Rotatable hoisting device

Abstract

The utility model provides a rotatable hoisting device. The rotatable hoisting device comprises a supporting bracket, a movable hoist group, a main beam and a driving unit, the supporting bracket provides a supporting effect for the main beam. And the movable hoist group is used for hoisting materials. The main beam provides a displacement track for the movable hoist set and is provided with a hoist track, a first cross beam support, a first longitudinal beam support and a driven gear. The driving unit can drive the main beam to drive the movable hoist set to move and comprises a driving gear and a rocker. The main beam of the device can rotate, the mounting position of the movable hoist group can be adjusted, the hoisting range is wide, the structure is simple and compact, the device can be rotated to be close to a wall when not used, plant space occupation is reduced, and the device can be popularized to indoor installation and use. In addition, the device is provided with a driving unit and an ingot locking unit, through rocker operation, the rotating speed of the main beam of the device is controllable, material hoisting is stable, and stress is balanced.

Description

Technical Field

[0001] This utility model relates to the field of material transfer technology in the hydropower sector, and particularly to a component hoisting device, especially a rotatable hoisting device. Background Technology

[0002] In the maintenance of turbine generator units in large hydropower stations, the hoisting of mechanical equipment is a crucial step. However, due to limitations imposed by terrain and geological conditions, the large size and dense arrangement of power generation modules, the compact design of functional areas, and safety considerations under mountain and water pressure, the underground powerhouse space of these large hydropower stations is often limited. This often makes it impossible to directly provide the necessary space for cranes to operate, or to temporarily move equipment within the powerhouse, according to the crane installation requirements for maintenance or material handling.

[0003] Existing hoisting methods include the following multiple approaches.

[0004] 1. Secure the hoisting equipment at the designated lifting points.

[0005] Select sturdy lifting point locations and ensure their load-bearing capacity meets requirements; install secure lifting points and connect appropriate lifting equipment; conduct trial lifts to adjust balance and stability; operate slowly and monitor the entire process during actual lifting; and take safety measures, such as setting up warning lines and prohibiting personnel from staying under the lifting equipment.

[0006] However, when using such hoisting equipment, materials are prone to tilting or shaking. In particular, there is a risk of the hoisting equipment breaking when the load on the equipment is slightly unbalanced. This poses a significant safety hazard to personnel and equipment when transferring large hydropower materials and equipment.

[0007] 2. Bridge crane

[0008] Bridge cranes are widely used in equipment installation, inspection and maintenance during the construction and operation of hydropower stations. Before use, it is necessary to install parts such as rails and main beams in a way that ensures the installation site is balanced and free of debris.

[0009] The track of a bridge crane has very high requirements for levelness and straightness, which means that the bridge crane has high requirements for the overall quality of the plant space and foundation. At the same time, when facing the working environment of underground powerhouses in mountainous hydropower stations (which may be on a slight slope) or underground powerhouses with uneven ground, the installation of this type of equipment is limited and cannot achieve safe lifting effect.

[0010] 3. Rotating structure hoisting equipment

[0011] Rotating structure hoisting equipment is a type of equipment widely used in the construction materials industry. It typically allows hoisted materials to reach their transfer location in a relatively stable and short-distance manner within three-dimensional space, adapting to changes in height and rotation angle. However, current hoisting equipment is often a fixed column structure, dependent on the ground or foundation for fixation, due to the demands of construction materials usage. For example, CN119176487A discloses a conveying and hoisting device for intelligent jacking steel platforms used in construction materials.

[0012] However, the support column requires a foundation for support, and the ground surface of the underground powerhouse may not meet the installation requirements due to dense equipment layout or geological conditions. Furthermore, the fixed installation of the column-type crane cannot meet the frequent changes in lifting position required in hydropower station maintenance scenarios (disassembly and reinstallation are time-consuming and labor-intensive, affecting maintenance efficiency). At the same time, the rotation radius and angle of traditional rotary cranes are limited by the position of the column, making it difficult to adapt to the complex three-dimensional lifting paths of hydropower stations (such as bypassing turbines, generators, and cable trays).

[0013] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the inventors studied a large number of documents and patents when making this utility model, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that this utility model does not possess the features of these prior art. On the contrary, this utility model already possesses all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Utility Model Content

[0014] To address the shortcomings of existing technologies, this utility model provides a rotatable hoisting device, comprising:

[0015] The support bracket provides support for the main beam, and its two sides are connected to the main beam and the fixed surface, respectively.

[0016] The main beam is equipped with a hoist track, a first longitudinal beam support, and a driven gear. The hoist track is connected to the mobile hoist assembly.

[0017] Mobile hoist assembly;

[0018] The drive unit, comprising a drive gear and a rocker arm, is used to drive the main beam to deflect.

[0019] The hoist track is connected to the first support of the longitudinal beam, allowing the hoist track to rotate around the first support of the longitudinal beam as its axis. The driven gear is coaxially mounted to rotate with the first support of the longitudinal beam. The driving gear is coaxially mounted to rotate with the rocker arm.

[0020] The driven gear meshes with the driving gear, so that the driving gear, controlled by the rocker arm, controls the rotation of the main beam when it rotates.

[0021] According to a preferred embodiment, the support bracket includes a first main beam fixing block, a second main beam fixing block, and a base plate, wherein the first main beam fixing block and the second main beam fixing block are disposed on the same side of the base plate.

[0022] According to a preferred embodiment, a first main beam fixing hole is provided on the first main beam fixing block, and a second main beam fixing hole is provided on the second main beam fixing block, wherein the first main beam fixing hole and the second main beam fixing hole are aligned.

[0023] According to a preferred embodiment, the first support of the longitudinal beam is provided at both ends for connection with the fixing holes of the first main beam and the second main beam, respectively.

[0024] According to a preferred embodiment, the rotatable hoisting device further includes a locking unit for locking the drive unit, wherein the locking unit includes a spring seat pin and an operating element.

[0025] According to a preferred embodiment, the spring seat pin is connected to an operating member and a driven gear at its two ends, respectively. The spring seat pin, the operating member, and the driven gear are coaxially arranged. Based on the control of the operating member, the spring seat pin engages with the driven gear or the gear disk below it to restrict the rotation of the driven gear.

[0026] According to a preferred embodiment, a protective shell is provided circumferentially for the spring seat pin, and at least one first locking unit mounting hole is provided on the second main beam fixing block of the support bracket, and at least one second locking unit mounting hole is provided on the protective shell, wherein the first locking unit mounting hole and the second locking unit mounting hole cooperate with each other.

[0027] According to a preferred embodiment, the other end of the rocker arm relative to the drive gear is connected to the drive member, and the drive gear is driven by the rocker arm under the control of the drive member.

[0028] According to a preferred embodiment, the main beam is further provided with a first crossbeam support, and part or all of the first crossbeam support is connected to the first longitudinal beam support.

[0029] According to a preferred embodiment, the base plate is provided with a plurality of bolt holes. Bolts pass through the bolt holes and the fixing surface to fix the base plate to the fixing surface.

[0030] The hoisting device provided by this utility model has at least the following beneficial technical effects:

[0031] 1. Wide Lifting Range: The device of this invention is equipped with a rotatable main beam and an adjustable mobile hoist assembly, enabling lifting operations to be carried out over a wide range. This design allows a single device to cover a broad operating area, thereby improving operational flexibility and efficiency, and reducing the need for multiple stationary lifting devices.

[0032] 2. Space-saving design: The device has a simple and compact structure. When not in operation, it can be rotated to fit snugly against the wall, significantly reducing the space occupied in the factory. This feature is particularly suitable for installation in the indoor environment of underground factories, helping to improve space utilization.

[0033] 3. Precise Operation Control: The drive unit uses a joystick to precisely control the rotation speed of the main beam, ensuring material stability and balanced force distribution during hoisting. This design is crucial for tasks requiring high-precision handling, effectively preventing damage to the power generation equipment or its hoisted components (high-precision equipment parts) during transport. Attached Figure Description

[0034] Figure 1 This is an assembly drawing of the rotatable hoisting device provided by this utility model;

[0035] Figure 2 This is a structural diagram of the support bracket provided by this utility model;

[0036] Figure 3 This is a structural diagram of the main beam provided by this utility model;

[0037] Figure 4 This is a structural diagram of the drive unit and locking unit provided by this utility model.

[0038] Figure Labels

[0039] 100: Support bracket; 200: Main beam; 300: Mobile hoist assembly; 400: Drive unit; 500: Locking unit; 110: First main beam fixing block; 111: First main beam fixing hole; 112: First diagonal support; 120: Second main beam fixing block; 121: Second main beam fixing hole; 122: Drive unit mounting hole; 123: First locking unit mounting hole; 124: Second diagonal support; 130: Base plate; 131: Bolt hole; 210: Hoist rail; 220: Driven gear; 221: Gear disk; 230: Support block; 240: First crossbeam bracket; 250: First longitudinal beam bracket; 410: Drive gear; 420: Gear fixing disk; 430: Rocker arm; 510: Spring seat pin; 511: Protective shell; 5111: Second locking unit mounting hole; 520: Operating component. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings.

[0041] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "inner side", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components.

[0044] In this application, the direction of the natural descent of the movable hoist assembly 300 is indicated below.

[0045] This utility model provides a rotatable hoisting device. For example... Figure 1 As shown, the device includes a support bracket 100, a main beam 200, a mobile hoist assembly 300, a drive unit 400, and a locking unit 500.

[0046] The support bracket 100 has the function of supporting the hoisting device. For example... Figure 2 As shown, the support bracket 100 includes a first main beam fixing block 110, a second main beam fixing block 120, and a base plate 130. The first main beam fixing block 110 has a first main beam fixing hole 111 and a first diagonal support 112. The second main beam fixing block 120 has a second main beam fixing hole 121, a drive unit mounting hole 122, a first locking unit mounting hole 123, and a second diagonal support 124. The base plate 130 has bolt holes 131. The drive unit mounting hole 122 is used to install the drive unit 400. The first locking unit mounting hole 123 is used to install the locking unit 500.

[0047] According to a preferred embodiment, the first diagonal support 112 is connected at both ends to the base plate 130 and the first main beam fixing block 110, respectively, to provide stability, stiffness, and resistance to lateral forces for the first main beam fixing block 110. The diagonal support is used to enhance the strength and stiffness of the first main beam fixing block 110.

[0048] The second diagonal brace 124 is connected at both ends to the base plate 130 and the second main beam fixing block 120, respectively, providing stability, stiffness, and resistance to lateral forces for the second main beam fixing block 120. The diagonal brace is used to enhance the strength and stiffness of the second main beam fixing block 120.

[0049] The hoisting device provided by this utility model has the technical effect of enhancing safety and durability. The device includes a design of inclined supports, support blocks, and brackets; these components work together to increase the overall rigidity and strength of the device, preventing deformation during the hoisting of heavy objects. This not only extends the service life of the equipment but also significantly improves operational safety.

[0050] The first main beam fixing block 110 and the second main beam fixing block 120 are configured as connecting arms with different shapes. Preferably, the end of the first main beam fixing block 110 relative to the connecting base plate 130 is configured as an arc-shaped body. In particular, the end of the second main beam fixing block 120 relative to the connecting base plate 130 is provided with an asymmetrical drive unit mounting hole 122. Therefore, the end of the second main beam fixing block 120 relative to the connecting base plate 130 is configured as a body with a right-angle turn.

[0051] The first main beam fixing hole 111 and the second main beam fixing hole 121 cooperate and coordinate with each other to fix the main beam 200. Preferably, as shown in the figure... Figure 2 As shown, the first main beam fixing block 110 and the second main beam fixing block 120 are arranged opposite each other along the central axis of the base plate 130. The first main beam fixing hole 111 and the second main beam fixing hole 121 are arranged opposite each other along the central axis of the base plate 130, so that the main beam 200, which passes through the first main beam fixing hole 111 and the second main beam fixing hole 121 at both ends, can be parallel or parallel to the base plate 130.

[0052] According to a preferred embodiment, the first main beam fixing block 110, the second main beam fixing block 120, and the base plate 130 are integrally formed. Based on the bolt holes 131 provided on the base plate 130, bolts penetrate the base plate 130 and the fixing surface, thereby fixing the relative position of the base plate 130 and the fixing surface. The fixing surface is preferably a concrete wall surface.

[0053] The main beam 200 is the load-bearing component of the device. For example... Figure 3 As shown, the main beam 200 includes a hoist track 210, a first crossbeam support 240, a first longitudinal beam support 250, a support block 230, and a driven gear 220. The hoist track 210 is used to install or fix the mobile hoist assembly 300.

[0054] The first crossbeam support 240 is positioned above the hoist track 210. The direction above the hoist track 210 is the direction in which the hoist assembly 300 naturally hangs relative to the hoist track 210 as its central axis. Part or all of the first crossbeam support 240 is connected to the hoist track 210. The first crossbeam support 240 is used to enhance the bending moment and torque of the main beam 200, preventing deformation of the main beam 200. Preferably, the first crossbeam support 240 matches the hoist track 210 in the extending direction of the hoist track 210. The first crossbeam support 240 matches the hoist track 210 intermittently.

[0055] The first longitudinal beam support 250 is configured as a vertically mounted cylindrical component. One end of the cylindrical component is connected to one end of the hoist track 210, and the other end is connected to the same side end of the first crossbeam support 240 parallel to the hoist track 210. This structure can fix the first crossbeam support 240 and the hoist track 210. Both ends of the first longitudinal beam support 250 are respectively configured to mate with the first main beam fixing hole 111 and the second main beam fixing hole 121. Preferably, both ends of the first longitudinal beam support 250 pass through the first main beam fixing hole 111 and the second main beam fixing hole 121. The main beam 200 rotates about the first longitudinal beam support 250 as its axis.

[0056] Support blocks 230 are located at both ends of the hoist track 210 to enhance the strength and rigidity of the hoist track 210. The support blocks 230 are preferably configured to surround the first support 250 of the longitudinal beam and extend to both sides of the hoist track 210.

[0057] The driven gear 220 is disposed below the first support 250 of the longitudinal beam. The driven gear 220 meshes with the driving gear 410 to realize the force conversion and drive the main beam 200 to rotate. Preferably, a gear disk 221 connected to the driven gear 220 is disposed below the main beam 200.

[0058] like Figure 1 As shown, the mobile hoist assembly 300 is configured as a component with lifting function. The mobile hoist preferably includes an electric hoist or a manual hoist. In the field of hoisting, the mobile hoist assembly 300 is commonly used in scenarios requiring frequent movement of hoisting equipment.

[0059] The drive unit 400 is the component that enables the device to rotate. For example... Figure 4 As shown, the drive unit 400 includes a drive gear 410, a gear mounting plate 420, and a rocker arm 430. The drive gear 410 is mounted on the second main beam mounting block 120 of the support bracket 100 and meshes with the driven gear 220 on the main beam 200. The rocker arm 430 is connected below the drive gear 410 and is used to rotate the device.

[0060] The locking unit 500 is a component that enables displacement control of the device in either a stationary or rotating state. For example... Figure 4 As shown, the locking unit 500 includes a spring seat pin 510 and an operating member 520. The locking unit 500 is fixed relative to the support bracket 100 based on the first locking unit mounting hole 123. By pulling the operating member 520, the spring seat pin 510 is driven, and the locking unit 500 is engaged or disengaged to control the rotation of the driven gear 220. When the driving gear 410 is rotated in a controlled manner, the driven gear 220 that meshes with it rotates, thereby causing the first support bracket 250 of the longitudinal beam located above the driven gear 220 to rotate in the same direction. A gear disk 221 is provided on the side of the driven gear 220 near the operating member 520. The driven gear 220, the gear disk 221, and the operating member 520 are coaxially arranged.

[0061] The operating element 520 is preferably configured as a transmission rod. The spring seat pin 510 is used in the mechanical field for positioning, connecting, and securing parts. The outer diameter of the spring seat pin 510 is larger than the mounting hole diameter to secure the part firmly when inserted into the hole. The spring seat pin 510 restricts the rotation of the driven gear 220 by engaging with the driven gear 220 or the gear disc 221 below it. The spring seat pin 510 secures the driven gear through the elastic deformation and spring force of the spring.

[0062] According to a preferred embodiment, the spring seat pin 510 is connected at both ends to an operating member 520 and a driven gear 220 that meshes with the driving gear 410, respectively. Preferably, one or both ends of the spring seat pin 510 have a chamfer to limit the displacement distance of the spring seat pin 510. The operating member 520 can disengage or insert the chamfered spring seat pin 510 into the insertion hole. This structure can limit the distance by which the spring seat pin 510 drives the locking unit 500 to engage or disengage.

[0063] According to a preferred embodiment, a protective shell 511 is circumferentially provided on the spring seat pin 510. The protective shell 511 is provided with at least one second locking unit mounting hole 5111. The second locking unit mounting hole 5111 corresponds to the first locking unit mounting hole 123 on the second main beam fixing block 120, thereby fixing the relative position of the locking unit 500 and the support bracket 100. Preferably, the protective shell 511 has a U-shaped structure. The two side walls of the U-shape are directly or protrudingly provided with the second locking unit mounting holes 5111 for connection to the base plate 130 of the support bracket 100 by bolts. Preferably, the two protruding sides of the U-shape are symmetrically provided with the second locking unit mounting holes 5111.

[0064] The hoisting device provided by this utility model also features a locking mechanism. The device is equipped with a locking device for controlling the rotation of the driven gear, thereby precisely managing the rotational state of the main beam. Simultaneously, the locking mechanism is easy to operate; its vertically suspended operating component ensures that operators are not prevented from manually operating the locking unit due to the height of the hoisting device. This locking mechanism guarantees the accuracy and repeatability of the hoisting operation, while enhancing the safety and reliability of the operation process.

[0065] According to a preferred embodiment, the base plate 130 is provided with a plurality of bolt holes 131 for fixing the base plate 130 to the fixing surface.

[0066] Specifically, this device can lift materials in or out when in operation. In this application, when the locking unit 500 is in the disengaged state (or the locking unit 500 is disengaged), it means that the drive gear 410 is in the unlocked state and can rotate under the control of the operating element 520. In this application, when the locking unit 500 is in the engaged state (or the locking unit 500 is engaged), it means that the drive gear 410 is in the locked state and cannot rotate even under the control of the operating element 520.

[0067] Material hoisting process: Pulling the operating component 520 on the locking unit 500 drives the spring seat pin 510, putting the locking unit 500 in the disengaged state. Manually or by cranking the operating component 520 on the drive unit 400, the drive gear 410 rotates. Since the drive gear 410 and driven gear 220 mesh, the driven gear 220 also rotates, causing the main beam 200 to rotate above the hoisted material. Pulling the operating lever on the locking unit 500 again... Locking unit 500 is engaged, and the operator pulls the movable hoist assembly 300 to lift the heavy object; locking unit 500 is disengaged, and the hoisted heavy object is transported to the designated position by manually or by cranking the rocker arm 430 on the drive unit 400; locking unit 500 is engaged, and the operator pulls the hoist to unload the heavy object; pulling the operating component 520 on the locking unit 500 causes the locking unit 500 to disengage, and the device is rotated to be close to the wall, after which the locking unit 500 is engaged, and the lifting process ends.

[0068] Material hoisting process: Pull the operating part 520 on the locking unit 500, which drives the spring seat pin 510, putting the locking unit 500 in the disengaged state. Manually or by shaking the rocker arm 430 on the drive unit 400, the drive gear 410 is rotated. Since the drive gear 410 and the driven gear 220 mesh with each other, the driven gear 220 also rotates, thereby rotating the main beam 200 above the hoisted material. Pull the rope on the locking unit 500 again, and the locking unit 500 is engaged. Operate the hand chain hoist assembly to hoist the heavy object. The locking unit 500 is disengaged. Operate the rocker arm 430 to transport the hoisted heavy object to the designated position. The locking unit 500 is engaged again. Operate the hand chain hoist to unload the heavy object. The locking unit 500 is disengaged. Rotate the device to be close to the wall, and then engage the locking unit 500 again, ending the hoisting process.

[0069] Preferably, the driving component is a motor or other device capable of driving the rocker arm 430.

[0070] It should be noted that the specific embodiments described above are exemplary, and those skilled in the art can devise various solutions inspired by the disclosure of this utility model. These solutions all fall within the scope of this utility model and its protection. The protection scope of this utility model is defined by the claims and their equivalents.

Claims

1. A rotatable hoisting device, characterized in that, Include: The support bracket (100) provides support for the main beam (200), and its two sides are connected to the main beam (200) and the fixed surface, respectively. The main beam (200) is equipped with a hoist track (210), a first longitudinal beam support (250) and a driven gear (220), wherein the hoist track (210) is connected to the movable hoist assembly (300); Mobile hoist assembly (300); The drive unit (400) includes a drive gear (410) and a rocker arm (430) for driving the main beam to deflect; wherein, One end of the gourd track (210) is connected to the first support (250) of the longitudinal beam, so that the gourd track (210) can rotate about the first support (250) of the longitudinal beam as the axis; The driven gear (220) is coaxially and rotatably mounted with the first support (250) of the longitudinal beam; The drive gear (410) and the rocker arm (430) are coaxially arranged for rotation; wherein, The driven gear (220) meshes with the driving gear (410), so that the driving gear (410), controlled by the rocker arm (430), controls the rotation of the main beam (200) when it rotates.

2. The rotatable hoisting device according to claim 1, characterized in that, The support bracket (100) includes a first main beam fixing block (110), a second main beam fixing block (120), and a base plate (130), wherein the first main beam fixing block (110) and the second main beam fixing block (120) are disposed on the same side of the base plate (130).

3. The rotatable hoisting device according to claim 2, characterized in that, The first main beam fixing block (110) is provided with a first main beam fixing hole (111), and the second main beam fixing block (120) is provided with a second main beam fixing hole (121). The first main beam fixing hole (111) and the second main beam fixing hole (121) are aligned.

4. The rotatable hoisting device according to claim 3, characterized in that, The two ends of the first support (250) of the longitudinal beam are respectively configured to cooperate with the first main beam fixing hole (111) and the second main beam fixing hole (121).

5. The rotatable hoisting device according to claim 1, characterized in that, The rotatable hoisting device also includes a locking unit (500) of a locking drive unit (400), wherein the locking unit (500) includes a spring seat pin (510) and an operating element (520).

6. The rotatable hoisting device according to claim 5, characterized in that, The spring seat pin (510) is connected to the operating member (520) and the driven gear (220) at both ends respectively. Based on the control of the operating member (520), the spring seat pin (510) restricts the rotation of the driven gear (220) by cooperating with the driven gear (220) or the gear disk (221) below it.

7. The rotatable hoisting device according to claim 5, characterized in that, The spring seat pin (510) is provided with a protective shell (511) around its circumference. The second main beam fixing block (120) of the support bracket (100) is provided with at least one first locking unit mounting hole (123). The protective shell (511) is provided with at least one second locking unit mounting hole (5111). The first locking unit mounting hole (123) and the second locking unit mounting hole (5111) are engaged.

8. The rotatable hoisting device according to any one of claims 1 to 7, characterized in that, One end of the rocker arm (430) is connected to the drive gear (410), and the other end is connected to the drive member. Under the control of the drive member, the rocker arm (430) drives the drive gear (410).

9. The rotatable hoisting device according to any one of claims 1 to 8, characterized in that, The main beam (200) is also provided with a first crossbeam support (240), and part or all of the first crossbeam support (240) is connected to the hoist track (210).

10. The rotatable hoisting device according to any one of claims 1 to 9, characterized in that, The base plate (130) is provided with a plurality of bolt holes (131).

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