Spindle head for workpiece surface grinding

Abstract

The utility model relates to a spindle head for grinding the surface of a workpiece. The spindle head comprises a rotating assembly, a shell and an oil storage tank, a protective cover is arranged on the surface of the shell; a cavity is formed in the shell, the rotating assembly is rotatably installed in the cavity, the end of the upper end of the rotating assembly extends out of the protective cover and is provided with a grinding head, and the lower end of the rotating assembly is connected with the motor. The shell is provided with an oil conveying hole, the oil conveying hole penetrates through the cavity, and the cavity can be filled with lubricating oil through the oil conveying hole; oil storage grooves are formed between the outer part of the rotating assembly and the inner wall of the shell, between the upper surface of the shell and the protective cover and between the cavity and the base; the cavity is filled with lubricating oil through the oil conveying hole, the rotating assembly driven by the motor rotates, and the grinding head is driven to grind the workpiece; when the rotating assembly rotates, lubricating oil flowing towards the protective cover and the base is stored through the oil storage grooves formed in the corresponding positions, and leakage is avoided. The lubricating device has the advantages that the rotating assembly is fully lubricated, and lubricating oil leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece surface processing and grinding accessories, in particular to a spindle head for grinding the surface of a workpiece. Background Art

[0002] Nowadays, there are high requirements for the surface of workpieces in mechanical workshops, so it is necessary to grind and polish the surface of workpieces. The traditional polishing method is to polish the object in a rough and fine way by the high-speed rotation (about 3000 revolutions / min) of the rotating shaft head of a polishing machine.

[0003] However, at present, the spindle head equipped with a grinding head is usually driven by a motor to rotate to grind and polish the surface of the workpiece. There is a certain friction between the rotating shaft head and the housing during the high-speed rotation of the rotating shaft head, and a certain amount of lubricating oil needs to be added to the device for lubrication. However, the currently used grinding tools usually set up an oil delivery pipe to lubricate the rotating shaft, but the rotating shaft is not fully lubricated. Moreover, after the lubricating oil enters the tool, due to the high-speed rotation of the rotating shaft head, there will be a certain degree of leakage of the lubricating oil inside it, which not only causes waste of the lubricating oil, but also the leaked lubricating oil will contaminate both the polishing tool and the workpiece.

[0004] Therefore, based on the deficiencies of the existing device feedback by customers, the inventor made further improvements according to the proposed defects and deficiencies to overcome the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a spindle head for grinding the surface of a workpiece that can fully lubricate the rotating component and avoid leakage of lubricating oil.

[0006] The purpose of the utility model is realized by the following technical solutions: A spindle head for grinding the surface of a workpiece, characterized in that it includes a housing, a protective cover, a base, and a rotating component;

[0007] The housing is cylindrical, with a protective cover arranged at the upper end of the housing and a base arranged at the lower end of the housing;

[0008] The housing has a cylindrical cavity, through holes are axially opened on the protective cover and the base, the middle part of the rotating component is located in the cylindrical cavity and the two are installed in cooperation with bearings, and both ends of the rotating component extend out of the protective cover and the base respectively through the corresponding through holes;

[0009] The end of the rotating component extending out of the base is connected to a rotation driving mechanism, and a grinding head is installed at the end of the rotating component extending out of the protective cover;

[0010] An oil delivery hole that can be opened and closed is opened on the housing, and the oil delivery hole is communicated with the cylindrical cavity of the housing;

[0011] A ring-shaped sealing surface is formed by surface-to-surface contact between the protective cover and the outer shell. An oil storage groove A is provided at the inner diameter of the ring-shaped sealing surface, and a ring-shaped sealing ring is also provided between the ring-shaped sealing surfaces.

[0012] When the cavity is filled with oil through the oil delivery hole and the rotating assembly rotates under the action of the driving mechanism, the grinding head is driven to grind the workpiece, and the oil on the outer wall of the rotating assembly is thrown into the oil storage groove A for storage, so that the oil will not leak out through the gap between the wall of the through hole of the protective cover and the cylindrical surface of the rotating assembly.

[0013] As a preferred technical solution of the present application, an annular groove is provided on the outer side of the rotating assembly and at the position where it contacts the protective cover and the outer shell. The groove is located inside the oil storage groove A, and a second circular ring spacer is provided in the groove to block the leakage of oil.

[0014] As a preferred technical solution of the present application, the rotating assembly includes an inner shaft and a shaft sleeve;

[0015] The shaft sleeve is rotatably inserted into the cavity of the outer shell. The lower end of the shaft sleeve is connected to the motor through a locking disc, and the inner shaft is inserted into the through hole of the shaft sleeve and fixed to the shaft sleeve through a plurality of fixing blocks;

[0016] A grinding head is provided at the upper end of the inner shaft, and an eccentric block is provided below the grinding head.

[0017] As a preferred technical solution of the present application, the lower end of the outer shell is open, the base is connected to the lower surface of the outer shell by screws, an installation hole is provided at the center of the base, the locking disc is inserted into the installation hole, and the end of the shaft sleeve is inserted into the locking disc and the extended end is connected to the motor.

[0018] As a preferred technical solution of the present application, inside the outer shell and above the cavity, an annular groove is provided on the inner wall of the outer shell, and at the same time, an oil storage groove B is provided on the cylindrical side surface of the relative shaft sleeve;

[0019] The lubricating oil flowing towards the protective cover is first stored in the oil storage groove B, and the excess oil continues to flow to the oil storage groove A for storage.

[0020] As a preferred technical solution of the present application, the locking disc is fixed through the lower end of the shaft sleeve and inserted into the base. A circumferential gap is formed between the upper surface of the locking disc and the inner side of the cylinder above the base as the oil storage groove C, and the lubricating oil flowing towards the base is stored in the oil storage groove C.

[0021] As a preferred technical solution of the present application, a ball bearing A, a ball bearing B, and a ball bearing C are sequentially installed at a certain interval from top to bottom on the outer circumference of the shaft sleeve in the cavity, and first circular ring spacers are provided on the outer circumference of the shaft sleeve between the ball bearing A and the ball bearing B and between the ball bearing B and the ball bearing C.

[0022] The utility model has the following advantages:

[0023] (1) Fully lubricate the rotating components;

[0024] Some current grinding and polishing tools usually have oil pipes or oil channels to lubricate the rotating shaft, but the rotating shaft is not fully lubricated and is still affected by a certain friction resistance; in this solution, an oil hole is provided on the side wall of the shell, and the oil hole directly penetrates the cavity of the shell, and the lubricating oil can be directly filled into the cavity through the oil hole, so that the rotating component can be fully lubricated during rotation, thereby reducing the rotation friction;

[0025] (2) An oil storage tank is provided to prevent the lubricating oil from leaking out when the rotating components rotate;

[0026] After the lubricating oil enters the interior of the grinding tool, the grinding head on the top of the spindle head contacts the surface of the workpiece for rotational grinding, and the lubricating oil inside the tool will flow toward the top and bottom of the tool. There is no blocking structure in the tool, which causes the lubricating oil to leak out, causing pollution to the tool itself and the workpiece being processed. In this scheme, an oil storage tank A is provided between the outer shell and the protective cover of the spindle head, and an oil storage tank B is provided between the inner wall of the outer shell and the sleeve. When the lubricating oil flows toward the protective cover, it is first stored in the oil storage tank B, and the excess oil continues to flow to the oil storage tank A for storage. At the same time, an oil storage tank C is opened under the cavity where the rotating component is installed, and the lubricating oil flowing toward the base flows to the oil storage tank C for storage, thereby avoiding leakage of the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the utility model from the first perspective;

[0028] Figure 2 It is a structural schematic diagram of the utility model from a second viewing angle;

[0029] Figure 3 This is a schematic diagram of the structure of the utility model after removing the protective cover;

[0030] Figure 4 This is a schematic diagram of the structure of the utility model after the rotating assembly is inserted with the locking disk;

[0031] Figure 5 It is a schematic diagram of the structure of the utility model in side section;

[0032] Figure 6 It is a schematic structural diagram of the side section view of the rotating assembly of the utility model after being inserted into the base;

[0033] In the figure: 1 - outer shell, 2 - base, 3 - inner shaft, 4 - bushing, 5 - protective cover, 6 - cavity, 7 - grinding head, 8 - eccentric block, 9 - first ring-shaped spacer, 10 - oil delivery hole, 11 - oil storage tank A, 12 - oil storage tank B, 13 - oil storage tank C, 14 - ball bearing A, 15 - ball bearing B, 16 - ball bearing C, 17 - second ring-shaped spacer, 18 - locking disc, 19 - induction detector, 20 - annular sealing ring. Detailed implementation manner

[0034] The following further describes the present utility model in conjunction with the attached drawings, but the protection scope of the present utility model is not limited to the following description.

[0035] It should be noted that the orientation or positional relationship indicated by "left", "right", etc. is based on the orientation or positional relationship shown in the attached drawings, or the orientation or positional relationship in which the invention product is habitually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0036] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0037] It should be noted that for the spindle head used for grinding and polishing the surface of a workpiece, a grinding head for grinding is provided at the end of the spindle head, and the other end of the spindle head is connected to a driving mechanism capable of providing high-speed rotational force. When the driving mechanism is started, the spindle head is directed downward and the grinding head of the spindle head contacts the surface of the workpiece for rotational grinding and polishing.

[0038] Therefore, based on the above problems, referring to Figure 1 , the present utility model proposes a spindle head for grinding the surface of a workpiece to solve the problems.

[0039] (Embodiment 1)

[0040] Referring to Figures 1 to 6 , the spindle head for grinding the surface of a workpiece proposed in this implementation manner includes a rotating assembly, an outer shell 1, and a base 2;

[0041] Among them, referring to Figure 1 and Figure 5 , a protective cover 5 is installed on the upper surface of the outer shell 1, and a cavity 6 is provided inside the outer shell 1, and a base 2 is provided below the outer shell 1;

[0042] Among them, referring to Figure 3 and Figure 5, the rotating assembly includes a bushing 4 and an inner shaft 3; the bushing 4 is installed in the cavity 6 of the housing 1, the inner shaft 3 is inserted into the bushing 4, the upper end of the inner shaft 3 passes through the protective cover 5, and a grinding head 7 is installed at the end where it passes through, and an eccentric block 8 is arranged below the grinding head 7; the lower end of the bushing 4 extends out of the base 2 and is connected to the motor, and the motor drives the rotating assembly to rotate in the cavity 6, thereby driving the eccentric block 8 to perform a centrifugal motion, that is, driving the grinding head 7 to process the workpiece;

[0043] Among them, referring to Figure 3 and Figure 6 , in the cavity 6 of the housing 1, a plurality of ball bearings are equidistantly sleeved on the outer periphery of the bushing 4, and the rotating assembly rotates well in the cavity 6 through the ball bearings;

[0044] Among them, referring to 1 and Figure 2 , an oil injection hole 10 is opened on the side wall of the housing 1, the oil injection hole 10 communicates with the cavity 6, and lubricating oil can be poured into the cavity 6 through the oil injection hole 10 and fill the entire cavity 6, which plays a sufficient lubrication role in the rotation of the rotating assembly;

[0045] Among them, referring to Figure 4 , between the protective cover 5 and the housing 1, a ring-shaped sealing surface is formed between the surfaces, an oil storage groove A11 is opened at the inner diameter of the ring-shaped sealing surface, and a ring-shaped sealing ring 20 is also provided between the ring-shaped sealing surfaces;

[0046] Among them, referring to Figure 5 , a plurality of oil storage grooves B12 are provided on the upper part of the bushing 4 inserted into the housing 1, and the oil storage grooves B12 are through holes, which penetrate from the outer surface of the bushing 4 to its inner wall;

[0047] Among them, referring to Figure 6 , a ring-shaped oil storage groove C13 is opened below the cavity 6 of the housing 1;

[0048] During operation, the lower end of the bushing 4 is connected to the motor, the motor is started, and the rotating assembly rotates, thereby driving the grinding head 7 to grind the workpiece. Before starting the motor, the cavity 6 is filled with lubricating oil through the oil injection hole 10, so that the rotating rotating assembly is fully lubricated. At the same time, when the grinding head 7 needs to be placed sideways or in contact with the workpiece downward for grinding, in order to prevent the lubricating oil from being thrown out due to the rotation of the rotating assembly, oil storage grooves B12 are provided on the bushing 4, and an oil storage groove A11 is provided between the housing 1 and the protective cover 5 to prevent lubricating oil from leaking. At the same time, an oil storage groove C13 is also provided below the cavity 6 to store the lubricating oil flowing towards the base 2.

[0049] Currently, the tools used for grinding the surface of workpieces on the market usually set a rotating shaft in the housing 1 body, and grind the workpiece through the grinding disc set on the rotating shaft. However, the rotation of the rotating shaft inside the housing 1 body will generate certain friction. Currently, the tools usually set an oil delivery pipe to lubricate the rotating shaft, but the rotating shaft is not fully lubricated. And when injecting lubricating oil into the cavity 6 to contact the rotating shaft, due to the high-speed rotation of the rotating shaft, the tool does not have a structure to prevent the leakage of lubricating oil. The lubricating oil leaks as the rotating shaft rotates, which not only wastes the lubricating oil but also pollutes the surrounding environment. In this solution, the cavity 6 and the oil delivery hole 10 are designed to cooperate inside the housing 1, and the lubricating oil can be directly injected into the entire cavity 6 to fully lubricate the rotating components. And there are oil storage grooves between the upper surface of the housing 1 and the protective cover 5, between the inside of the housing 1 and the bushing 4, and below the cavity 6 where the rotating components are installed. Through the oil storage grooves, the lubricating oil will not leak out when the rotating components rotate.

[0050] In this embodiment, referring to Figure 1 and Figure 5 , for the housing 1, the housing 1 is an irregular cylinder, and has a cylindrical cavity 6 inside for installing the rotating components. A through hole adapted for the rotating components to extend out is opened above the cavity 6. The bottom of the housing 1 is open and a disc edge extends outward from the bottom of the housing 1. The disc edge extends downward to form a short cylinder, and there is a stepped table surface at the inner lower edge of the short cylinder. The base 2 is formed by connecting a large-diameter cylinder and a small-diameter cylinder, and there is a small disc at the connecting position of the large-diameter cylinder and the small-diameter long cylinder. The small disc is adaptively inserted into the short cylinder of the housing 1, and the large-diameter cylinder is adaptively inserted into the stepped table surface of the short cylinder of the housing 1. At the same time, threaded holes are circumferentially opened on the small disc, and the base 2 is connected to the housing 1 by screws.

[0051] In this embodiment, referring to Figure 4 and Figure 6 , for the rotating components, the rotating components include the inner shaft 3 and the bushing 4. The bushing 4 is inserted into the cavity 6 of the housing 1. At the same time, three ball bearings (from top to bottom are ball bearing A14, ball bearing B15, ball bearing C16) are installed in the cavity 6. The three ball bearings are sleeved on the outer periphery of the bushing 4 at certain intervals in sequence. A first circular cushion block 9 is arranged between the ball bearing A14 and the ball bearing B15, and between the ball bearing B15 and the ball bearing C16. The inner shaft 3 is a cylinder, and the inner shaft 3 is inserted into the inside of the bushing 4. A plurality of fixing blocks are arranged between the outer periphery of the inner shaft 3 and the bushing 4 so that the inner shaft 3 can rotate with the bushing 4. The upper end of the inner shaft 3 penetrates through the bushing 4 and a grinding head 7 is opened at the protruding end. The grinding head 7 is cross-shaped, and an eccentric block 8 is sleeved below the grinding head 7 so that the grinding head 7 makes a centrifugal motion when rotating, thereby increasing the grinding area and improving the working efficiency.

[0052] In this embodiment, referring toFigure 4 and Figure 6 The bushing 4 passes through the protective cover 5 and its end is flush with the upper surface of the protective cover 5. An annular groove is formed at the contact position between the protective cover 5 and the bushing 4. A second circular ring spacer 17 (located in the annular groove) is sleeved outside the bushing 4. At the same time, after the lower surface of the protective cover 5 is fixed to the upper surface of the housing 1 with screws on the outer periphery of the second circular ring spacer 17, an annular sealing surface is formed between the protective cover 5 and the housing 1. When the spindle head is directed downward and the grinding head 7 contacts the workpiece surface, there is a risk of oil leakage in the annular sealing surface. Therefore, an oil storage groove A11 is formed at the inner diameter of the annular sealing surface, and an annular sealing ring 20 is also provided between the sealing surfaces. Above the cavity 6 of the housing 1 and below the second circular ring spacer 17, a circular ring groove is formed on the inner wall of the housing 1, and at the same time, an oil storage groove B12 is formed on the corresponding bushing 4. The lubricating oil entering the cavity 6 from the oil injection hole 10 is divided into two flow directions. One is towards the protective cover 5, and the other is towards the base 2. The lubricating oil flowing towards the protective cover 5 is first stored in the oil storage groove B12, and the excess oil will continue to flow to the oil storage groove A11 for storage.

[0053] Furthermore, an oil injection hole 10 penetrating the side wall of the housing 1 is formed on the side wall of the housing 1. The oil injection hole 10 is communicated with the cavity 6 of the housing 1. The oil injection hole 10 has an internal thread and is provided with a plug. The plug is threadedly connected to the oil injection hole 10. After injecting the lubricating oil into the cavity 6 through the oil injection hole 10, the plug is rotated and inserted into the oil injection hole 10 and tightened.

[0054] In this embodiment, referring to Figure 4 and Figure 6 , three positioning shafts are vertically arranged on the lower surface of the bushing 4, and the three positioning shafts are arranged at equal circumferential intervals. At the same time, a locking disc 18 is provided. The locking disc 18 is a cylinder with a sealed bottom surface. Three shaft holes adapted to the three positioning shafts are formed on the bottom surface, and an installation hole is formed on the bottom surface. Screws are inserted to fix it to the bushing 4. The shape of the locking disc 18 is similar to that of the base 2. After the locking disc 18 is inserted into the bottom of the bushing 4, it is then inserted into the base 2 from top to bottom in a matching manner. The locking disc 18 can block the gap between the base 2 and the rotating assembly to prevent the lubricating oil from leaking out of the base 2. And the circumferential gap formed by the stepped table surface on the outer side of the upper surface of the locking disc 18 and the inner side of the cylindrical edge on the upper surface of the base 2 is the oil storage groove C13. The lubricating oil flowing towards the base 2 is stored through the oil storage groove C13.

[0055] In this embodiment, referring to Figure 1 and Figure 2 , an induction detector 19 for detecting the rotation speed of the rotating assembly is inserted into the side wall of the protective cover 5. The probe of the induction detector 19 is inserted into the side wall of the protective cover 5 and contacts the bushing 4. At the same time, induction detectors 19 for detecting the motor frequency and amplitude are symmetrically inserted into the short cylindrical side wall of the housing 1.

[0056] The utility model relates to a spindle head for grinding the surface of a workpiece. When using the spindle head to grind the workpiece, first connect the lower end of the bushing 4 to the motor. Through the motor, the rotating assembly installed in the housing 1 rotates, thereby driving the grinding head 7 at the end of the rotating assembly to rotate and grind on the surface of the workpiece. At the same time, before starting the motor to make the spindle head work, when injecting lubricating oil into the outer cavity 6 through the oil injection hole 10, the cavity 6 is filled with lubricating oil, which plays a role in fully lubricating the rotating assembly. At the same time, when it is necessary to set the grinding head 7 of the rotating assembly downward to align with the workpiece for grinding, the lubricating oil will be divided into two flow directions, namely the protective cover 5 and the base 2. The lubricating oil flowing towards the protective cover 5 is stored when passing through the oil storage groove B12 between the bushing 4 and the housing 1, and the remaining excess oil continues to flow to the oil storage groove A11 to avoid leakage of the lubricating oil due to the high-speed rotation of the rotating assembly; and the lubricating oil flowing towards the base 2 will flow to the oil storage groove C13 above the locking disc 18 for storage.

[0057] Since when the existing tools for grinding the surface of a workpiece rotate the rotating shaft for grinding, friction will occur inside the housing 1 of the rotating shaft, slowing down the rotation speed. Usually, lubricating oil needs to be injected into the interior. However, the tools currently used usually set up oil pipes to lubricate the shaft, but the shaft is not fully lubricated; and when injecting lubricating oil into the tool interior to contact the rotating shaft, the high-speed rotation of the rotating shaft will cause a certain degree of leakage of the internal lubricating oil, which not only wastes the lubricating oil, but also pollutes the workpiece and the surrounding environment; this solution designs a spindle head with a cavity 6 and an oil injection hole 10 penetrating the cavity 6 provided inside the housing 1, which can directly fill the cavity 6 with lubricating oil through the oil injection hole 10 to fully lubricate the rotating assembly; at the same time, to prevent the lubricating oil from leaking from the protective cover 5 and the base 2 when the rotating assembly rotates, an annular groove-shaped oil storage groove A11 is provided between the protective cover 5 on the upper surface of the housing 1, a through-hole-shaped oil storage groove B12 is provided on the side wall of the bushing 4, and an oil storage groove C13 is provided below the cavity 6 and above the base 2 to prevent the flowing lubricating oil from leaking out in two directions from the protective cover 5 and the base 2.

[0058] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A spindle head for grinding the surface of a workpiece, characterized in that: It includes a housing (1), a protective cover (5), a base (2) and a rotating assembly; The housing (1) is cylindrical. A protective cover (5) is provided at the upper end of the housing (1), and a base (2) is provided at the lower end of the housing (1); The housing (1) has a cylindrical cavity (6). Through holes are axially opened in the protective cover (5) and the base (2). The middle part of the rotating assembly is located in the cylindrical cavity (6), and the two are installed in cooperation through bearings. The two ends of the rotating assembly respectively extend out of the protective cover (5) and the base (2) through the corresponding through holes; The end of the rotating assembly extending out of the base (2) is connected to a rotation driving mechanism, and a grinding head (7) is installed at the end of the rotating assembly extending out of the protective cover (5); An oil injection hole (10) that can be opened and closed is opened on the housing (1), and the oil injection hole (10) communicates with the cylindrical cavity (6) of the housing (1); The protective cover (5) and the housing (1) are in surface contact to form an annular sealing surface. An oil storage groove A (11) is opened at the inner diameter of the annular sealing surface, and an annular sealing ring (20) is also provided between the annular sealing surfaces; When the cavity (6) is filled with oil through the oil injection hole (10) and the rotating assembly rotates first under the action of the driving mechanism, the grinding head (7) is driven to grind the workpiece, and the oil on the outer wall of the rotating assembly is thrown into the oil storage groove A (11) for storage, so that the oil will not leak out through the gap between the wall of the through hole of the protective cover (5) and the cylindrical surface of the rotating assembly.

2. The spindle head for workpiece surface grinding according to claim 1, characterized in that: An annular groove is opened at the position where the outer side of the rotating assembly contacts the protective cover (5) and the housing (1). The groove is located inside the oil storage groove A (11), and a second circular cushion block (17) is arranged in the groove to prevent the leakage of oil.

3. The spindle head for workpiece surface grinding according to claim 2, characterized in that: The rotating assembly includes an inner shaft (3) and a shaft sleeve (4); The shaft sleeve (4) is rotatably inserted into the cavity (6) of the housing (1). The lower end of the shaft sleeve (4) is connected to a motor through a locking disc (18). The inner shaft (3) is inserted into the through hole of the shaft sleeve (4) and fixed to the shaft sleeve (4) through a plurality of fixing blocks; A grinding head (7) is provided at the upper end of the inner shaft (3), and an eccentric block (8) is arranged below the grinding head (7).

4. A spindle head for workpiece surface grinding according to claim 3, characterized in that: The lower end of the housing (1) is open. The base (2) is connected to the lower surface of the housing (1) by screws. An installation hole is opened at the center of the base (2). The locking disc (18) is inserted into the installation hole. The end of the shaft sleeve (4) is inserted into the locking disc (18) and the extended end is connected to the motor.

5. The spindle head for workpiece surface grinding according to claim 4, characterized in that: Inside the housing (1), above the cavity (6), an annular groove is opened on the inner wall of the housing (1), and at the same time, an oil storage groove B (12) is opened on the cylindrical side surface of the opposite shaft sleeve (4); The lubricating oil flowing towards the protective cover (5) is first stored in the oil storage groove B (12), and the excess oil continues to flow to the oil storage groove A (11) for storage.

6. The spindle head for workpiece surface grinding according to claim 4, wherein: The locking disc (18) is fixed through the lower end of the shaft sleeve (4) and inserted into the base (2). A circumferential gap is formed between the upper surface of the locking disc (18) and the inner side of the cylinder above the base (2) as the oil storage groove C (13), and the lubricating oil flowing towards the base (2) is stored in the oil storage groove C (13).

7. The spindle head for workpiece surface grinding according to claim 3, wherein: In the cavity (6), a ball bearing A (14), a ball bearing B (15), and a ball bearing C (16) are sequentially installed at certain intervals from top to bottom on the outer periphery of the bushing (4), and first circular ring pads (9) are provided on the outer periphery of the bushing (4) between the ball bearing A (14) and the ball bearing B (15), and between the ball bearing B (15) and the ball bearing C (16).

Images