A CNC center hole seat surface grinder for fuel injection nozzle machining

Abstract

The present invention relates to the technical field of polishing machine tools, and discloses a CNC center hole seat surface grinder for processing fuel injector nozzles, comprising a frame, a support seat is provided at one end of the frame, and a three-jaw chuck is provided on the support seat, a grinding head seat is provided on the frame, and a fixed seat is slidably provided on the grinding head seat, a first drive motor is provided on the fixed seat, and a grinding head assembly is provided on the output shaft of the first drive motor, the grinding head assembly comprises a fixed rod, a cavity is provided inside the fixed rod, and one end of the fixed rod is fixedly connected to the output shaft of the first drive motor, and a grinding plate fixing seat is provided at one end of the fixed rod. The present application can complete the processing of two grinding surfaces of different specifications, the center hole and the seat surface of the needle valve body, without replacing the grinding head, by providing a fixed rod with a third grinding plate and a fourth grinding plate, thereby greatly improving the grinding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of polishing machine tools, in particular to a numerically controlled center hole seat surface grinder for processing oil injection nozzles. Background Art

[0002] The center hole seat surface grinder is a machine tool specially used for machining high-precision center holes and seat surfaces. It is widely used in the high-pressure common rail industry, especially in the machining of fuel injector parts. The matching clearance between the needle valve body and the needle valve neck of the fuel injector part is very small, and the precision requirement is extremely high, usually within 0.5μm. The machining accuracy of the center hole seat surface grinder is a comprehensive reflection of various factors of the machine tool, including chuck accuracy, high-speed grinding head accuracy, guide rail accuracy, positioning accuracy, etc. The center hole seat surface of the needle valve body is actually two structures. The center hole is used to connect the oil outlet hole, and the seat surface is conical and located at the tail of the center hole. It is generally used to connect the oil inlet pipe.

[0003] Since the grinding accuracy of the center hole seat surface of the needle valve body is relatively high and the specifications of the center hole and the seat surface are different, it is difficult to achieve the grinding requirements using one grinding head. Therefore, during the entire grinding process, it is necessary to use grinding heads of various specifications to perform rough and fine grinding on the center hole seat surface of the needle valve body. Conventional grinders are generally only equipped with one grinding motor. Therefore, the grinding head needs to be replaced frequently during the processing, and the processing efficiency is low. Although there are grinders with multiple grinding motors on the market, the cost of using such grinders is significantly increased, which makes many small manufacturers discouraged. Therefore, it is necessary to improve a low-cost and high-efficiency injection nozzle center hole seat grinder to solve the above problems. Summary of the invention

[0004] The present invention provides a CNC center hole seat surface grinder for fuel injector nozzle processing, which has the beneficial effect of high processing effect and solves the problem that the conventional grinder mentioned in the above background technology is generally equipped with only one grinding motor, so the grinding head needs to be frequently replaced during the processing, resulting in low processing efficiency.

[0005] The present invention provides the following technical solution: a CNC center hole seat surface grinder for processing a fuel injector nozzle, comprising a frame, a support seat is provided at one end of the frame, a three-jaw chuck is provided on the support seat, a grinding head seat is provided on the frame, a fixed seat is slidably provided on the grinding head seat, a first drive motor is provided on the fixed seat, and a grinding head assembly is provided on the output shaft of the first drive motor;

[0006] The grinding head assembly includes a fixed rod, a cavity is provided inside the fixed rod, and one end of the fixed rod is fixedly connected to the output shaft of the first driving motor, and one end of the fixed rod is provided with a grinding plate fixing seat, the grinding plate fixing seat is cylindrical, and a plurality of first grinding plates are provided on the grinding plate fixing seat, the first grinding plates are equidistantly arranged on the grinding plate fixing seat, and a fixed groove is provided at the gap of the first grinding plates, and a second grinding plate is movably provided in the fixed groove.

[0007] As an optional solution of the CNC center hole seat grinder for fuel injector processing described in the present invention, the second grinding plate is provided with an extension block at one end close to the fixed rod, and the second grinding plate is elastically connected to the grinding plate fixing seat through a first rebound spring, and the extension block is triangular in shape.

[0008] As an optional solution of the CNC center hole seat grinder for fuel injector processing described in the present invention, an adjustment component for adjusting the second grinding plate is provided in the grinding plate fixing seat, and the adjustment component includes an adjustment ring, the adjustment ring is in contact with the extension block, and the adjustment ring is elastically connected to the grinding plate fixing seat through a first limit spring.

[0009] As an optional solution of the CNC center hole seat grinder for fuel injector processing described in the present invention, an adjustment plate is provided at one end of the grinding plate fixing seat close to the fixing rod, and the adjustment plate is rotatably connected to the grinding plate fixing seat, a first transmission rod is provided at one end of the adjustment plate, the first transmission rod is L-shaped, and one end of the first transmission rod is in conflict with the adjustment plate, and the other end of the first transmission rod is fixedly connected to the adjustment ring.

[0010] As an optional solution of the CNC center hole seat grinder for fuel injector processing described in the present invention, wherein: a sleeve is provided at one end of the fixed rod close to the first drive motor, a first water inlet is provided on the sleeve, and the sleeve is rotatably connected to the fixed rod through a bearing, and a second water inlet connected to the cavity is opened on the fixed rod.

[0011] As an optional solution of the CNC center hole seat grinder for fuel injector nozzle processing described in the present invention, a third grinding plate is provided on one side of the fixed rod, and a storage seat is provided on the other side of the fixed rod, a movable fourth grinding plate is provided in the storage seat, and the fourth grinding plate is elastically connected to the storage seat through a second rebound spring.

[0012] As an optional solution of the CNC center hole seat grinder for fuel injector processing described in the present invention, a second transmission rod and a piston are provided in the cavity, the piston is elastically connected to the fixed rod through a second limit spring, and a through hole is provided on the piston, one end of the second transmission rod passes through the piston and contacts the adjustment plate, and a guide block is provided at the other end of the second transmission rod, and the guide block contacts the fourth grinding plate.

[0013] As an optional solution of the CNC center hole seat grinder for fuel injector processing described in the present invention, wherein: a fixed shaft is provided in the support seat, the fixed shaft is rotatably connected to the support seat, and one end of the fixed shaft is fixedly connected to the three-jaw chuck, and the other end of the fixed shaft is provided with a pulley, a second drive motor is provided in the frame, and the second drive motor is transmission-connected to the fixed shaft through a belt.

[0014] As an optional solution of the CNC center hole seat grinder for fuel injector processing described in the present invention, the grinding head seat is slidably connected to the frame via a slide rail, the frame is provided with a driving unit for driving the grinding head seat to slide, and the driving unit includes a first servo motor and a transmission screw, the transmission screw is rotatably connected to the frame, and the transmission screw is transmission-connected to the grinding head seat via a screw nut, the first servo motor is fixedly connected to the frame, and the output shaft of the first servo motor is fixedly connected to the transmission screw.

[0015] As an optional solution of the CNC center hole seat grinder for fuel injector nozzle processing described in the present invention, the fixed seat is slidably connected to the grinding head seat through a slide groove, and a rack is provided on the fixed seat, and a second servo motor is provided on the grinding head seat, and the second servo motor is transmission-connected to the rack through a gear.

[0016] The present invention has the following beneficial effects:

[0017] 1. A CNC center hole seat surface grinder for processing fuel injector nozzles can complete the fine grinding and coarse grinding of the center hole of a needle valve body without adjusting the workstation and replacing the grinding head by setting a grinding head assembly with different grinding sheets. Specifically, when in use, the workpiece to be processed is fixed on a three-jaw chuck, and then the position of the grinding head assembly is adjusted. During the processing, the three-jaw chuck rotates with the workpiece, and the first driving motor rotates with the fixed rod and the grinding sheet fixing seat. When rough grinding is performed, the center hole axis of the processed workpiece is in an eccentric state with the fixed rod, and the rotating workpiece is grinded by the first grinding sheet on the grinding sheet fixing seat. When fine grinding is performed, the center hole axis of the processed workpiece is first adjusted to be aligned with the axis of the fixed rod, and then the second grinding sheet is adjusted out by the adjusting assembly, and then the inner wall of the center hole is finely ground by the second grinding sheet, thereby greatly improving the grinding efficiency.

[0018] 2. A CNC center-hole seat surface grinder for processing a fuel injector nozzle is provided with a fixed rod with a sleeve. When in use, the cutting fluid can enter the fixed rod through the sleeve. A second transmission rod and a piston are provided in the cavity. A through hole is opened on the piston for the cutting fluid to pass through. The purpose of adjusting the adjustment component and the second grinding plate can be achieved by controlling the flow rate of the cutting fluid. Specifically, when the inflow pressure of the cutting fluid is small, the piston remains stationary. When the inflow pressure of the cutting fluid becomes larger, the cutting fluid in the cavity cannot flow away through the through hole in time, so that the pressure on the side of the piston close to the second water inlet becomes larger. Under the push of the cutting fluid, the piston overcomes the resistance of the second limit spring and moves. Driven by the piston, the second transmission rod conflicts with the adjustment plate, thereby causing the adjustment plate to deflect, which can achieve the purpose of adjusting the second grinding plate. The present application utilizes the pressure of the cutting fluid to adjust the position of the second grinding plate. During the processing, the position of the second grinding plate can be adjusted anytime and anywhere, and the use is more flexible.

[0019] 3. A CNC center hole seat surface grinder for processing a fuel injection nozzle is provided with a third grinding disc and a fourth grinding disc. The fourth grinding disc can be used for fine grinding of the seat surface, and the third grinding disc can be used for rough grinding of the seat surface. Under normal circumstances, the length of the fourth grinding disc is smaller than that of the third grinding disc. When rough grinding is performed, the seat surface of the needle valve body and the grinding disc fixing seat are in an eccentric state. When fine grinding is performed, the seat surface of the needle valve body and the grinding disc fixing seat are in a coaxial state. A guide block is provided on the second transmission rod. The guide block is triangular in shape. When the flow rate of the cutting fluid increases, it can promote The piston moves with the second transmission rod. As the second transmission rod moves, the guide block collides with the fourth grinding plate. Pushed by the guide block, the fourth grinding plate moves toward the outside of the storage seat until its outward length is greater than the third grinding plate. Subsequently, the fourth grinding plate is driven by the grinding plate fixing seat to process the needle valve body. By setting a fixing rod with the third and fourth grinding plates, the present application can complete the processing of two grinding surfaces of different specifications, the center hole and the seat surface of the needle valve body, without replacing the grinding head, thereby greatly improving the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a side view of the present invention.

[0022] Figure 3 It is a schematic diagram of the internal structure of the fixing rod and the grinding plate fixing seat of the present invention.

[0023] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure in the middle.

[0024] Figure 5 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B in the middle.

[0025] Figure 6 It is a schematic diagram of the structure of the grinding head assembly of the present invention.

[0026] Figure 7 It is a schematic diagram of the internal structure of the support base of the present invention.

[0027] In the figure: 1, frame; 2, support seat; 3, three-jaw chuck; 4, grinding head seat; 5, fixed seat; 6, first drive motor; 7, fixed rod; 701, cavity; 702, second water inlet; 703, second transmission rod; 704, piston; 705, through hole; 706, second limit spring; 707, guide block; 8, grinding plate fixed seat; 801, first grinding plate; 802, fixed groove; 803, second grinding plate; 804, extension block; 805, first Rebound spring; 806, adjustment ring; 807, first limit spring; 9, adjustment plate; 10, first transmission rod; 11, bushing; 12, first water inlet; 13, third grinding disc; 14, storage seat; 15, fourth grinding disc; 16, second rebound spring; 17, fixed shaft; 18, pulley; 19, second drive motor; 20, slide rail; 21, first servo motor; 22, transmission screw; 23, slide groove; 24, rack; 25, second servo motor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] For example, see Figures 1 to 7 The present invention provides a CNC center hole seat surface grinder for processing a fuel injection nozzle, comprising a frame 1, a support seat 2 is provided at one end of the frame 1, and a three-jaw chuck 3 is provided on the support seat 2, a grinding head seat 4 is provided on the frame 1, and a fixed seat 5 is slidably provided on the grinding head seat 4, a first driving motor 6 is provided on the fixed seat 5, and a grinding head assembly is provided on the output shaft of the first driving motor 6;

[0030] The grinding head assembly includes a fixed rod 7, a cavity 701 is provided inside the fixed rod 7, and one end of the fixed rod 7 is fixedly connected to the output shaft of the first drive motor 6, and one end of the fixed rod 7 is provided with a grinding plate fixing seat 8, the grinding plate fixing seat 8 is cylindrical, and a plurality of first grinding plates 801 are provided on the grinding plate fixing seat 8, the first grinding plates 801 are equidistantly arranged on the grinding plate fixing seat 8, and a fixed groove 802 is provided at the gap of the first grinding plates 801, and a second grinding plate 803 is movably provided in the fixed groove 802.

[0031] An extension block 804 is provided at one end of the second grinding plate 803 close to the fixing rod 7 , and the second grinding plate 803 is elastically connected to the grinding plate fixing seat 8 via a first rebound spring 805 , and the extension block 804 is triangular in shape.

[0032] The grinding plate fixing seat 8 is provided with a first grinding plate 801 and a second grinding plate 803. The first grinding plate 801 is detachably connected to the grinding plate fixing seat 8 by bolts. The position of the second grinding plate 803 on the grinding plate fixing seat 8 is adjustable. The abrasive grain sizes of the first grinding plate 801 and the second grinding plate 803 are different.

[0033] The present application provides a grinding head assembly with different grinding sheets, so that the fine grinding and coarse grinding of the center hole of the needle valve body can be completed without adjusting the work position and replacing the grinding head. Specifically, when in use, the workpiece to be processed is fixed on the three-jaw chuck 3, and then the position of the grinding head assembly is adjusted. During the processing, the three-jaw chuck 3 rotates with the workpiece, and the first drive motor 6 rotates with the fixed rod 7 and the grinding sheet fixing seat 8. When rough grinding is performed, the center hole axis of the workpiece is in an eccentric state with the fixed rod 7, and the rotating workpiece is polished by the first grinding sheet 801 on the grinding sheet fixing seat 8. When fine grinding is performed, the center hole axis of the workpiece is first adjusted to be consistent with the axis of the fixed rod 7, and then the second grinding sheet 803 is adjusted out by the adjusting assembly, and then the inner wall of the center hole is finely ground by the second grinding sheet 803, thereby greatly improving the grinding efficiency.

[0034] Example 2: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 7 An adjusting component for adjusting the second grinding plate 803 is provided in the grinding plate fixing seat 8, and the adjusting component includes an adjusting ring 806, the adjusting ring 806 abuts against the extension block 804, and the adjusting ring 806 is elastically connected to the grinding plate fixing seat 8 through a first limit spring 807.

[0035] An adjustment plate 9 is provided at one end of the grinding plate fixing seat 8 close to the fixing rod 7, and the adjustment plate 9 is rotatably connected to the grinding plate fixing seat 8. A first transmission rod 10 is provided at one end of the adjustment plate 9. The first transmission rod 10 is L-shaped, and one end of the first transmission rod 10 is in contact with the adjustment plate 9, and the other end of the first transmission rod 10 is fixedly connected to the adjustment ring 806.

[0036] The adjusting assembly includes an adjusting ring 806 that can slide in the grinding plate fixing seat 8. The adjusting ring 806 is elastically connected to the grinding plate fixing seat 8 through a first limit spring 807. Correspondingly, an adjusting plate 9 and a first transmission rod 10 are also provided in the grinding plate fixing seat 8. The adjusting plate 9 is rotatably connected to the grinding plate fixing seat 8 in an eccentric state, which is equivalent to a lever. When in use, it is only necessary to push the adjusting plate 9, and the adjusting plate 9 deflects. Driven by the adjusting plate 9, the first transmission rod 10 moves the adjusting ring 806 in the direction close to the fixing rod 7. With the movement of the adjusting ring 806, the extension block 804 no longer conflicts with the adjusting ring 806, and the extension block 804 is triangular. After losing the restriction of the adjusting ring 806, the second grinding plate 803 extends out from the fixing groove 802 under the push of the first rebound spring 805. At this time, the extending length of the second grinding plate 803 is greater than the first grinding plate 801, so that the grinding plate fixing seat 8 can finely grind the hole in the needle valve body through the second grinding plate 803 during the rotation process.

[0037] Example 3: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 7 A third grinding plate 13 is provided on one side of the fixed rod 7, and a storage seat 14 is provided on the other side of the fixed rod 7. A movable fourth grinding plate 15 is provided in the storage seat 14, and the fourth grinding plate 15 is elastically connected to the storage seat 14 through a second rebound spring 16.

[0038] A second transmission rod 703 and a piston 704 are provided in the cavity 701. The piston 704 is elastically connected to the fixed rod 7 via a second limit spring 706, and a through hole 705 is provided on the piston 704. The second transmission rod 703 is fixedly connected to the piston 704. One end of the second transmission rod 703 passes through the piston 704 and contacts the adjustment plate 9. A guide block 707 is provided at the other end of the second transmission rod 703, and the guide block 707 contacts the fourth grinding plate 15.

[0039] A sleeve 11 is provided at one end of the fixing rod 7 close to the first driving motor 6 , and a first water inlet 12 is provided on the sleeve 11 . The sleeve 11 is rotatably connected to the fixing rod 7 via a bearing, and a second water inlet 702 communicating with the cavity 701 is provided on the fixing rod 7 .

[0040] During the grinding process, it is necessary to transport cutting fluid into the workpiece. The cutting fluid has a cooling effect on the one hand, and can take away the cutting debris on the other hand, which is more conducive to processing. In the present technical solution, a cavity 701 is provided in the fixed rod 7, and a second water inlet 702 connected with the cavity 701 is provided on the fixed rod 7. A sleeve 11 is provided on the outer side of the fixed rod 7. The sleeve 11 is rotatably connected to the fixed rod 7 through a sealing bearing, which has a good sealing effect. When in use, the sleeve 11 is fixed, and the cutting fluid enters the gap between the sleeve 11 and the fixed rod 7 through the first water inlet 12 provided on the sleeve 11, and then enters the cavity 701 through the second water inlet 702, and then enters the grinding disc fixing seat 8 through the cavity 701, and a hole is opened on the grinding disc fixing seat 8, and finally the cutting fluid is discharged. The cutting fluid flows out through the opening on the grinding disc fixing seat 8. A second transmission rod 703 and a piston 704 are provided in the cavity 701. A through hole 705 is provided on the piston 704 for the cutting fluid to pass through. Under normal circumstances, if the inflow pressure of the cutting fluid is small, the piston 704 remains stationary. If the inflow pressure of the cutting fluid increases, the cutting fluid in the cavity 701 cannot flow out through the through hole 705 in time, so that the pressure on the side of the piston 704 close to the second water inlet 702 increases. Pushed by the cutting fluid, the piston 704 overcomes the resistance of the second limit spring 706 and moves. Driven by the piston 704, the second transmission rod 703 conflicts with the adjustment plate 9, thereby causing the adjustment plate 9 to deflect, which can achieve the purpose of adjusting the second grinding disc 803.

[0041] The present application sets a fixed rod with a second transmission rod 703 and a piston 704, and uses the pressure of the cutting fluid to adjust the position of the second grinding plate 803. During the processing, the position of the second grinding plate 803 can be adjusted anytime and anywhere, which is more flexible to use.

[0042] In order to better process the center hole seat surface of the needle valve body, the present application also sets a third grinding sheet 13 and a fourth grinding sheet 15 on the fixed rod. The fourth grinding sheet 15 is used to fine-grind the seat surface, and the third grinding sheet 13 is used to coarse-grind the seat surface. Under normal circumstances, the length of the fourth grinding sheet 15 is smaller than that of the third grinding sheet 13, and the use of the first grinding sheet 801 and the second grinding sheet 803 is similar. When coarse grinding is performed, the seat surface of the needle valve body and the grinding sheet fixing seat 8 are in an eccentric state. When fine grinding is performed, the seat surface of the needle valve body and the grinding sheet fixing seat 8 are in a coaxial state. In the center state, a guide block 707 is provided on the second transmission rod 703, and the guide block 707 is triangular in shape. When the flow rate of the cutting fluid increases, the piston 704 can be prompted to move with the second transmission rod 703. As the second transmission rod 703 moves, the guide block 707 conflicts with the fourth grinding sheet 15. Under the push of the guide block 707, the fourth grinding sheet 15 moves toward the outside of the storage seat 14 until its outward length is greater than the third grinding sheet 13. Subsequently, the fourth grinding sheet 15 is driven by the grinding sheet fixing seat 8 to process the needle valve body. The adjustment is simple and the use is convenient.

[0043] Example 4: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 7 A fixed shaft 17 is provided in the support seat 2, the fixed shaft 17 is rotatably connected to the support seat 2, and one end of the fixed shaft 17 is fixedly connected to the three-jaw chuck 3, and the other end of the fixed shaft 17 is provided with a pulley 18. A second drive motor 19 is provided in the frame 1, and the second drive motor 19 is transmission-connected to the fixed shaft 17 through a belt.

[0044] The grinding head seat 4 is slidably connected to the frame 1 through a slide rail 20. The frame 1 is provided with a driving unit for driving the grinding head seat 4 to slide, and the driving unit includes a first servo motor 21 and a transmission screw 22. The transmission screw 22 is rotationally connected to the frame 1, and the transmission screw 22 is transmission-connected to the grinding head seat 4 through a screw nut. The first servo motor 21 is fixedly connected to the frame 1, and the output shaft of the first servo motor 21 is fixedly connected to the transmission screw 22.

[0045] The fixed seat 5 is slidably connected to the grinding head seat 4 through the slide groove 23, and a rack 24 is provided on the fixed seat 5. The grinding head seat 4 is provided with a second servo motor 25, and the second servo motor 25 is transmission-connected to the rack 24 through a gear.

[0046] The first servo motor 21 can drive the transmission screw 22 to rotate, and the grinding head seat 4 can slide along the slide rail 20 under the drive of the transmission screw 22. The second servo motor 25 can drive the rack 24 to translate, and the fixed seat 5 can move along the slide groove 23 under the drive of the rack 24.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A CNC center hole seat surface grinding machine for processing a fuel injection nozzle, comprising a frame (1), characterized in that: A support seat (2) is provided at one end of the frame (1), and a three-jaw chuck (3) is provided on the support seat (2); a grinding head seat (4) is provided on the frame (1), and a fixed seat (5) is slidably provided on the grinding head seat (4); a first drive motor (6) is provided on the fixed seat (5), and a grinding head assembly is provided on the output shaft of the first drive motor (6); The grinding head assembly comprises a fixing rod (7), a cavity (701) is provided inside the fixing rod (7), one end of the fixing rod (7) is fixedly connected to the output shaft of the first driving motor (6), one end of the fixing rod (7) is provided with a grinding plate fixing seat (8), the grinding plate fixing seat (8) is cylindrical, and a plurality of first grinding plates (801) are provided on the grinding plate fixing seat (8), the first grinding plates (801) are equidistantly arranged on the grinding plate fixing seat (8), and the gaps between the first grinding plates (801) are A fixing groove (802) is provided at the fixing groove (802), and a second grinding sheet (803) is movably provided in the fixing groove (802); an extension block (804) is provided at one end of the second grinding sheet (803) close to the fixing rod (7), and the second grinding sheet (803) is elastically connected to the grinding sheet fixing seat (8) via a first rebound spring (805), and the extension block (804) is triangular in shape; an adjustment component for adjusting the second grinding sheet (803) is provided in the grinding sheet fixing seat (8), and the adjustment component includes The adjusting ring (806) is in contact with the extension block (804), and the adjusting ring (806) is elastically connected to the grinding plate fixing seat (8) via a first limit spring (807); an adjusting plate (9) is provided at one end of the grinding plate fixing seat (8) close to the fixing rod (7), and the adjusting plate (9) is rotatably connected to the grinding plate fixing seat (8); a first transmission rod (10) is provided at one end of the adjusting plate (9), and the first transmission rod (10) is L-shaped, and the first transmission rod One end of the first transmission rod (10) contacts the adjustment plate (9), and the other end of the first transmission rod (10) is fixedly connected to the adjustment ring (806); a second transmission rod (703) and a piston (704) are provided in the cavity (701); the piston (704) is elastically connected to the fixed rod (7) via a second limit spring (706), and a through hole (705) is provided on the piston (704); one end of the second transmission rod (703) passes through the piston (704) and contacts the adjustment plate (9).

2. The CNC center hole seat surface grinder for fuel injection nozzle machining according to claim 1, characterized in that: A shaft sleeve (11) is provided at one end of the fixing rod (7) close to the first drive motor (6); a first water inlet (12) is provided on the shaft sleeve (11); the shaft sleeve (11) is rotatably connected to the fixing rod (7) via a bearing; and a second water inlet (702) communicating with the cavity (701) is provided on the fixing rod (7).

3. The CNC center hole seat surface grinder for fuel injection nozzle machining according to claim 2, characterized in that: A third grinding sheet (13) is provided on one side of the fixed rod (7), and a storage seat (14) is provided on the other side of the fixed rod (7). A movable fourth grinding sheet (15) is provided in the storage seat (14), and the fourth grinding sheet (15) is elastically connected to the storage seat (14) via a second rebound spring (16).

4. The CNC center hole seat surface grinding machine for fuel injection nozzle machining according to claim 3 is characterized in that: The other end of the second transmission rod (703) is provided with a guide block (707), and the guide block (707) is in contact with the fourth grinding plate (15).

5. The CNC center hole seat surface grinding machine for fuel injection nozzle machining according to claim 1, characterized in that: A fixed shaft (17) is provided in the support seat (2), the fixed shaft (17) is rotatably connected to the support seat (2), one end of the fixed shaft (17) is fixedly connected to the three-jaw chuck (3), the other end of the fixed shaft (17) is provided with a pulley (18), and a second drive motor (19) is provided in the frame (1), and the second drive motor (19) is transmission-connected to the fixed shaft (17) via a belt.

6. The CNC center hole seat surface grinder for fuel injection nozzle machining according to claim 1, characterized in that: The grinding head seat (4) is slidably connected to the frame (1) via a slide rail (20); a driving unit for driving the grinding head seat (4) to slide is provided on the frame (1); the driving unit comprises a first servo motor (21) and a transmission screw (22); the transmission screw (22) is rotationally connected to the frame (1), and the transmission screw (22) is transmission-connected to the grinding head seat (4) via a screw nut; the first servo motor (21) is fixedly connected to the frame (1), and an output shaft of the first servo motor (21) is fixedly connected to the transmission screw (22).

7. The CNC center hole seat surface grinder for fuel injection nozzle machining according to claim 1, characterized in that: The fixed seat (5) is slidably connected to the grinding head seat (4) via a sliding groove (23), and a rack (24) is provided on the fixed seat (5). A second servo motor (25) is provided on the grinding head seat (4), and the second servo motor (25) is transmission-connected to the rack (24) via a gear.

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