A special center frame device for deep hole drilling machine about small hole processing

Abstract

The application discloses a special center frame device for a deep hole drilling machine for small hole processing and relates to the technical field of machining equipment.The application comprises a base, the base is composed of a bottom plate and two groups of C-shaped clamping blocks, the two groups of C-shaped clamping blocks are fixedly installed at the two ends of the bottom of the bottom plate through bolts, a clamping threaded hole is formed in the top of the C-shaped clamping block, the C-shaped clamping block can be fixedly installed outside the machine tool guide rail through the bolt screwed into the clamping threaded hole, and a support assembly is fixedly installed on the top of the bottom plate through bolts.The C-shaped clamping block can be installed at any position of the machine tool guide rail, the high straightness and good parallelism of the machine tool guide rail can be utilized, the support assembly can be quickly and high-precisely installed, the machining of slender shaft workpieces with different lengths can be implemented, the C-shaped clamping block can be quickly removed when not needed, the C-shaped clamping block is convenient to use, the C-shaped clamping block structure can be stably clamped on machine tool guide rails with different specifications, and the application range is wide.

Description

Technical Field

[0001] This invention relates to the field of machining equipment technology, specifically to a center support device for deep hole drilling machines used for small hole machining. Background Technology

[0002] Deep hole machining is an important process in modern machining, widely used in aerospace, automotive, mold making, oil drilling and other fields. Deep hole machining not only requires a small diameter borehole, but also places high demands on the depth of the hole and the smoothness of the hole wall.

[0003] In the field of traditional small-hole and deep-hole machining, especially for precision slender shaft parts, traditional small-hole and deep-hole machining machines are generally equipped with a center rest to adjust the straightness of slender shaft parts with poor straightness. However, for slender shafts with a length generally exceeding 2 meters, the single center rest provided by the machine is insufficient to adjust the overall straightness of the workpiece (in actual measurements, one center rest can guarantee the straightness of the workpiece within a 500mm range), and therefore cannot guarantee the coaxiality between the straight outer circle and the inner hole of the workpiece. If multiple center rests are requested from the equipment manufacturer during the ordering stage, the adjustment needs of longer workpieces can be met. However, the center rests on the manufacturer's sets slide on guide rails, and once installed, they cannot be removed by the machine itself, and it is difficult to reinstall them after forced removal. The center rest installed by the manufacturer occupies 320mm of guide rail space, which requires the workpiece length to be less than 320mm, otherwise machining is impossible. If multiple center rests are added to the machine, the required workpiece length will increase, significantly reducing the utilization rate of the equipment.

[0004] Therefore, in order to address the aforementioned technical problems, it is necessary to provide a novel center frame device. Summary of the Invention

[0005] The purpose of this invention is to solve the above problems by providing a special center rest device for deep hole drilling machines for small hole machining.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] A special center support device for deep hole drilling machine for small hole machining includes a base, which consists of a base plate and two sets of C-shaped clamping blocks. The two sets of C-shaped clamping blocks are fixedly installed at both ends of the bottom of the base plate by bolts. The top of the C-shaped clamping blocks is provided with clamping threaded holes. The C-shaped clamping blocks can be fixedly installed on the outside of the machine tool guide rail by bolts screwed into the clamping threaded holes. A bracket assembly is fixedly installed on the top of the base plate by bolts.

[0008] The C-shaped clamping block consists of an L-plate, an adjusting block, two sets of first clamping plates, and two sets of second clamping plates. The L-plate is fixedly installed at the bottom of the base plate. The lower half of the L-plate has a guide sliding hole, and the adjusting block can slide along the guide sliding hole. The top and bottom of the adjusting block have sliding openings, and the first clamping plates can slide along the sliding openings and be locked in the sliding openings. The two sets of first clamping plates can swing synchronously in opposite directions. A top spring is provided between the two sets of first clamping plates and the adjusting block. The end of the first clamping plate away from the adjusting block has a storage swing groove. The second clamping plate is rotatably installed in the storage swing groove. A clamping connecting rod is hinged to the side of the second clamping plate near the adjusting block, and the other end of the clamping connecting rod is hinged to the adjusting block.

[0009] Furthermore, the C-shaped clamp is configured as a C-shaped fixing block and matches the specifications of the guide rail.

[0010] Furthermore, the bracket assembly consists of a bracket and an upper pressure cover forming a support part. Both the upper pressure cover and the bracket have through-holes for clamping sliding holes. A lead screw is rotatably installed inside the clamping sliding hole. The bracket has two sets of lead screws, which are circumferentially distributed at equal intervals with the lead screw in the upper pressure cover. One end of the lead screw near the center of the bracket assembly is threaded to a top block, and the other end is provided with a lead screw knob. The top block is slidably connected in the clamping sliding hole. Both the upper pressure cover and the bracket have locking knobs threaded to their front sides. The locking knobs can lock the top block. The top block is made of C12MoV alloy tool steel with a hardness of HRC58-62.

[0011] Furthermore, a first connecting shaft is provided at the bottom left side of the upper cover, and the first connecting shaft is rotatably mounted on the top left side of the bracket. A second connecting shaft is rotatably mounted on the top right side of the bracket. A screw is provided at the top of the second connecting shaft, and a clamping nut is threadedly connected to the top of the screw. A locking groove is provided at the bottom right side of the upper cover. After the screw swings into the locking groove, the clamping nut is screwed down to press the upper cover onto the bracket.

[0012] Furthermore, screws are threaded onto the outer side of each clamping sliding hole, and annular grooves are provided on the lead screw corresponding to the screw positions.

[0013] Furthermore, a drive shaft hole is provided through the outer side of the lead screw.

[0014] Furthermore, the lower half of the L-plate is provided with an adjusting threaded hole, and a guide slider is provided on the outer side of the adjusting block. The guide slider is slidably connected in the guide sliding hole. An adjusting bolt is rotatably installed on the outer side of the adjusting block. The adjusting bolt is threadedly connected in the adjusting threaded hole. A pin is provided inside the sliding opening. Pin rollers are provided on both sides of the first clamping plate. Several pin holes are circumferentially opened on the outer side of the pin rollers. The pin rod can pass through the pin holes. The pin rollers on the two sets of the first clamping plates are slidably connected in the upper and lower sets of sliding openings, respectively.

[0015] Furthermore, a connecting plate is provided on the outer side of the adjusting block, and both sets of the first clamping plates are rotatably mounted on the connecting plate. The top spring is fixedly connected to the connecting plate. Two sets of gear one and two sets of gear two are rotatably mounted on the outer side of the connecting plate. The two sets of gear one are fixedly connected to the pin rollers on the two sets of the first clamping plates respectively. The two sets of gear two are arranged between the two sets of gear one, and the two sets of gear one and the two sets of gear two mesh with each other on the same vertical line.

[0016] Furthermore, the end of the first clamping plate away from the adjusting block is designed with an arc, and the outer surface is provided with ball bearings, and the rotation center of the second clamping plate coincides with the center of the arc.

[0017] Furthermore, the storage groove in the lower first clamping plate is larger than the storage groove in the upper first clamping plate. When the upper second clamping plate is pressed tightly into the upper storage groove, the two sets of first clamping plates form a V shape.

[0018] The beneficial effects of this invention are as follows:

[0019] This invention, through the setting of C-shaped clamps, can be installed at any position on the machine tool guide rail. Utilizing the extremely high straightness and good parallelism of the machine tool guide rail itself, the bracket assembly can be installed quickly and with high precision. It is suitable for processing slender shaft workpieces of different lengths and can be quickly disassembled when not needed, making it convenient to use.

[0020] The present invention, through the setting of the bracket assembly, can effectively adjust the straightness of slender shaft workpieces, improve the coaxiality of the outer circle and inner hole of slender shaft parts, and achieve good clamping effect.

[0021] This invention features a C-shaped clamping block structure, which can stably clamp onto machine tool guideways of different specifications, making it widely applicable. Furthermore, when adjusting the position, the C-shaped clamping block can form a slider that adapts to the guideway, resulting in high position adjustment efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0023] Figure 2 This is a schematic diagram of the support assembly structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the base structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the C-shaped clamping block holding guide rail in Embodiment 1 of the present invention;

[0026] Figure 5 This is a schematic diagram of the C-shaped clamping block structure in Embodiment 1 of the present invention;

[0027] Figure 6 This is an exploded structural diagram of the C-type clamping block in Embodiment 1 of the present invention;

[0028] Figure 7 This is a schematic diagram of the adjusting block structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the first clamping plate structure of the present invention.

[0030] Reference numerals: 1. Base; 11. Base plate; 12. C-shaped clamping block; 121. L-plate; 13. Clamping threaded hole; 14. Guide sliding hole; 15. Adjusting threaded hole; 16. Adjusting block; 161. Adjusting bolt; 162. Guide slider; 163. Sliding mouth; 164. Pin rod; 165. Top spring; 17. First clamping plate; 171. Pin roller; 172. Pin hole; 173. Storage swing groove; 174. Ball bearing; 18. Connecting plate; 181. Gear one; 182. Gear two; 19. Second clamping plate; 191. Clamping connecting rod; 2. Support assembly; 21. Upper pressure cover; 211. Lead screw knob; 212. Lead screw; 213. Screw; 214. Top block; 215. First connecting shaft; 22. Support; 221. Second connecting shaft; 222. Locking knob; 223. Compression nut. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Example 1, as Figures 1-8 As shown, a special center frame device for deep hole drilling machine tool for small hole machining includes a base 1. The base 1 consists of a base plate 11 and two sets of C-shaped clamping blocks 12. The two sets of C-shaped clamping blocks 12 are fixedly installed at both ends of the bottom of the base plate 11 by bolts. The top of the C-shaped clamping blocks 12 is provided with clamping threaded holes 13. The C-shaped clamping blocks 12 can be fixedly installed on the outside of the machine tool guide rail by bolts screwed into the clamping threaded holes 13. The top of the base plate 11 is fixedly installed with a bracket assembly 2 by bolts.

[0033] The C-type clamping block 12 consists of an L-plate 121, an adjusting block 16, two sets of first clamping plates 17, and two sets of second clamping plates 19. The L-plate 121 is fixedly installed at the bottom of the base plate 11. The lower half of the L-plate 121 has a guide sliding hole 14. The adjusting block 16 can slide along the guide sliding hole 14. The top and bottom of the adjusting block 16 both have sliding openings 163. The first clamping plates 17 can slide along the sliding openings 163 and can be locked in the sliding openings 163. The two sets of first clamping plates 17 can swing synchronously in opposite directions. A top spring 165 is provided between the two sets of first clamping plates 17 and the adjusting block 16. The end of the first clamping plate 17 away from the adjusting block 16 has a storage swing groove 173. The second clamping plate 19 is rotatably installed in the storage swing groove 173. The side of the second clamping plate 19 closest to the adjusting block 16 is hinged with a clamping link 191. The other end of the clamping link 191 is hinged to the adjusting block 16.

[0034] The lower half of the L-plate 121 is provided with an adjustment threaded hole 15. A guide slider 162 is provided on the outer side of the adjustment block 16. The guide slider 162 is slidably connected in the guide sliding hole 14. An adjustment bolt 161 is rotatably installed on the outer side of the adjustment block 16. The adjustment bolt 161 is threadedly connected in the adjustment threaded hole 15. The top and bottom of the adjustment block 16 are provided with sliding openings 163. A pin 164 is provided inside the sliding opening 163. Pin rollers 171 are provided on both sides of the first clamping plate 17. Several pin holes 172 are circumferentially opened on the outer side of the pin rollers 171. The pin 164 can pass through the pin holes 172. The pin rollers 171 on the two sets of the first clamping plates 17 are slidably connected in the upper and lower sets of sliding openings 163 respectively.

[0035] A connecting plate 18 is provided on the outer side of the adjusting block 16. Both sets of first clamping plates 17 are rotatably mounted on the connecting plate 18. The top spring 165 is fixedly connected to the connecting plate 18. Two sets of gear 181 and two sets of gear 2 182 are rotatably mounted on the outer side of the connecting plate 18. The two sets of gear 181 are fixedly connected to the pin rollers 171 on the two sets of first clamping plates 17 respectively. The two sets of gear 2 182 are located between the two sets of gear 181, and the two sets of gear 181 and the two sets of gear 2 182 mesh with each other on the same vertical line. Through this design, an even number of gears are used so that the two sets of first clamping plates 17 can swing synchronously in opposite directions.

[0036] The end of the first clamping plate 17 away from the adjusting block 16 is designed with an arc, and the outer surface is provided with ball bearings 174. The rotation center of the second clamping plate 19 coincides with the center of the arc.

[0037] The storage groove 173 in the lower first clamping plate 17 is larger than the storage groove 173 in the upper first clamping plate 17. When the upper second clamping plate 19 is pressed tightly into the upper storage groove 173, the two sets of first clamping plates 17 form a V shape.

[0038] The C-type clamping block 12 structure used in this embodiment has low requirements for machining accuracy and is convenient and efficient for position adjustment. The specific operation steps are as follows:

[0039] During installation, the entire device can be assembled first and then mounted on the guide rails. The length of the base plate 11 and the overall length of the L-plate 121 do not need to be too precise; they only need to be slightly larger than the width between the two guide rails of the machine tool. After mounting, rotate the adjusting bolt 161. The adjusting bolt 161 drives the adjusting block 16 to slide in the groove on the outer side of the guide rail. Currently, the grooves on the outer side of the machine tool guide rails are all vertical planes in the middle and sloped at both ends. In the initial state, because the storage swing groove 173 in the lower first clamping plate 17 is larger than the upper first clamping plate 17, the initial state is as follows: The storage slot 173 in 7 has a relatively large weight in the upper first clamping plate 17. When there is no force, it will swing downward, that is, the two sets of first clamping plates 17 swing inward, and the opening decreases. During the swinging process, the second clamping plate 19 swings downward relative to the first clamping plate 17 under the action of the clamping link 191. When the upper second clamping plate 19 is pressed tightly in the upper storage slot 173, the upper second clamping plate 19 cannot swing. At this time, the two sets of first clamping plates 17 cannot swing, forming the initial V-shaped structure.

[0040] Therefore, when the adjusting block 16 slides in the outer groove of the guide rail, the two sets of first clamping plates 17 will first contact the inner wall of the groove. Due to the V-shaped structure, as the adjusting block 16 continues to push inward, the two sets of first clamping plates 17 swing outward simultaneously until the first clamping plate 17 hits the corner. When pressure is applied again, the corner restricts the first clamping plate 17 from continuing to swing, completing the initial positioning. The first clamping plate 17 can restrict the base 1 from moving up and down and left and right, but at this time it can slide back and forth along the guide rail. Therefore, the adjusting block 16 drives the pin 164 to be inserted into the pin hole 172, restricting the swing of the first clamping plate 17. The angle of the first clamping plate 17 is fixed. It should be noted that... It is clear that initially, due to the elasticity of the top spring 165, the first clamping plate 17 swings first and does not slide. Therefore, when the first clamping plate 17 cannot swing, the top spring 165 is compressed. Then, as the adjusting block 16 continues to advance, the adjusting block 16 drives the clamping link 191 to move relative to the second clamping plate 19. The clamping link 191 pushes the second clamping plate 19 to swing upward. The second clamping plate 19 fits against the inclined surface of the groove, and the friction force restricts the base 1 from sliding along the guide rail. Since the rotation center of the second clamping plate 19 coincides with the arc center of the top pressing end of the first clamping plate 17, the second clamping plate 19 can fit tightly against the inclined surface, with a good clamping effect, and can completely fix the device.

[0041] When the position needs to be adjusted later, simply loosen the adjusting bolt 161 slightly to move the second clamping plate 19 away from the guide rail slope. At this time, under the action of the ball bearing 174, the first clamping plate 17 and the guide rail contact surface are in rolling contact. The C-shaped clamping block acts as a slider structure, which can slide stably along the guide rail for quick position adjustment. The adjustment is convenient.

[0042] It should be noted that the device of the present invention can also be used when the machining center is not located at the center of the guide rail. By adjusting the sliding lengths of the adjusting blocks 16 at both ends, the center of the bracket assembly 2 can be adjusted to the machining center, making it more widely applicable. Moreover, by simply setting the initial length of the adjusting blocks 16 to be longer, it can be used for most machine tools on the market.

[0043] In the second embodiment, based on the above embodiment, the C-shaped clamp 12 is configured as a C-shaped fixing block and matches the specifications of the guide rail.

[0044] During installation, the C-shaped clamp 12 is embedded into the recessed cavity on the outside of the guide rail. Then, the two sets of C-shaped clamps 12 are connected together using the base plate 11. Subsequently, the bolts in the clamping threaded holes 13 are screwed down to securely fix the C-shaped clamps 12 on the outside of the guide rail, thus completing the installation of the base 1. Then, the bracket assembly 2 is installed on top of the base 1. Installation is convenient, and disassembly can be performed by reversing the order of operations. Utilizing the extremely high straightness and good parallelism of the machine tool guide rail itself, the horizontal and vertical accuracy of the bracket assembly 2 can be ensured without repeated adjustments, allowing for quick use.

[0045] In this embodiment, the C-type clamp 12 needs to be specially customized according to the specifications of the corresponding guide rail. Although the machining accuracy requirement is high, the structure is simple.

[0046] In embodiment three, based on the above embodiments, the support assembly 2 is further comprising a support part consisting of a support 22 and an upper pressure cover 21. Both the upper pressure cover 21 and the support 22 have through-holes for clamping sliding holes. A lead screw 212 is rotatably mounted inside the clamping sliding hole. Two sets of lead screws 212 are provided inside the support 22, and these two sets of lead screws 212 are circumferentially distributed at equal intervals with the lead screw 212 in the upper pressure cover 21. One end of the lead screw 212 near the center of the support assembly 2 is threadedly connected to a top block 214, and the other end is provided with a lead screw knob 211. The top block 214 is slidably connected in the clamping sliding hole. Locking knobs 222 are threadedly connected to the front of both the upper pressure cover 21 and the support 22. The locking knobs 222 can lock the top block 214. The top block 214 is made of C12MoV alloy tool steel with a hardness of HRC58-62.

[0047] By manually rotating the lead screw knob 211, the lead screw knob 211 drives the lead screw 212 to rotate, and the lead screw 212 controls the feed of the top block 214, thereby clamping the workpiece and adjusting the straightness and coaxiality of the workpiece.

[0048] In embodiment four, based on the above embodiments, a first connecting shaft 215 is provided at the bottom left side of the upper pressure cover 21. The first connecting shaft 215 is rotatably mounted on the top left side of the bracket 22. A second connecting shaft 221 is rotatably mounted on the top right side of the bracket 22. A screw is provided at the top of the second connecting shaft 221. A clamping nut 223 is threadedly connected to the top of the screw. A locking groove is provided at the bottom right side of the upper pressure cover 21. After the screw swings into the locking groove, the clamping nut 223 is screwed down to press the upper pressure cover 21 onto the bracket 22.

[0049] With this design, after loosening the clamping nut 223, the upper pressure cover 21 can be opened quickly, enabling rapid material unloading.

[0050] Example 5, based on the above examples, further includes screws 213 threadedly connected to the outer side of the clamping sliding hole, and an annular groove opened on the lead screw 212 corresponding to the position of the screw 213. With this design, the lead screw 212 can be disassembled by unscrewing the screw 213.

[0051] Example 6, based on the above examples, further includes a drive shaft hole through the outer side of the lead screw 212. With this design, a shaft of the corresponding size can be inserted through the drive shaft hole as a drive handle, which makes it easier to clamp the workpiece.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A special center support device for deep hole drilling machine for small hole machining, comprising a base (1), characterized in that, The base (1) consists of a base plate (11) and two sets of C-shaped clamping blocks (12). The two sets of C-shaped clamping blocks (12) are fixedly installed at both ends of the bottom of the base plate (11) by bolts. The top of the C-shaped clamping blocks (12) is provided with clamping threaded holes (13). The C-shaped clamping blocks (12) can be fixedly installed on the outside of the machine tool guide rail by bolts screwed into the clamping threaded holes (13). The top of the base plate (11) is fixedly installed with a bracket assembly (2) by bolts. The C-shaped clamp (12) consists of an L-plate (121), an adjusting block (16), two sets of first clamping plates (17), and two sets of second clamping plates (19). The L-plate (121) is fixedly installed at the bottom of the base plate (11). The lower half of the L-plate (121) is provided with a guide sliding hole (14). The adjusting block (16) can slide along the guide sliding hole (14). The top and bottom of the adjusting block (16) are provided with sliding openings (163). The first clamping plates (17) can slide along the sliding openings (163) and can be locked. In the sliding opening (163), the two sets of first clamping plates (17) can swing in opposite directions synchronously. A top spring (165) is provided between the two sets of first clamping plates (17) and the adjusting block (16). A storage swing groove (173) is opened at the end of the first clamping plate (17) away from the adjusting block (16). The second clamping plate (19) is rotatably installed in the storage swing groove (173). A clamping link (191) is hinged to the side of the second clamping plate (19) near the adjusting block (16). The other end of the clamping link (191) is hinged to the adjusting block (16).

2. The center rest device for deep hole drilling machines for small hole machining according to claim 1, characterized in that, The C-shaped clamp (12) is configured as a C-shaped fixing block and is matched with the guide rail specifications.

3. A special center rest device for deep hole drilling machines for small hole machining according to claim 2, characterized in that, The bracket assembly (2) consists of a bracket (22) and an upper cover (21) forming a support part. The upper cover (21) and the bracket (22) are both provided with clamping sliding holes. A lead screw (212) is rotatably installed inside the clamping sliding hole. Two sets of lead screws (212) are provided inside the bracket (22), and the two sets of lead screws (212) and the lead screws (212) in the upper cover (21) are circumferentially distributed at equal intervals. One end of the lead screw (212) near the center of the bracket assembly (2) is threadedly connected to a top block (214), and the other end is provided with a lead screw knob (211). The top block (214) is slidably connected in the clamping sliding hole. The upper cover (21) and the front of the bracket (22) are both threadedly connected to a locking knob (222). The locking knob (222) can lock the top block (214). The top block (214) is made of C12MoV alloy tool steel with a hardness of HRC58-62.

4. A special center rest device for deep hole drilling machines for small hole machining according to claim 3, characterized in that, The bottom left side of the upper cover (21) is provided with a first connecting shaft (215), which is rotatably mounted on the top left side of the bracket (22). The top right side of the bracket (22) is rotatably mounted with a second connecting shaft (221). The top of the second connecting shaft (221) is provided with a screw, and the top of the screw is threadedly connected with a clamping nut (223). The bottom right side of the upper cover (21) is provided with a locking groove. After the screw swings into the locking groove, the clamping nut (223) is screwed down to press the upper cover (21) onto the bracket (22).

5. A center rest device for deep hole drilling machines for small hole machining according to claim 4, characterized in that, The outer side of each clamping sliding hole is threaded with a screw (213), and the lead screw (212) has an annular groove at the position corresponding to the screw (213).

6. A center rest device for deep hole drilling machines for small hole machining according to claim 5, characterized in that, The lead screw (212) has a drive shaft hole through its outer side.

7. A center rest device for deep hole drilling machines for small hole machining according to claim 1, characterized in that, The lower half of the L plate (121) is provided with an adjustment threaded hole (15). The outer side of the adjustment block (16) is provided with a guide slider (162), which is slidably connected in the guide sliding hole (14). The outer side of the adjustment block (16) is rotatably installed with an adjustment bolt (161), which is threadedly connected in the adjustment threaded hole (15). The inside of the sliding mouth (163) is provided with a pin (164). Both sides of the first clamping plate (17) are provided with pin rollers (171). The outer side of the pin rollers (171) is provided with several pin holes (172) that are circumferentially opened. The pin rods (164) can pass through the pin holes (172). The pin rollers (171) on the two sets of the first clamping plates (17) are slidably connected in the upper and lower sets of sliding mouths (163).

8. A center rest device for deep hole drilling machines for small hole machining according to claim 7, characterized in that, A connecting plate (18) is provided on the outer side of the adjusting block (16). Both sets of first clamping plates (17) are rotatably mounted on the connecting plate (18). The top spring (165) is fixedly connected to the connecting plate (18). Two sets of gear one (181) and two sets of gear two (182) are rotatably mounted on the outer side of the connecting plate (18). The two sets of gear one (181) are fixedly connected to the pin rollers (171) on the two sets of first clamping plates (17). The two sets of gear two (182) are arranged between the two sets of gear one (181), and the two sets of gear one (181) and the two sets of gear two (182) mesh with each other on the same vertical line.

9. A special center rest device for deep hole drilling machines for small hole machining according to claim 8, characterized in that, The first clamping plate (17) has an arc design at the end away from the adjusting block (16), and the outer surface is provided with ball bearings (174). The rotation center of the second clamping plate (19) coincides with the center of the arc.

10. A center rest device for deep hole drilling machines for small hole machining according to claim 9, characterized in that, The storage slot (173) in the lower first clamping plate (17) is larger than the storage slot (173) in the upper first clamping plate (17). When the upper second clamping plate (19) is pressed tightly into the upper storage slot (173), the two sets of first clamping plates (17) form a V shape.

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