Grinding wheel spindle structure of double-sided thinning grinding equipment

Abstract

The utility model relates to a double-sided thinning grinding equipment grinding wheel spindle structure which comprises a mounting plate, a spindle body is arranged on the mounting plate in the vertical direction, the spindle body penetrates through the mounting plate, a first bearing seat is arranged at the penetrating position, a mounting disc is arranged at one end of the spindle body, and a second bearing seat is arranged at the other end of the spindle body. A grinding wheel base body is installed on the side, back on to the spindle body, of the installation disc, the limiting assembly comprises at least two clamping blocks and clamping grooves, the clamping blocks are arranged on the side, close to the grinding wheel base body, of the installation disc, and the clamping grooves are formed in the side, close to the installation disc, of the grinding wheel base body. An adjusting assembly for driving the main shaft body to move up and down is arranged on the outer side of the main shaft body; in the utility model, the large-diameter mounting disc is arranged at the end part of the main shaft body which is vertically mounted, so that the grinding wheel base body is in full-circumferential fit with the mounting disc in a plane contact manner, and compared with the direct connection manner of the end part of the traditional main shaft, the contact area is greatly increased.

Description

Technical Field

[0001] This utility model relates to the field of microcrystalline glass grinding technology, specifically to a grinding wheel spindle structure for a double-sided thinning grinding equipment. Background Technology

[0002] Microcrystalline glass is a mixture of microcrystals and glass, made by sintering and crystallizing appropriate glass particles. It is hard, dense and uniform in texture, and the production process is pollution-free, with no radioactive pollution in the product itself, making it a new type of environmentally friendly green material.

[0003] Currently, when grinding microcrystalline glass, grinding wheels are used. After a period of use, the grinding wheel's machined surface needs to be dressed. Dressing requires mounting the grinding wheel on a spindle structure. The spindle structure adjusts the grinding wheel's position and rotates it for better coordination with the dressing mechanism. However, due to the spindle's own structure, the grinding wheel is usually mounted at the end of the spindle, resulting in a small contact area between the grinding wheel and the spindle. During high-speed dressing, the grinding wheel comes into contact with the oilstone, generating friction. Prolonged friction can cause damage to the stress point where the grinding wheel is mounted on the spindle. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a grinding wheel spindle structure for a double-sided thinning grinding equipment, which solves the technical problems of small contact area between the existing spindle and the grinding wheel and a single stress point.

[0005] The present invention relates to a grinding wheel spindle structure for a double-sided thinning grinding equipment, comprising: a mounting plate, a spindle body disposed on the mounting plate in a vertical direction, the spindle body penetrating the mounting plate and having a first bearing seat disposed at the penetration point, a mounting plate disposed at one end of the spindle body, and a grinding wheel base mounted on the side of the mounting plate facing away from the spindle body;

[0006] A limiting component is provided, comprising at least two locking blocks and locking grooves. The locking blocks are located on the side of the mounting plate near the grinding wheel base, and the locking grooves are located on the side of the grinding wheel base near the mounting plate. An adjustment component for driving the spindle body to move up and down is provided on the outer side of the spindle body.

[0007] As a further improvement of this utility model, the spindle body is a columnar structure and includes a first end and a second end. The diameter of the first end is larger than the diameter of the second end, and the first end is provided with a mounting plate and a grinding wheel base.

[0008] As a further improvement of this utility model, a through hole is provided in the center of both the mounting plate and the grinding wheel base. A mounting groove is provided on the upper surface of the grinding wheel base near the outer edge of the through hole. The diameter of the mounting groove is larger than the diameter of the through hole, and a mounting surface is formed on the bottom wall of the groove. A first threaded hole is provided in a circular array on the mounting surface. The first threaded hole passes through the grinding wheel base and the mounting plate in a vertical direction and extends into the spindle body. The mounting plate and the grinding wheel base are both connected and fixed to the first end through the first threaded hole and bolts.

[0009] As a further improvement of this utility model, the lower surface of the mounting plate is provided with a second threaded hole in an annular array near the outer edge. The second threaded hole penetrates the mounting plate in a vertical direction and extends into the grinding wheel base. The mounting plate and the grinding wheel base are connected and fixed near the outer edge by the second threaded hole and bolts.

[0010] As a further improvement of this utility model, a rotary joint for connecting with an external water source is installed at the second end of the main shaft body, and a water spray hole is opened through the shaft center position in the vertical direction inside the main shaft body. One end of the water spray hole is connected to the rotary joint, and the other end is connected to the through hole.

[0011] As a further improvement of this utility model, a spline sleeve and a protrusion that engages with the spline sleeve are provided on the outer surface of the main shaft body at the position corresponding to the mounting plate, and both ends of the spline sleeve protrude from the upper and lower surfaces of the first bearing seat.

[0012] As a further improvement of this utility model, the outer ring of the first bearing seat is fixedly connected to the mounting plate, the inner ring of the first bearing seat is slidably connected to the outer surface of the spline sleeve, a synchronous wheel is provided on the outer surface of the main shaft body at a position below the mounting plate, the inner wall of the synchronous wheel is fixedly connected to the end of the spline sleeve, and the outer surface of the synchronous wheel is connected to an external motor for driving the main shaft body to rotate.

[0013] As a further improvement of this utility model, the adjusting assembly includes a ball screw and a driving mechanism for driving the ball screw, and a main shaft sleeve disposed on the outer surface of the main shaft body. The main shaft sleeve is connected to the main shaft body through a bearing component. The moving part of the ball screw is connected and fixed to the outer surface of the main shaft sleeve. The inner wall of the main shaft sleeve is connected and fixed to the outer surface of the bearing component. The inner ring of the bearing component is connected and fixed to the outer surface of the main shaft body.

[0014] As a further improvement of this utility model, one end of the ball screw is connected to the output shaft of the drive mechanism, and the other end is connected to the second bearing seat. Both the second bearing seat and the drive mechanism are fixedly connected to the external housing.

[0015] As a further improvement of this utility model, the outer surface of the main sleeve is provided with a support assembly, the support assembly including a support cylinder mounted on the mounting plate and a fixing plate mounted on the outer surface of the main sleeve, and a floating joint provided between the support cylinder and the fixing plate.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] In this invention, a large-diameter mounting plate is provided at the end of the vertically installed spindle body, allowing the grinding wheel substrate to achieve full circumferential contact with the mounting plate through planar contact. Compared with the traditional direct connection method at the spindle end, this greatly increases the contact area. Secondly, the multiple locking blocks and locking grooves ensure that when the grinding wheel substrate and the mounting plate are connected, at least two symmetrically distributed locking blocks will embed into the corresponding locking grooves, further dispersing the stress points between the mounting plate and the grinding wheel substrate. This makes the connection between the grinding wheel substrate and the mounting plate more stable, reduces damage to the stress points, and extends the service life of the grinding wheel substrate. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional front view of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall side sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the overall side view structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the overall front view of the present utility model.

[0023] In the diagram: 1. Mounting plate; 2. Spindle body; 21. First end; 22. Second end; 3. Rotary joint; 31. Water spray hole; 4. Mounting disc; 41. Grinding wheel base; 42. Snap-fit ​​groove; 43. Snap-fit ​​block; 44. Through hole; 45. Mounting groove; 46. Second threaded hole; 451. Mounting surface; 452. First threaded hole; 5. Adjustment assembly; 51. Drive mechanism; 52. Ball screw; 53. Second bearing seat; 54. Bearing component; 55. Spindle sleeve; 521. Moving part; 6. Spline sleeve; 61. First bearing seat; 62. Synchronous pulley; 63. Protrusion; 7. Support assembly; 71. Support cylinder; 72. Fixed plate; 73. Floating joint. Detailed Implementation

[0024] The following illustrations will reveal several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in a simple schematic manner in the illustrations.

[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of this technology, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" 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. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0027] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] Please see Figure 1-4 The present invention relates to a grinding wheel spindle structure for a double-sided thinning grinding equipment, comprising: a mounting plate 1, a spindle body 2 provided on the mounting plate 1 along the vertical direction, the spindle body 2 penetrating the mounting plate 1 and having a first bearing seat 61 at the penetration point, a mounting plate 4 provided at one end of the spindle body 2, and a grinding wheel base 41 mounted on the side of the mounting plate 4 facing away from the spindle body 2.

[0029] The limiting component includes at least two locking blocks 43 and locking grooves 42. The locking blocks 43 are located on the side of the mounting plate 4 near the grinding wheel base 41, and the locking grooves 42 are located on the side of the grinding wheel base 41 near the mounting plate 4. An adjustment component 5 for driving the spindle body 2 to move up and down is provided on the outside of the spindle body 2.

[0030] Mounting plate 1 refers to the basic component used to fix and support the spindle body 2, and its material can be metal plate such as steel plate or aluminum alloy plate; spindle body 2 refers to the core shaft that bears the rotation and transmission of the grinding wheel, and is usually made of high hardness alloy steel; the first bearing seat 61 is a bearing assembly installed on mounting plate 1 to support the rotation of the spindle, and can be a rolling bearing or a sliding bearing; mounting plate 4 is a transition component connecting the spindle and the grinding wheel base 41, and is generally a disc-shaped metal part; grinding wheel base 41 refers to the execution component of the grinding operation, which is sintered from abrasive and bonding agent; the locking block 43 and locking groove 42 in the limiting component refer to the protruding positioning block and the matching groove structure, respectively, and the locking block 43 can be a cylindrical pin, a square tenon, etc.; the adjusting component 5 refers to the mechanism that drives the spindle to move, which can be a lead screw and nut mechanism, a hydraulic cylinder, or a linear motor, etc.

[0031] Mounting plate 1 and spindle body 2 are rotatably connected via first bearing seat 61. Specifically, the inner ring of first bearing seat 61 is interference-fitted with spindle body 2, and the outer ring is fixedly connected to mounting plate 1. One end of spindle body 2 is fixed to mounting plate 4 by bolts or welding. Mounting plate 4 and grinding wheel base 41 are positioned and connected by snap-fit ​​block 43 and snap-fit ​​groove 42. Bolts can also be used for fastening. Adjustment component 5 is connected to the outside of spindle body 2 via coupling or flange, driving spindle to move in the vertical direction. For example, a servo motor can be used to drive ball screw, and the screw nut can be fixed to the outer sleeve of spindle to achieve lifting and lowering motion.

[0032] The spindle body 2 passes through the mounting plate 1, and a first bearing seat 61 is provided at the through-hole. This means that the spindle body 2 passes through the pre-reserved through hole 44 in the mounting plate 1, and a bearing seat assembly is provided at the through hole 44. This bearing seat not only supports the rotation of the spindle but also ensures the relative positional accuracy between the spindle and the mounting plate 1. The "through-hole" design indicates that both ends of the spindle body 2 extend to both sides of the mounting plate 1, with one end connected to the mounting plate 4 and the other end possibly connected to the drive device. This through-hole design ensures the stability of the spindle transmission.

[0033] This design achieves overall fixation via mounting plate 1. The spindle body 2 and grinding wheel base 41 employ a detachable snap-fit ​​structure for easy grinding wheel replacement. Adjustment component 5 enables the spindle to have precise axial displacement capability. Compared to traditional fixed spindles, this structure offers advantages such as convenient assembly, high positioning accuracy, and easy maintenance. It is particularly suitable for double-sided thinning grinding processes that require frequent grinding wheel changes, effectively improving processing efficiency and product quality stability.

[0034] Please see Figure 1 and Figure 2 In this embodiment, the spindle body 2 is a columnar structure and includes a first end 21 and a second end 22. The diameter of the first end 21 is larger than the diameter of the second end 22. The first end 21 is provided with a mounting plate 4 and a grinding wheel base 41.

[0035] The larger diameter of the first end 21 compared to the second end 22 effectively increases the end diameter, enhancing the rigidity of the grinding wheel mounting surface 451 and suppressing grinding vibration. Conversely, the smaller diameter of the second end 22 reduces rotational inertia, making it easier for the spindle to achieve dynamic balance at high speeds. It is important to note that a rounded transition is used at the diameter change to avoid stress concentration. By limiting the spindle's variable diameter structure and end component configuration, this design offers significant advantages over conventional constant diameter spindles. The larger diameter first end 21 provides sufficient bending stiffness, ensuring the stability of the grinding wheel during double-sided grinding; the smaller diameter second end 22 reduces the mass of rotating components, lowering drive energy consumption; and the stepped structure facilitates the arrangement of coolant channels within the spindle, achieving effective heat dissipation in the grinding zone. This design is particularly suitable for double-sided synchronous grinding of precision parts such as semiconductor wafers.

[0036] Both the mounting disc 4 and the grinding wheel base 41 have through holes 44 at their central positions. The upper surface of the grinding wheel base 41 has a mounting groove 45 near the outer edge of the through hole 44. The diameter of the mounting groove 45 is larger than the diameter of the through hole 44, and a mounting surface 451 is formed on the bottom wall of the groove. The mounting surface 451 has a first threaded hole 452 arranged in a ring array. The first threaded hole 452 passes through the grinding wheel base 41 and the mounting disc 4 in a vertical direction and extends into the spindle body 2. The mounting disc 4 and the grinding wheel base 41 are both connected and fixed to the first end 21 through the first threaded hole 452 and bolts.

[0037] The through hole 44 refers to a circular channel that penetrates the center of the mounting disc 4 and the grinding wheel base 41. Its diameter is usually slightly larger than the size of the spindle coolant supply pipe, and it is used for the flow of cooling medium. The mounting groove 45 specifically refers to the annular groove structure machined on the upper surface of the grinding wheel base 41. Its diameter is larger than the diameter of the through hole 44 to form a stepped mounting surface 451, which is a horizontal annular plane. The first threaded hole 452 refers to the circumferentially distributed internal threaded holes on the mounting surface 451. Metric or imperial threads can be used, and the thread specification is selected from M6 to M12 according to the bolt load requirements. Bolts refer to external threaded fasteners that match the first threaded hole 452, including but not limited to hexagonal head bolts, flange bolts, or studs. This dependent claim, by defining the synergistic structure of the through hole 44, the mounting groove 45, and the threaded connection, has multiple advantages over ordinary planar connection methods: the central through hole 44 allows coolant to directly reach the grinding zone, solving the heat dissipation problem of double-sided grinding; the stepped structure formed by the mounting groove 45 can effectively resist the axial impact force of the grinding wheel and prevent bolt loosening; the annular array of first threaded holes 452 makes the fastening force more uniform and avoids the off-center deformation caused by traditional single bolt connections.

[0038] The mounting plate 4 has a second threaded hole 46 arranged in a ring near the outer edge of the lower surface. The second threaded hole 46 penetrates the mounting plate 4 vertically and extends into the grinding wheel base 41. The mounting plate 4 and the grinding wheel base 41 are connected and fixed near the outer edge by the second threaded hole 46 and bolts.

[0039] The mounting disc 4 and the outer periphery of the grinding wheel base 41 are connected through the second threaded hole 46, achieving multi-point coordinated fixation. Specifically, a blind hole coaxial with the second threaded hole 46 needs to be machined at the corresponding position on the grinding wheel base 41, with pre-tapping internal threads at the bottom of the blind hole. The diameter of the central distribution circle of the second threaded hole 46 should be larger than the radius of the grinding wheel's working surface to ensure that the grinding force mainly acts within the support ring formed by the bolt group. This connection structure, together with the first threaded hole 452 at the central through hole 44, forms a double-fixing system, jointly resisting the combined load during grinding. The addition of the outer periphery second threaded hole 46 connection structure represents a significant improvement over the method relying solely on the central connection. The annular array of second threaded holes 46 provides a uniformly distributed clamping force to the edge of the grinding wheel base 41, effectively suppressing end-face chatter caused by grinding vibration. The double-fixing system decomposes the force on the grinding wheel into a central anti-bending zone and an outer periphery anti-torsion zone. This design also facilitates the rapid replacement of the grinding wheel base 41; maintenance can be achieved simply by removing the outer periphery bolts, significantly reducing equipment downtime. This structure is particularly suitable for precision grinding applications where axial runout requirements are stringent, such as wafer thinning.

[0040] Please see Figure 1 and Figure 2 It should be noted that the second end 22 of the main shaft body 2 is equipped with a rotary joint 3 that connects to an external water source. A water spray hole 31 is opened vertically through the shaft center position inside the main shaft body 2. One end of the water spray hole 31 is connected to the rotary joint 3, and the other end is connected to the through hole 44.

[0041] The rotary joint 3 is a key component that enables a dynamic, sealed connection between the spindle and the external coolant piping. Its typical structure includes a stationary outer shell, a rotating inner core, and a sealing assembly, which can be either a mechanical seal or a graphite ring seal. The water spray hole 31 specifically refers to a precision channel with an inner diameter of 3-8 mm machined through the spindle axis. Its inner wall needs to be mirror-polished to reduce fluid resistance.

[0042] Please see Figure 1 and Figure 2 Furthermore, a spline sleeve 6 and a protrusion 63 that engage with the spline sleeve 6 are provided on the outer surface of the spindle body 2 at the position corresponding to the mounting plate 1. Both ends of the spline sleeve 6 protrude from the upper and lower surfaces of the first bearing seat 61.

[0043] The outer ring of the first bearing housing 61 is connected and fixed to the mounting plate 1. The inner ring of the first bearing housing 61 is slidably connected to the outer surface of the spline sleeve 6. A synchronous wheel 62 is provided on the outer surface of the main shaft body 2 below the mounting plate 1. The inner wall of the synchronous wheel 62 is connected and fixed to the end of the spline sleeve 6. The outer surface of the synchronous wheel 62 is connected to an external motor for driving the main shaft body 2 to rotate.

[0044] Spline sleeve 6 refers to an annular sleeve with internal splines that is fixedly connected to the outer surface of the spindle body 2. It is typically made of alloy steel and heat-treated by quenching and tempering. The spline tooth profile can be involute or rectangular. Raised bar 63 specifically refers to a key-shaped protrusion extending axially on the outer surface of the spindle body 2, forming a precise fit with the internal tooth groove of the spline sleeve 6. The number of raised bars is typically 6-12 evenly distributed. First bearing housing 61 refers to the bearing mounting housing that supports the rotation of the spindle, comprising an outer ring and an inner ring. The outer ring is fixed to the mounting plate 1, while the inner ring is rotatable. Synchronizing pulley 62 refers to a pulley or gear mounted on the lower part of the spindle. Its outer circumference has a toothed structure that meshes with the synchronous belt or gear. It is mostly made of aluminum alloy or stainless steel. The combination of spline sleeve 6 and raised bar 63 achieves multiple technical advantages: the spline connection can transmit greater torque and has a more uniform stress distribution compared to the traditional keyway connection.

[0045] Please see Figure 1 and Figure 2 Specifically, the adjustment assembly 5 includes a ball screw 52 and a drive mechanism 51 for driving the ball screw 52, ​​as well as a spindle sleeve 55 disposed on the outer surface of the spindle body 2. The spindle sleeve 55 is connected to the spindle body 2 through a bearing member 54. The moving part 521 of the ball screw 52 is connected and fixed to the outer surface of the spindle sleeve 55. The inner wall of the spindle sleeve 55 is connected and fixed to the outer surface of the bearing member 54. The inner ring of the bearing member 54 is connected and fixed to the outer surface of the spindle body 2.

[0046] One end of the ball screw 52 is connected to the output shaft of the drive mechanism 51, and the other end is connected to the second bearing seat 53. Both the second bearing seat 53 and the drive mechanism 51 are connected and fixed to the external housing.

[0047] The outer surface of the spindle sleeve 55 is provided with a support assembly 7, which includes a support cylinder 71 mounted on the mounting plate 1, a fixing plate 72 mounted on the outer surface of the spindle sleeve 55, and a floating joint 73 disposed between the support cylinder 71 and the fixing plate 72.

[0048] The ball screw 52 refers to a precision transmission component consisting of a screw, a nut, and circulating balls. The drive mechanism 51 includes, but is not limited to, a servo motor, a stepper motor, or a hydraulic motor. The spindle sleeve 55 is a cylindrical structure fitted onto the outside of the spindle body 2. The bearing component 54 refers to a combination of angular contact ball bearings or cylindrical roller bearings, whose preload is adjusted by a spacer. The support cylinder 71 can be single-acting or double-acting, and the floating joint 73 includes both ball head bearings and spherical plain bearings.

[0049] The inner bore of the main bushing 55 is machined with a bearing mounting step. The outer ring of the bearing is axially pressed by the end cover. The end cover is threaded to the main bushing 55 and a preload torque of 50-80 Nm is applied. The floating joint 73 specifically refers to the universal joint device set between the support cylinder 71 and the fixed plate 72. Its ball head swing angle is designed to be ±5°, which compensates for installation errors without affecting the support rigidity. In the support structure at both ends of the ball screw 52, ​​the second bearing seat 53 should be an adjustable self-type bearing to compensate for the deflection deformation of the screw.

[0050] The ball screw 52 transmission converts the rotational motion of the drive mechanism 51 into the linear motion of the spindle sleeve 55. The combined design of the spindle sleeve 55 and bearing 54 decouples the spindle rotation accuracy and axial adjustment function. The floating joint 73 structure of the support component 7 effectively absorbs vibration, keeping the grinding wheel stable during precision feeding.

[0051] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A grinding wheel spindle structure for a double-sided thinning grinding machine, characterized in that, include: Mounting plate (1), the mounting plate (1) is provided with a spindle body (2) along the vertical direction, the spindle body (2) passes through the mounting plate (1) and a first bearing seat (61) is provided at the penetration point, the spindle body (2) is provided with a mounting plate (4) at one end, and a grinding wheel base (41) is installed on the side of the mounting plate (4) facing away from the spindle body (2). The limiting component includes at least two locking blocks (43) and locking grooves (42). The locking blocks (43) are located on the side of the mounting plate (4) near the grinding wheel base (41), and the locking grooves (42) are located on the side of the grinding wheel base (41) near the mounting plate (4). An adjustment component (5) for driving the spindle body (2) to move up and down is provided on the outside of the spindle body (2).

2. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 1, characterized in that: The spindle body (2) is a columnar structure and includes a first end (21) and a second end (22). The diameter of the first end (21) is larger than the diameter of the second end (22). The first end (21) is provided with a mounting plate (4) and a grinding wheel base (41).

3. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 2, characterized in that: Both the mounting disc (4) and the grinding wheel base (41) have through holes (44) at their central positions. The upper surface of the grinding wheel base (41) has a mounting groove (45) near the outer edge of the through hole (44). The diameter of the mounting groove (45) is larger than the diameter of the through hole (44), and a mounting surface (451) is formed on the bottom wall of the groove. The mounting surface (451) has a first threaded hole (452) arranged in a ring array. The first threaded hole (452) passes through the grinding wheel base (41) and the mounting disc (4) in a vertical direction and extends into the spindle body (2). The mounting disc (4) and the grinding wheel base (41) are both connected and fixed to the first end (21) through the first threaded hole (452) and bolts.

4. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 3, characterized in that: The mounting disc (4) has a second threaded hole (46) arranged in a ring array near the outer edge of its lower surface. The second threaded hole (46) penetrates the mounting disc (4) in a vertical direction and extends into the grinding wheel base (41). The mounting disc (4) and the grinding wheel base (41) are connected and fixed near the outer edge by the second threaded hole (46) and bolts.

5. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 3, characterized in that: The second end (22) of the main shaft body (2) is equipped with a rotary joint (3) that connects to an external water source. A water spray hole (31) is opened through the shaft center of the main shaft body (2) in a vertical direction. One end of the water spray hole (31) is connected to the rotary joint (3), and the other end is connected to the through hole (44).

6. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 1, characterized in that: The outer surface of the spindle body (2) is provided with a spline sleeve (6) and a protrusion (63) that engages with the spline sleeve (6) at the position corresponding to the mounting plate (1). Both ends of the spline sleeve (6) protrude from the upper and lower surfaces of the first bearing seat (61).

7. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 6, characterized in that: The outer ring of the first bearing housing (61) is connected and fixed to the mounting plate (1), the inner ring of the first bearing housing (61) is slidably connected to the outer surface of the spline sleeve (6), and a synchronous wheel (62) is provided on the outer surface of the main shaft body (2) below the mounting plate (1). The inner wall of the synchronous wheel (62) is connected and fixed to the end of the spline sleeve (6), and the outer surface of the synchronous wheel (62) is connected to an external motor for driving the main shaft body (2) to rotate.

8. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 1, characterized in that: The adjustment assembly (5) includes a ball screw (52) and a drive mechanism (51) for driving the ball screw (52), and a spindle sleeve (55) disposed on the outer surface of the spindle body (2). The spindle sleeve (55) is connected to the spindle body (2) through a bearing (54). The moving part (521) of the ball screw (52) is connected and fixed to the outer surface of the spindle sleeve (55). The inner wall of the spindle sleeve (55) is connected and fixed to the outer surface of the bearing (54). The inner ring of the bearing (54) is connected and fixed to the outer surface of the spindle body (2).

9. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 8, characterized in that: One end of the ball screw (52) is connected to the output shaft of the drive mechanism (51), and the other end is connected to the second bearing seat (53). The second bearing seat (53) and the drive mechanism (51) are both connected and fixed to the external housing.

10. The grinding wheel spindle structure of a double-sided thinning grinding equipment according to claim 8, characterized in that: The outer surface of the main shaft sleeve (55) is provided with a support assembly (7), the support assembly (7) includes a support cylinder (71) mounted on the mounting plate (1) and a fixing plate (72) mounted on the outer surface of the main shaft sleeve (55), and a floating joint (73) provided between the support cylinder (71) and the fixing plate (72).

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