Gearbox support shaft dismounting tool

Abstract

The utility model discloses a gear box support axle dismounting frock, and specifically relates to the technical field of the removal of axle, and it is including the pressing plate, the upper end surface of pressing plate is connected with the placement base through the bolt, the outside of placement base is equipped with first fixed part and second fixed part respectively, and the hydraulic pump is placed on the placement base, and the output shaft end of hydraulic pump is equipped with the elastic guide structure. The utility model discloses through setting up the elastic guide structure, and the abutment of hydraulic pump output end and support axle, and it reaches automatic centering by taper guide, when meeting the slight deviation, the elastic support can adaptively buffer and force correction axis, fundamentally avoids the problem of jam, guarantees the stable operation, and from the operation dimension, realizes the flexible centering of support axle and hydraulic pump, gives the installation slight error tolerance, successfully conquers the industry pain point of "initial alignment difficult", greatly simplifies the operation process, and the dismounting operation efficiency is obviously promoted.

Description

Technical Field

[0001] This utility model relates to the field of shaft dismantling technology, specifically to a gearbox support shaft dismantling fixture. Background Technology

[0002] In the field of wind power equipment, the wind turbine gearbox, as a key transmission component, undertakes the core function of converting the low-speed rotation of the wind turbine into the high-speed operation of the generator. In order to ensure reliable torque transmission, the support shaft and the circular torque arm of the gearbox are connected by an interference fit. Although this design can ensure transmission stability, the removal of the support shaft becomes an important process in the scenario of disassembling or repairing the gearbox. Due to the special structural design of the support shaft, the end face screw holes are not only small in size but also limited in number, making it difficult to operate by conventional bolt pulling or other disassembly methods. Currently, the commonly used solution is the press disassembly method. This method requires first removing the entire assembly consisting of the support shaft and the gearbox from the gearbox, and then transporting the assembly to the press station. The powerful thrust of the press separates the support shaft from the gearbox. However, this process involves multiple transfers and complex operations, which is not only inefficient but also poses a potential risk of component damage due to frequent handling. Therefore, disassembly fixtures are required.

[0003] Application No. 202420252078.1 discloses a gearbox support shaft disassembly fixture, "including a hydraulic pump, a pressure plate, a first fixing group, a second fixing group, and a third fixing group. The first end of the first fixing group is connected to the pressure plate, and its second end is connected to the hydraulic pump. The first end of the hydraulic pump abuts against the pressure plate, and its second end abuts against the support shaft. The first fixing group is used to connect the pressure plate and the hydraulic pump. The first end of the second fixing group is connected to the pressure plate, and its second end is connected to the gearbox connecting stud. The first end of the third fixing group is connected to the pressure plate, and its second end is connected to the gearbox. The second and third fixing groups are used to connect the pressure plate and the gearbox." Although the disassembly of the support shaft is achieved through corresponding structural connections, during the process of the hydraulic pump injecting oil to push the support shaft, if the hydraulic system pressure control is abnormal, or if the rigid connection of the fixture components lacks buffering, once the thrust exceeds the tolerance range of the interference fit between the support shaft and the gearbox, or if the thrust direction is offset due to alignment error, it is very easy to cause deformation of the support shaft and damage to the gearbox mating surface, resulting in component damage and affecting the subsequent performance of the gearbox. Utility Model Content

[0004] The purpose of this invention is to provide a disassembly fixture for a gearbox support shaft to address the aforementioned shortcomings in the technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a gearbox support shaft disassembly fixture, comprising a pressure plate, the upper end face of which is bolted to a placement base, the outer side of which is provided with a first fixing member and a second fixing member, the first fixing member comprising a first connecting rod bolted to the pressure plate and located on one side of the hydraulic pump, the upper end face of which is connected to an internally threaded transition sleeve, the second fixing member comprising a second connecting rod bolted to the pressure plate and located on the other side of the hydraulic pump, the upper end face of which is connected to an internally and externally threaded transition sleeve, the end of which is away from the second connecting rod being connected to a bracket, and a hydraulic pump being placed on the placement base.

[0006] Preferably, a fixing component is provided on the placement base and located outside the hydraulic pump to securely fix the hydraulic pump to the placement base. (The fixing component consists of an upper fixing member and a side fixing member. The upper fixing member consists of a pressure block, a side plate, and an elastic telescopic rod. The side plate is fixedly connected to the upper end face of the placement base. The elastic telescopic rod is embedded in a pre-reserved slot in the side plate. The pressure block is rotatably connected to the free end of the elastic telescopic rod. The side fixing member consists of an end block, a threaded rod, and a clamping block with a rubber anti-slip block. The threaded rod is threadedly connected to the side plate. The clamping block is connected to one end of the threaded rod through a bearing. The end block is fixedly connected to the other end of the threaded rod.)

[0007] Specifically, in use, first place the hydraulic pump (model YBP-20S) on the placement base, and then fix it using the fixing assembly. (Hold and rotate the end block to rotate the threaded rod, causing the clamping block to move closer to the hydraulic pump until it fits, achieving lateral rigid fixation of the hydraulic pump. After completing the lateral fixation, use the elastic force of the elastic telescopic rod to pull the pressure block upwards while simultaneously bending it to position it above the hydraulic pump. At this time, the elastic telescopic rod is in a stretched and energy-storing state. Finally, release the hand, and the pressure block descends to contact the hydraulic pump, thus achieving downward pressure fixation of the hydraulic pump.) This securely fixes the hydraulic pump to the pressure plate. Subsequently, the operator moves the first connecting rod... The internal threaded transition sleeve at one end is connected to the connecting stud of the gearbox, realizing the connection between the pressure plate and one side of the gearbox. Next, the operator clamps the bracket connected to one end of the second connecting rod through the internal and external threaded transition sleeve onto the gearbox, realizing the connection between the pressure plate and the other side of the gearbox. This realizes the cooperation between the gearbox support shaft disassembly fixture and the gearbox, preparing for the disassembly of the support shaft. At this time, the hydraulic pump abuts against the gearbox support shaft. When the hydraulic pump injects oil, the output end of the hydraulic pump pushes the support shaft to move along its own axis, separating the support shaft from the gearbox, realizing the quick disassembly of the support shaft. The disassembly process is simple and efficient, and the assembly process of the gearbox support shaft disassembly fixture is simple, thereby improving the convenience of disassembling the support shaft.

[0008] Preferably, the output shaft end of the hydraulic pump is provided with an elastic guide structure for automatic alignment and buffer protection when the hydraulic pump abuts against the gearbox support shaft. The elastic guide structure includes an outer sleeve and an elastic cone sleeve, with the elastic cone sleeve located inside the outer sleeve.

[0009] Preferably, the lower end face of the outer sleeve is connected to a connecting seat, the lower end face of the connecting seat is fixedly connected to the output shaft end of the hydraulic pump, a support rod is connected inside the elastic cone sleeve, multiple connecting end blocks are connected to the outer wall of the support rod and the inner wall of the elastic cone sleeve, a guide rod is connected between two of the connecting end blocks, and a spring is sleeved on the outside of the guide rod and located between the two connecting end blocks.

[0010] Through the above technical solution:

[0011] When the output end of the hydraulic pump abuts against the support shaft, the elastic tapered sleeve is embedded in the threaded hole at the bottom of the support shaft. During the insertion process, automatic centering is achieved through the cooperation of the guide rod and the spring, as well as the tapered guidance. Minor deviations can be adaptively buffered by the elastic support, and the axis can be corrected to prevent jamming. This operation achieves "flexible centering" between the support shaft and the hydraulic pump, allowing for minor installation errors, simplifying the operation process, and greatly improving the efficiency of disassembly. On the other hand, its elasticity and adaptable structure can be adapted to the threaded holes of different support shafts, enhancing the versatility of the tooling and improving the adaptability and flexibility of the gearbox support shaft disassembly operation.

[0012] Preferably, the connection between the connecting seat and the outer sleeve is provided with an installation component. The installation component includes an installation groove formed on the upper end face of the connecting seat, an installation block embedded inside the installation groove, the upper end face of the installation block being fixedly connected to the lower end face of the outer sleeve, and a fastening bolt being threaded onto the outer wall of the connecting seat.

[0013] Specifically, the mounting block is inserted into the mounting groove, and finally the fastening bolt is tightened to connect the elastic guide structure to the output end of the hydraulic pump.

[0014] Preferably, the elastic guide structure is provided with a connecting component for realizing a quick and detachable connection between the outer sleeve and the elastic cone sleeve.

[0015] Preferably, the connecting assembly includes a connecting plate fixedly connected to the lower end face of the support rod, an insert block fixedly connected to the outer wall of the connecting plate, and a slot for cooperating with the insert block opened on the upper end face of the outer sleeve.

[0016] Preferably, the connecting assembly further includes a block groove formed on the outer wall of the outer sleeve and located on one side of the slot. A connecting post is embedded in the outer wall of the block, and a retaining strip is connected to one end of the connecting post. A retaining groove adapted to the retaining strip is formed on the outer wall of the outer sleeve and located outside the block groove. An elastic rod is connected in the rod groove reserved in the connecting post, and the free end of the elastic rod is rotatably connected to the retaining strip.

[0017] Through the above technical solution:

[0018] Before use, the insert block is first inserted into the slot, so that the connecting plate is embedded in the outer sleeve. At the same time, the vertical locking strip is also embedded in the slot. Finally, the groove on the surface of the locking strip is pulled outward, and the elastic rod is used to pull the locking strip out of the slot. Then, the locking strip is rotated 90 degrees, and finally the locking strip is released. The locking strip is embedded in the slot. This operation can quickly achieve the "plug-and-lock" connection between the outer sleeve and the elastic cone sleeve without tools, only by pushing, pulling and rotating by hand. In addition, when worn, the reverse operation can be performed to disassemble and replace by hand, avoiding tools from hitting surrounding parts, improving the convenience of assembly and maintenance. Moreover, when the elastic cone sleeve is worn and replaced, it is not necessary to replace the entire elastic guide structure.

[0019] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0020] 1. By setting up an elastic guide structure, when the hydraulic pump output end abuts against the support shaft, it achieves automatic centering through tapered guidance. When encountering slight deviation, the elastic support can adaptively buffer and forcibly correct the axis, fundamentally avoiding jamming problems and ensuring stable operation. From an operational perspective, it achieves "flexible centering" between the support shaft and the hydraulic pump, giving tolerance for minor installation errors, successfully overcoming the industry pain point of "difficult initial alignment," greatly simplifying the operation process, and significantly improving the efficiency of disassembly operations. From the perspective of tooling adaptability and cost, the elastic and adaptable structure can be compatible with the screw holes of different specifications of support shafts, greatly enhancing the versatility of tooling, reducing the tooling replacement cost caused by differences in support shaft specifications, improving the adaptability of gearbox support shaft disassembly operations, providing strong support for the efficient and smooth progress of the disassembly process, and effectively optimizing the economy and convenience of operations while ensuring disassembly quality.

[0021] 2. By setting up a connecting component, the outer sleeve and the elastic cone sleeve can be quickly connected before use without the need for any assembly tools. The "plug and lock" action is achieved simply by pushing, pulling and rotating by hand, which greatly improves the convenience and efficiency of assembling the elastic cone sleeve. In addition, when the elastic cone sleeve is worn, it can be quickly disassembled and replaced by hand without the need for heating equipment or special tools. This effectively avoids the impact and damage to surrounding parts caused by tool operation, simplifies the maintenance process and reduces the risk of component damage. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1This is one of the overall structural schematic diagrams of this utility model;

[0024] Figure 2 This is the second schematic diagram of the overall structure of this utility model;

[0025] Figure 3 This is a schematic diagram showing the connection between the elastic guide structure of this utility model and the hydraulic pump;

[0026] Figure 4 This is a schematic diagram of the elastic guiding structure of this utility model;

[0027] Figure 5 This is an enlarged schematic diagram of the connection between the support rod and the elastic cone sleeve of this utility model;

[0028] Figure 6 This is an enlarged schematic diagram of the connecting component of this utility model;

[0029] Figure 7 This is a schematic diagram of the connection between the insert block and the card strip of this utility model;

[0030] Figure 8 This is a schematic diagram showing the connection between the hydraulic pump and the fixed assembly of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Pressure plate; 2. First connecting rod; 3. Internal thread transition sleeve; 4. Second connecting rod; 5. Internal and external thread transition sleeve; 6. Bracket; 7. Hydraulic pump; 8. Elastic guide structure; 81. Connecting seat; 82. Outer sleeve; 83. Elastic tapered sleeve; 84. Support rod; 85. Spring; 86. Guide rod; 811. Mounting groove; 812. Mounting block; 813. Fastening bolt; 9. Connecting assembly; 91. Connecting plate; 92. Insert block; 93. Slot; 94. Block groove; 95. Connecting column; 96. Locking strip; 97. Locking groove; 98. Elastic rod; 10. Placement base; 11. Fixing assembly. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0034] This utility model provides, for example Figure 1 and Figure 2 The gearbox support shaft disassembly fixture shown includes:

[0035] A pressure plate 1 is provided, and a base 10 is bolted to the upper end of the pressure plate 1. A first fixing member and a second fixing member are respectively provided on the outer side of the base 10. The first fixing member includes a first connecting rod 2 bolted to the pressure plate 1 and located on one side of the hydraulic pump 7. An internal thread transition sleeve 3 is connected to the upper end of the first connecting rod 2. The second fixing member includes a second connecting rod 4 bolted to the pressure plate 1 and located on the other side of the hydraulic pump 7. An internal and external thread transition sleeve 5 is connected to the upper end of the second connecting rod 4. A bracket 6 is connected to the end of the internal and external thread transition sleeve 5 away from the second connecting rod 4. The hydraulic pump 7 is placed on the base 10.

[0036] Further, see Figure 8 As shown, a fixing component 11 is provided on the base 10 and located outside the hydraulic pump 7 to securely fix the hydraulic pump 7 to the base 10. (The fixing component 11 consists of an upper fixing component and a side fixing component. The upper fixing component consists of a pressure block, a side plate and an elastic telescopic rod. The side plate is fixedly connected to the upper end face of the base 10. The elastic telescopic rod is embedded in the pre-reserved slot in the side plate. The pressure block is rotatably connected to the free end of the elastic telescopic rod. The side fixing component consists of an end block, a threaded rod and a clamping block with a rubber anti-slip block. The threaded rod is threadedly connected to the side plate. The clamping block is connected to one end of the threaded rod through a bearing. The end block is fixedly connected to the other end of the threaded rod.)

[0037] Specifically, in use, first place the YBP-20S hydraulic pump 7 on the placement base 10, and then fix it using the fixing component 11. (Hold and turn the knob end block to rotate the threaded rod, causing the clamping block to move closer to the hydraulic pump 7 until it fits, achieving lateral rigid fixation of the hydraulic pump 7. After completing the lateral fixation, use the elastic force of the elastic telescopic rod to pull the pressure block upward while simultaneously bending it to place it above the hydraulic pump 7. At this time, the elastic telescopic rod is in a stretched and energy-storing state. Finally, release your hand, and the pressure block descends and contacts the hydraulic pump 7, thus achieving downward pressure fixation of the hydraulic pump 7.) This ensures that the hydraulic pump 7 is firmly fixed on the pressure plate 1. Subsequently, the operator inserts the internal threaded transition sleeve at one end of the first connecting rod 2. 3. Connect the connecting stud to the gearbox to connect the pressure plate 1 to one side of the gearbox. Next, the operator attaches one end of the second connecting rod 4 to the bracket 6 connected by the internal and external thread transition sleeve 5 to the gearbox, connecting the pressure plate 1 to the other side of the gearbox. This allows the gearbox support shaft disassembly fixture to engage with the gearbox, preparing for the disassembly of the support shaft. At this time, the hydraulic pump 7 abuts against the gearbox support shaft. When the hydraulic pump 7 injects oil, the output end of the hydraulic pump 7 pushes the support shaft to move along its own axis, separating the support shaft from the gearbox and achieving rapid disassembly of the support shaft. The disassembly process is simple and efficient, and the assembly process of the gearbox support shaft disassembly fixture is simple, thus improving the convenience of disassembling the support shaft.

[0038] This utility model provides, for example Figures 1-5 The gearbox support shaft disassembly fixture shown has an elastic guide structure 8 at the output shaft end of the hydraulic pump 7, which is used to achieve automatic centering and buffer protection when the hydraulic pump 7 comes into contact with the gearbox support shaft. The elastic guide structure 8 includes an outer sleeve 82 and an elastic cone sleeve 83, with the elastic cone sleeve 83 located inside the outer sleeve 82.

[0039] The lower end face of the outer sleeve 82 is connected to the connecting seat 81, and the lower end face of the connecting seat 81 is fixedly connected to the output shaft end of the hydraulic pump 7. The inner side of the elastic cone sleeve 83 is connected to the support rod 84. The outer wall of the support rod 84 and the inner wall of the elastic cone sleeve 83 are both connected to multiple connecting end blocks. A guide rod 86 is connected between two connecting end blocks. A spring 85 is sleeved on the outside of the guide rod 86 and located between the two connecting end blocks.

[0040] Through the above technical solution:

[0041] When the output end of the hydraulic pump 7 abuts against the support shaft, the elastic tapered sleeve 83 is embedded in the threaded hole at the bottom of the support shaft. During the insertion process, automatic centering is achieved through the cooperation of the guide rod 86 and the spring 85 and the tapered guidance. Minor deviations can be adaptively buffered by the elastic support, and the axis can be corrected to prevent jamming. This operation achieves "flexible centering" between the support shaft and the hydraulic pump 7, allowing for minor installation errors, simplifying the operation process, and greatly improving the efficiency of disassembly. On the other hand, its elasticity and adaptable structure can be adapted to the threaded holes of different support shafts, enhancing the versatility of the tooling and improving the adaptability and flexibility of the gearbox support shaft disassembly operation.

[0042] Further, see Figure 4 As shown, a mounting assembly is provided at the connection between the connecting seat 81 and the outer sleeve 82. The mounting assembly includes a mounting groove 811 opened on the upper end face of the connecting seat 81, a mounting block 812 is embedded inside the mounting groove 811, the upper end face of the mounting block 812 is fixedly connected to the lower end face of the outer sleeve 82, and a fastening bolt 813 is threadedly connected to the outer wall of the connecting seat 81.

[0043] Specifically, insert the mounting block 812 into the mounting groove 811, and finally tighten the fastening bolt 813 to achieve the connection between the elastic guide structure 8 and the output end of the hydraulic pump 7.

[0044] This utility model provides, for example Figure 4 , Figure 6 and Figure 7 The gearbox support shaft disassembly fixture shown has a connecting component 9 on the elastic guide structure 8, which is used to realize the quick and detachable connection between the outer sleeve 82 and the elastic cone sleeve 83.

[0045] The connecting assembly 9 includes a connecting plate 91 fixedly connected to the lower end face of the support rod 84. An insert 92 is fixedly connected to the outer wall of the connecting plate 91. A slot 93 that mates with the insert 92 is provided on the upper end face of the outer sleeve 82.

[0046] The connecting assembly 9 also includes a block groove 94 formed on the outer wall of the outer sleeve 82 and located on one side of the slot 93. A connecting post 95 is embedded in the outer wall of the insert block 92. One end of the connecting post 95 is connected to a retaining strip 96. A retaining groove 97 adapted to the retaining strip 96 is formed on the outer wall of the outer sleeve 82 and located outside the block groove 94. An elastic rod 98 is connected in the rod groove reserved in the connecting post 95. The free end of the elastic rod 98 is rotatably connected to the retaining strip 96.

[0047] Through the above technical solution:

[0048] Before use, first insert the insert block 92 into the slot 93 so that the connecting plate 91 is embedded in the outer sleeve 82. At the same time, the vertical retaining strip 96 is also embedded in the block groove 94. Finally, pull the groove on the surface of the retaining strip 96 outward, and use the elastic force of the elastic rod 98 to pull the retaining strip 96 out of the block groove 94. Then rotate the retaining strip 96 ninety degrees and finally release the retaining strip 96. The retaining strip 96 is then embedded in the retaining groove 97. This operation can quickly achieve the "plug-and-lock" connection between the outer sleeve 82 and the elastic cone sleeve 83 without tools, only by pushing, pulling and rotating by hand. In addition, when worn, the reverse operation can be performed to disassemble and replace by hand, avoiding tools from hitting surrounding parts and improving the convenience of assembly and maintenance. Moreover, when the elastic cone sleeve 83 is worn and replaced, it is not necessary to replace the entire elastic guide structure 8.

[0049] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A gearbox support shaft disassembly fixture, characterized in that, include: The pressure plate (1) has a mounting base (10) connected to its upper end by bolts. The outer side of the mounting base (10) is provided with a first fixing member and a second fixing member, and a hydraulic pump (7) is placed on the mounting base (10). The output shaft end of the hydraulic pump (7) is provided with an elastic guide structure (8) for automatic centering and buffer protection when the hydraulic pump (7) abuts against the gearbox support shaft. The elastic guide structure (8) includes an outer sleeve (82) and an elastic cone sleeve (83). The elastic cone sleeve (83) is located inside the outer sleeve (82). The elastic guide structure (8) is provided with a connecting component (9) for quick and detachable connection between the outer sleeve (82) and the elastic cone sleeve (83).

2. The gearbox support shaft disassembly fixture according to claim 1, characterized in that: The lower end face of the outer sleeve (82) is connected to a connecting seat (81), and the lower end face of the connecting seat (81) is fixedly connected to the output shaft end of the hydraulic pump (7). The interior of the elastic cone sleeve (83) is connected to a support rod (84). The outer wall of the support rod (84) and the inner wall of the elastic cone sleeve (83) are both connected to multiple connecting end blocks. A guide rod (86) is connected between two of the connecting end blocks. A spring (85) is sleeved on the outside of the guide rod (86) and between the two connecting end blocks.

3. The gearbox support shaft disassembly fixture according to claim 2, characterized in that: The connection between the connecting seat (81) and the outer sleeve (82) is provided with an installation component. The installation component includes an installation groove (811) opened on the upper end face of the connecting seat (81). An installation block (812) is embedded inside the installation groove (811). The upper end face of the installation block (812) is fixedly connected to the lower end face of the outer sleeve (82). A fastening bolt (813) is threadedly connected to the outer wall of the connecting seat (81).

4. The gearbox support shaft disassembly fixture according to claim 1, characterized in that: The connecting assembly (9) includes a connecting plate (91) fixedly connected to the lower end face of the support rod (84). The outer wall of the connecting plate (91) is fixedly connected to a plug (92). The upper end face of the outer sleeve (82) is provided with a slot (93) that cooperates with the plug (92).

5. The gearbox support shaft disassembly fixture according to claim 4, characterized in that: The connecting assembly (9) further includes a block groove (94) opened on the outer wall of the outer sleeve (82) and located on one side of the slot (93). A connecting post (95) is embedded in the outer wall of the insert (92). One end of the connecting post (95) is connected to a retaining strip (96). A retaining groove (97) adapted to the retaining strip (96) is opened on the outer wall of the outer sleeve (82) and located on the outside of the block groove (94). An elastic rod (98) is connected in the rod groove reserved in the connecting post (95). The free end of the elastic rod (98) is rotatably connected to the retaining strip (96).

6. The gearbox support shaft disassembly fixture according to claim 1, characterized in that: The first fastener includes a first connecting rod (2) that is bolted to the pressure plate (1) and located on the side of the hydraulic pump (7), and the upper end face of the first connecting rod (2) is connected to an internal thread transition sleeve (3).

7. The gearbox support shaft disassembly fixture according to claim 1, characterized in that: The second fastener includes a second connecting rod (4) that is bolted to the pressure plate (1) and located on the other side of the hydraulic pump (7). The upper end face of the second connecting rod (4) is connected to an internal and external thread transition sleeve (5), and the end of the internal and external thread transition sleeve (5) away from the second connecting rod (4) is connected to a bracket (6).

8. The gearbox support shaft disassembly fixture according to claim 1, characterized in that: A fixing component (11) is provided on the placement base (10) and outside the hydraulic pump (7) for securing the hydraulic pump (7) to the placement base (10).

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