, and the tapered end of the positioning sleeve can be stuck in the slot under the elastic force of the elastic member.

[0026] The beneficial effect of adopting the above further scheme is simple structure and reasonable design. When the movable rod is rotated to be perpendicular to the pin shaft, the positioning sleeve is stuck in the groove at the end of the pin shaft under the elastic force of the elastic member, preventing the pin shaft from slipping with the lifting ear assembly and the side plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the hanging ear pin in the utility model;

[0029] Figure 3 It is a structural schematic diagram of the locking mechanism in the utility model;

[0030] Figure 4 It is a structural schematic diagram of the assembly of a single side frame and a lifting eye assembly in the utility model;

[0031] Figure 5 It is a structural schematic diagram of a single side frame in the utility model.

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1. Lifting ear assembly; 2. Side frame; 21. Side plate; 22. Socket; 3. Pulley; 4. Middle shaft; 5. Locking sleeve; 6. Lifting ear pin; 61. Pin shaft; 62. Limiting mechanism; 63. Locking mechanism; 7. Quick pin. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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, the terms "first", "second", etc. 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.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection 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.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] Example 1

[0039] like Figures 1 to 5 As shown, this embodiment provides a side-opening logging pulley lifting device, including a pulley 3, a lifting ear assembly 1 and a side frame 2, wherein the pulley 3 is vertically rotatably mounted on the side frame 2; the lifting ear assembly 1 is located above the side frame 2 and is detachably connected to the side frame 2.

[0040] This embodiment has a simple structure and a reasonable design. It adopts a side-opening structural design. The lifting ear assembly can be opened laterally to expose the position of the pulley cable installation, which is convenient for cable installation. The side opening is connected by a special lifting ear pin, which can be quickly disassembled and assembled. Even in the logging operation state, the pulley assembly can be replaced by loosening the cable, and the operation is convenient and quick.

[0041] Example 2

[0042] On the basis of Example 1, in this embodiment, the side frame 2 includes two side panels 21, the two side panels 21 are vertically distributed opposite to each other and are detachably connected, and the pulley 3 is vertically rotatably installed between the two side panels 21; the ear assembly 1 is located above the two side panels 21, and is detachably connected to the two side panels 21 respectively.

[0043] The two side plates 21 are detachably connected to the lifting ear assembly 1 and the pulley 3 respectively, which is convenient for disassembly and assembly, saving time and effort.

[0044] Example 3

[0045] On the basis of Embodiment 2, in this embodiment, the two side panels 21 are detachably connected via a plurality of quick pins 7 .

[0046] This solution has a simple structure and a reasonable design. It uses a plurality of quick pins 7 to achieve quick disassembly and assembly between the two side panels 21, is easy to operate, and saves time and effort.

[0047] Based on the above solution, multiple pairs of insertion holes 22 for matching multiple quick pins 7 are evenly spaced on the edges of the two side plates 21 , and the multiple quick pins 7 pass through the multiple pairs of insertion holes 22 respectively.

[0048] Example 4

[0049] On the basis of any one of Embodiments 2 to 3, in this embodiment, a central axis 4 is horizontally rotatably installed between the two side plates 21, and the pulley 3 is vertically rotatably sleeved on the central axis 4.

[0050] This solution has a simple structure and a reasonable design. The central shaft 4 is used to realize the rotational assembly of the pulley on the two side plates 21, and the assembly is convenient.

[0051] Preferably, in this embodiment, the central axis 4 is preferably a cylindrical structure.

[0052] Example 5

[0053] On the basis of Example 4, in this embodiment, one end of the central axis 4 passes through one of the side plates 21 and is fixedly sleeved with a limit plate; the other end of the central axis 4 is detachably sleeved with a locking sleeve 5.

[0054] This solution has a simple structure and a reasonable design. A limiting plate is used to limit one of the side plates 21, and a locking sleeve 5 is used to lock the central axis 4 to prevent the two side plates 21 from slipping off the central axis 4, thereby ensuring the stability of the pulley 3 assembly.

[0055] Preferably, in this embodiment, the locking sleeve 5 can be threadedly connected to the other end of the central shaft 4 .

[0056] Alternatively, the locking sleeve 5 may also be connected to the other end of the central shaft 4 by means of bolts.

[0057] Example 6

[0058] On the basis of the above embodiments, in this embodiment, both sides of the lower end of the ear assembly 1 are detachably connected to the two side panels 21 through ear pins 6 respectively.

[0059] This solution has a simple structure and a reasonable design. The ear assembly 1 uses two ear pins 6 to achieve a detachable connection with the two side panels 21, which is convenient for assembly and saves time and effort.

[0060] Example 7

[0061] On the basis of Example 6, in this embodiment, each of the ear pins 6 includes a pin shaft 61, a limiting mechanism 62 and a locking mechanism 63, and the pin shaft 61 horizontally passes through the ear assembly 1 and the corresponding side plate 211; the limiting mechanism 62 is installed at one end of the pin shaft 61, and the locking mechanism 63 is installed at the other end of the pin shaft 61.

[0062] During assembly, the pin shaft 61 is used to penetrate the lifting ear assembly 1 and the corresponding side plate 21, and the limiting mechanism 62 and the locking mechanism 63 are used to ensure the stability of the assembly of the pin shaft 61, the lifting ear assembly 1 and the locking mechanism 63. The structure is simple and the design is reasonable.

[0063] Preferably, in this embodiment, the pin shaft 61 is preferably a cylindrical structure.

[0064] In addition, two slots are provided on each side of the lower side of the lifting ear assembly 1, and two plug-in plates are provided on the upper side of the corresponding side plate 21. The two plug-in plates can be inserted into the two slots respectively, and the two plug-in plates and the lifting ear assembly 1 are provided with penetrating through holes at the positions on both sides of the corresponding two slots, and the pin shaft 61 passes through the above-mentioned multiple through holes.

[0065] Example 8

[0066] On the basis of Example 7, in this embodiment, the limiting mechanism 62 is a limiting plate, and the limiting plate is fixedly sleeved on one end of the pin shaft 61 .

[0067] This solution has a simple structure and a reasonable design. The limiting plate can be used to prevent the corresponding side plate 21 and the pin shaft 61 from slipping off, thereby ensuring the stability of the assembly.

[0068] Based on the above solution, the above-mentioned limiting plate is preferably a circular plate, and its diameter is larger than the aperture of the through hole on the lifting ear component 1.

[0069] Example 9

[0070] On the basis of any one of Examples 7 to 8, in this embodiment, the locking mechanism 63 includes a movable rod 631 and a locking piece, one end of the movable rod 631 is rotatably connected to the other end of the pin shaft 61, and can be rotated to be parallel or perpendicular to the pin shaft 61; the locking piece is installed on the other end of the movable rod 631, and is used to lock the movable rod 631 when the movable rod 631 is rotated to be perpendicular to the pin shaft 61, and the rotation angle of the above-mentioned movable rod 631 is 90°.

[0071] During the assembly process, when the movable rod 631 rotates to be parallel to the pin shaft 61, the entire pin shaft 61 can be pulled out from the lifting ear assembly 1 and the side plate 21, thereby realizing the disassembly of the side plate 21 and the lifting ear assembly 1;

[0072] When the movable rod 631 rotates to be perpendicular to the pin shaft 61 , the movable rod 631 is locked by the locking member to prevent the pin shaft 61 from slipping off the hanging ear assembly 1 and the side plate 21 .

[0073] Preferably, in this embodiment, the other end of the pin shaft 61 is provided with a penetrating U-shaped groove, and one end of the movable rod 631 extends into the U-shaped groove and is rotatably connected to both sides of the U-shaped groove through a rotating shaft.

[0074] Example 10

[0075] On the basis of Example 9, in this embodiment, the movable rod 631 has a structure with one end being thin and the other end being thick, and a slot is provided on one side of the other end of the pin shaft 61; the locking member includes a positioning sleeve 632 and an elastic member 633, and the positioning sleeve 632 is slidably mounted on the other end of the movable rod 631, and its end close to the slot is tapered; the elastic member 633 is slidably mounted on the other end of the pin shaft 61, and its two ends are respectively abutted against the other end of the pin shaft 61 and the corresponding end of the positioning sleeve 632, and the tapered end of the positioning sleeve 632 can be stuck in the slot under the elastic force of the elastic member 633.

[0076] This solution has a simple structure and a reasonable design. When the movable rod 631 rotates to be perpendicular to the pin shaft 61, the positioning sleeve 632 is stuck in the groove at the end of the pin shaft 61 under the elastic force of the elastic member 633, preventing the pin shaft from slipping off the lifting ear assembly 1 and the side plate 21.

[0077] Preferably, in this embodiment, the other end of the movable rod 631 is in a cone-shaped structure.

[0078] In addition, the positioning sleeve 632 is in a gyro-shaped structure, and its pointed cone end can be inserted into the above-mentioned slot.

[0079] Preferably, in this embodiment, the elastic member 633 is preferably a spring, which is movably sleeved on the movable rod 631 , and whose two ends are respectively in contact with the corresponding ends of the positioning sleeve 632 and the thick end of the movable rod 631 .

[0080] When installing the lifting ear pin, first insert the lifting ear pin in a straight state into the hinge hole at the corresponding position, so that the limiting structure at the end of the pin shaft is against the insertion port of the long through hole. At this time, the movable rod passes through the other end of the long through hole, and then the positioning sleeve is manually pressed to compress the elastic part, and the movable rod is manually turned 90°, and then the positioning sleeve is released. Under the action of the elastic part, the positioning sleeve is pressed into the countersunk hole on the outer cylindrical surface of the pin shaft to achieve a quick locking connection between the lifting ear assembly and the side frame.

[0081] When disassembling, press the locating sleeve tightly and compress the elastic part to make the locating sleeve disengage from the countersunk hole, manually rotate the movable rod to be straight with the pin shaft, and then take out the entire ear pin. The insertion and installation are fast and reliable, which facilitates the rapid installation of the cable.

[0082] The disassembly and assembly process of the utility model is as follows:

[0083] The two side plates 21 can be loosened by removing the locking sleeve 5. At this time, the central shaft 4 can be pulled out from the two side plates 21 to replace the pulley 3.

[0084] At the same time, when the movable rod 631 rotates to be parallel to the pin shaft 61, the entire pin shaft 61 can be pulled out from the lifting ear assembly 1 and the side plate 21, so that the two side plates 21 are separated from each other.

[0085] The side panels are used to install quick pins, which can enhance the connection stability of the side frames on both sides. The quick pins are installed in different sockets according to the direction of the cable tension, which can avoid the contact between the cable and the quick pins and the interference of the cable operation. Multiple sockets are arranged equidistantly along the circumference to meet the requirements of fixed installation at multiple angles of cable direction. The quick pin is a long pin that passes through the side panels on both sides and aligns with the sockets, which is quick and convenient to install.

[0086] When installing the cable, the following steps are specifically included: first take out all the quick pins, then take out the ear pin on one side, then flip the ear assembly sideways to open it, expose the pulley, and install the cable into the pulley; then flip and reset the ear assembly, reinsert the ear pin and lock it, finally select the appropriate jack position, reinsert the quick pin, and complete the cable installation.

[0087] The utility model realizes the hinge connection and quick insertion between the lifting ear assembly and the side frame through the lifting ear pin. When the side frames on both sides are connected with the lifting ear assembly through the lifting ear pin, the relative positions of the side frames on both sides and the lifting ear assembly are fixed. When it is necessary to install the cable, the lifting ear pin on one side is removed to separate the lifting ear assembly from the side frame on the side and realizes the hinge connection with the side frame on the side that has not been separated, so that the lifting ear assembly can be opened laterally to expose the wheel groove of the pulley. After the cable is installed in the wheel groove, the lifting ear assembly is closed again and the lifting ear pin is installed to realize the quick installation of the cable.

[0088] Among them, the ear assembly is a common suspension structure with the functions of swinging and rotating, which meets the adaptive requirements for direction changes during cable installation.

[0089] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0090] In order to overcome the deficiencies of the prior art, the utility model provides a side-opening logging pulley hoisting device, which can realize rapid disassembly and assembly of the cable body relative to the pulley in a relaxed state and rapid replacement of the pulley body, which is more convenient and quicker than traditional pulleys.

[0091] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A side-opening logging pulley hoisting device, characterized in that: It comprises a pulley (3), a lifting ear assembly (1) and a side frame (2); the pulley (3) is mounted on the side frame (2) in a vertically rotatable manner; the lifting ear assembly (1) is located above the side frame (2) and is detachably connected to the side frame (2).

2. The side-opening logging pulley hoisting device according to claim 1 is characterized in that: The side frame (2) comprises two side panels (21), the two side panels (21) are vertically arranged opposite to each other and are detachably connected, and the pulley (3) is vertically rotatably installed between the two side panels (21); the lifting ear assembly (1) is located above the two side panels (21) and is detachably connected to the two side panels (21).

3. The side-opening logging pulley hoisting device according to claim 2 is characterized in that: The two side panels (21) are detachably connected via a plurality of quick pins (7).

4. The side-opening logging pulley hoisting device according to claim 2, characterized in that: A central shaft (4) is installed between the two side plates (21) in a horizontally rotatable manner, and the pulley (3) is sleeved on the central shaft (4) in a vertically rotatable manner.

5. The side-opening logging pulley hoisting device according to claim 4 is characterized in that: One end of the central axis (4) passes through one of the side plates (21) and is fixedly sleeved with a limit plate; the other end of the central axis (4) is detachably sleeved with a locking sleeve (5).

6. The side-opening logging pulley hoisting device according to any one of claims 2 to 5, characterized in that: Both sides of the lower end of the lifting ear assembly (1) are detachably connected to the two side panels (21) via lifting ear pins (6) respectively.

7. The side-opening logging pulley hoisting device according to claim 6, characterized in that: Each of the hanging ear pins (6) comprises a pin shaft (61), a limiting mechanism (62) and a locking mechanism (63); the pin shaft (61) horizontally passes through the hanging ear assembly (1) and the corresponding side plate (21); the limiting mechanism (62) is installed at one end of the pin shaft (61), and the locking mechanism (63) is installed at the other end of the pin shaft (61).

8. The side-opening logging pulley hoisting device according to claim 7, characterized in that: The limiting mechanism (62) is a limiting plate, and the limiting plate is fixedly sleeved on one end of the pin shaft (61).

9. The side-opening logging pulley hoisting device according to claim 7, characterized in that: The locking mechanism (63) comprises a movable rod (631) and a locking member. One end of the movable rod (631) is rotatably connected to the other end of the pin shaft (61) and can be rotated to be parallel or perpendicular to the pin shaft (61). The locking member is installed on the other end of the movable rod (631) and is used to lock the movable rod (631) when the movable rod (631) is rotated to be perpendicular to the pin shaft (61).

10. The side-opening logging pulley hoisting device according to claim 9, characterized in that: The movable rod (631) is thin at one end and thick at the other end, and a slot is provided on one side of the other end of the pin shaft (61); the locking member comprises a positioning sleeve (632) and an elastic member (633); the positioning sleeve (632) is slidably mounted on the other end of the movable rod (631), and its end close to the slot is tapered; the elastic member (633) is slidably mounted on the other end of the pin shaft (61), and its two ends are respectively abutted against the other end of the pin shaft (61) and the corresponding end of the positioning sleeve (632); under the elastic force of the elastic member (633), the tapered end of the positioning sleeve (632) can be clamped in the slot.