An eccentric main shaft structure

Abstract

The present invention discloses an eccentric main shaft structure, belonging to the technical field of turning. It mainly includes an eccentric sleeve, a mandrel eccentrically arranged in the eccentric sleeve, an action arm and a locking plate. A cooling channel is arranged on the eccentric sleeve, and a first channel port and a second channel port are also arranged on the eccentric sleeve. The first channel port and the second channel port are respectively communicated with both ends of the cooling channel. The action arm includes a sliding sleeve, a piston and an elastic member. The sliding sleeve is connected to the eccentric sleeve, and the inner cavity of the sliding sleeve is communicated with the cooling channel. The piston is slidably mounted in the sliding sleeve along the radial direction of the mandrel. One end of the piston faces the cooling channel, and the other end of the piston faces the external environment. The elastic member is connected to the piston. The elastic member is used to always apply an elastic force to the piston to drive the piston to slide close to the cooling channel, and at the same time make the piston radially away from the mandrel along the radial direction of the mandrel. The locking plate is connected to the piston. The eccentric main shaft structure of the present invention can simplify the operation of adjusting the center distance of the support rollers and improve the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of turning, and particularly to an eccentric main shaft structure. Background Art

[0002] High-purity crystalline silicon is a basic raw material used in the electronics and solar photovoltaic industries. One of the important production processes in the production of crystalline silicon wafers is slicing. With the development of the photovoltaic industry, the reliability requirements for crystalline silicon slicing machines are getting higher and higher.

[0003] In order to achieve adjustable center distance between two support rollers in the existing crystalline silicon slicing machine, an eccentric main shaft structure is designed, such as Figure 1 shown. In the existing eccentric main shaft structure, the core shaft 2 is usually eccentrically installed in the eccentric sleeve 1, and the eccentric sleeve 1 is then rotatably installed on the frame. Thus, when the eccentric sleeve 1 rotates at different angles, it drives the core shaft 2 to make a circular motion around the axis of the eccentric sleeve 1, realizing the adjustment of the axis of the core shaft 2. However, when using the eccentric main shaft structure, two eccentric main shaft structures need to be respectively installed at both ends of the support roller 100, so that both ends of the support roller 100 are coaxially connected with the core shafts of the two eccentric main shaft structures. When adjusting one eccentric main shaft structure at one end, it is necessary to synchronously operate and adjust the eccentric main shaft structure at the other end, so as to ensure that the rotation angles of the two eccentric sleeves 1 at both ends of the support roller 100 are the same, in order to maintain the coaxial state of the two core shafts 2 at both ends of the support roller 100. The operation is cumbersome and the efficiency is low.

[0004] Therefore, it is necessary to provide a new eccentric main shaft structure. Summary of the Invention

[0005] Based on the above problems existing in the prior art, the purpose of the embodiment of the present invention is to provide an eccentric main shaft structure, which can simplify the operation of adjusting the center distance of the support roller and improve the operation efficiency.

[0006] To achieve the above object, the technical solution adopted by the present invention is: an eccentric main shaft structure, including an eccentric sleeve, a core shaft eccentrically arranged in the eccentric sleeve, an action arm, and a locking plate. A cooling channel is provided on the eccentric sleeve. The eccentric sleeve is further provided with a first channel port and a second channel port. The first channel port and the second channel port are respectively connected to both ends of the cooling channel. The action arm includes a sliding sleeve, a piston, and an elastic member. The sliding sleeve is connected to the eccentric sleeve, and the inner cavity of the sliding sleeve is communicated with the cooling channel. The piston is slidably installed in the sliding sleeve along the radial direction of the core shaft. One end of the piston faces the cooling channel, and the other end of the piston faces the external environment. The elastic member is connected to the piston. The elastic member is used to always apply an elastic force to the piston to drive the piston to slide close to the cooling channel, and at the same time make the piston radially away from the core shaft along the radial direction of the core shaft. The locking plate is connected to the piston, and the locking plate is close to the peripheral side wall of the core shaft. When the core shaft stops rotating, the first channel port is closed, and the cooling medium is continuously injected into the cooling channel from the second channel port, or the second channel port is closed, and the cooling medium is continuously injected into the cooling channel from the first channel port, which will increase the pressure in the cooling channel. When the pressure in the cooling channel increases to such an extent that the pressure applied to one end face of the piston facing the cooling channel is greater than the elastic force applied by the elastic member to one end face of the piston facing the external environment, the piston is pushed by the pressure difference to resist the elastic member and slide close to the core shaft along the radial direction of the core shaft, and at the same time drive the locking plate to move and abut against the core shaft, so that the core shaft is locked to the eccentric sleeve.

[0007] Further, the first channel port and the second channel port are respectively located at both ends of the eccentric sleeve. An end cover one is installed at one end of the eccentric sleeve close to the first channel port. An interface one is provided on the end cover one, and the interface one is communicated with the first channel port. An end cover two is installed at one end of the eccentric sleeve close to the second channel port. An interface two is provided on the end cover two, and the interface two is communicated with the second channel port.

[0008] Further, the cooling channel includes a main channel axially extending and provided on the eccentric sleeve. A plurality of main channels are provided on the eccentric sleeve, and the plurality of main channels are sequentially connected and communicated.

[0009] Further, a spacer is sleeved on the core shaft. A friction structure for increasing the roughness of the outer peripheral wall of the spacer is provided on the outer peripheral wall of the spacer corresponding to the locking plate.

[0010] Further, a plurality of action arms are provided on the eccentric sleeve, and the locking plate is provided with the same number as the action arms. The plurality of action arms are distributed around the axis of the core shaft and surround the core shaft.

[0011] Further, the plurality of main channels are sequentially connected in an S shape.

[0012] Further, an eccentric shaft hole is provided in the inner cavity of the eccentric sleeve, and the axis of the eccentric shaft hole deviates from the axis of the outer peripheral wall of the eccentric sleeve.

[0013] Further, the cooling flow channel is arranged around the axis of the mandrel on the eccentric sleeve.

[0014] Further, a bearing is provided between the mandrel and the eccentric sleeve.

[0015] Further, a sleeve flange is provided at one end of the eccentric sleeve.

[0016] Among the above technical solutions in the embodiments of the present invention, compared with the prior art, at least one of the following beneficial effects is achieved:

[0017] An eccentric main shaft structure provided by the present invention includes an eccentric sleeve, a mandrel eccentrically arranged in the eccentric sleeve, an action arm, and a locking plate. A cooling flow channel is provided on the eccentric sleeve, and a first flow channel port and a second flow channel port are further provided on the eccentric sleeve. The first flow channel port and the second flow channel port are respectively communicated with both ends of the cooling flow channel. The action arm includes a sliding sleeve, a piston, and an elastic member. The sliding sleeve is connected to the eccentric sleeve, and the inner cavity of the sliding sleeve is communicated with the cooling flow channel. The piston is slidably mounted in the sliding sleeve along the radial direction of the mandrel. One end of the piston faces the cooling flow channel, and the other end of the piston faces the external environment. The elastic member is connected to the piston. The elastic member is used to always apply an elastic force to the piston to drive the piston to slide close to the cooling flow channel, and at the same time make the piston slide away from the mandrel along the radial direction of the mandrel. The locking plate is connected to the piston and is close to the circumferential side wall of the mandrel. When the mandrel stops rotating, the first flow channel port is closed, and the cooling medium is continuously injected into the cooling flow channel from the second flow channel port, or the second flow channel port is closed, and the cooling medium is continuously injected into the cooling flow channel from the first flow channel port, which will increase the pressure in the cooling flow channel. When the pressure in the cooling flow channel increases to such an extent that the pressure applied to one end face of the piston facing the cooling flow channel is greater than the elastic force applied by the elastic member to one end face of the piston facing the external environment, the piston is pushed by the pressure difference to resist the elastic member and slide close to the mandrel along the radial direction of the mandrel, and at the same time drive the locking plate to move and abut against the mandrel, so that the mandrel is retracted and locked on the eccentric sleeve. In this way, when the eccentric main shaft structure provided by the present invention is installed at both ends of the support roll and the mandrel is connected to the support roll, when it is necessary to rotate and adjust the angle of the eccentric sleeve, by locking the mandrel and the eccentric sleeve, rotating one end of the eccentric sleeve can drive the eccentric sleeve in the eccentric main shaft structure at the other end to rotate synchronously at an equal angle. The operation is simpler and the efficiency is improved, solving the problem in the prior art that there is a wobble amount between the mandrel and the eccentric sleeve due to relative rotation, resulting in the mandrel being unable to rotate synchronously at an equal angle with the eccentric sleeve, and thus it is impossible to rotate one end of the eccentric sleeve alone. Description of the Drawings

[0018] The present invention will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 It is a structural schematic diagram of an existing eccentric main shaft structure.

[0020] Figure 2 It is a longitudinal sectional view of an eccentric main shaft structure provided by an embodiment of the present invention. Figure 1 .

[0021] Figure 3 It is a cross-sectional view of an eccentric main shaft structure provided by an embodiment of the present invention.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of an eccentric sleeve provided by an embodiment of the present invention.

[0023] Figure 5 It is Figure 4 a perspective schematic diagram of the shown eccentric sleeve.

[0024] Figure 6 It is a longitudinal sectional view of an eccentric main shaft structure provided by an embodiment of the present invention. Figure 2 .

[0025] Figure 7 It is a longitudinal sectional view of an eccentric main shaft structure provided by an embodiment of the present invention. Figure 3 .

[0026] Figure 8 It is a schematic diagram of the positional relationship among the mandrel, the actuating arm, and the locking plate provided by an embodiment of the present invention.

[0027] Figure 9 It is a schematic diagram of the positional relationship between the actuating arm and the locking plate provided by an embodiment of the present invention.

[0028] Figure 10 It is Figure 9 an exploded view of the shown part.

[0029] Figure 11 It is Figure 2 an enlarged schematic diagram of area A in

[0030] Figure 12 It is a longitudinal sectional view of an eccentric main shaft structure provided by an embodiment of the present invention. Figure 4 .

[0031] Among them, the reference numerals in the figure: 100, support roller; 1, eccentric sleeve; 11, eccentric shaft hole; 12, end cover one; 121, interface one; 13, end cover two; 131, interface two; 2, mandrel; 21, spacer ring; 22, friction structure; 3, cooling channel; 31, main channel; 33, channel port one; 34, channel port two; 4, actuating arm; 41, sliding sleeve; 42, piston; 43, elastic member; 5, locking plate; 6, bearing; 7, sleeve flange. Detailed implementation manners

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] It should be noted that when an element is referred to as being "connected to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly defined 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 should not be construed as a limitation to the present invention.

[0036] Referring throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the phrases "in one embodiment", "in some embodiments", or "in some of these embodiments" appearing throughout the specification do not all refer to the same embodiment. Additionally, in one or more embodiments, the specific features, structures, or characteristics may be combined in any suitable manner.

[0037] Please refer to Figures 2 to 12As shown in the figure, a description is now given of an eccentric main shaft structure provided by the present invention. This eccentric main shaft structure includes an eccentric sleeve 1, a core shaft 2 eccentrically arranged in the eccentric sleeve 1, an action arm 4, and a locking plate 5. A cooling flow channel 3 is provided on the eccentric sleeve 1. A first flow channel port 33 and a second flow channel port 34 are also provided on the eccentric sleeve 1. The first flow channel port 33 and the second flow channel port 34 are respectively connected to both ends of the cooling flow channel 3, enabling fluid to pass through the first flow channel port 33, the cooling flow channel 3, and the second flow channel port 34 in sequence, or enabling fluid to pass through the second flow channel port 34, the cooling flow channel 3, and the first flow channel port 33 in sequence, maintaining the flow state of the fluid in the cooling flow channel 3, and taking away the temperature through the flowing cooling medium to achieve the effect of cooling and temperature reduction. The action arm 4 includes a sliding sleeve 41, a piston 42, and an elastic member 43. The sliding sleeve 41 is connected to the eccentric sleeve 1, and the inner cavity of the sliding sleeve 41 is communicated with the cooling flow channel 3. The piston 42 is slidably mounted in the sliding sleeve 41 along the radial direction of the core shaft 2, such that one end of the piston 42 faces the cooling flow channel 3, and the other end of the piston 42 faces the external environment. The elastic member 43 is connected to the piston 42, and the elastic member 43 is used to always apply an elastic force to the piston 42 to drive the piston 42 to slide close to the cooling flow channel 3. At the same time, the piston 42 moves away from the core shaft 2 along the radial direction of the core shaft 2. The locking plate 5 is connected to the piston 42 and is close to the circumferential side wall of the core shaft 2. When the first flow channel port 33 and the second flow channel port 34 at both ends of the cooling flow channel 3 are opened simultaneously, the high-pressure cooling medium can circulate in the cooling flow channel 3 through the first flow channel port 33 and the second flow channel port 34, playing a role in dissipating heat from the eccentric sleeve 1. When the core shaft 2 stops rotating and it is necessary to adjust the axial position of the core shaft 2 by rotating the eccentric sleeve 1, the first flow channel port 33 is closed, and the cooling medium is continuously injected into the cooling flow channel 3 from the second flow channel port 34, or the second flow channel port 34 is closed, and the cooling medium is continuously injected into the cooling flow channel 3 from the first flow channel port 33. Since the space in the cooling flow channel 3 is limited, the pressure in the cooling flow channel 3 will increase. When the pressure in the cooling flow channel 3 increases to such an extent that the pressure exerted on one end face of the piston 42 facing the cooling flow channel 3 is greater than the elastic force exerted by the elastic member 43 on one end face of the piston 42 facing the external environment, as Figure 12 shown, the piston 42 will be pushed by the pressure difference to resist the elastic member 43 and slide close to the core shaft 2 along the radial direction of the core shaft 2. At the same time, the locking plate 5 is driven to move and abut against the core shaft 2, locking the core shaft 2 on the eccentric sleeve 1. Refer to Figure 12The locking plate 5 and the mandrel 2 shown in the figure are in a locked state. When the eccentric main shaft structure provided by the embodiment of the present invention is installed at both ends of the support roller 100 and the mandrel 2 is connected to the support roller 100, when it is necessary to rotate and adjust the angle of the eccentric sleeve 1, by locking the mandrel 2 and the eccentric sleeve 1, rotating the eccentric sleeve 1 at one end can drive the eccentric sleeve 1 in the eccentric main shaft structure at the other end to rotate synchronously at an equal angle. The operation is simpler and the efficiency is improved. It solves the problem in the prior art that there is a slop between the mandrel 2 and the eccentric sleeve 1 due to relative rotation, resulting in the mandrel 2 being unable to rotate synchronously at an equal angle with the eccentric sleeve 1, and thus the eccentric sleeve 1 at one end cannot be rotated independently.

[0038] In addition, while the eccentric main shaft structure provided by the embodiment of the present invention uses the cooling channel 3 for cooling, it also uses the cooling channel 3 as the driving source of the action arm 4, achieving the effect of simplifying the structure through function integration, and the two do not interfere with each other. When the cooling channel 3 is used for cooling, the piston 42 is prevented from moving outward by the elastic member 43 in the action arm 4. When the mandrel 2 stops rotating and the cooling channel 3 does not need to play a cooling role, the action arm 4 is driven to work by the cooling channel 3 by taking advantage of the opportunity when the mandrel 2 stops rotating, realizing excellent cooperation.

[0039] As Figure 2 shown, in some embodiments, an eccentric shaft hole 11 is provided in the inner cavity of the eccentric sleeve 1, and the axis of the eccentric shaft hole 11 deviates from the axis of the outer peripheral wall of the eccentric sleeve 1. When the eccentric sleeve 1 rotates along the axis of the outer peripheral wall of the eccentric sleeve 1, the eccentric shaft hole 11 will make a circular rotational motion around the axis of the outer peripheral wall of the eccentric sleeve 1, driving the axis of the mandrel 2 to make a circular rotational motion around the axis of the outer peripheral wall of the eccentric sleeve 1, achieving the purpose of adjusting the axis position of the mandrel 2.

[0040] As Figure 2 shown, in some embodiments, the flow channel port one 33 and the flow channel port two 34 are respectively located at both ends of the eccentric sleeve 1. An end cover one 12 is installed at one end of the eccentric sleeve 1 close to the flow channel port one 33. As Figure 6As shown, an interface one 121 is provided on the end cap one 12. The interface one 121 is communicated with the flow channel port one 33. One end of the eccentric sleeve 1 close to the flow channel port two 34 is installed with an end cap two 13. An interface two 131 is provided on the end cap two 13. The interface two 131 is communicated with the flow channel port two 34. In this way, the cooling medium can be connected to the flow channel port one 33 through the interface one 121. After passing through the cooling flow channel 3, the cooling medium is sequentially output from the flow channel port two 34 and the interface two 131, and the output cooling medium returns to the interface one 121 again to complete the cycle; or the cooling medium can be connected to the flow channel port two 34 through the interface two 131. After passing through the cooling flow channel 3, the cooling medium is sequentially output from the flow channel port one 33 and the interface one 121, and the output cooling medium returns to the interface two 131 again to complete the cycle.

[0041] As Figure 4 and Figure 5 shown, in some embodiments, the cooling flow channel 3 includes a main flow channel 31 extending along the axial direction of the eccentric sleeve 1 and provided on the eccentric sleeve 1. A plurality of main flow channels 31 are provided on the eccentric sleeve 1. The plurality of main flow channels 31 are sequentially connected and communicated. Specifically, in this embodiment, the plurality of main flow channels 31 are sequentially connected in an S shape. As Figure 5 shown, specifically, in this embodiment, the two main flow channels 31 at both ends of the cooling flow channel 3 respectively extend to the opposite end faces of the eccentric sleeve 1 to form the flow channel port one 33 and the flow channel port two 34.

[0042] As Figure 3 shown, in some embodiments, the cooling flow channel 3 is arranged around the axis of the core shaft 2 on the eccentric sleeve 1, so that the cooling flow channel 3 is evenly distributed around the core shaft 2 to cool the high temperature generated on the rotating surface between the core shaft 2 and the eccentric sleeve 1.

[0043] As Figure 2 and Figure 8 shown, in some embodiments, a spacer 21 is sleeved on the core shaft 2. A friction structure 22 for increasing the roughness of the outer peripheral wall of the spacer 21 is provided on the outer peripheral wall of the spacer 21 corresponding to the locking plate 5. When the locking plate 5 slides radially along the core shaft 2 and approaches the core shaft 2, the locking plate 5 finally abuts against the outer peripheral wall of the spacer 21, so that a frictional resistance that hinders the circumferential rotation of the core shaft 2 is generated between the locking plate 5 and the spacer 21 on the core shaft 2.

[0044] As Figure 3 shown, in some embodiments, a plurality of action arms 4 are provided on the eccentric sleeve 1. The locking plate 5 is provided with the same number as the action arms 4. The plurality of action arms 4 are distributed around the axis of the core shaft 2 around the core shaft 2, so that when the action arms 4 drive the locking plate 5 to lock the core shaft 2, the core shaft 2 can be evenly stressed around, avoiding the relative position between the axis of the core shaft 2 and the axis of the eccentric sleeve 1 from changing due to uneven stress on the circumferential side of the core shaft 2.

[0045] As Figure 2 shown, in some of these embodiments, a bearing 6 is provided between the mandrel 2 and the eccentric sleeve 1 for rotatably and stably mounting the mandrel 2 in the eccentric sleeve 1. Specifically, the outer ring of the bearing 6 is fixed to the inner peripheral wall of the eccentric shaft hole 11, and the inner ring of the bearing 6 is fixed to the outer peripheral wall of the mandrel 2. The high temperature generated by the friction heating of the bearing 6 is conducted to the eccentric sleeve 1, and then taken away by the cooling channel 3 on the eccentric sleeve 1.

[0046] As Figure 2 shown, in some of these embodiments, a sleeve flange 7 is provided at one end of the eccentric sleeve 1. The sleeve flange 7 is coaxially arranged with the eccentric sleeve 1, and the circumferential limit fixation of the eccentric sleeve 1 is realized by using the sleeve flange 7. Specifically, the eccentric sleeve 1 is rotatably mounted on the frame of the silicon wafer slicing machine, and the turnover freedom of the eccentric sleeve 1 is locked by fixing the sleeve flange 7 to the frame.

[0047] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An eccentric main shaft structure, characterized in that: It includes an eccentric sleeve, a mandrel eccentrically arranged in the eccentric sleeve, an operating arm and a locking plate. A cooling channel is provided on the eccentric sleeve. A first channel port and a second channel port are also provided on the eccentric sleeve. The first channel port and the second channel port are respectively communicated with two ends of the cooling channel. The operating arm includes a sliding sleeve, a piston and an elastic member. The sliding sleeve is connected to the eccentric sleeve, and the inner cavity of the sliding sleeve is communicated with the cooling channel. The piston is slidably mounted in the sliding sleeve along the radial direction of the mandrel. One end of the piston faces the cooling channel, and the other end of the piston faces the external environment. The elastic member is connected to the piston. The elastic member is used to always apply an elastic force to the piston to drive the piston to slide close to the cooling channel, and at the same time make the piston move away from the mandrel along the radial direction of the mandrel. The locking plate is connected to the piston, and the locking plate is close to the peripheral side wall of the mandrel. When the mandrel stops rotating, the first channel port is closed, and the cooling medium is continuously injected into the cooling channel from the second channel port, or the second channel port is closed, and the cooling medium is continuously injected into the cooling channel from the first channel port, the pressure in the cooling channel will increase. When the pressure in the cooling channel increases to such an extent that the pressure applied to one end face of the piston facing the cooling channel is greater than the elastic force applied by the elastic member to one end face of the piston facing the external environment, the piston is pushed by the pressure difference to slide close to the mandrel along the radial direction of the mandrel against the elastic member, and at the same time drives the locking plate to move and abut against the mandrel, so that the mandrel is locked to the eccentric sleeve. A spacer is sleeved on the mandrel, and a friction structure for increasing the roughness of the outer peripheral wall of the spacer is provided on the outer peripheral wall of the spacer corresponding to the locking plate.

2. The eccentric main shaft structure according to claim 1, wherein: The first channel port and the second channel port are respectively located at two ends of the eccentric sleeve. A first end cover is installed at one end of the eccentric sleeve close to the first channel port. An interface one is provided on the first end cover, and the interface one is communicated with the first channel port. A second end cover is installed at one end of the eccentric sleeve close to the second channel port. An interface two is provided on the second end cover, and the interface two is communicated with the second channel port.

3. The eccentric main shaft structure according to claim 1, characterized in that: The cooling channel includes a main channel axially extending and arranged on the eccentric sleeve. A plurality of main channels are provided on the eccentric sleeve, and the plurality of main channels are sequentially connected and communicated.

4. A kind of eccentric main shaft structure according to claim 1, characterized in that: A plurality of operating arms are provided on the eccentric sleeve. The locking plate is provided with the same number as the operating arms, and the plurality of operating arms are circumferentially distributed around the axis of the mandrel around the mandrel.

5. The eccentric main shaft structure according to claim 3, characterized in that: The plurality of main channels are sequentially connected in an S shape.

6. The eccentric main shaft structure according to claim 1, characterized in that: An eccentric shaft hole is provided in the inner cavity of the eccentric sleeve, and the axis of the eccentric shaft hole deviates from the axis of the outer peripheral wall of the eccentric sleeve.

7. An eccentric main shaft structure according to claim 1, characterized in that: The cooling channel is arranged around the axis of the mandrel and arranged on the eccentric sleeve.

8. The eccentric main shaft structure according to claim 1, characterized in that: A bearing is provided between the mandrel and the eccentric sleeve.

9. The eccentric main shaft structure according to claim 1, wherein: A sleeve flange is provided at one end of the eccentric sleeve.

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